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6451328782
yap-6.3/library/dialect/swi/os/pl-file.c
Vitor Santos Costa 5f96c07131 debugg
2018-06-30 14:33:32 +01:00

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125 KiB
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/* Part of SWI-Prolog
Author: Jan Wielemaker
E-mail: J.Wielemaker@cs.vu.nl
WWW: http://www.swi-prolog.org
Copyright (C): 1985-2012, University of Amsterdam
VU University Amsterdam
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/** @ingroup InputOutput
@{
*/
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
This module is far too big. It defines a layer around open(), etc. to
get opening and closing of files to the symbolic level required for
Prolog. It also defines basic I/O predicates, stream based I/O and
finally a bundle of operations on files, such as name expansion,
renaming, deleting, etc. Most of this module is rather straightforward.
If time is there I will have a look at all this to clean it. Notably
handling times must be cleaned, but that not only holds for this module.
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
/*#define O_DEBUG 1*/
/*#define O_DEBUG_MT 1*/
#define NEEDS_SWINSOCK
#include "pl-incl.h"
#include "pl-ctype.h"
#include "pl-utf8.h"
#include <errno.h>
#include <stdlib.h>
#ifdef HAVE_SYS_SELECT_H
#include <sys/select.h>
#endif
#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#endif
#ifdef HAVE_SYS_PARAM_H
#include <sys/param.h>
#endif
#ifdef HAVE_SYS_FILE_H
#include <sys/file.h>
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#include <fcntl.h>
#endif
#ifdef HAVE_BSTRING_H
#include <bstring.h>
#endif
#if HAVE_ALLOCA_H
#include <alloca.h>
#endif
#define LOCK() PL_LOCK(L_FILE) /* MT locking */
#define UNLOCK() PL_UNLOCK(L_FILE)
#undef LD /* fetch LD once per function */
#define LD LOCAL_LD
/* there are two types of stream property functions. In the usual case,
they have an argument, but in a few cases they don't */
typedef int (*property0_t)(IOSTREAM *s ARG_LD);
typedef int (*property_t)(IOSTREAM *s, term_t prop ARG_LD);
static int bad_encoding(const char *msg, atom_t name);
static int noprotocol(void);
static PL_blob_t stream_blob;
const atom_t standardStreams[] =
{ ATOM_user_input, /* 0 */
ATOM_user_output, /* 1 */
ATOM_user_error, /* 2 */
ATOM_current_input, /* 3 */
ATOM_current_output, /* 4 */
ATOM_protocol, /* 5 */
NULL_ATOM
};
static int
standardStreamIndexFromName(atom_t name)
{ const atom_t *ap;
for(ap=standardStreams; *ap; ap++)
{ if ( *ap == name )
return (int)(ap - standardStreams);
}
return -1;
}
static int
standardStreamIndexFromStream(IOSTREAM *s)
{ GET_LD
IOSTREAM **sp = LD->IO.streams;
int i = 0;
for( ; i<6; i++, sp++ )
{ if ( *sp == s )
return i;
}
return -1;
}
/*******************************
* BOOKKEEPING *
*******************************/
/**
* @defgroup StreamM Stream Manipulation
* @ingroup InputOutput
* @{
*/
static void aliasStream(IOSTREAM *s, atom_t alias);
static void unaliasStream(IOSTREAM *s, atom_t name);
static Table streamAliases; /* alias --> stream */
static Table streamContext; /* stream --> extra data */
typedef struct _alias
{ struct _alias *next;
atom_t name;
} alias;
#define IO_TELL 0x001 /* opened by tell/1 */
#define IO_SEE 0x002 /* opened by see/1 */
typedef struct
{ alias *alias_head;
alias *alias_tail;
atom_t filename; /* associated filename */
unsigned flags;
} stream_context;
static stream_context *
getStreamContext(IOSTREAM *s)
{ if ( !s->context )
{ stream_context *ctx = allocHeapOrHalt(sizeof(*ctx));
DEBUG(1, Sdprintf("Created ctx=%p for stream %p\n", ctx, s));
ctx->alias_head = ctx->alias_tail = NULL;
ctx->filename = NULL_ATOM;
ctx->flags = 0;
addHTable(streamContext, s, ctx);
s->context = ctx;
}
return (stream_context*)s->context;
}
static stream_context *
getExistingStreamContext(IOSTREAM *s)
{ return (stream_context*)s->context;
}
/* MT: Must be called locked */
static void
aliasStream(IOSTREAM *s, atom_t name)
{ stream_context *ctx;
Symbol symb;
alias *a;
/* ensure name is free (error?) */
if ( (symb = lookupHTable(streamAliases, (void *)name)) )
unaliasStream(symb->value, name);
ctx = getStreamContext(s);
addHTable(streamAliases, (void *)name, s);
PL_register_atom(name);
a = allocHeapOrHalt(sizeof(*a));
a->next = NULL;
a->name = name;
if ( ctx->alias_tail )
{ ctx->alias_tail->next = a;
ctx->alias_tail = a;
} else
{ ctx->alias_head = ctx->alias_tail = a;
}
}
/* MT: Locked by freeStream()
*/
static void
unaliasStream(IOSTREAM *s, atom_t name)
{ Symbol symb;
if ( name )
{ if ( (symb = lookupHTable(streamAliases, (void *)name)) )
{ stream_context *ctx;
deleteSymbolHTable(streamAliases, symb);
if ( (ctx=getExistingStreamContext(s)) )
{ alias **a;
for(a = &ctx->alias_head; *a; a = &(*a)->next)
{ if ( (*a)->name == name )
{ alias *tmp = *a;
*a = tmp->next;
freeHeap(tmp, sizeof(*tmp));
if ( tmp == ctx->alias_tail )
ctx->alias_tail = NULL;
break;
}
}
}
PL_unregister_atom(name);
}
} else /* delete them all */
{ stream_context *ctx;
if ( (ctx=getExistingStreamContext(s)) )
{ alias *a, *n;
for(a = ctx->alias_head; a; a=n)
{ Symbol s2;
n = a->next;
if ( (s2 = lookupHTable(streamAliases, (void *)a->name)) )
{ deleteSymbolHTable(streamAliases, s2);
PL_unregister_atom(a->name);
}
freeHeap(a, sizeof(*a));
}
ctx->alias_head = ctx->alias_tail = NULL;
}
}
}
static void
freeStream(IOSTREAM *s)
{ GET_LD
Symbol symb;
int i;
IOSTREAM **sp;
DEBUG(1, Sdprintf("freeStream(%p)\n", s));
LOCK();
unaliasStream(s, NULL_ATOM);
if ( (symb=lookupHTable(streamContext, s)) )
{ stream_context *ctx = symb->value;
if ( ctx->filename != NULL_ATOM )
{ PL_unregister_atom(ctx->filename);
if ( ctx->filename == source_file_name )
{ source_file_name = NULL_ATOM; /* TBD: pop? */
source_line_no = -1;
}
}
freeHeap(ctx, sizeof(*ctx));
deleteSymbolHTable(streamContext, symb);
}
/* if we are a standard stream */
/* reassociate with standard I/O */
/* NOTE: there may be more! */
for(i=0, sp = LD->IO.streams; i<6; i++, sp++)
{ if ( *sp == s )
{ if ( s->flags & SIO_INPUT )
*sp = Sinput;
else if ( sp == &Suser_error )
*sp = Serror;
else if ( sp == &Sprotocol )
*sp = NULL;
else
*sp = Soutput;
}
}
UNLOCK();
}
/* MT: locked by caller (openStream()) */
/* name must be registered by the caller */
static void
setFileNameStream_unlocked(IOSTREAM *s, atom_t name)
{ stream_context *ctx = getStreamContext(s);
if ( ctx->filename )
{ PL_unregister_atom(ctx->filename);
ctx->filename = NULL_ATOM;
}
if ( !(name == NULL_ATOM || name == ATOM_) )
ctx->filename = name;
}
int
setFileNameStream(IOSTREAM *s, atom_t name)
{ LOCK();
setFileNameStream_unlocked(s, name);
PL_register_atom(name);
UNLOCK();
return TRUE;
}
atom_t
fileNameStream(IOSTREAM *s)
{ atom_t name;
LOCK();
name = getStreamContext(s)->filename;
UNLOCK();
return name;
}
#if __YAP_PROLOG__
static void init_yap(void);
#endif
void
initIO(void)
{ GET_LD
const atom_t *np;
int i;
streamAliases = newHTable(16);
streamContext = newHTable(16);
PL_register_blob_type(&stream_blob);
if ( False(Sinput, SIO_ISATTY) ||
False(Soutput, SIO_ISATTY) )
{ /* clear PLFLAG_TTY_CONTROL */
PL_set_prolog_flag("tty_control", PL_BOOL, FALSE);
}
ResetTty();
#if __YAP_PROLOG__
/* needs to be done after tty hacking */
init_yap();
#endif
Sclosehook(freeStream);
Sinput->position = &Sinput->posbuf; /* position logging */
Soutput->position = &Sinput->posbuf;
Serror->position = &Sinput->posbuf;
ttymode = TTY_COOKED;
PushTty(Sinput, &ttytab, TTY_SAVE);
LD->prompt.current = ATOM_prompt;
PL_register_atom(ATOM_prompt);
Suser_input = Sinput;
Suser_output = Soutput;
Suser_error = Serror;
Scurin = Sinput; /* see/tell */
Scurout = Soutput;
Sprotocol = NULL; /* protocolling */
getStreamContext(Sinput); /* add for enumeration */
getStreamContext(Soutput);
getStreamContext(Serror);
for( i=0, np = standardStreams; *np; np++, i++ )
addHTable(streamAliases, (void *)*np, (void *)(intptr_t)i);
GD->io_initialised = TRUE;
}
/*******************************
* GET HANDLES *
*******************************/
#ifdef O_PLMT
static inline IOSTREAM *
getStream(IOSTREAM *s)
{ if ( s && s->magic == SIO_MAGIC && Slock(s) == 0 )
{ if ( unlikely(s->magic == SIO_CMAGIC) )
{ Sunlock(s);
return NULL;
}
return s;
}
return NULL;
}
static inline IOSTREAM *
tryGetStream(IOSTREAM *s)
{ if ( s && s->magic == SIO_MAGIC && StryLock(s) == 0 )
{ if ( unlikely(s->magic == SIO_CMAGIC) )
{ Sunlock(s);
return NULL;
}
return s;
}
return NULL;
}
static inline void
releaseStream(IOSTREAM *s)
{ if ( s->magic == SIO_MAGIC )
Sunlock(s);
}
#else /*O_PLMT*/
#define getStream(s) (s)
#define tryGetStream(s) (s)
#define releaseStream(s)
#endif /*O_PLMT*/
int
PL_release_stream(IOSTREAM *s)
{ if ( Sferror(s) )
return streamStatus(s);
releaseStream(s);
return TRUE;
}
/*******************************
* ERRORS *
*******************************/
static int symbol_no_stream(atom_t symbol);
static int
no_stream(term_t t, atom_t name)
{ if ( t )
return PL_error(NULL, 0, NULL, ERR_EXISTENCE, ATOM_stream, t);
else
return symbol_no_stream(name);
}
static int
not_a_stream(term_t t)
{ return PL_error(NULL, 0, NULL, ERR_DOMAIN, ATOM_stream_or_alias, t);
}
static int
symbol_no_stream(atom_t symbol)
{ GET_LD
term_t t;
if ( (t = PL_new_term_ref()) )
{ PL_put_atom(t, symbol);
return no_stream(t, 0);
} else
return FALSE;
}
static int
symbol_not_a_stream(atom_t symbol)
{ GET_LD
term_t t = PL_new_term_ref();
PL_put_atom(t, symbol);
return not_a_stream(t);
}
/*******************************
* PROLOG HANDLES *
*******************************/
typedef struct stream_ref
{ IOSTREAM *read;
IOSTREAM *write;
} stream_ref;
static int
write_stream_ref(IOSTREAM *s, atom_t aref, int flags)
{ stream_ref *ref = PL_blob_data(aref, NULL, NULL);
(void)flags;
if ( ref->read && ref->write )
Sfprintf(s, "<stream>(%p,%p)", ref->read, ref->write);
else if ( ref->read )
Sfprintf(s, "<stream>(%p)", ref->read);
else
Sfprintf(s, "<stream>(%p)", ref->write);
return TRUE;
}
static void
acquire_stream_ref(atom_t aref)
{ stream_ref *ref = PL_blob_data(aref, NULL, NULL);
if ( ref->read )
ref->read->references++;
if ( ref->write )
ref->write->references++;
}
static int
release_stream_ref(atom_t aref)
{ stream_ref *ref = PL_blob_data(aref, NULL, NULL);
if ( ref->read )
{ if ( --ref->read->references == 0 && ref->read->erased )
unallocStream(ref->read);
}
if ( ref->write )
{ if ( --ref->write->references == 0 && ref->write->erased )
unallocStream(ref->write);
}
return TRUE;
}
static int
save_stream_ref(atom_t aref, IOSTREAM *fd)
{ stream_ref *ref = PL_blob_data(aref, NULL, NULL);
(void)fd;
return PL_warning("Cannot save reference to <stream>(%p,%p)",
ref->read, ref->write);
}
static atom_t
load_stream_ref(IOSTREAM *fd)
{ (void)fd;
return PL_new_atom("<saved-stream-ref>");
}
static PL_blob_t stream_blob =
{ PL_BLOB_MAGIC,
PL_BLOB_UNIQUE,
"stream",
release_stream_ref,
NULL,
write_stream_ref,
acquire_stream_ref,
save_stream_ref,
load_stream_ref
};
#define SH_ERRORS 0x01 /* generate errors */
#define SH_ALIAS 0x02 /* allow alias */
#define SH_UNLOCKED 0x04 /* don't lock the stream */
#define SH_OUTPUT 0x08 /* We want an output stream */
#define SH_INPUT 0x10 /* We want an input stream */
static int
get_stream_handle__LD(atom_t a, IOSTREAM **sp, int flags ARG_LD)
{ stream_ref *ref;
PL_blob_t *type;
IOSTREAM *s;
ref = PL_blob_data(a, NULL, &type);
if ( type == &stream_blob )
{ if ( ref->read )
{ if ( ref->write && (flags&SH_OUTPUT) )
s = ref->write;
else
s = ref->read;
} else
s = ref->write;
if ( s->erased )
goto noent;
if ( flags & SH_UNLOCKED )
{ assert( s->magic == SIO_MAGIC || s->magic == SIO_CMAGIC );
*sp = s;
return TRUE;
} else if ( (s=getStream(s)) )
{ *sp = s;
return TRUE;
}
return symbol_no_stream(a);
} else
{ Symbol symb;
if ( !(flags & SH_UNLOCKED) )
LOCK();
if ( (symb=lookupHTable(streamAliases, (void *)a)) )
{ IOSTREAM *stream;
uintptr_t n = (uintptr_t)symb->value;
if ( n < 6 ) /* standard stream! */
{ stream = LD->IO.streams[n]; /* TBD: No need to lock for std-streams */
} else
stream = symb->value;
if ( !(flags & SH_UNLOCKED) )
UNLOCK();
if ( stream )
{ if ( (flags & SH_UNLOCKED) )
{ if ( stream->magic == SIO_MAGIC )
{ *sp = stream;
return TRUE;
}
} else if ( (*sp = getStream(stream)) )
return TRUE;
goto noent;
}
}
if ( !(flags & SH_UNLOCKED) )
UNLOCK();
goto noent;
}
if ( flags & SH_ERRORS )
symbol_not_a_stream(a);
return FALSE;
noent:
if ( flags & SH_ERRORS )
symbol_no_stream(a);
return FALSE;
}
#define get_stream_handle(t, sp, flags) \
get_stream_handle__LD(t, sp, flags PASS_LD)
static int
term_stream_handle(term_t t, IOSTREAM **s, int flags ARG_LD)
{ atom_t a;
if ( !PL_get_atom(t, &a) )
return not_a_stream(t);
return get_stream_handle(a, s, flags);
}
int
PL_get_stream_handle(term_t t, IOSTREAM **s)
{ GET_LD
return term_stream_handle(t, s, SH_ERRORS|SH_ALIAS PASS_LD);
}
static int
unify_stream_ref(term_t t, IOSTREAM *s)
{ GET_LD
stream_ref ref;
int rval;
memset(&ref, 0, sizeof(ref));
if ( s->flags & SIO_INPUT )
ref.read = s;
else
ref.write = s;
rval = PL_unify_blob(t, &ref, sizeof(ref), &stream_blob);
if ( !rval && !PL_is_variable(t) )
return PL_error(NULL, 0, "stream-argument", ERR_UNINSTANTIATION, 0, t);
return rval;
}
int
PL_unify_stream_or_alias(term_t t, IOSTREAM *s)
{ GET_LD
int rval;
stream_context *ctx;
int i;
if ( (i=standardStreamIndexFromStream(s)) >= 0 && i < 3 )
return PL_unify_atom(t, standardStreams[i]);
LOCK();
ctx = getStreamContext(s);
if ( ctx->alias_head )
rval = PL_unify_atom(t, ctx->alias_head->name);
else
rval = unify_stream_ref(t, s);
UNLOCK();
return rval;
}
int
PL_unify_stream(term_t t, IOSTREAM *s)
{ LOCK();
(void)getStreamContext(s); /* get stream known to Prolog */
UNLOCK();
return unify_stream_ref(t, s);
}
IOSTREAM ** /* provide access to Suser_input, */
_PL_streams(void) /* Suser_output and Suser_error */
{ GET_LD
return &Suser_input;
}
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
getInputStream(term_t t, IOSTREAM **s)
getOutputStream(term_t t, IOSTREAM **s)
These functions are the basis used by all Prolog predicates to get
a input or output stream handle. If t = 0, current input/output is
returned. This allows us to define the standard-stream based version
simply by calling the explicit stream-based version with 0 for the
stream argument.
MT: The returned stream is always locked and should be returned
using releaseStream() or streamStatus().
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
typedef enum
{ S_DONTCARE = 0,
S_TEXT,
S_BINARY
} s_type;
static int
checkStreamType(s_type text, IOSTREAM *s, atom_t *error ARG_LD)
{ if ( text == S_DONTCARE || LD->IO.stream_type_check == ST_FALSE )
return TRUE; /* no checking */
/* ok? */
if ( text == S_TEXT && (s->flags&SIO_TEXT) )
return TRUE;
if ( text == S_BINARY && !(s->flags&SIO_TEXT) )
return TRUE;
/* no */
if ( LD->IO.stream_type_check == ST_LOOSE )
{ if ( text == S_TEXT )
return TRUE;
if ( s->encoding == ENC_ISO_LATIN_1 ||
s->encoding == ENC_OCTET )
return TRUE;
}
*error = (text == S_TEXT ? ATOM_binary_stream : ATOM_text_stream);
return FALSE;
}
static int
getOutputStream__LD(term_t t, s_type text, IOSTREAM **stream ARG_LD)
{ atom_t a;
IOSTREAM *s;
atom_t tp;
if ( t == 0 )
{ if ( (s = getStream(Scurout)) )
goto ok;
return no_stream(t, ATOM_current_output);
}
if ( !PL_get_atom(t, &a) )
return not_a_stream(t);
if ( a == ATOM_user )
{ if ( (s = getStream(Suser_output)) )
goto ok;
return no_stream(t, ATOM_user);
}
if ( !get_stream_handle(a, &s, SH_ERRORS|SH_ALIAS|SH_OUTPUT) )
return FALSE;
ok:
if ( !(s->flags&SIO_OUTPUT) )
{ tp = ATOM_stream;
} else if ( checkStreamType(text, s, &tp PASS_LD) )
{ *stream = s;
return TRUE;
}
releaseStream(s);
if ( t == 0 )
{ if ( (t = PL_new_term_ref()) )
PL_put_atom(t, ATOM_current_output);
else
return FALSE; /* resource error */
}
return PL_error(NULL, 0, NULL, ERR_PERMISSION,
ATOM_output, tp, t);
}
int
getTextOutputStream__LD(term_t t, IOSTREAM **stream ARG_LD)
{ return getOutputStream(t, S_TEXT, stream);
}
int
getBinaryOutputStream__LD(term_t t, IOSTREAM **stream ARG_LD)
{ return getOutputStream(t, S_BINARY, stream);
}
static int
getInputStream__LD(term_t t, s_type text, IOSTREAM **stream ARG_LD)
{ atom_t a;
IOSTREAM *s;
atom_t tp;
if ( t == 0 )
{ if ( (s = getStream(Scurin)) )
goto ok;
return no_stream(t, ATOM_current_input);
}
if ( !PL_get_atom(t, &a) )
return not_a_stream(t);
if ( a == ATOM_user )
{ if ( (s = getStream(Suser_input)) )
goto ok;
return no_stream(t, ATOM_user);
}
if ( !get_stream_handle(a, &s, SH_ERRORS|SH_ALIAS|SH_INPUT) )
return FALSE;
ok:
if ( !(s->flags&SIO_INPUT) )
{ tp = ATOM_stream;
} else if ( checkStreamType(text, s, &tp PASS_LD) )
{ *stream = s;
return TRUE;
}
releaseStream(s);
if ( t == 0 )
{ if ( (t = PL_new_term_ref()) )
PL_put_atom(t, ATOM_current_input);
else
return FALSE; /* resource error */
}
return PL_error(NULL, 0, NULL, ERR_PERMISSION,
ATOM_input, tp, t);
}
int
getTextInputStream__LD(term_t t, IOSTREAM **stream ARG_LD)
{ return getInputStream__LD(t, S_TEXT, stream PASS_LD);
}
int
getBinaryInputStream__LD(term_t t, IOSTREAM **stream ARG_LD)
{ return getInputStream__LD(t, S_BINARY, stream PASS_LD);
}
/** stream_pairs(-Pair, +Read, +Write)
* stream_pairs(+Pair, -Read, -Write)
*
* This SWI Built-in can be used in two ways: if the second argument is an input stream
* and the third sn output stresm, Prolog createes a new _Pair_. A stream pair can be
* used in any operation, with the Prolog chosing the appropriate stream to the operation.
*
* If _Pair_ is bound, the predicate can be used to access the two streams in the pair.
*/
static
PRED_IMPL("stream_pair", 3, stream_pair, 0)
{ PRED_LD
IOSTREAM *in = NULL, *out = NULL;
int rc = FALSE;
if ( !PL_is_variable(A1) )
{ stream_ref *ref;
atom_t a;
PL_blob_t *type;
if ( !PL_get_atom(A1, &a) ||
!(ref=PL_blob_data(a, NULL, &type)) ||
type != &stream_blob ||
!ref->read ||
!ref->write )
return PL_error(NULL, 0, NULL, ERR_TYPE, ATOM_stream_pair, A1);
return ( PL_unify_stream_or_alias(A2, ref->read) &&
PL_unify_stream_or_alias(A3, ref->write) );
}
if ( getInputStream(A2, S_DONTCARE, &in) &&
getOutputStream(A3, S_DONTCARE, &out) )
{ stream_ref ref;
ref.read = in;
ref.write = out;
rc = PL_unify_blob(A1, &ref, sizeof(ref), &stream_blob);
}
if ( in )
releaseStream(in);
if ( out )
releaseStream(out);
return rc;
}
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
In windows GUI applications, the IO-streams are not bound. We do not
wish to generate an error on the stream errors that may be caused by
this. It is a bit of a hack, but the alternative is to define a stream
that ignores the error. This might get hairy if the user is playing with
these streams too.
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
#ifdef __WINDOWS__
static int
isConsoleStream(IOSTREAM *s)
{ int i = standardStreamIndexFromStream(s);
return i >= 1 && i < 3; /* only output streams */
}
#else
#define isConsoleStream(s) FALSE
#endif
int
reportStreamError(IOSTREAM *s)
{ if ( GD->cleaning == CLN_NORMAL &&
!isConsoleStream(s) &&
(s->flags & (SIO_FERR|SIO_WARN)) )
{ GET_LD
atom_t op;
term_t stream = PL_new_term_ref();
char *msg;
PL_unify_stream_or_alias(stream, s);
if ( (s->flags & SIO_FERR) )
{ if ( s->exception )
{ fid_t fid;
term_t ex;
int rc;
LD->exception.processing = TRUE; /* allow using spare stack */
if ( !(fid = PL_open_foreign_frame()) )
return FALSE;
ex = PL_new_term_ref();
rc = PL_recorded(s->exception, ex);
PL_erase(s->exception);
s->exception = NULL;
if ( rc )
rc = PL_raise_exception(ex);
PL_close_foreign_frame(fid);
return rc;
}
if ( s->flags & SIO_INPUT )
{ if ( Sfpasteof(s) )
{ return PL_error(NULL, 0, NULL, ERR_PERMISSION,
ATOM_input, ATOM_past_end_of_stream, stream);
} else if ( (s->flags & SIO_TIMEOUT) )
{ PL_error(NULL, 0, NULL, ERR_TIMEOUT,
ATOM_read, stream);
Sclearerr(s);
return FALSE;
} else
op = ATOM_read;
} else
{ if ( (s->flags & SIO_TIMEOUT) )
{ PL_error(NULL, 0, NULL, ERR_TIMEOUT,
ATOM_write, stream);
return FALSE;
} else
op = ATOM_write;
}
if ( s->message )
{ msg = s->message;
} else
{ msg = MSG_ERRNO;
if ( s->io_errno )
errno = s->io_errno;
}
PL_error(NULL, 0, msg, ERR_STREAM_OP, op, stream);
if ( (s->flags & SIO_CLEARERR) )
Sseterr(s, SIO_FERR, NULL);
return FALSE;
} else
{ printMessage(ATOM_warning,
PL_FUNCTOR_CHARS, "io_warning", 2,
PL_TERM, stream,
PL_CHARS, s->message);
Sseterr(s, SIO_WARN, NULL);
}
}
return TRUE;
}
int
streamStatus(IOSTREAM *s)
{ if ( (s->flags & (SIO_FERR|SIO_WARN)) )
{ int ret = reportStreamError(s);
releaseStream(s);
return ret;
}
releaseStream(s);
return TRUE;
}
/*******************************
* TTY MODES *
*******************************/
ttybuf ttytab; /* saved terminal status on entry */
int ttymode; /* Current tty mode */
typedef struct input_context * InputContext;
typedef struct output_context * OutputContext;
struct input_context
{ IOSTREAM * stream; /* pushed input */
atom_t type; /* Type of input */
atom_t term_file; /* old term_position file */
int term_line; /* old term_position line */
InputContext previous; /* previous context */
};
struct output_context
{ IOSTREAM * stream; /* pushed output */
OutputContext previous; /* previous context */
};
#define input_context_stack (LD->IO.input_stack)
#define output_context_stack (LD->IO.output_stack)
static IOSTREAM *openStream(term_t file, term_t mode, term_t options);
void
dieIO()
{ if ( GD->io_initialised )
{ noprotocol();
closeFiles(TRUE);
PopTty(Sinput, &ttytab, TRUE);
}
}
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
closeStream() performs Prolog-level closing. Most important right now is
to to avoid closing the user-streams. If a stream cannot be flushed (due
to a write-error), an exception is generated.
MT: We assume the stream is locked and will unlock it here.
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
static int
closeStream(IOSTREAM *s)
{ if ( s == Sinput )
{ Sclearerr(s);
releaseStream(s);
} else if ( s == Soutput || s == Serror )
{ if ( Sflush(s) < 0 )
return streamStatus(s);
releaseStream(s);
} else
{ if ( !Sferror(s) && Sflush(s) < 0 )
{ streamStatus(s);
Sclose(s);
return FALSE;
}
if ( Sclose(s) < 0 ) /* will unlock as well */
return FALSE;
}
return TRUE;
}
void
closeFiles(int all)
{ GET_LD
TableEnum e;
Symbol symb;
e = newTableEnum(streamContext);
while( (symb=advanceTableEnum(e)) )
{ IOSTREAM *s = symb->name;
if ( all || !(s->flags & SIO_NOCLOSE) )
{ IOSTREAM *s2 = tryGetStream(s);
if ( s2 )
{ if ( !all )
{ term_t t = PL_new_term_ref();
PL_unify_stream_or_alias(t, s2);
printMessage(ATOM_informational,
PL_FUNCTOR, FUNCTOR_close_on_abort1,
PL_TERM, t);
PL_reset_term_refs(t);
}
closeStream(s2);
}
}
}
freeTableEnum(e);
}
void
protocol(const char *str, size_t n)
{ GET_LD
IOSTREAM *s;
if ( LD && Sprotocol && (s = getStream(Sprotocol)) )
{ while( n-- > 0 )
Sputcode(*str++&0xff, s);
Sflush(s);
releaseStream(s); /* we don not check errors */
}
}
/*******************************
* TEMPORARY I/O *
*******************************/
int
push_input_context(atom_t type)
{ GET_LD
InputContext c = allocHeapOrHalt(sizeof(struct input_context));
PL_register_atom(type);
c->stream = Scurin;
c->type = type;
c->term_file = source_file_name;
c->term_line = source_line_no;
c->previous = input_context_stack;
input_context_stack = c;
return TRUE;
}
int
pop_input_context(void)
{ GET_LD
InputContext c = input_context_stack;
if ( c )
{ Scurin = c->stream;
source_file_name = c->term_file;
source_line_no = c->term_line;
input_context_stack = c->previous;
PL_unregister_atom(c->type);
freeHeap(c, sizeof(struct input_context));
return TRUE;
} else
{ Scurin = Sinput;
return FALSE;
}
}
static
PRED_IMPL("$push_input_context", 1, push_input_context, 0)
{ PRED_LD
atom_t type;
if ( PL_get_atom_ex(A1, &type) )
return push_input_context(type);
return FALSE;
}
static
PRED_IMPL("$pop_input_context", 0, pop_input_context, 0)
{ return pop_input_context();
}
/** '$input_context'(-List) is det.
True if List is a list of input(Type,File,Line) terms describing the
current input context.
*/
static
PRED_IMPL("$input_context", 1, input_context, 0)
{ PRED_LD
term_t tail = PL_copy_term_ref(A1);
term_t head = PL_new_term_ref();
term_t stream = PL_new_term_ref();
InputContext c = input_context_stack;
for(c=input_context_stack; c; c=c->previous)
{ atom_t file = c->term_file ? c->term_file : ATOM_minus;
int line = c->term_file ? c->term_line : 0;
PL_put_variable(stream);
if ( !PL_unify_stream_or_alias(stream, c->stream) ||
!PL_unify_list(tail, head, tail) ||
!PL_unify_term(head, PL_FUNCTOR, FUNCTOR_input4,
PL_ATOM, c->type,
PL_ATOM, file,
PL_INT, line,
PL_TERM, stream) )
return FALSE;
}
return PL_unify_nil(tail);
}
void
pushOutputContext(void)
{ GET_LD
OutputContext c = allocHeapOrHalt(sizeof(struct output_context));
c->stream = Scurout;
c->previous = output_context_stack;
output_context_stack = c;
}
void
popOutputContext(void)
{ GET_LD
OutputContext c = output_context_stack;
if ( c )
{ if ( c->stream->magic == SIO_MAGIC )
Scurout = c->stream;
else
{ Sdprintf("Oops, current stream closed?");
Scurout = Soutput;
}
output_context_stack = c->previous;
freeHeap(c, sizeof(struct output_context));
} else
Scurout = Soutput;
}
int
setupOutputRedirect(term_t to, redir_context *ctx, int redir)
{ GET_LD
atom_t a;
ctx->term = to;
ctx->redirected = redir;
if ( to == 0 )
{ if ( !(ctx->stream = getStream(Scurout)) )
return no_stream(to, ATOM_current_output);
ctx->is_stream = TRUE;
} else if ( PL_get_atom(to, &a) )
{ if ( a == ATOM_user )
{ if ( !(ctx->stream = getStream(Suser_output)) )
return no_stream(to, ATOM_user);
ctx->is_stream = TRUE;
} else if ( get_stream_handle(a, &ctx->stream, SH_OUTPUT|SH_ERRORS) )
{ if ( !(ctx->stream->flags &SIO_OUTPUT) )
{ releaseStream(ctx->stream);
return PL_error(NULL, 0, NULL, ERR_PERMISSION,
ATOM_output, ATOM_stream, to);
}
ctx->is_stream = TRUE;
} else
return FALSE;
} else
{ if ( PL_is_functor(to, FUNCTOR_codes2) )
{ ctx->out_format = PL_CODE_LIST;
ctx->out_arity = 2;
} else if ( PL_is_functor(to, FUNCTOR_codes1) )
{ ctx->out_format = PL_CODE_LIST;
ctx->out_arity = 1;
} else if ( PL_is_functor(to, FUNCTOR_chars2) )
{ ctx->out_format = PL_CHAR_LIST;
ctx->out_arity = 2;
} else if ( PL_is_functor(to, FUNCTOR_chars1) )
{ ctx->out_format = PL_CHAR_LIST;
ctx->out_arity = 1;
} else if ( PL_is_functor(to, FUNCTOR_string1) )
{ ctx->out_format = PL_STRING;
ctx->out_arity = 1;
} else if ( PL_is_functor(to, FUNCTOR_atom1) )
{ ctx->out_format = PL_ATOM;
ctx->out_arity = 1;
} else
{ return PL_error(NULL, 0, NULL, ERR_TYPE, ATOM_output, to);
}
ctx->is_stream = FALSE;
ctx->data = ctx->buffer;
ctx->size = sizeof(ctx->buffer);
ctx->stream = Sopenmem(&ctx->data, &ctx->size, "w");
ctx->stream->encoding = ENC_WCHAR;
}
ctx->magic = REDIR_MAGIC;
if ( redir )
{ pushOutputContext();
Scurout = ctx->stream;
}
return TRUE;
}
int
closeOutputRedirect(redir_context *ctx)
{ int rval = TRUE;
if ( ctx->magic != REDIR_MAGIC )
return rval; /* already done */
ctx->magic = 0;
if ( ctx->redirected )
popOutputContext();
if ( ctx->is_stream )
{ rval = streamStatus(ctx->stream);
} else
{ GET_LD
term_t out = PL_new_term_ref();
term_t diff, tail;
if ( Sclose(ctx->stream) == 0 )
{ _PL_get_arg(1, ctx->term, out);
if ( ctx->out_arity == 2 )
{ diff = PL_new_term_ref();
_PL_get_arg(2, ctx->term, diff);
tail = PL_new_term_ref();
} else
{ diff = tail = 0;
}
rval = PL_unify_wchars_diff(out, tail, ctx->out_format,
ctx->size/sizeof(wchar_t),
(wchar_t*)ctx->data);
if ( rval && tail )
rval = PL_unify(tail, diff);
} else
rval = FALSE;
if ( ctx->data != ctx->buffer )
Sfree(ctx->data);
}
return rval;
}
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
discardOutputRedirect() is called if the `implementation' failed. One of
the reasons for failure can be that the implementation detected a
pending I/O stream error, in which case continuation is meaningless.
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
void
discardOutputRedirect(redir_context *ctx)
{ if ( ctx->magic != REDIR_MAGIC )
return; /* already done */
ctx->magic = 0;
if ( ctx->redirected )
popOutputContext();
if ( ctx->is_stream )
{ streamStatus(ctx->stream);
} else
{ closeStream(ctx->stream);
if ( ctx->data != ctx->buffer )
Sfree(ctx->data);
}
}
/** @pred with_output_to(+ _Ouput_,: _Goal_)
This SWI-Prolog predicate runs _Goal_ as once/1, while characters written to the current
output are sent to _Output_.
This predicate supports creating
difference-lists from character data efficiently. The example below
defines the DCG rule `term/3` to insert a term in the output:
~~~~~
term(Term, In, Tail) :-
with_output_to(codes(In, Tail), write(Term)).
?- phrase(term(hello), X).
X = [104, 101, 108, 108, 111]
~~~~~
+ A Stream handle or alias
Temporary switch current output to the given stream. Redirection using with_output_to/2 guarantees the original output is restored, also if Goal fails or raises an exception. See also call_cleanup/2.
+ atom(- _Atom_)
Create an atom from the emitted characters. Please note that there is a cost in creating atoms.
+ string(- _String_)
Create a string-object.
+ codes(- _Codes_)
Create a list of character codes from the emitted characters, similar to atom_codes/2.
+ codes(- _Codes_, - _Tail_)
Create a list of character codes as a difference-list.
+ chars(- _Chars_)
Create a list of one-character-atoms codes from the emitted characters, similar to atom_chars/2.
+ chars(- _Chars_, - _Tail_)
Create a list of one-character-atoms as a difference-list.
*/
static
PRED_IMPL("with_output_to", 2, with_output_to, PL_FA_TRANSPARENT)
{ redir_context outctx;
outctx.magic = 0;
if ( setupOutputRedirect(A1, &outctx, TRUE) )
{ term_t ex = 0;
int rval;
if ( (rval = callProlog(NULL, A2, PL_Q_CATCH_EXCEPTION, &ex)) )
return closeOutputRedirect(&outctx);
discardOutputRedirect(&outctx);
if ( ex )
return PL_raise_exception(ex);
}
return FALSE;
}
void
PL_write_prompt(int dowrite)
{ GET_LD
#if __YAP_PROLOG__
IOSTREAM *s = getStream(Suser_error);
#else
IOSTREAM *s = getStream(Suser_output);
#endif
if ( s )
{ if ( dowrite )
{ atom_t a = PrologPrompt();
if ( a )
writeAtomToStream(s, a);
}
Sflush(s);
releaseStream(s);
}
LD->prompt.next = FALSE;
}
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Get a single character from Sinput without waiting for a return. The
character should not be echoed. If PLFLAG_TTY_CONTROL is false this
function will read the first character and then skip all character upto
and including the newline.
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
static int
Sgetcode_intr(IOSTREAM *s, int signals)
{ int c;
#ifdef __WINDOWS__
int newline = s->newline;
s->newline = SIO_NL_POSIX; /* avoid blocking \r */
#endif
do
{ Sclearerr(s);
c = Sgetcode(s);
} while ( c == -1 &&
errno == EINTR &&
(!signals || PL_handle_signals() >= 0)
);
#ifdef __WINDOWS__
s->newline = newline;
#endif
return c;
}
int
getSingleChar(IOSTREAM *stream, int signals)
{ GET_LD
int c;
ttybuf buf;
suspendTrace(TRUE);
Slock(stream);
Sflush(stream);
PushTty(stream, &buf, TTY_RAW); /* just donot prompt */
if ( !truePrologFlag(PLFLAG_TTY_CONTROL) )
{ int c2;
c2 = Sgetcode_intr(stream, signals);
while( c2 == ' ' || c2 == '\t' ) /* skip blanks */
c2 = Sgetcode_intr(stream, signals);
c = c2;
while( c2 != EOF && c2 != '\n' ) /* read upto newline */
c2 = Sgetcode_intr(stream, signals);
} else
{ if ( stream->position )
{ IOPOS oldpos = *stream->position;
c = Sgetcode_intr(stream, signals);
*stream->position = oldpos;
} else
c = Sgetcode_intr(stream, signals);
}
if ( c == 4 || c == 26 ) /* should ask the terminal! */
c = -1;
PopTty(stream, &buf, TRUE);
suspendTrace(FALSE);
Sunlock(stream);
return c;
}
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
readLine() reads a line from the terminal. It is used only by the tracer.
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
#ifndef DEL
#define DEL 127
#endif
bool
readLine(IOSTREAM *in, IOSTREAM *out, char *buffer)
{ GET_LD
int c;
char *buf = &buffer[strlen(buffer)];
ttybuf tbuf;
Slock(in);
Slock(out);
PushTty(in, &tbuf, TTY_RAW); /* just donot prompt */
for(;;)
{ Sflush(out);
switch( (c=Sgetcode_intr(in, FALSE)) )
{ case '\n':
case '\r':
case EOF:
*buf++ = EOS;
PopTty(in, &tbuf, TRUE);
Sunlock(in);
Sunlock(out);
return c == EOF ? FALSE : TRUE;
case '\b':
case DEL:
if ( truePrologFlag(PLFLAG_TTY_CONTROL) && buf > buffer )
{ Sfputs("\b \b", out);
buf--;
continue;
}
/*FALLTHROUGH*/
default:
if ( truePrologFlag(PLFLAG_TTY_CONTROL) )
Sputcode(c, out);
*buf++ = c;
}
}
return FALSE; /* make eclipse happy */
}
IOSTREAM *
PL_current_input()
{ GET_LD
return getStream(Scurin);
}
IOSTREAM *
PL_current_output()
{ GET_LD
return getStream(Scurout);
}
static int
openProtocol(term_t f, int appnd)
{ GET_LD
IOSTREAM *s;
term_t mode = PL_new_term_ref();
noprotocol();
PL_put_atom(mode, appnd ? ATOM_append : ATOM_write);
if ( (s = openStream(f, mode, 0)) )
{ s->flags |= SIO_NOCLOSE; /* do not close on abort */
Sprotocol = s;
Suser_input->tee = s;
Suser_output->tee = s;
Suser_error->tee = s;
return TRUE;
}
return FALSE;
}
static int
noprotocol(void)
{ GET_LD
IOSTREAM *s;
if ( Sprotocol && (s = getStream(Sprotocol)) )
{ TableEnum e;
Symbol symb;
e = newTableEnum(streamContext);
while( (symb=advanceTableEnum(e)) )
{ IOSTREAM *p = symb->name;
if ( p->tee == s )
p->tee = NULL;
}
freeTableEnum(e);
closeStream(s);
Sprotocol = NULL;
}
return TRUE;
}
/** @pred noprotocol
Stop protocolling user interaction.
*/
static
PRED_IMPL("noprotocol", 0, noprotocol, 0)
{ return noprotocol();
}
//! @}
// @{
//
/*******************************
* STREAM ATTRIBUTES *
*******************************/
static int
setCloseOnExec(IOSTREAM *s, int val)
{ int fd;
if ( (fd = Sfileno(s)) < 0)
return FALSE;
#if defined(F_SETFD) && defined(FD_CLOEXEC)
{ int fd_flags = fcntl(fd, F_GETFD);
if ( fd_flags == -1 )
return FALSE;
if ( val )
fd_flags |= FD_CLOEXEC;
else
fd_flags &= ~FD_CLOEXEC;
if ( fcntl(fd, F_SETFD, fd_flags) == -1 )
return FALSE;
}
#elif defined __WINDOWS__
{ if ( !SetHandleInformation((HANDLE)_get_osfhandle(fd),
HANDLE_FLAG_INHERIT, !val) )
return FALSE;
}
#else
return -1;
#endif
return TRUE;
}
/* returns TRUE: ok, FALSE: error, -1: not available
*/
static int
set_stream(IOSTREAM *s, term_t stream, atom_t aname, term_t a ARG_LD)
{ if ( aname == ATOM_alias ) /* alias(name) */
{ atom_t alias;
int i;
if ( !PL_get_atom_ex(a, &alias) )
return FALSE;
if ( (i=standardStreamIndexFromName(alias)) >= 0 )
{ LD->IO.streams[i] = s;
if ( i == 0 )
LD->prompt.next = TRUE; /* changed standard input: prompt! */
return TRUE;
}
LOCK();
aliasStream(s, alias);
UNLOCK();
return TRUE;
} else if ( aname == ATOM_buffer ) /* buffer(Buffering) */
{ atom_t b;
#define SIO_ABUF (SIO_FBUF|SIO_LBUF|SIO_NBUF)
if ( !PL_get_atom_ex(a, &b) )
return FALSE;
if ( b == ATOM_full )
{ s->flags &= ~SIO_ABUF;
s->flags |= SIO_FBUF;
} else if ( b == ATOM_line )
{ s->flags &= ~SIO_ABUF;
s->flags |= SIO_LBUF;
} else if ( b == ATOM_false )
{ Sflush(s);
s->flags &= ~SIO_ABUF;
s->flags |= SIO_NBUF;
} else
{ return PL_error("set_stream", 2, NULL, ERR_DOMAIN,
ATOM_buffer, a);
}
return TRUE;
} else if ( aname == ATOM_buffer_size )
{ int size;
if ( !PL_get_integer_ex(a, &size) )
return FALSE;
if ( size < 1 )
return PL_error(NULL, 0, NULL, ERR_DOMAIN, ATOM_not_less_than_one, a);
Ssetbuffer(s, NULL, size);
return TRUE;
} else if ( aname == ATOM_eof_action ) /* eof_action(Action) */
{ atom_t action;
if ( !PL_get_atom_ex(a, &action) )
return FALSE;
if ( action == ATOM_eof_code )
{ s->flags &= ~(SIO_NOFEOF|SIO_FEOF2ERR);
} else if ( action == ATOM_reset )
{ s->flags &= ~SIO_FEOF2ERR;
s->flags |= SIO_NOFEOF;
} else if ( action == ATOM_error )
{ s->flags &= ~SIO_NOFEOF;
s->flags |= SIO_FEOF2ERR;
} else
{ PL_error("set_stream", 2, NULL, ERR_DOMAIN,
ATOM_eof_action, a);
return FALSE;
}
return TRUE;
} else if ( aname == ATOM_type ) /* type(Type) */
{ atom_t type;
if ( !PL_get_atom_ex(a, &type) )
return FALSE;
if ( type == ATOM_text )
{ if ( False(s, SIO_TEXT) && Ssetenc(s, LD->encoding, NULL) != 0 )
return PL_error(NULL, 0, NULL, ERR_PERMISSION,
ATOM_encoding, ATOM_stream, stream);
s->flags |= SIO_TEXT;
} else if ( type == ATOM_binary )
{ if ( True(s, SIO_TEXT) && Ssetenc(s, ENC_OCTET, NULL) != 0 )
return PL_error(NULL, 0, NULL, ERR_PERMISSION,
ATOM_encoding, ATOM_stream, stream);
s->flags &= ~SIO_TEXT;
} else
{ return PL_error("set_stream", 2, NULL, ERR_DOMAIN,
ATOM_type, a);
}
return TRUE;
} else if ( aname == ATOM_close_on_abort ) /* close_on_abort(Bool) */
{ int close;
if ( !PL_get_bool_ex(a, &close) )
return FALSE;
if ( close )
s->flags &= ~SIO_NOCLOSE;
else
s->flags |= SIO_NOCLOSE;
return TRUE;
} else if ( aname == ATOM_record_position )
{ int rec;
if ( !PL_get_bool_ex(a, &rec) )
return FALSE;
if ( rec )
s->position = &s->posbuf;
else
s->position = NULL;
return TRUE;
} else if ( aname == ATOM_line_position )
{ int lpos;
if ( !PL_get_integer_ex(a, &lpos) )
return FALSE;
if ( s->position )
s->position->linepos = lpos;
else
return PL_error(NULL, 0, NULL, ERR_PERMISSION,
ATOM_line_position, ATOM_stream, stream);
return TRUE;
} else if ( aname == ATOM_file_name ) /* file_name(Atom) */
{ atom_t fn;
if ( !PL_get_atom_ex(a, &fn) )
return FALSE;
setFileNameStream(s, fn);
return TRUE;
} else if ( aname == ATOM_timeout )
{ double f;
atom_t v;
if ( PL_get_atom(a, &v) && v == ATOM_infinite )
{ s->timeout = -1;
return TRUE;
}
if ( !PL_get_float_ex(a, &f) )
return FALSE;
s->timeout = (int)(f*1000.0);
if ( s->timeout < 0 )
s->timeout = 0;
return TRUE;
} else if ( aname == ATOM_tty ) /* tty(bool) */
{ int val;
if ( !PL_get_bool_ex(a, &val) )
return FALSE;
if ( val )
set(s, SIO_ISATTY);
else
clear(s, SIO_ISATTY);
return TRUE;
} else if ( aname == ATOM_encoding ) /* encoding(atom) */
{ atom_t val;
IOENC enc;
if ( !PL_get_atom_ex(a, &val) )
return FALSE;
if ( (enc = atom_to_encoding(val)) == ENC_UNKNOWN )
{ bad_encoding(NULL, val);
return FALSE;
}
if ( Ssetenc(s, enc, NULL) == 0 )
return TRUE;
return PL_error(NULL, 0, NULL, ERR_PERMISSION,
ATOM_encoding, ATOM_stream, stream);
#ifdef O_LOCALE
} else if ( aname == ATOM_locale ) /* locale(Locale) */
{ PL_locale *val;
if ( !getLocaleEx(a, &val) )
return FALSE;
if ( Ssetlocale(s, val, NULL) == 0 )
return TRUE;
return PL_error(NULL, 0, NULL, ERR_PERMISSION,
ATOM_locale, ATOM_stream, stream);
#endif
} else if ( aname == ATOM_representation_errors )
{ atom_t val;
if ( !PL_get_atom_ex(a, &val) )
return FALSE;
clear(s, SIO_REPXML|SIO_REPPL);
if ( val == ATOM_error ) {
;
} else if ( val == ATOM_xml )
set(s, SIO_REPXML);
else if ( val == ATOM_prolog )
set(s, SIO_REPPL);
else
return PL_error(NULL, 0, NULL, ERR_DOMAIN,
ATOM_representation_errors, a);
return TRUE;
} else if ( aname == ATOM_newline )
{ atom_t val;
if ( !PL_get_atom_ex(a, &val) )
return FALSE;
if ( val == ATOM_posix )
s->newline = SIO_NL_POSIX;
else if ( val == ATOM_dos )
s->newline = SIO_NL_DOS;
else if ( val == ATOM_detect )
{ if ( False(s, SIO_INPUT) )
return PL_error(NULL, 0, "detect only allowed for input streams",
ERR_DOMAIN, ATOM_newline, a);
s->newline = SIO_NL_DETECT;
} else
return PL_error(NULL, 0, NULL, ERR_DOMAIN, ATOM_newline, a);
return TRUE;
} else if ( aname == ATOM_close_on_exec ) /* close_on_exec(bool) */
{ int val;
if ( !PL_get_bool_ex(a, &val) )
return FALSE;
return setCloseOnExec(s, val);
} else
{ assert(0);
return FALSE;
}
}
typedef struct set_stream_info
{ atom_t name;
int flags;
} set_stream_info;
#define SS_READ 0x01
#define SS_WRITE 0x02
#define SS_BOTH (SS_READ|SS_WRITE)
#define SS_NOPAIR (0x4|SS_BOTH)
#define SS_INFO(name, flags) { name, flags }
static const set_stream_info ss_info[] =
{ SS_INFO(ATOM_alias, SS_NOPAIR),
SS_INFO(ATOM_buffer, SS_BOTH),
SS_INFO(ATOM_buffer_size, SS_BOTH),
SS_INFO(ATOM_eof_action, SS_READ),
SS_INFO(ATOM_type, SS_BOTH),
SS_INFO(ATOM_close_on_abort, SS_BOTH),
SS_INFO(ATOM_record_position, SS_BOTH),
SS_INFO(ATOM_line_position, SS_NOPAIR),
SS_INFO(ATOM_file_name, SS_BOTH),
SS_INFO(ATOM_timeout, SS_BOTH),
SS_INFO(ATOM_tty, SS_BOTH),
SS_INFO(ATOM_encoding, SS_BOTH),
SS_INFO(ATOM_locale, SS_BOTH),
SS_INFO(ATOM_representation_errors, SS_WRITE),
SS_INFO(ATOM_newline, SS_BOTH),
SS_INFO(ATOM_close_on_exec, SS_BOTH),
SS_INFO((atom_t)0, 0)
};
/** @pred set_stream(+ _S_, + _Prop_) is iso
Set a property _Prop_ for a stream _S_.
*/
static
PRED_IMPL("set_stream", 2, set_stream, 0)
{ PRED_LD
IOSTREAM *s;
atom_t sblob, aname;
stream_ref *ref;
PL_blob_t *type;
int rc, arity;
const set_stream_info *info;
term_t aval = PL_new_term_ref();
term_t stream = A1;
term_t attr = A2;
if ( PL_get_name_arity(attr, &aname, &arity) && arity == 1 )
{ for(info = ss_info; info->name; info++)
{ if ( info->name == aname )
goto found;
}
return PL_domain_error("stream_attribute", attr);
} else
return PL_type_error("stream_attribute", attr);
found:
_PL_get_arg(1, attr, aval);
if ( !PL_get_atom(stream, &sblob) )
return not_a_stream(stream);
ref = PL_blob_data(sblob, NULL, &type);
if ( type == &stream_blob ) /* got a stream handle */
{ if ( ref->read && ref->write && /* stream pair */
(info->flags & SS_NOPAIR) )
return PL_error("set_stream", 2, NULL, ERR_PERMISSION,
aname, ATOM_stream_pair, stream);
rc = TRUE;
if ( ref->read && (info->flags&SS_READ))
{ if ( !(s = getStream(ref->read)) )
return symbol_no_stream(sblob);
rc = set_stream(s, stream, aname, aval PASS_LD);
releaseStream(ref->read);
}
if ( rc && ref->write && (info->flags&SS_WRITE) )
{ if ( !(s = getStream(ref->write)) )
return symbol_no_stream(sblob);
rc = set_stream(s, stream, aname, aval PASS_LD);
releaseStream(ref->write);
}
} else if ( PL_get_stream_handle(stream, &s) )
{ rc = set_stream(s, stream, aname, aval PASS_LD);
releaseStream(s);
} else
rc = FALSE;
if ( rc < 0 ) /* not on this OS */
return PL_domain_error("stream_attribute", attr);
return rc;
}
#ifdef _MSC_VER /* defined in pl-nt.c */
extern int ftruncate(int fileno, int64_t length);
#define HAVE_FTRUNCATE
#endif
/** @pred set_end_of_stream(+ _S_ ) is iso
Set stream position to be the end of stream.
*/
static
PRED_IMPL("set_end_of_stream", 1, set_end_of_stream, 0)
{ IOSTREAM *s;
int rc;
if ( (rc=PL_get_stream_handle(A1, &s)) )
{
#ifdef HAVE_FTRUNCATE
int fileno = Sfileno(s);
if ( fileno >= 0 )
{ if ( ftruncate(fileno, Stell64(s)) != 0 )
rc = PL_error(NULL, 0, MSG_ERRNO, ERR_FILE_OPERATION,
ATOM_set_end_of_stream, ATOM_stream,
A1);
} else
{ rc = PL_error(NULL, 0, "not a file", ERR_PERMISSION,
ATOM_set_end_of_stream, ATOM_stream, A1);
}
#else
rc = notImplemented("set_end_of_stream", 1);
#endif
releaseStream(s);
}
return rc;
}
/********************************
* STRING I/O *
*********************************/
extern IOFUNCTIONS Smemfunctions;
bool
tellString(char **s, size_t *size, IOENC enc)
{ GET_LD
IOSTREAM *stream;
stream = Sopenmem(s, size, "w");
stream->encoding = enc;
pushOutputContext();
Scurout = stream;
return TRUE;
}
bool
toldString(void)
{ GET_LD
IOSTREAM *s = getStream(Scurout);
if ( !s )
return TRUE;
if ( s->functions == &Smemfunctions )
{ closeStream(s);
popOutputContext();
} else
releaseStream(s);
return TRUE;
}
/********************************
* WAITING FOR INPUT *
********************************/
#ifndef HAVE_SELECT
/** @pred wait_for_input(+ _Streams_, -_Available_, - _Timeout_) is iso
*
* Implement the select operation over a set of stream _Streams, with
* _Available_ unified with all ready streams. The operation can last at most
* _Timeout_ seconds.
*
*
*/
static
PRED_IMPL("wait_for_input", 3, wait_for_input, 0)
{ return notImplemented("wait_for_input", 3);
}
#else
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Windows<->Unix note. This function uses the Windows socket API for its
implementation and defines the Unix API in terms of the Windows API.
This approach allows full support of the restrictions of the Windows
implementation. Because the Unix emulation is more generic, this still
supports the generic facilities of Unix select() that make this
predicate work on pipes, serial devices, etc.
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
#ifndef __WINDOWS__
typedef int SOCKET;
#define INVALID_SOCKET -1
#define Swinsock(s) Sfileno(s)
#define NFDS(max) (max+1) /* see also S__wait() */
#else
#define NFDS(n) 0
#endif
typedef struct fdentry
{ SOCKET fd;
term_t stream;
struct fdentry *next;
} fdentry;
static
PRED_IMPL("wait_for_input", 3, wait_for_input, 0)
{ PRED_LD
fd_set fds;
struct timeval t, *to;
double time;
int rc;
#ifndef __WINDOWS__
SOCKET max = 0, min = INT_MAX;
#endif
fdentry *map = NULL;
term_t head = PL_new_term_ref();
term_t streams = PL_copy_term_ref(A1);
term_t available = PL_copy_term_ref(A2);
term_t ahead = PL_new_term_ref();
int from_buffer = 0;
atom_t a;
term_t timeout = A3;
FD_ZERO(&fds);
while( PL_get_list(streams, head, streams) )
{ IOSTREAM *s;
SOCKET fd;
fdentry *e;
if ( !PL_get_stream_handle(head, &s) )
return FALSE;
if ( (fd=Swinsock(s)) < 0 )
{ releaseStream(s);
return PL_error("wait_for_input", 3, NULL, ERR_DOMAIN,
PL_new_atom("file_stream"), head);
}
releaseStream(s);
/* check for input in buffer */
if ( s->bufp < s->limitp )
{ if ( !PL_unify_list(available, ahead, available) ||
!PL_unify(ahead, head) )
return FALSE;
from_buffer++;
}
e = alloca(sizeof(*e));
e->fd = fd;
e->stream = PL_copy_term_ref(head);
e->next = map;
map = e;
FD_SET(fd, &fds);
#ifndef __WINDOWS__
if ( fd > max )
max = fd;
if( fd < min )
min = fd;
#endif
}
if ( !PL_get_nil(streams) )
return PL_error("wait_for_input", 3, NULL, ERR_TYPE, ATOM_list, A1);
if ( from_buffer > 0 )
return PL_unify_nil(available);
if ( PL_get_atom(timeout, &a) && a == ATOM_infinite )
{ to = NULL;
} else if ( PL_is_integer(timeout) )
{ long v;
PL_get_long(timeout, &v);
if ( v > 0L )
{ t.tv_sec = v;
t.tv_usec = 0;
to = &t;
} else if ( v == 0 )
{ to = NULL;
} else
{ t.tv_sec = 0;
t.tv_usec = 0;
to = &t;
}
} else
{ if ( !PL_get_float(timeout, &time) )
return PL_error("wait_for_input", 3, NULL,
ERR_TYPE, ATOM_float, timeout);
if ( time >= 0.0 )
{ t.tv_sec = (int)time;
t.tv_usec = ((int)(time * 1000000) % 1000000);
} else
{ t.tv_sec = 0;
t.tv_usec = 0;
}
to = &t;
}
while( (rc=select(NFDS(max), &fds, NULL, NULL, to)) == -1 &&
errno == EINTR )
{ fdentry *e;
if ( PL_handle_signals() < 0 )
return FALSE; /* exception */
FD_ZERO(&fds); /* EINTR may leave fds undefined */
for(e=map; e; e=e->next) /* so we rebuild it to be safe */
FD_SET(e->fd, &fds);
}
switch(rc)
{ case -1:
return PL_error("wait_for_input", 3, MSG_ERRNO, ERR_FILE_OPERATION,
ATOM_select, ATOM_stream, A1);
case 0: /* Timeout */
break;
default: /* Something happend -> check fds */
{ fdentry *mp;
for(mp=map; mp; mp=mp->next)
{ if ( FD_ISSET(mp->fd, &fds) )
{ if ( !PL_unify_list(available, ahead, available) ||
!PL_unify(ahead, mp->stream) )
return FALSE;
}
}
break;
}
}
return PL_unify_nil(available);
}
#endif /* HAVE_SELECT */
/********************************
* PROLOG CONNECTION *
*********************************/
#define MAX_PENDING SIO_BUFSIZE /* 4096 */
static void
re_buffer(IOSTREAM *s, const char *from, size_t len)
{ if ( s->bufp < s->limitp )
{ size_t size = s->limitp - s->bufp;
memmove(s->buffer, s->bufp, size);
s->bufp = s->buffer;
s->limitp = &s->bufp[size];
} else
{ s->bufp = s->limitp = s->buffer;
}
memmove(s->bufp, from, len);
s->bufp += len;
}
#ifndef HAVE_MBSNRTOWCS
static size_t
mbsnrtowcs(wchar_t *dest, const char **src,
size_t nms, size_t len, mbstate_t *ps)
{ wchar_t c;
const char *us = *src;
const char *es = us+nms;
size_t count = 0;
assert(dest == NULL); /* incomplete implementation */
while(us<es)
{ size_t skip = mbrtowc(&c, us, es-us, ps);
if ( skip == (size_t)-1 ) /* error */
{ DEBUG(1, Sdprintf("mbsnrtowcs(): bad multibyte seq\n"));
return skip;
}
if ( skip == (size_t)-2 ) /* incomplete */
{ *src = us;
return count;
}
count++;
us += skip;
}
*src = us;
return count;
}
#else
#if defined(HAVE_DECL_MBSNRTOWCS) && !HAVE_DECL_MBSNRTOWCS
size_t mbsnrtowcs(wchar_t *dest, const char **src,
size_t nms, size_t len, mbstate_t *ps);
#endif
#endif /*HAVE_MBSNRTOWCS*/
static int
skip_cr(IOSTREAM *s)
{ if ( s->flags&SIO_TEXT )
{ switch(s->newline)
{ case SIO_NL_DETECT:
s->newline = SIO_NL_DOS;
/*FALLTHROUGH*/
case SIO_NL_DOS:
return TRUE;
}
}
return FALSE;
}
/** @pred read_pending_input( _Stream_ , _Codes_, _End_ )
*
* Reads all characters or bytes currently available from _Stream_ to the difference
* list _Codes_ - _End_. This SWI predicate allows cleaning up input from unbuffered
* streams.
*/
static
PRED_IMPL("read_pending_input", 3, read_pending_input, 0)
{ PRED_LD
IOSTREAM *s;
if ( getInputStream(A1, S_DONTCARE, &s) )
{ char buf[MAX_PENDING];
ssize_t n;
int64_t off0 = Stell64(s);
IOPOS pos0;
list_ctx ctx;
if ( Sferror(s) )
return streamStatus(s);
n = Sread_pending(s, buf, sizeof(buf), 0);
if ( n < 0 ) /* should not happen */
return streamStatus(s);
if ( n == 0 ) /* end-of-file */
{ S__fcheckpasteeof(s, -1);
return PL_unify(A2, A3);
}
if ( s->position )
{ pos0 = *s->position;
} else
{ memset(&pos0, 0, sizeof(pos0)); /* make compiler happy */
}
switch(s->encoding)
{ case ENC_OCTET:
case ENC_ISO_LATIN_1:
case ENC_ASCII:
{ ssize_t i;
if ( !allocList(n, &ctx) )
return FALSE;
for(i=0; i<n; i++)
{ int c = buf[i]&0xff;
if ( c == '\r' && skip_cr(s) )
continue;
if ( s->position )
S__fupdatefilepos_getc(s, c);
addSmallIntList(&ctx, c);
}
if ( s->position )
s->position->byteno = pos0.byteno+n;
break;
}
case ENC_ANSI:
{ size_t count, i;
mbstate_t s0;
const char *us = buf;
const char *es = buf+n;
if ( !s->mbstate )
{ if ( !(s->mbstate = malloc(sizeof(*s->mbstate))) )
{ PL_error(NULL, 0, NULL, ERR_NOMEM);
goto failure;
}
memset(s->mbstate, 0, sizeof(*s->mbstate));
}
s0 = *s->mbstate;
count = mbsnrtowcs(NULL, &us, n, 0, &s0);
if ( count == (size_t)-1 )
{ Sseterr(s, SIO_WARN, "Illegal multibyte Sequence");
goto failure;
}
DEBUG(2, Sdprintf("Got %ld codes from %d bytes; incomplete: %ld\n",
count, n, es-us));
if ( !allocList(count, &ctx) )
return FALSE;
for(us=buf,i=0; i<count; i++)
{ wchar_t c;
us += mbrtowc(&c, us, es-us, s->mbstate);
if ( c == '\r' && skip_cr(s) )
continue;
if ( s->position )
S__fupdatefilepos_getc(s, c);
addSmallIntList(&ctx, c);
}
if ( s->position )
s->position->byteno = pos0.byteno+us-buf;
re_buffer(s, us, es-us);
break;
}
case ENC_UTF8:
{ const char *us = buf;
const char *es = buf+n;
size_t count = 0, i;
while(us<es)
{ if ( !(us[0]&0x80) )
{ count++;
us++;
} else
{ int ex = UTF8_FBN(us[0]);
if ( ex >= 0 )
{ const char *ec = us + ex + 1;
if ( ec <= es )
{ count++;
us=ec;
} else /* incomplete multi-byte */
break;
} else
{ Sseterr(s, SIO_WARN, "Illegal multibyte Sequence");
goto failure;
}
}
}
DEBUG(2, Sdprintf("Got %ld codes from %d bytes; incomplete: %ld\n",
count, n, es-us));
if ( !allocList(count, &ctx) )
return FALSE;
for(us=buf,i=0; i<count; i++)
{ int c;
us = utf8_get_char(us, &c);
if ( c == '\r' && skip_cr(s) )
continue;
if ( s->position )
S__fupdatefilepos_getc(s, c);
addSmallIntList(&ctx, c);
}
if ( s->position )
s->position->byteno = pos0.byteno+us-buf;
re_buffer(s, us, es-us);
break;
}
case ENC_UNICODE_BE:
case ENC_UNICODE_LE:
{ size_t count = (size_t)n/2;
const char *us = buf;
size_t done, i;
if ( !allocList(count, &ctx) )
return FALSE;
for(i=0; i<count; us+=2, i++)
{ int c;
if ( s->encoding == ENC_UNICODE_BE )
c = ((us[0]&0xff)<<8)+(us[1]&0xff);
else
c = ((us[1]&0xff)<<8)+(us[0]&0xff);
if ( c == '\r' && skip_cr(s) )
continue;
if ( s->position )
S__fupdatefilepos_getc(s, c);
addSmallIntList(&ctx, c);
}
done = count*2;
if ( s->position )
s->position->byteno = pos0.byteno+done;
re_buffer(s, buf+done, n-done);
break;
}
case ENC_WCHAR:
{ const pl_wchar_t *ws = (const pl_wchar_t*)buf;
size_t count = (size_t)n/sizeof(pl_wchar_t);
size_t done, i;
if ( !allocList(count, &ctx) )
return FALSE;
for(i=0; i<count; i++)
{ int c = ws[i];
if ( c == '\r' && skip_cr(s) )
continue;
if ( s->position )
S__fupdatefilepos_getc(s, c);
addSmallIntList(&ctx, c);
}
done = count*sizeof(pl_wchar_t);
if ( s->position )
s->position->byteno = pos0.byteno+done;
re_buffer(s, buf+done, n-done);
break;
}
case ENC_UNKNOWN:
default:
assert(0);
return FALSE;
}
if ( !unifyDiffList(A2, A3, &ctx) )
goto failure;
releaseStream(s);
return TRUE;
failure:
Sseek64(s, off0, SIO_SEEK_SET); /* TBD: error? */
if ( s->position )
*s->position = pos0;
releaseStream(s);
return FALSE;
}
return FALSE;
}
//! @}
//! @defgroup CharsIO Character Input/Output
// @ingroup InputOutput
// @{
//
static foreign_t
put_byte(term_t stream, term_t byte ARG_LD)
{ IOSTREAM *s;
int c;
if ( !PL_get_integer(byte, &c) || c < 0 || c > 255 )
return PL_error(NULL, 0, NULL, ERR_TYPE, ATOM_byte, byte);
if ( !getBinaryOutputStream(stream, &s) )
return FALSE;
Sputc(c, s);
return streamStatus(s);
}
/** @pred put_byte(+ _S_,+ _N_) is iso
As `put_byte(N)`, but to binary stream _S_.
*/
static
PRED_IMPL("put_byte", 2, put_byte2, 0)
{ PRED_LD
return put_byte(A1, A2 PASS_LD);
}
/** @pred put_byte(+ _N_) is iso
Outputs to the current output stream the character whose code is
_N_. The current output stream must be a binary stream.
*/
static
PRED_IMPL("put_byte", 1, put_byte1, 0)
{ PRED_LD
return put_byte(0, A1 PASS_LD);
}
static foreign_t
put_code(term_t stream, term_t chr ARG_LD)
{ IOSTREAM *s;
int c = 0;
if ( !PL_get_char(chr, &c, FALSE) )
return FALSE;
if ( !getTextOutputStream(stream, &s) )
return FALSE;
Sputcode(c, s);
return streamStatus(s);
}
/** @pred put_code(+ _S_,+ _N_) is iso
As `put_code(N)`, but to text stream _S_.
*/
/** @pred put_char(+ _S_,+ _A_) is iso
As `put_char(A)`, but to text stream _S_.
*/
static
PRED_IMPL("put_code", 2, put_code2, 0)
{ PRED_LD
return put_code(A1, A2 PASS_LD);
}
/** @pred put_char(+ _N_) is iso
Outputs to the current output stream the character who is used to build
the representation of atom `A`. The current output stream must be a
text stream.
*/
/** @pred put_code(+ _N_) is iso
Outputs to the current output stream the character whose ASCII code is
_N_. The current output stream must be a text stream. The character
_N_ must be a legal ASCII character code, an expression yielding such
a code, or a list in which case only the first element is used.
*/
static
PRED_IMPL("put_code", 1, put_code1, 0)
{ PRED_LD
return put_code(0, A1 PASS_LD);
}
/** @pred put(+ _S_,+ _N_)
As `put(N)`, but to stream _S_.
*/
static
PRED_IMPL("put", 2, put2, 0)
{ PRED_LD
return put_code(A1, A2 PASS_LD);
}
/** @pred put(+ _N_)
Outputs to the current output stream the character whose ASCII code is
_N_. The character _N_ must be a legal ASCII character code, an
expression yielding such a code, or a list in which case only the first
element is used.
*/
static
PRED_IMPL("put", 1, put1, 0)
{ PRED_LD
return put_code(0, A1 PASS_LD);
}
static foreign_t
get_nonblank(term_t in, term_t chr ARG_LD)
{ IOSTREAM *s;
if ( getTextInputStream(in, &s) )
{ int c;
for(;;)
{ c = Sgetcode(s);
if ( c == EOF )
{ TRY(PL_unify_integer(chr, -1));
return streamStatus(s);
}
if ( !isBlankW(c) )
{ releaseStream(s);
return PL_unify_integer(chr, c);
}
}
}
return FALSE;
}
/** @pred get(- _C_)
The next non-blank character from the current input stream is unified
with _C_. Blank characters are the ones whose ASCII codes are not
greater than 32. If there are no more non-blank characters in the
stream, _C_ is unified with -1. If `end_of_stream` has already
been reached in the previous reading, this call will give an error message.
*/
static
PRED_IMPL("get", 1, get1, 0)
{ PRED_LD
return get_nonblank(0, A1 PASS_LD);
}
/** @pred get(+ _S_,- _C_)
The same as `get(C)`, but from stream _S_.
*/
static
PRED_IMPL("get", 2, get2, 0)
{ PRED_LD
return get_nonblank(A1, A2 PASS_LD);
}
static foreign_t
skip(term_t in, term_t chr ARG_LD)
{ int c = -1;
int r;
IOSTREAM *s;
if ( !PL_get_char(chr, &c, FALSE) )
return FALSE;
if ( !getTextInputStream(in, &s) )
return FALSE;
while((r=Sgetcode(s)) != c && r != EOF )
;
return streamStatus(s);
}
/** @pred skip(+ _N_)
Skips input characters until the next occurrence of the character with
ASCII code _N_. The argument to this predicate can take the same forms
as those for `put` (see 6.11).
*/
static
PRED_IMPL("skip", 1, skip1, 0)
{ PRED_LD
return skip(0, A1 PASS_LD);
}
/** @pred skip(+ _S_,- _C_)
Like skip/1, but using stream _S_ instead of the current
input stream.
*/
static
PRED_IMPL("skip", 2, skip2, 0)
{ PRED_LD
return skip(A1, A2 PASS_LD);
}
/** @pred get_single_char( +_Stream_ )
*
* SWI-Prolog predicate that reads the first charcter from `user_input`.
* This operation is unbuffered,
* and it does not have to wait for n newline. Spaces and tabulation characters are
* ignored.
*/
static
PRED_IMPL("get_single_char", 1, get_single_char, 0)
{ GET_LD
IOSTREAM *s = getStream(Suser_input);
int c;
if ( !s )
return symbol_no_stream(ATOM_user_input);
c = getSingleChar(s, TRUE);
if ( c == EOF )
{ if ( PL_exception(0) )
{ releaseStream(s);
return FALSE;
}
PL_unify_integer(A1, -1);
return streamStatus(s);
}
releaseStream(s);
return PL_unify_integer(A1, c);
}
static foreign_t
get_byte2(term_t in, term_t chr ARG_LD)
{ IOSTREAM *s;
if ( getBinaryInputStream(in, &s) )
{ int c = Sgetc(s);
if ( PL_unify_integer(chr, c) )
return streamStatus(s);
if ( Sferror(s) )
return streamStatus(s);
PL_get_char(chr, &c, TRUE); /* set type-error */
}
return FALSE;
}
/** @pred get_byte(+ _S_,- _C_) is iso
If _C_ is unbound, or is a character code, and the stream _S_ is a
binary stream, read the next byte from that stream and unify its
code with _C_.
*/
static
PRED_IMPL("get_byte", 2, get_byte2, 0)
{ PRED_LD
return get_byte2(A1, A2 PASS_LD);
}
/** @pred get_byte(- _C_) is iso
If _C_ is unbound, or is a character code, and the current stream is a
binary stream, read the next byte from the current stream and unify its
code with _C_.
*/
static
PRED_IMPL("get_byte", 1, get_byte1, 0)
{ PRED_LD
return get_byte2(0, A1 PASS_LD);
}
/** @pred get0(+ _S_,- _C_)
The same as `get0(C)`, but from stream _S_.
*/
static foreign_t
get_code2(term_t in, term_t chr ARG_LD)
{ IOSTREAM *s;
if ( getTextInputStream(in, &s) )
{ int c = Sgetcode(s);
if ( PL_unify_integer(chr, c) )
return streamStatus(s);
if ( Sferror(s) )
return streamStatus(s);
PL_get_char(chr, &c, TRUE); /* set type-error */
releaseStream(s);
}
return FALSE;
}
/** @pred get_code(+ _S_,- _C_) is iso
If _C_ is unbound, or is a character code, and the stream _S_ is a
text stream, read the next character from that stream and unify its
code with _C_.
*/
static
PRED_IMPL("get_code", 2, get_code2, 0)
{ PRED_LD
return get_code2(A1, A2 PASS_LD);
}
/** @pred get_code(- _C_) is iso
If _C_ is unbound, or is the code for a character, and
the current stream is a text stream, read the next character from the
current stream and unify its code with _C_.
*/
static
PRED_IMPL("get_code", 1, get_code1, 0)
{ PRED_LD
return get_code2(0, A1 PASS_LD);
}
static foreign_t
get_char2(term_t in, term_t chr ARG_LD)
{ IOSTREAM *s;
if ( getTextInputStream(in, &s) )
{ int c = Sgetcode(s);
if ( PL_unify_atom(chr, c == -1 ? ATOM_end_of_file : codeToAtom(c)) )
return streamStatus(s);
if ( Sferror(s) )
return streamStatus(s);
PL_get_char(chr, &c, TRUE); /* set type-error */
releaseStream(s);
}
return FALSE;
}
/** @pred get_char(+ _S_,- _C_) is iso
If _C_ is unbound, or is an atom representation of a character, and
the stream _S_ is a text stream, read the next character from that
stream and unify its representation as an atom with _C_.
*/
static
PRED_IMPL("get_char", 2, get_char2, 0)
{ PRED_LD
return get_char2(A1, A2 PASS_LD);
}
/** @pred get_char(- _C_) is iso
If _C_ is unbound, or is an atom representation of a character, and
the current stream is a text stream, read the next character from the
current stream and unify its atom representation with _C_.
*/
static
PRED_IMPL("get_char", 1, get_char1, 0)
{ PRED_LD
return get_char2(0, A1 PASS_LD);
}
/** @pred ttyflush
Flush the current output stream.
*/
static
PRED_IMPL("ttyflush", 0, ttyflush, 0)
{ PRED_LD
IOSTREAM *s = getStream(Suser_output);
if ( s )
{ Sflush(s);
return streamStatus(s);
}
return symbol_no_stream(ATOM_user_output);
}
/** @pred protocol( _File_ )
*
* Start protocolling user interaction to _File_, closing any previous protocolling
* file and truncating it.
*
*/
static
PRED_IMPL("protocol", 1, protocol, 0)
{ return openProtocol(A1, FALSE);
}
/** @pred protocola( _File_ )
*
* Start protocolling user interaction to _File_, closing any previous protocolling
* file and then appending it.
*
*/
static
PRED_IMPL("protocola", 1, protocola, 0)
{ return openProtocol(A1, TRUE);
}
/** @pred protocolling( -_File_ )
*
* Report whether we are protocolling and to which _File_.
*
*/
static
PRED_IMPL("protocolling", 1, protocolling, 0)
{ PRED_LD
IOSTREAM *s;
if ( (s = Sprotocol) )
{ atom_t a;
if ( (a = fileNameStream(s)) )
return PL_unify_atom(A1, a);
else
return PL_unify_stream_or_alias(A1, s);
}
return FALSE;
}
/** @pred prompt(- _A_,+ _B_)
Changes YAP input prompt from _A_ to _B_.
*/
static
PRED_IMPL("prompt", 2, prompt, 0)
{ PRED_LD
atom_t a;
term_t old = A1;
term_t new = A2;
if ( PL_unify_atom(old, LD->prompt.current) &&
PL_get_atom_ex(new, &a) )
{ if ( LD->prompt.current )
PL_unregister_atom(LD->prompt.current);
LD->prompt.current = a;
PL_register_atom(a);
return TRUE;
}
return FALSE;
}
/** @pred prompt1(+ _Prompt_)
Set the YAP input prompt for the next line.
*/
void
prompt1(atom_t prompt)
{ GET_LD
if ( LD->prompt.first != prompt )
{ if ( LD->prompt.first )
PL_unregister_atom(LD->prompt.first);
LD->prompt.first = prompt;
PL_register_atom(LD->prompt.first);
}
LD->prompt.first_used = FALSE;
}
static
PRED_IMPL("prompt1", 1, prompt1, 0)
{ GET_LD
atom_t a;
PL_chars_t txt;
if ( PL_get_atom(A1, &a) )
{ prompt1(a);
} else if ( PL_get_text(A1, &txt, CVT_ALL|CVT_EXCEPTION) )
{ prompt1(YAP_SWIAtomFromAtom(textToAtom(&txt)));
} else
return FALSE;
return TRUE;
}
atom_t
PrologPrompt()
{ GET_LD
if ( !LD->prompt.first_used && LD->prompt.first )
{ LD->prompt.first_used = TRUE;
return LD->prompt.first;
}
if ( Sinput->position && Sinput->position->linepos == 0 )
return LD->prompt.current;
else
return 0; /* "" */
}
static int
tab(term_t out, term_t spaces ARG_LD)
{ int64_t count;
IOSTREAM *s;
if ( !getTextOutputStream(out, &s) )
return FALSE;
if ( !PL_eval_expression_to_int64_ex(spaces, &count) )
return FALSE;
while(count-- > 0)
{ if ( Sputcode(' ', s) < 0 )
break;
}
return streamStatus(s);
}
/** @pred tab(+ _S_,+ _N_)
The same as tab/1, but using stream _S_.
*/
static
PRED_IMPL("tab", 2, tab2, 0)
{ PRED_LD
return tab(A1, A2 PASS_LD);
}
/** @pred tab(+ _N_)
Outputs _N_ spaces to the current output stream.
*/
static
PRED_IMPL("tab", 1, tab1, 0)
{ PRED_LD
return tab(0, A1 PASS_LD);
}
/*******************************
* ENCODING *
*******************************/
static struct encname
{ IOENC code;
atom_t name;
} encoding_names[] =
{ { ENC_UNKNOWN, ATOM_unknown },
{ ENC_OCTET, ATOM_octet },
{ ENC_ASCII, ATOM_ascii },
{ ENC_ISO_LATIN_1, ATOM_iso_latin_1 },
{ ENC_ANSI, ATOM_text },
{ ENC_UTF8, ATOM_utf8 },
{ ENC_UNICODE_BE, ATOM_unicode_be },
{ ENC_UNICODE_LE, ATOM_unicode_le },
{ ENC_WCHAR, ATOM_wchar_t },
{ ENC_UNKNOWN, 0 },
};
IOENC
atom_to_encoding(atom_t a)
{ struct encname *en;
for(en=encoding_names; en->name; en++)
{ if ( en->name == a )
return en->code;
}
return ENC_UNKNOWN;
}
atom_t
encoding_to_atom(IOENC enc)
{ return encoding_names[enc].name;
}
static int
bad_encoding(const char *msg, atom_t name)
{ GET_LD
term_t t = PL_new_term_ref();
PL_put_atom(t, name);
return PL_error(NULL, 0, msg, ERR_DOMAIN, ATOM_encoding, t);
}
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
fn_to_atom() translates a 8-bit filename into a unicode atom. The
encoding is generic `multibyte' on Unix systems and fixed to UTF-8 on
Windows, where the uxnt layer translates the UTF-8 sequences to the
Windows *W() functions.
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
static atom_t
fn_to_atom(const char *fn)
{ PL_chars_t text;
atom_t a;
text.text.t = (char *)fn;
text.encoding = ((REP_FN&REP_UTF8) ? ENC_UTF8 :
(REP_FN&REP_MB) ? ENC_ANSI : ENC_ISO_LATIN_1);
text.storage = PL_CHARS_HEAP;
text.length = strlen(fn);
text.canonical = FALSE;
a = YAP_SWIAtomFromAtom(textToAtom(&text));
PL_free_text(&text);
return a;
}
/********************************
* STREAM BASED I/O *
*********************************/
static const opt_spec open4_options[] =
{ { ATOM_type, OPT_ATOM },
{ ATOM_reposition, OPT_BOOL },
{ ATOM_alias, OPT_ATOM },
{ ATOM_eof_action, OPT_ATOM },
{ ATOM_close_on_abort, OPT_BOOL },
{ ATOM_buffer, OPT_ATOM },
{ ATOM_lock, OPT_ATOM },
{ ATOM_wait, OPT_BOOL },
{ ATOM_encoding, OPT_ATOM },
{ ATOM_bom, OPT_BOOL },
{ ATOM_scripting, OPT_BOOL },
#ifdef O_LOCALE
{ ATOM_locale, OPT_LOCALE },
#endif
{ NULL_ATOM, 0 }
};
/* MT: openStream() must be called unlocked */
IOSTREAM *
openStream(term_t file, term_t mode, term_t options)
{ GET_LD
atom_t mname;
atom_t type = ATOM_text;
int reposition = TRUE;
atom_t alias = NULL_ATOM;
atom_t eof_action = ATOM_eof_code;
int close_on_abort = TRUE;
atom_t buffer = ATOM_full;
atom_t lock = ATOM_none;
int wait = TRUE;
atom_t encoding = NULL_ATOM;
int bom = -1;
int scripting = FALSE;
#ifdef O_LOCALE
PL_locale *locale = NULL;
#endif
char how[10];
char *h = how;
char *path;
IOSTREAM *s;
IOENC enc;
if ( options )
{ if ( !scan_options(options, 0, ATOM_stream_option, open4_options,
&type, &reposition, &alias, &eof_action,
&close_on_abort, &buffer, &lock, &wait,
&encoding, &bom, &scripting
#ifdef O_LOCALE
, &locale
#endif
) )
return FALSE;
}
/* MODE */
if ( PL_get_atom(mode, &mname) )
{ if ( mname == ATOM_write )
{ *h++ = 'w';
} else if ( mname == ATOM_append )
{ *h++ = 'a';
} else if ( mname == ATOM_update )
{ *h++ = 'u';
} else if ( mname == ATOM_read )
{ *h++ = 'r';
} else
{ PL_error(NULL, 0, NULL, ERR_DOMAIN, ATOM_io_mode, mode);
return NULL;
}
} else
{ PL_error(NULL, 0, NULL, ERR_TYPE, ATOM_atom, mode);
return NULL;
}
/* ENCODING */
if ( encoding != NULL_ATOM )
{ enc = atom_to_encoding(encoding);
if ( enc == ENC_UNKNOWN )
{ bad_encoding(NULL, encoding);
return NULL;
}
if ( type == ATOM_binary && enc != ENC_OCTET )
{ bad_encoding("type(binary) implies encoding(octet)", encoding);
return NULL;
}
switch(enc) /* explicitely specified: do not */
{ case ENC_OCTET: /* switch to Unicode. For implicit */
case ENC_ASCII: /* and unicode types we must detect */
case ENC_ISO_LATIN_1: /* and skip the BOM */
case ENC_WCHAR:
bom = FALSE;
break;
default:
;
}
} else if ( type == ATOM_binary )
{ enc = ENC_OCTET;
bom = FALSE;
} else
{ enc = LD->encoding;
}
if ( bom == -1 )
bom = (mname == ATOM_read ? TRUE : FALSE);
if ( type == ATOM_binary )
*h++ = 'b';
/* LOCK */
if ( lock != ATOM_none )
{ *h++ = (wait ? 'l' : 'L');
if ( lock == ATOM_read || lock == ATOM_shared )
*h++ = 'r';
else if ( lock == ATOM_write || lock == ATOM_exclusive )
*h++ = 'w';
else
{ term_t l = PL_new_term_ref();
PL_put_atom(l, lock);
PL_error(NULL, 0, NULL, ERR_DOMAIN, ATOM_lock, l);
return NULL;
}
}
*h = EOS;
/* FILE */
#ifdef HAVE_POPEN
if ( PL_is_functor(file, FUNCTOR_pipe1) )
{ term_t a;
char *cmd;
PL_clear_exception();
a = PL_new_term_ref();
_PL_get_arg(1, file, a);
if ( !PL_get_chars(a, &cmd, CVT_ATOM|CVT_STRING|REP_FN) )
{ PL_error(NULL, 0, NULL, ERR_TYPE, ATOM_atom, a);
return NULL;
}
if ( !(s = Sopen_pipe(cmd, how)) )
{ PL_error(NULL, 0, OsError(), ERR_FILE_OPERATION,
ATOM_open, ATOM_source_sink, file);
return NULL;
}
} else
#endif /*HAVE_POPEN*/
if ( PL_get_file_name(file, &path, 0) )
{
if ( !(s = Sopen_file(path, how)) )
{ PL_error(NULL, 0, OsError(), ERR_FILE_OPERATION,
ATOM_open, ATOM_source_sink, file);
return NULL;
}
setFileNameStream_unlocked(s, fn_to_atom(path));
} else
{ return NULL;
}
s->encoding = enc;
#ifdef O_LOCALE
if ( locale )
{ Ssetlocale(s, locale, NULL);
releaseLocale(locale); /* acquired by scan_options() */
}
#endif
if ( !close_on_abort )
s->flags |= SIO_NOCLOSE;
if ( how[0] == 'r' )
{ if ( eof_action != ATOM_eof_code )
{ if ( eof_action == ATOM_reset )
s->flags |= SIO_NOFEOF;
else if ( eof_action == ATOM_error )
s->flags |= SIO_FEOF2ERR;
else
{ term_t ex = PL_new_term_ref();
PL_put_atom(ex, eof_action);
PL_error(NULL, 0, NULL, ERR_DOMAIN, ATOM_eof_action, ex);
return NULL;
}
}
} else
{ if ( buffer != ATOM_full )
{ s->flags &= ~SIO_FBUF;
if ( buffer == ATOM_line )
s->flags |= SIO_LBUF;
else if ( buffer == ATOM_false )
s->flags |= SIO_NBUF;
else
{ term_t ex = PL_new_term_ref();
PL_put_atom(ex, buffer);
PL_error(NULL, 0, NULL, ERR_DOMAIN, ATOM_buffer, ex);
return NULL;
}
}
}
if ( alias != NULL_ATOM )
{ LOCK();
aliasStream(s, alias);
UNLOCK();
}
if ( !reposition )
s->position = NULL;
if ( bom )
{ if ( mname == ATOM_read )
{ if ( ScheckBOM(s) < 0 )
{ bom_error:
streamStatus(getStream(s));
return NULL;
}
if ( scripting) {
int c;
while (( c = Sgetc(s)) == '#') {
while( (c = Sgetc(s)) != EOF && c != 10);
}
if ( c != EOF )
Sungetc(c, s);
else goto bom_error;
}
} else
{ if ( mname == ATOM_write ||
( (mname == ATOM_append || mname == ATOM_update) &&
Ssize(s) == 0 ) )
{ if ( SwriteBOM(s) < 0 )
goto bom_error;
}
}
}
return s;
}
/** @pred open(+ _F_,+ _M_,- _S_,+ _Opts_) is iso
Opens the file with name _F_ in mode _M_ (`read`, `write` or
`append`), returning _S_ unified with the stream name, and following
these options:
+ `type(+ _T_)` is iso
Specify whether the stream is a `text` stream (default), or a
`binary` stream.
+ `reposition(+ _Bool_)` is iso
Specify whether it is possible to reposition the stream (`true`), or
not (`false`). By default, YAP enables repositioning for all
files, except terminal files and sockets.
+ `eof(+ _Action_)` is iso
Specify the action to take if attempting to input characters from a
stream where we have previously found an `end_of_file`. The possible
actions are `error`, that raises an error, `reset`, that tries to
reset the stream and is used for `tty` type files, and `eof_code`,
which generates a new `end_of_file` (default for non-tty files).
+ `alias(+ _Name_)` is iso
Specify an alias to the stream. The alias <tt>Name</tt> must be an atom. The
alias can be used instead of the stream descriptor for every operation
concerning the stream.
The operation will fail and give an error if the alias name is already
in use. YAP allows several aliases for the same file, but only
one is returned by stream_property/2
+ `bom(+ _Bool_)`
If present and `true`, a BOM (<em>Byte Order Mark</em>) was
detected while opening the file for reading or a BOM was written while
opening the stream. See BOM for details.
+ `encoding(+ _Encoding_)`
Set the encoding used for text. See Encoding for an overview of
wide character and encoding issues.
+ `representation_errors(+ _Mode_)`
Change the behaviour when writing characters to the stream that cannot
be represented by the encoding. The behaviour is one of `error`
(throw and Input/Output error exception), `prolog` (write `\u...\`
escape code or `xml` (write `\&#...;` XML character entity).
The initial mode is `prolog` for the user streams and
`error` for all other streams. See also Encoding.
+ `expand_filename(+ _Mode_)`
If _Mode_ is `true` then do filename expansion, then ask Prolog
to do file name expansion before actually trying to opening the file:
this includes processing `~` characters and processing `$`
environment variables at the beginning of the file. Otherwise, just try
to open the file using the given name.
The default behavior is given by the Prolog flag
open_expands_filename.
*/
static
PRED_IMPL("open", 4, open4, PL_FA_ISO)
{ IOSTREAM *s = openStream(A1, A2, A4);
if ( s )
return PL_unify_stream_or_alias(A3, s);
return FALSE;
}
/** @pred open(+ _F_,+ _M_,- _S_) is iso
Opens the file with name _F_ in mode _M_ (`read`, `write` or
`append`), returning _S_ unified with the stream name.
At most, there are 17 streams opened at the same time. Each stream is
either an input or an output stream but not both. There are always 3
open streams: user_input for reading, user_output for writing
and user_error for writing. If there is no ambiguity, the atoms
user_input and user_output may be referred to as `user`.
The `file_errors` flag controls whether errors are reported when in
mode `read` or `append` the file _F_ does not exist or is not
readable, and whether in mode `write` or `append` the file is not
writable.
*/
static
PRED_IMPL("open", 3, open3, PL_FA_ISO)
{ IOSTREAM *s = openStream(A1, A2, 0);
if ( s )
return PL_unify_stream_or_alias(A3, s);
return FALSE;
}
//! @}
/** @defgroup DEC10_IO DEC-10/C-Prolog Compatible File Handling
*
* @ingroup InputOutput
* @{
*/
/*******************************
* EDINBURGH I/O *
*******************************/
static IOSTREAM *
findStreamFromFile(atom_t name, unsigned int flags)
{ TableEnum e;
Symbol symb;
IOSTREAM *s = NULL;
e = newTableEnum(streamContext);
while( (symb=advanceTableEnum(e)) )
{ stream_context *ctx = symb->value;
if ( ctx->filename == name &&
True(ctx, flags) )
{ s = symb->name;
break;
}
}
freeTableEnum(e);
return s;
}
int
pl_see(term_t f)
{ GET_LD
IOSTREAM *s;
atom_t a;
term_t mode;
if ( !PL_get_atom_ex(f, &a) )
return FALSE;
PL_LOCK(L_SEETELL);
if ( get_stream_handle(a, &s, SH_ALIAS|SH_UNLOCKED) )
{ Scurin = s;
goto ok;
}
if ( a == ATOM_user )
{ Scurin = Suser_input;
goto ok;
}
if ( (s = findStreamFromFile(a, IO_SEE)) )
{ Scurin = s;
goto ok;
}
mode = PL_new_term_ref();
PL_put_atom(mode, ATOM_read);
if ( !(s = openStream(f, mode, 0)) )
{ PL_UNLOCK(L_SEETELL);
return FALSE;
}
set(getStreamContext(s), IO_SEE);
push_input_context(ATOM_see);
Scurin = s;
ok:
PL_UNLOCK(L_SEETELL);
return TRUE;
}
int
pl_seen(void)
{ GET_LD
IOSTREAM *s = getStream(Scurin);
pop_input_context();
if ( s && (s->flags & SIO_NOFEOF) )
return TRUE;
if ( s )
return closeStream(s);
return symbol_no_stream(ATOM_current_input);
}
/** @pred see(+ _S_)
If _S_ is a currently opened input stream then it is assumed to be
the current input stream. If _S_ is an atom it is taken as a
filename. If there is no input stream currently associated with it, then
it is opened for input, and the new input stream thus created becomes
the current input stream. If it is not possible to open the file, an
error occurs. If there is a single opened input stream currently
associated with the file, it becomes the current input stream; if there
are more than one in that condition, then one of them is chosen.
When _S_ is a stream not currently opened for input, an error may be
reported, depending on the state of the `file_errors` flag. If
_S_ is neither a stream nor an atom the predicates just fails.
*/
static
PRED_IMPL("see", 1, see, 0)
{ return pl_see(A1);
}
/** @pred seen
Closes the current input stream (see 6.7.).
*/
static
PRED_IMPL("seen", 0, seen, 0)
{ return pl_seen();
}
/** @pred seeing(- _S_)
The current input stream is unified with _S_.
*/
static
PRED_IMPL("seeing", 1, seeing, 0)
{ PRED_LD
if ( Scurin == Suser_input )
return PL_unify_atom(A1, ATOM_user);
return PL_unify_stream(A1, Scurin);
}
/* MT: Does not create a lock on the stream
*/
static int
do_tell(term_t f, atom_t m)
{ GET_LD
IOSTREAM *s;
atom_t a;
term_t mode;
if ( !PL_get_atom_ex(f, &a) )
return FALSE;
PL_LOCK(L_SEETELL);
if ( get_stream_handle(a, &s, SH_UNLOCKED) )
{ Scurout = s;
goto ok;
}
if ( a == ATOM_user )
{ Scurout = Suser_output;
goto ok;
}
if ( (s = findStreamFromFile(a, IO_TELL)) )
{ Scurout = s;
goto ok;
}
mode = PL_new_term_ref();
PL_put_atom(mode, m);
if ( !(s = openStream(f, mode, 0)) )
{ PL_UNLOCK(L_SEETELL);
return FALSE;
}
set(getStreamContext(s), IO_TELL);
pushOutputContext();
Scurout = s;
ok:
PL_UNLOCK(L_SEETELL);
return TRUE;
}
/** @pred tell(+ _S_)
If _S_ is a currently opened stream for output, it becomes the
current output stream. If _S_ is an atom it is taken to be a
filename. If there is no output stream currently associated with it,
then it is opened for output, and the new output stream created becomes
the current output stream. If it is not possible to open the file, an
error occurs. If there is a single opened output stream currently
associated with the file, then it becomes the current output stream; if
there are more than one in that condition, one of them is chosen.
Whenever _S_ is a stream not currently opened for output, an error
may be reported, depending on the state of the file_errors flag. The
predicate just fails, if _S_ is neither a stream nor an atom.
*/
static
PRED_IMPL("tell", 1, tell, 0)
{ return do_tell(A1, ATOM_write);
}
static
PRED_IMPL("append", 1, append, 0)
{ return do_tell(A1, ATOM_append);
}
/** @pred telling(- _S_)
The current output stream is unified with _S_.
*/
static
PRED_IMPL("telling", 1, telling, 0)
{ PRED_LD
if ( Scurout == Suser_output )
return PL_unify_atom(A1, ATOM_user);
return PL_unify_stream(A1, Scurout);
}
/** @pred told
Closes the current output stream, and the user's terminal becomes again
the current output stream. It is important to remember to close streams
after having finished using them, as the maximum number of
simultaneously opened streams is 17.
*/
static
PRED_IMPL("told", 0, told, 0)
{ PRED_LD
IOSTREAM *s = getStream(Scurout);
popOutputContext();
if ( s && (s->flags & SIO_NOFEOF) )
return TRUE;
if ( s )
return closeStream(s);
return symbol_no_stream(ATOM_current_output);
}
/**
* @}
*/
//! @defgroup Stream Opening and Closing Streams
// @ingroup InputOutput
// @{
//
/*******************************
* NULL-STREAM *
*******************************/
static ssize_t
Swrite_null(void *handle, char *buf, size_t size)
{ (void)handle;
(void)buf;
return size;
}
static ssize_t
Sread_null(void *handle, char *buf, size_t size)
{ (void)handle;
(void)buf;
(void)size;
return 0;
}
static long
Sseek_null(void *handle, long offset, int whence)
{ (void)handle;
switch(whence)
{ case SIO_SEEK_SET:
return offset;
case SIO_SEEK_CUR:
case SIO_SEEK_END:
default:
return -1;
}
}
static int
Sclose_null(void *handle)
{ (void)handle;
return 0;
}
static const IOFUNCTIONS nullFunctions =
{ Sread_null,
Swrite_null,
Sseek_null,
Sclose_null
};
static
PRED_IMPL("open_null_stream", 1, open_null_stream, 0)
{ int sflags = SIO_NBUF|SIO_RECORDPOS|SIO_OUTPUT|SIO_TEXT;
IOSTREAM *s = Snew((void *)NULL, sflags, (IOFUNCTIONS *)&nullFunctions);
if ( s )
{ s->encoding = ENC_UTF8;
return PL_unify_stream_or_alias(A1, s);
}
return FALSE;
}
static int
do_close(IOSTREAM *s, int force)
{ if ( force )
{ if ( !s )
return TRUE;
if ( s == Sinput )
Sclearerr(s);
else if ( s == Soutput || s == Serror )
{ Sflush(s);
Sclearerr(s);
} else
{ Sflush(s);
if ( Sclose(s) < 0 )
PL_clear_exception();
}
return TRUE;
} else if ( s )
{ return closeStream(s);
} else
{ return FALSE;
}
}
static int
pl_close(term_t stream, int force ARG_LD)
{ IOSTREAM *s;
atom_t a;
stream_ref *ref;
PL_blob_t *type;
if ( !PL_get_atom(stream, &a) )
return not_a_stream(stream);
ref = PL_blob_data(a, NULL, &type);
if ( type == &stream_blob )
{ int rc = TRUE;
if ( ref->read )
rc = do_close(getStream(ref->read), force);
if ( ref->write )
rc = rc && do_close(getStream(ref->write), force);
return rc;
}
if ( get_stream_handle(a, &s, SH_ERRORS|SH_ALIAS) )
return do_close(s, force);
return FALSE;
}
/** @pred close(+ _S_) is iso
Closes the stream _S_. If _S_ does not stand for a stream
currently opened an error is reported. The streams user_input,
user_output, and user_error can never be closed.
*/
static
PRED_IMPL("close", 1, close, PL_FA_ISO)
{ PRED_LD
return pl_close(A1, FALSE PASS_LD);
}
static const opt_spec close2_options[] =
{ { ATOM_force, OPT_BOOL },
{ NULL_ATOM, 0 }
};
/** @pred close(+ _S_,+ _O_) is iso
Closes the stream _S_, following options _O_.
The only valid options are `force(true)` and `force(false)`.
YAP currently ignores these options.
*/
static
PRED_IMPL("close", 2, close2, PL_FA_ISO)
{ PRED_LD
int force = FALSE;
if ( !scan_options(A2, 0, ATOM_close_option, close2_options, &force) )
return FALSE;
return pl_close(A1, force PASS_LD);
}
/*******************************
* STREAM-PROPERTY *
*******************************/
static int
stream_file_name_propery(IOSTREAM *s, term_t prop ARG_LD)
{ atom_t name;
for(; s; s=s->downstream)
{ if ( (name = getStreamContext(s)->filename) )
{ return PL_unify_atom(prop, name);
}
}
return FALSE;
}
static int
stream_mode_property(IOSTREAM *s, term_t prop ARG_LD)
{ atom_t mode;
if ( s->flags & SIO_INPUT )
mode = ATOM_read;
else
{ assert(s->flags & SIO_OUTPUT);
if ( s->flags & SIO_APPEND )
mode = ATOM_append;
else if ( s->flags & SIO_UPDATE )
mode = ATOM_update;
else
mode = ATOM_write;
}
return PL_unify_atom(prop, mode);
}
static int
stream_input_prop(IOSTREAM *s ARG_LD)
{ IGNORE_LD
return (s->flags & SIO_INPUT) ? TRUE : FALSE;
}
static int
stream_output_prop(IOSTREAM *s ARG_LD)
{ IGNORE_LD
return (s->flags & SIO_OUTPUT) ? TRUE : FALSE;
}
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Incomplete: should be non-deterministic if the stream has multiple aliases!
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
static int
stream_alias_prop(IOSTREAM *s, term_t prop ARG_LD)
{ atom_t name;
stream_context *ctx = getStreamContext(s);
int i;
if ( PL_get_atom(prop, &name) )
{ alias *a;
for( a = ctx->alias_head; a; a = a->next )
{ if ( a->name == name )
return TRUE;
}
if ( (i=standardStreamIndexFromName(name)) >= 0 &&
i < 6 &&
s == LD->IO.streams[i] )
return TRUE;
return FALSE;
}
if ( (i=standardStreamIndexFromStream(s)) >= 0 && i < 3 )
return PL_unify_atom(prop, standardStreams[i]);
if ( ctx->alias_head )
return PL_unify_atom(prop, ctx->alias_head->name);
return FALSE;
}
static int
stream_position_prop(IOSTREAM *s, term_t prop ARG_LD)
{ IGNORE_LD
if ( s->position )
{ return PL_unify_term(prop,
PL_FUNCTOR, FUNCTOR_stream_position4,
PL_INT64, s->position->charno,
PL_INT, s->position->lineno,
PL_INT, s->position->linepos,
PL_INT64, s->position->byteno);
}
return FALSE;
}
static int
stream_end_of_stream_prop(IOSTREAM *s, term_t prop ARG_LD)
{ if ( s->flags & SIO_INPUT )
{ atom_t val;
if ( s->flags & SIO_FEOF2 )
val = ATOM_past;
else if ( s->flags & SIO_FEOF )
val = ATOM_at;
else
val = ATOM_not;
return PL_unify_atom(prop, val);
}
return FALSE;
}
static int
stream_eof_action_prop(IOSTREAM *s, term_t prop ARG_LD)
{ atom_t val;
if ( s->flags & SIO_NOFEOF )
val = ATOM_reset;
else if ( s->flags & SIO_FEOF2ERR )
val = ATOM_error;
else
val = ATOM_eof_code;
return PL_unify_atom(prop, val);
}
#ifdef HAVE_FSTAT
#include <sys/stat.h>
#endif
#if !defined(S_ISREG) && defined(S_IFREG)
#define S_ISREG(m) ((m&S_IFMT) == S_IFREG)
#endif
static int
stream_reposition_prop(IOSTREAM *s, term_t prop ARG_LD)
{ atom_t val;
if ( s->functions->seek )
{
#ifdef HAVE_FSTAT
int fd = Sfileno(s);
struct stat buf;
if ( fd != -1 && fstat(fd, &buf) == 0 && S_ISREG(buf.st_mode) )
val = ATOM_true;
else
val = ATOM_false;
#else
val = ATOM_true;
#endif
} else
val = ATOM_false;
return PL_unify_atom(prop, val);
}
static int
stream_close_on_abort_prop(IOSTREAM *s, term_t prop ARG_LD)
{ IGNORE_LD
return PL_unify_bool_ex(prop, !(s->flags & SIO_NOCLOSE));
}
static int
stream_type_prop(IOSTREAM *s, term_t prop ARG_LD)
{ return PL_unify_atom(prop, s->flags & SIO_TEXT ? ATOM_text : ATOM_binary);
}
static int
stream_file_no_prop(IOSTREAM *s, term_t prop ARG_LD)
{ int fd;
if ( (fd = Sfileno(s)) >= 0 )
return PL_unify_integer(prop, fd);
return FALSE;
}
static int
stream_tty_prop(IOSTREAM *s, term_t prop ARG_LD)
{ IGNORE_LD
if ( (s->flags & SIO_ISATTY) )
return PL_unify_bool_ex(prop, TRUE);
return FALSE;
}
static int
stream_bom_prop(IOSTREAM *s, term_t prop ARG_LD)
{ IGNORE_LD
if ( (s->flags & SIO_BOM) )
return PL_unify_bool_ex(prop, TRUE);
return FALSE;
}
static int
stream_newline_prop(IOSTREAM *s, term_t prop ARG_LD)
{ switch ( s->newline )
{ case SIO_NL_POSIX:
case SIO_NL_DETECT:
return PL_unify_atom(prop, ATOM_posix);
case SIO_NL_DOS:
return PL_unify_atom(prop, ATOM_dos);
}
return FALSE;
}
static int
stream_encoding_prop(IOSTREAM *s, term_t prop ARG_LD)
{ return PL_unify_atom(prop, encoding_to_atom(s->encoding));
}
#ifdef O_LOCALE
static int
stream_locale_prop(IOSTREAM *s, term_t prop ARG_LD)
{ if ( s->locale )
return unifyLocale(prop, s->locale, TRUE);
return FALSE;
}
#endif
static int
stream_reperror_prop(IOSTREAM *s, term_t prop ARG_LD)
{ atom_t a;
if ( (s->flags & SIO_REPXML) )
a = ATOM_xml;
else if ( (s->flags & SIO_REPPL) )
a = ATOM_prolog;
else
a = ATOM_error;
return PL_unify_atom(prop, a);
}
static int
stream_buffer_prop(IOSTREAM *s, term_t prop ARG_LD)
{ atom_t b;
if ( s->flags & SIO_FBUF )
b = ATOM_full;
else if ( s->flags & SIO_LBUF )
b = ATOM_line;
else /*if ( s->flags & SIO_NBUF )*/
b = ATOM_false;
return PL_unify_atom(prop, b);
}
static int
stream_buffer_size_prop(IOSTREAM *s, term_t prop ARG_LD)
{ if ( (s->flags & SIO_NBUF) )
return FALSE;
return PL_unify_integer(prop, s->bufsize);
}
static int
stream_timeout_prop(IOSTREAM *s, term_t prop ARG_LD)
{ if ( s->timeout == -1 )
return PL_unify_atom(prop, ATOM_infinite);
return PL_unify_float(prop, (double)s->timeout/1000.0);
}
static int
stream_nlink_prop(IOSTREAM *s, term_t prop ARG_LD)
{ int fd;
if ( (fd = Sfileno(s)) >= 0 )
{ struct stat buf;
if ( fstat(fd, &buf) == 0 )
{ return PL_unify_integer(prop, buf.st_nlink);
}
}
return FALSE;
}
static int
stream_close_on_exec_prop(IOSTREAM *s, term_t prop ARG_LD)
{ int fd;
#ifdef __WINDOWS__
DWORD Flags;
#else
int fd_flags;
#endif
IGNORE_LD
if ( (fd = Sfileno(s)) < 0)
return FALSE;
#if defined(F_GETFD) && defined(FD_CLOEXEC)
if ( (fd_flags = fcntl(fd, F_GETFD)) == -1)
return FALSE;
return PL_unify_bool_ex(prop, (fd_flags&FD_CLOEXEC) != 0 );
#elif defined __WINDOWS__
if ( GetHandleInformation((HANDLE)_get_osfhandle(fd), &Flags) == 0 )
return FALSE;
return PL_unify_bool_ex(prop, (Flags & HANDLE_FLAG_INHERIT) == 0);
#endif
return FALSE;
}
typedef struct
{ functor_t functor; /* functor of property */
property_t function; /* function to generate */
} sprop;
static const sprop sprop_list [] =
{ { FUNCTOR_file_name1, stream_file_name_propery },
{ FUNCTOR_mode1, stream_mode_property },
{ FUNCTOR_input0, (property_t)stream_input_prop },
{ FUNCTOR_output0, (property_t)stream_output_prop },
{ FUNCTOR_alias1, stream_alias_prop },
{ FUNCTOR_position1, stream_position_prop },
{ FUNCTOR_end_of_stream1, stream_end_of_stream_prop },
{ FUNCTOR_eof_action1, stream_eof_action_prop },
{ FUNCTOR_reposition1, stream_reposition_prop },
{ FUNCTOR_type1, stream_type_prop },
{ FUNCTOR_file_no1, stream_file_no_prop },
{ FUNCTOR_buffer1, stream_buffer_prop },
{ FUNCTOR_buffer_size1, stream_buffer_size_prop },
{ FUNCTOR_close_on_abort1,stream_close_on_abort_prop },
{ FUNCTOR_tty1, stream_tty_prop },
{ FUNCTOR_encoding1, stream_encoding_prop },
#ifdef O_LOCALE
{ FUNCTOR_locale1, stream_locale_prop },
#endif
{ FUNCTOR_bom1, stream_bom_prop },
{ FUNCTOR_newline1, stream_newline_prop },
{ FUNCTOR_representation_errors1, stream_reperror_prop },
{ FUNCTOR_timeout1, stream_timeout_prop },
{ FUNCTOR_nlink1, stream_nlink_prop },
{ FUNCTOR_close_on_exec1, stream_close_on_exec_prop },
{ 0, NULL }
};
typedef struct
{ TableEnum e; /* Enumerator on stream-table */
IOSTREAM *s; /* Stream we are enumerating */
const sprop *p; /* Pointer in properties */
int fixed_p; /* Propety is given */
} prop_enum;
/** @pred stream_property(? _Stream_,? _Prop_) is iso
Obtain the properties for the open streams. If the first argument is
unbound, the procedure will backtrack through all open
streams. Otherwise, the first argument must be a stream term (you may
use `current_stream` to obtain a current stream given a file name).
The following properties are recognized:
+ file_name( _P_)
An atom giving the file name for the current stream. The file names are
user_input, user_output, and user_error for the
standard streams.
+ mode( _P_)
The mode used to open the file. It may be one of `append`,
`read`, or `write`.
+ input
The stream is readable.
+ output
The stream is writable.
+ alias( _A_)
ISO-Prolog primitive for stream aliases. <tt>YAP</tt> returns one of the
existing aliases for the stream.
+ position( _P_)
A term describing the position in the stream.
+ end_of_stream( _E_)
Whether the stream is `at` the end of stream, or it has found the
end of stream and is `past`, or whether it has `not` yet
reached the end of stream.
+ eof_action( _A_)
The action to take when trying to read after reaching the end of
stream. The action may be one of `error`, generate an error,
`eof_code`, return character code `-1`, or `reset` the
stream.
+ reposition( _B_)
Whether the stream can be repositioned or not, that is, whether it is
seekable.
+ type( _T_)
Whether the stream is a `text` stream or a `binary` stream.
+ bom(+ _Bool_)
If present and `true`, a BOM (<em>Byte Order Mark</em>) was
detected while opening the file for reading or a BOM was written while
opening the stream. See BOM for details.
+ encoding(+ _Encoding_)
Query the encoding used for text. See Encoding for an
overview of wide character and encoding issues in YAP.
+ representation_errors(+ _Mode_)
Behaviour when writing characters to the stream that cannot be
represented by the encoding. The behaviour is one of `error`
(throw and Input/Output error exception), `prolog` (write `\u...\`
escape code or `xml` (write `\&#...;` XML character entity).
The initial mode is `prolog` for the user streams and
`error` for all other streams. See also Encoding and
`open/4`.
+ current_line_number(- _LineNumber_)
Unify _LineNumber_ with the line number for the current stream.
*/
static
PRED_IMPL("stream_property", 2, stream_property,
PL_FA_ISO|PL_FA_NONDETERMINISTIC)
{ PRED_LD
IOSTREAM *s;
prop_enum *pe;
fid_t fid;
term_t a1;
atom_t a;
term_t stream = A1;
term_t property = A2;
switch( CTX_CNTRL )
{ case FRG_FIRST_CALL:
a1 = PL_new_term_ref();
if ( PL_is_variable(stream) ) /* generate */
{ const sprop *p = sprop_list;
int fixed = FALSE;
functor_t f;
if ( PL_get_functor(property, &f) ) /* test for defined property */
{ for( ; p->functor; p++ )
{ if ( f == p->functor )
{ fixed = TRUE;
break;
}
}
if ( !p->functor )
return PL_error(NULL, 0, NULL, ERR_DOMAIN,
ATOM_stream_property, property);
}
pe = allocForeignState(sizeof(*pe));
pe->e = newTableEnum(streamContext);
pe->s = NULL;
pe->p = p;
pe->fixed_p = fixed;
break;
}
if ( !PL_get_atom(stream, &a) )
return not_a_stream(stream);
LOCK(); /* given stream */
if ( get_stream_handle(a, &s, SH_ERRORS|SH_UNLOCKED) )
{ functor_t f;
if ( PL_is_variable(property) ) /* generate properties */
{ pe = allocForeignState(sizeof(*pe));
pe->e = NULL;
pe->s = s;
pe->p = sprop_list;
pe->fixed_p = FALSE;
UNLOCK();
break;
}
if ( PL_get_functor(property, &f) )
{ const sprop *p = sprop_list;
for( ; p->functor; p++ )
{ if ( f == p->functor )
{ int rval;
switch(arityFunctor(f))
{ case 0:
rval = (*(property0_t)p->function)(s PASS_LD);
break;
case 1:
{ term_t a1 = PL_new_term_ref();
_PL_get_arg(1, property, a1);
rval = (*p->function)(s, a1 PASS_LD);
break;
}
default:
assert(0);
rval = FALSE;
}
UNLOCK();
return rval;
}
}
} else
{ UNLOCK();
return PL_error(NULL, 0, NULL, ERR_DOMAIN,
ATOM_stream_property, property);
}
}
UNLOCK();
return FALSE; /* bad stream handle */
case FRG_REDO:
{ pe = CTX_PTR;
a1 = PL_new_term_ref();
break;
}
case FRG_CUTTED:
{ pe = CTX_PTR;
if ( pe ) /* 0 if exception on FRG_FIRST_CALL */
{ if ( pe->e )
freeTableEnum(pe->e);
freeForeignState(pe, sizeof(*pe));
}
return TRUE;
}
default:
assert(0);
return FALSE;
}
if ( !(fid = PL_open_foreign_frame()) )
{ error:
if ( pe->e )
freeTableEnum(pe->e);
freeForeignState(pe, sizeof(*pe));
return FALSE;
}
for(;;)
{ if ( pe->s ) /* given stream */
{ fid_t fid2;
if ( PL_is_variable(stream) )
{ if ( !PL_unify_stream(stream, pe->s) )
goto enum_e;
}
if ( !(fid2 = PL_open_foreign_frame()) )
goto error;
for( ; pe->p->functor ; pe->p++ )
{ if ( PL_unify_functor(property, pe->p->functor) )
{ int rval;
switch(arityFunctor(pe->p->functor))
{ case 0:
rval = (*(property0_t)pe->p->function)(pe->s PASS_LD);
break;
case 1:
{ _PL_get_arg(1, property, a1);
rval = (*pe->p->function)(pe->s, a1 PASS_LD);
break;
}
default:
assert(0);
rval = FALSE;
}
if ( rval )
{ if ( pe->fixed_p )
pe->s = NULL;
else
pe->p++;
ForeignRedoPtr(pe);
}
}
if ( exception_term )
goto error;
if ( pe->fixed_p )
break;
PL_rewind_foreign_frame(fid2);
}
PL_close_foreign_frame(fid2);
pe->s = NULL;
}
enum_e:
if ( pe->e )
{ Symbol symb;
while ( (symb=advanceTableEnum(pe->e)) )
{ PL_rewind_foreign_frame(fid);
if ( PL_unify_stream(stream, symb->name) )
{ pe->s = symb->name;
if ( !pe->fixed_p )
pe->p = sprop_list;
break;
}
if ( exception_term )
goto error;
}
}
if ( !pe->s )
{ if ( pe->e )
freeTableEnum(pe->e);
freeForeignState(pe, sizeof(*pe));
return FALSE;
}
}
return FALSE;
}
/** @pred is_stream( _S_)
Succeeds if _S_ is a currently open stream.
*/
static
PRED_IMPL("is_stream", 1, is_stream, 0)
{ GET_LD
IOSTREAM *s;
atom_t a;
if ( PL_get_atom(A1, &a) &&
get_stream_handle(a, &s, SH_UNLOCKED) )
return TRUE;
return FALSE;
}
/*******************************
* FLUSH *
*******************************/
/**
* @}
*/
/**
* @ingroup StreamM
* @{
*/
static int
flush_output(term_t out ARG_LD)
{ IOSTREAM *s;
if ( getOutputStream(out, S_DONTCARE, &s) )
{ Sflush(s);
return streamStatus(s);
}
return FALSE;
}
/** @pred flush_output is iso
Send out all data in the output buffer of the current output stream.
*/
static
PRED_IMPL("flush_output", 0, flush_output, PL_FA_ISO)
{ PRED_LD
return flush_output(0 PASS_LD);
}
/** @pred flush_output(+ _S_) is iso
Send all data in the output buffer for stream _S_.
*/
static
PRED_IMPL("flush_output", 1, flush_output1, PL_FA_ISO)
{ PRED_LD
return flush_output(A1 PASS_LD);
}
/**
* @}
*/
/**
* @ingroup Stream
* @{
*/
static int
getStreamWithPosition(term_t stream, IOSTREAM **sp)
{ IOSTREAM *s;
if ( PL_get_stream_handle(stream, &s) )
{ if ( !s->position )
{ PL_error(NULL, 0, NULL, ERR_PERMISSION, /* non-ISO */
ATOM_property, ATOM_position, stream);
releaseStream(s);
return FALSE;
}
*sp = s;
return TRUE;
}
return FALSE;
}
static int
getRepositionableStream(term_t stream, IOSTREAM **sp)
{ GET_LD
IOSTREAM *s;
atom_t a;
if ( !PL_get_atom(stream, &a) )
return not_a_stream(stream);
if ( get_stream_handle(a, &s, SH_ERRORS) )
{ if ( !s->position || !s->functions || !s->functions->seek )
{ PL_error(NULL, 0, NULL, ERR_PERMISSION,
ATOM_reposition, ATOM_stream, stream);
releaseStream(s);
return FALSE;
}
*sp = s;
return TRUE;
}
return FALSE;
}
/** @pred set_stream_position(+ _S_, + _POS_) is iso
Given a stream position _POS_ for a stream _S_, set the current
stream position for _S_ to be _POS_.
*/
static
PRED_IMPL("set_stream_position", 2, set_stream_position, PL_FA_ISO)
{ PRED_LD
IOSTREAM *s = NULL; /* make compiler happy */
int64_t charno, byteno;
long linepos, lineno;
term_t a = PL_new_term_ref();
term_t stream = A1;
term_t pos = A2;
if ( !(getRepositionableStream(stream, &s)) )
return FALSE;
if ( !PL_is_functor(pos, FUNCTOR_stream_position4) ||
!PL_get_arg(1, pos, a) ||
!PL_get_int64(a, &charno) ||
!PL_get_arg(2, pos, a) ||
!PL_get_long(a, &lineno) ||
!PL_get_arg(3, pos, a) ||
!PL_get_long(a, &linepos) ||
!PL_get_arg(4, pos, a) ||
!PL_get_int64(a, &byteno) )
{ releaseStream(s);
return PL_error("stream_position", 3, NULL,
ERR_DOMAIN, ATOM_stream_position, pos);
}
if ( Sseek64(s, byteno, SIO_SEEK_SET) != 0 )
return PL_error(NULL, 0, MSG_ERRNO, ERR_FILE_OPERATION,
ATOM_reposition, ATOM_stream, stream);
s->position->byteno = byteno;
s->position->charno = charno;
s->position->lineno = (int)lineno;
s->position->linepos = (int)linepos;
releaseStream(s);
return TRUE;
}
static
PRED_IMPL("seek", 4, seek, 0)
{ PRED_LD
atom_t m;
int whence = -1;
int64_t off, new;
IOSTREAM *s;
term_t stream = A1;
term_t offset = A2;
term_t method = A3;
term_t newloc = A4;
if ( !(PL_get_atom_ex(method, &m)) )
return FALSE;
if ( m == ATOM_bof )
whence = SIO_SEEK_SET;
else if ( m == ATOM_current )
whence = SIO_SEEK_CUR;
else if ( m == ATOM_eof )
whence = SIO_SEEK_END;
else
return PL_error("seek", 4, NULL, ERR_DOMAIN, ATOM_seek_method, method);
if ( !PL_get_int64(offset, &off) )
return PL_error("seek", 4, NULL, ERR_DOMAIN, ATOM_integer, offset);
if ( PL_get_stream_handle(stream, &s) )
{ int unit = Sunit_size(s);
off *= unit;
if ( Sseek64(s, off, whence) < 0 )
{ if ( errno == EINVAL )
PL_error("seek", 4, "offset out of range", ERR_DOMAIN,
ATOM_position, offset);
else
PL_error("seek", 4, OsError(), ERR_PERMISSION,
ATOM_reposition, ATOM_stream, stream);
Sclearerr(s);
releaseStream(s);
return FALSE;
}
new = Stell64(s);
releaseStream(s);
new /= unit;
return PL_unify_int64(newloc, new);
}
return FALSE;
}
/** @pred set_input(+ _S_) is iso
Set stream _S_ as the current input stream. Predicates like read/1
and get/1 will start using stream _S_.
*/
static
PRED_IMPL("set_input", 1, set_input, PL_FA_ISO)
{ PRED_LD
IOSTREAM *s;
if ( getInputStream(A1, S_DONTCARE, &s) )
{ Scurin = s;
releaseStream(s);
return TRUE;
}
return FALSE;
}
/** @pred set_output(+ _S_) is iso
Set stream _S_ as the current output stream. Predicates like
write/1 and put/1 will start using stream _S_.
*/
static
PRED_IMPL("set_output", 1, set_output, PL_FA_ISO)
{ PRED_LD
IOSTREAM *s;
if ( getOutputStream(A1, S_DONTCARE, &s) )
{ Scurout = s;
releaseStream(s);
return TRUE;
}
return FALSE;
}
/** @pred current_input(- _S_) is iso
Unify _S_ with the current input stream.
*/
static
PRED_IMPL("current_input", 1, current_input, PL_FA_ISO)
{ PRED_LD
return PL_unify_stream(A1, Scurin);
}
/** @pred current_output(- _S_) is iso
Unify _S_ with the current output stream.
*/
static
PRED_IMPL("current_output", 1, current_output, PL_FA_ISO)
{ PRED_LD
return PL_unify_stream(A1, Scurout);
}
/** @pred character_count(+ _Stream_,- _ByteCount_)
Unify _CharacterCount_ with the number of bytes written to or
read from _Stream_.
*/
static
PRED_IMPL("byte_count", 2, byte_count, 0)
{ PRED_LD
IOSTREAM *s;
if ( getStreamWithPosition(A1, &s) )
{ int64_t n = s->position->byteno;
releaseStream(s);
return PL_unify_int64(A2, n);
}
return FALSE;
}
/** @pred character_count(+ _Stream_,- _CharacterCount_)
Unify _CharacterCount_ with the number of characters written to or
read from _Stream_.
*/
static
PRED_IMPL("character_count", 2, character_count, 0)
{ PRED_LD
IOSTREAM *s;
if ( getStreamWithPosition(A1, &s) )
{ int64_t n = s->position->charno;
releaseStream(s);
return PL_unify_int64(A2, n);
}
return FALSE;
}
/** @pred line_count(+ _Stream_,- _LineNumber_)
Unify _LineNumber_ with the line number for the _Stream_.
*/
static
PRED_IMPL("line_count", 2, line_count, 0)
{ GET_LD
IOSTREAM *s;
if ( getStreamWithPosition(A1, &s) )
{ intptr_t n = s->position->lineno;
releaseStream(s);
return PL_unify_integer(A2, n);
}
return FALSE;
}
/** @pred line_position(+ _Stream_,- _LinePosition_)
Unify _LinePosition_ with the position on current text stream
_Stream_.
*/
static
PRED_IMPL("line_position", 2, line_position, 0)
{ GET_LD
IOSTREAM *s;
if ( getStreamWithPosition(A1, &s) )
{ intptr_t n = s->position->linepos;
releaseStream(s);
return PL_unify_integer(A2, n);
}
return FALSE;
}
static
PRED_IMPL("source_location", 2, source_location, 0)
{ PRED_LD
if ( ReadingSource &&
PL_unify_atom(A1, source_file_name) &&
PL_unify_integer(A2, source_line_no) )
return TRUE;
return FALSE;
}
static int
at_end_of_stream(term_t stream ARG_LD)
{ IOSTREAM *s;
if ( getInputStream(stream, S_DONTCARE, &s) )
{ int rval = Sfeof(s);
if ( rval < 0 )
{ PL_error(NULL, 0, "not-buffered stream", ERR_PERMISSION,
ATOM_end_of_stream, ATOM_stream, stream);
rval = FALSE;
}
if ( rval && Sferror(s) ) /* due to error */
return streamStatus(s);
else
releaseStream(s);
return rval;
}
return FALSE; /* exception */
}
/** @pred at_end_of_stream(+ _S_) is iso
Succeed if the stream _S_ has stream position end-of-stream or
past-end-of-stream. Note that _S_ must be a readable stream.
*/
static
PRED_IMPL("at_end_of_stream", 1, at_end_of_stream, PL_FA_ISO)
{ PRED_LD
return at_end_of_stream(A1 PASS_LD);
}
/** @pred at_end_of_stream is iso
Succeed if the current stream has stream position end-of-stream or
past-end-of-stream.
*/
static
PRED_IMPL("at_end_of_stream", 0, at_end_of_stream0, PL_FA_ISO)
{ PRED_LD
return at_end_of_stream(0 PASS_LD);
}
static foreign_t
peek(term_t stream, term_t chr, int how ARG_LD)
{ IOSTREAM *s;
int c;
if ( !getInputStream(stream, how == PL_BYTE ? S_BINARY : S_TEXT, &s) )
return FALSE;
if ( True(s, SIO_NBUF) || (s->bufsize && s->bufsize < PL_MB_LEN_MAX) )
{ releaseStream(s);
return PL_error(NULL, 0, "stream is unbuffered", ERR_PERMISSION,
ATOM_peek, ATOM_stream, stream);
}
if ( how == PL_BYTE )
{ IOPOS pos = s->posbuf;
c = Sgetc(s);
if ( c != EOF ){
Sungetc(c, s);
}
s->posbuf = pos;
} else {
c = Speekcode(s);
}
if ( Sferror(s) )
return streamStatus(s);
releaseStream(s);
return PL_unify_char(chr, c, how);
}
/**
* @}
*/
/**
* @ingroup CharsIO
* @{
*/
/** @pred peek_byte(+ _S_,- _C_) is iso
If _C_ is unbound, or is a character code, and _S_ is a binary
stream, read the next byte from the current stream and unify its code
with _C_, while leaving the current stream position unaltered.
*/
static
PRED_IMPL("peek_byte", 2, peek_byte2, 0)
{ PRED_LD
return peek(A1, A2, PL_BYTE PASS_LD);
}
/** @pred peek_byte(- _C_) is iso
If _C_ is unbound, or is a character code, and the current stream is a
binary stream, read the next byte from the current stream and unify its
code with _C_, while leaving the current stream position unaltered.
*/
static
PRED_IMPL("peek_byte", 1, peek_byte1, 0)
{ PRED_LD
return peek(0, A1, PL_BYTE PASS_LD);
}
/** @pred peek_code(+ _S_,- _C_) is iso
If _C_ is unbound, or is an atom representation of a character, and
the stream _S_ is a text stream, read the next character from that
stream and unify its representation as an atom with _C_, while leaving
the current stream position unaltered.
*/
static
PRED_IMPL("peek_code", 2, peek_code2, 0)
{ PRED_LD
return peek(A1, A2, PL_CODE PASS_LD);
}
/** @pred peek_code(+ _S_,- _C_) is iso
If _C_ is unbound, or is an atom representation of a character, and
the stream _S_ is a text stream, read the next character from that
stream and unify its representation as an atom with _C_, while leaving
the current stream position unaltered.
*/
static
PRED_IMPL("peek_code", 1, peek_code1, 0)
{ PRED_LD
return peek(0, A1, PL_CODE PASS_LD);
}
/** @pred peek_char(+ _S_,- _C_) is iso
If _C_ is unbound, or is an atom representation of a character, and
the stream _S_ is a text stream, read the next character from that
stream and unify its representation as an atom with _C_, while leaving
the current stream position unaltered.
*/
static
PRED_IMPL("peek_char", 2, peek_char2, 0)
{ PRED_LD
return peek(A1, A2, PL_CHAR PASS_LD);
}
/** @pred peek_char(- _C_) is iso
If _C_ is unbound, or is an atom representation of a character, and
the current stream is a text stream, read the next character from the
current stream and unify its atom representation with _C_, while
leaving the current stream position unaltered.
*/
static
PRED_IMPL("peek_char", 1, peek_char1, 0)
{ PRED_LD
return peek(0, A1, PL_CHAR PASS_LD);
}
/**
* @}
*/
/**
* @ingroup StreamM
* @{
*/
/*******************************
* INTERACTION *
*******************************/
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
set_prolog_IO(+In, +Out, +Error)
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
typedef struct wrappedIO
{ void *wrapped_handle; /* original handle */
IOFUNCTIONS *wrapped_functions; /* original functions */
IOSTREAM *wrapped_stream; /* stream we wrapped */
IOFUNCTIONS functions; /* new function block */
} wrappedIO;
ssize_t
Sread_user(void *handle, char *buf, size_t size)
{ GET_LD
wrappedIO *wio = handle;
ssize_t rc;
if ( LD->prompt.next && ttymode != TTY_RAW )
PL_write_prompt(TRUE);
else
Sflush(Suser_output);
rc = (*wio->wrapped_functions->read)(wio->wrapped_handle, buf, size);
if ( rc == 0 ) /* end-of-file */
{ Sclearerr(Suser_input);
LD->prompt.next = TRUE;
} else if ( rc == 1 && buf[0] == 04 )
{ rc = 0; /* Map ^D to end-of-file */
} else if ( rc > 0 && buf[rc-1] == '\n' )
LD->prompt.next = TRUE;
return rc;
}
static int
closeWrappedIO(void *handle)
{ wrappedIO *wio = handle;
int rval;
if ( wio->wrapped_functions->close )
rval = (*wio->wrapped_functions->close)(wio->wrapped_handle);
else
rval = 0;
wio->wrapped_stream->functions = wio->wrapped_functions;
wio->wrapped_stream->handle = wio->wrapped_handle;
PL_free(wio);
return rval;
}
static void
wrapIO(IOSTREAM *s,
ssize_t (*read)(void *, char *, size_t),
ssize_t (*write)(void *, char *, size_t))
{ wrappedIO *wio = PL_malloc(sizeof(*wio));
wio->wrapped_functions = s->functions;
wio->wrapped_handle = s->handle;
wio->wrapped_stream = s;
wio->functions = *s->functions;
if ( read ) wio->functions.read = read;
if ( write ) wio->functions.write = write;
wio->functions.close = closeWrappedIO;
s->functions = &wio->functions;
s->handle = wio;
}
static
PRED_IMPL("set_prolog_IO", 3, set_prolog_IO, 0)
{ PRED_LD
IOSTREAM *in = NULL, *out = NULL, *error = NULL;
int rval = FALSE;
int wrapin = FALSE;
int i;
if ( !term_stream_handle(A1, &in, SH_ERRORS|SH_ALIAS|SH_UNLOCKED PASS_LD) )
goto out;
wrapin = (LD->IO.streams[0] != in);
if ( wrapin )
{ if ( !(in = getStream(in)) ) /* lock it */
goto out;
}
if ( !term_stream_handle(A2, &out, SH_ERRORS|SH_ALIAS PASS_LD) )
goto out;
if ( PL_compare(A2, A3) == 0 ) /* == */
{ error = getStream(Snew(out->handle, out->flags, out->functions));
if ( !error )
goto out;
error->flags &= ~SIO_ABUF; /* disable buffering */
error->flags |= SIO_NBUF;
} else
{ if ( !PL_get_stream_handle(A3, &error) )
goto out;
}
LOCK();
out->flags &= ~SIO_ABUF; /* output: line buffered */
out->flags |= SIO_LBUF;
LD->IO.streams[1] = out; /* user_output */
LD->IO.streams[2] = error; /* user_error */
LD->IO.streams[4] = out; /* current_output */
if ( wrapin )
{ LD->IO.streams[3] = in; /* current_input */
LD->IO.streams[0] = in; /* user_input */
wrapIO(in, Sread_user, NULL);
LD->prompt.next = TRUE;
}
for(i=0; i<3; i++)
{ LD->IO.streams[i]->position = &LD->IO.streams[0]->posbuf;
LD->IO.streams[i]->flags |= SIO_RECORDPOS;
}
UNLOCK();
rval = TRUE;
out:
if ( wrapin && in )
releaseStream(in);
if ( out )
releaseStream(out);
if ( error && error != out )
releaseStream(error);
return rval;
}
static
PRED_IMPL("$size_stream", 2, size_stream, 0)
{ GET_LD
IOSTREAM *s;
int rval;
if ( !PL_get_stream_handle(A1, &s) )
return FALSE;
rval = PL_unify_int64(A2, Ssize(s));
PL_release_stream(s);
return rval;
}
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
copy_stream_data(+StreamIn, +StreamOut, [Len])
Copy all data from StreamIn to StreamOut. Should be somewhere else,
and maybe we need something else to copy resources.
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
static int
copy_stream_data(term_t in, term_t out, term_t len ARG_LD)
{ IOSTREAM *i, *o;
int c;
int count = 0;
if ( !getInputStream(in, S_DONTCARE, &i) )
return FALSE;
if ( !getOutputStream(out, S_DONTCARE, &o) )
{ releaseStream(i);
return FALSE;
}
if ( !len )
{ while ( (c = Sgetcode(i)) != EOF )
{ if ( (++count % 4096) == 0 && PL_handle_signals() < 0 )
{ releaseStream(i);
releaseStream(o);
return FALSE;
}
if ( Sputcode(c, o) < 0 )
{ releaseStream(i);
return streamStatus(o);
}
}
} else
{ int64_t n;
if ( !PL_get_int64_ex(len, &n) )
return FALSE;
while ( n-- > 0 && (c = Sgetcode(i)) != EOF )
{ if ( (++count % 4096) == 0 && PL_handle_signals() < 0 )
{ releaseStream(i);
releaseStream(o);
return FALSE;
}
if ( Sputcode(c, o) < 0 )
{ releaseStream(i);
return streamStatus(o);
}
}
}
releaseStream(o);
return streamStatus(i);
}
/** @pred copy_stream_data( +_Source_, +_Output_, +_Len_)
*
* Copy at most _Len_ characters from stream _Source_ to stream _Output_.
*/
static
PRED_IMPL("copy_stream_data", 3, copy_stream_data3, 0)
{ PRED_LD
return copy_stream_data(A1, A2, A3 PASS_LD);
}
/** @pred copy_stream_data( +_Source_, +_Output_)
*
* Copy all the data left in _Source_ to stream _Output_.
*/
static
PRED_IMPL("copy_stream_data", 2, copy_stream_data2, 0)
{ PRED_LD
return copy_stream_data(A1, A2, 0 PASS_LD);
}
/**
* @}
*/
/*******************************
* PUBLISH PREDICATES *
*******************************/
BeginPredDefs(file)
/* ISO IO */
PRED_DEF("open", 4, open4, PL_FA_ISO)
PRED_DEF("open", 3, open3, PL_FA_ISO)
PRED_DEF("close", 1, close, PL_FA_ISO)
PRED_DEF("close", 2, close2, PL_FA_ISO)
PRED_DEF("set_input", 1, set_input, PL_FA_ISO)
PRED_DEF("set_output", 1, set_output, PL_FA_ISO)
PRED_DEF("current_input", 1, current_input, PL_FA_ISO)
PRED_DEF("current_output", 1, current_output, PL_FA_ISO)
PRED_DEF("get_code", 2, get_code2, PL_FA_ISO)
PRED_DEF("get_code", 1, get_code1, PL_FA_ISO)
PRED_DEF("get_char", 2, get_char2, PL_FA_ISO)
PRED_DEF("get_char", 1, get_char1, PL_FA_ISO)
PRED_DEF("get_byte", 2, get_byte2, PL_FA_ISO)
PRED_DEF("get_byte", 1, get_byte1, PL_FA_ISO)
PRED_DEF("peek_code", 2, peek_code2, PL_FA_ISO)
PRED_DEF("peek_code", 1, peek_code1, PL_FA_ISO)
PRED_DEF("peek_char", 2, peek_char2, PL_FA_ISO)
PRED_DEF("peek_char", 1, peek_char1, PL_FA_ISO)
PRED_DEF("peek_byte", 2, peek_byte2, PL_FA_ISO)
PRED_DEF("peek_byte", 1, peek_byte1, PL_FA_ISO)
PRED_DEF("put_byte", 2, put_byte2, PL_FA_ISO)
PRED_DEF("put_byte", 1, put_byte1, PL_FA_ISO)
PRED_DEF("put_code", 2, put_code2, PL_FA_ISO)
PRED_DEF("put_code", 1, put_code1, PL_FA_ISO)
PRED_DEF("put_char", 2, put_code2, PL_FA_ISO)
PRED_DEF("put_char", 1, put_code1, PL_FA_ISO)
PRED_DEF("flush_output", 0, flush_output, PL_FA_ISO)
PRED_DEF("flush_output", 1, flush_output1, PL_FA_ISO)
PRED_DEF("at_end_of_stream", 1, at_end_of_stream, PL_FA_ISO)
PRED_DEF("at_end_of_stream", 0, at_end_of_stream0, PL_FA_ISO)
PRED_DEF("stream_property", 2, stream_property,
PL_FA_ISO|PL_FA_NONDETERMINISTIC)
PRED_DEF("set_stream_position", 2, set_stream_position, PL_FA_ISO)
/* edinburgh IO */
PRED_DEF("see", 1, see, 0)
PRED_DEF("seen", 0, seen, 0)
PRED_DEF("seeing", 1, seeing, 0)
PRED_DEF("tell", 1, tell, 0)
PRED_DEF("append", 1, append, 0)
PRED_DEF("told", 0, told, 0)
PRED_DEF("telling", 1, telling, 0)
PRED_DEF("put", 2, put2, 0)
PRED_DEF("put", 1, put1, 0)
PRED_DEF("skip", 1, skip1, 0)
PRED_DEF("skip", 2, skip2, 0)
PRED_DEF("get", 1, get1, 0)
PRED_DEF("get", 2, get2, 0)
PRED_DEF("get0", 2, get_code2, 0)
PRED_DEF("get0", 1, get_code1, 0)
PRED_DEF("ttyflush", 0, ttyflush, 0)
PRED_DEF("prompt", 2, prompt, 0)
PRED_DEF("tab", 2, tab2, 0)
PRED_DEF("tab", 1, tab1, 0)
/* Quintus IO */
PRED_DEF("byte_count", 2, byte_count, 0)
PRED_DEF("character_count", 2, character_count, 0)
PRED_DEF("line_count", 2, line_count, 0)
PRED_DEF("line_position", 2, line_position, 0)
PRED_DEF("open_null_stream", 1, open_null_stream, 0)
/* SWI specific */
PRED_DEF("is_stream", 1, is_stream, 0)
PRED_DEF("set_stream", 2, set_stream, 0)
PRED_DEF("with_output_to", 2, with_output_to, PL_FA_TRANSPARENT)
PRED_DEF("set_prolog_IO", 3, set_prolog_IO, 0)
PRED_DEF("protocol", 1, protocol, 0)
PRED_DEF("protocola", 1, protocola, 0)
PRED_DEF("noprotocol", 0, noprotocol, 0)
PRED_DEF("protocolling", 1, protocolling, 0)
PRED_DEF("prompt1", 1, prompt1, 0)
PRED_DEF("seek", 4, seek, 0)
PRED_DEF("wait_for_input", 3, wait_for_input, 0)
PRED_DEF("get_single_char", 1, get_single_char, 0)
PRED_DEF("read_pending_input", 3, read_pending_input, 0)
PRED_DEF("source_location", 2, source_location, 0)
PRED_DEF("copy_stream_data", 3, copy_stream_data3, 0)
PRED_DEF("copy_stream_data", 2, copy_stream_data2, 0)
PRED_DEF("stream_pair", 3, stream_pair, 0)
PRED_DEF("set_end_of_stream", 1, set_end_of_stream, 0)
/* SWI internal */
PRED_DEF("$push_input_context", 1, push_input_context, 0)
PRED_DEF("$pop_input_context", 0, pop_input_context, 0)
PRED_DEF("$input_context", 1, input_context, 0)
PRED_DEF("$size_stream", 2, size_stream, 0)
EndPredDefs
#if __YAP_PROLOG__
static int
pl_get_time(term_t t)
{ return PL_unify_float(t, WallTime());
}
static word
pl_sleep(term_t time)
{ double t;
if ( PL_get_float_ex(time, &t) )
return Pause(t);
fail;
}
static const PL_extension foreigns[] = {
FRG("nl", 0, pl_nl, ISO),
FRG("write_canonical", 1, pl_write_canonical, ISO),
FRG("write_term", 2, pl_write_term, ISO),
FRG("write_term", 3, pl_write_term3, ISO),
FRG("write", 1, pl_write, ISO),
FRG("writeq", 1, pl_writeq, ISO),
FRG("print", 1, pl_print, 0),
FRG("writeln", 1, pl_writeln, 0),
FRG("nl", 1, pl_nl1, ISO),
FRG("format", 2, pl_format, METAP),
FRG("write", 2, pl_write2, ISO),
FRG("writeq", 2, pl_writeq2, ISO),
FRG("print", 2, pl_print2, 0),
FRG("write_canonical", 2, pl_write_canonical2, ISO),
FRG("format", 3, pl_format3, METAP),
FRG("sleep", 1, pl_sleep, 0),
FRG("get_time", 1, pl_get_time, 0),
// vsc
FRG("format_predicate", 2, pl_format_predicate, METAP),
FRG("current_format_predicate", 2, pl_current_format_predicate,
METAP|NDET),
FRG("$raw_read", 1, pl_raw_read, 0),
FRG("$raw_read", 2, pl_raw_read2, 0),
FRG("$swi_current_prolog_flag", 5, pl_prolog_flag5, NDET),
FRG("$swi_current_prolog_flag", 2, pl_prolog_flag, NDET|ISO),
/* DO NOT ADD ENTRIES BELOW THIS ONE */
LFRG((char *)NULL, 0, NULL, 0)
};
struct PL_local_data *Yap_InitThreadIO(int wid)
{
struct PL_local_data *p;
if (wid)
p = (struct PL_local_data *)malloc(sizeof(struct PL_local_data));
else
return &lds;
if (!p) {
Yap_Error(RESOURCE_ERROR_HEAP, 0L, "Creating thread %d\n", wid);
return p;
}
#if THREADS
memmove(p, Yap_local[0]->PL_local_data_p_, sizeof(struct PL_local_data));
#endif
return p;
}
#ifdef THREADS
#define COUNT_MUTEX_INITIALIZER(name) \
{ PTHREAD_MUTEX_INITIALIZER, \
name, \
0L \
}
counting_mutex _PL_mutexes[] =
{ COUNT_MUTEX_INITIALIZER("L_MISC"),
COUNT_MUTEX_INITIALIZER("L_ALLOC"),
COUNT_MUTEX_INITIALIZER("L_ATOM"),
COUNT_MUTEX_INITIALIZER("L_FLAG"),
COUNT_MUTEX_INITIALIZER("L_FUNCTOR"),
COUNT_MUTEX_INITIALIZER("L_RECORD"),
COUNT_MUTEX_INITIALIZER("L_THREAD"),
COUNT_MUTEX_INITIALIZER("L_PREDICATE"),
COUNT_MUTEX_INITIALIZER("L_MODULE"),
COUNT_MUTEX_INITIALIZER("L_TABLE"),
COUNT_MUTEX_INITIALIZER("L_BREAK"),
COUNT_MUTEX_INITIALIZER("L_FILE"),
COUNT_MUTEX_INITIALIZER("L_PLFLAG"),
COUNT_MUTEX_INITIALIZER("L_OP"),
COUNT_MUTEX_INITIALIZER("L_INIT"),
COUNT_MUTEX_INITIALIZER("L_TERM"),
COUNT_MUTEX_INITIALIZER("L_GC"),
COUNT_MUTEX_INITIALIZER("L_AGC"),
COUNT_MUTEX_INITIALIZER("L_STOPTHEWORLD"),
COUNT_MUTEX_INITIALIZER("L_FOREIGN"),
COUNT_MUTEX_INITIALIZER("L_OS"),
COUNT_MUTEX_INITIALIZER("L_LOCALE")
#ifdef __WINDOWS__
, COUNT_MUTEX_INITIALIZER("L_DDE")
, COUNT_MUTEX_INITIALIZER("L_CSTACK")
#endif
};
static void
initMutexes( void )
{ counting_mutex *m;
int n = sizeof(_PL_mutexes)/sizeof(*m);
int i;
for(i=0, m=_PL_mutexes; i<n; i++, m++)
simpleMutexInit(&m->mutex);
}
#endif
static void
init_yap(void)
{
GET_LD
#ifdef THREADS
initMutexes();
#endif
/* we need encodings first */
#ifdef O_LOCALE
initLocale();
#endif
initCharTypes();
debugstatus.styleCheck = LONGATOM_CHECK|MULTITON_CHECK|DISCONTIGUOUS_STYLE|MULTIPLE_CHECK|SINGLETON_CHECK;
initPrologFlags();
clearPrologFlagMask(PLFLAG_DEBUGINFO);
setPrologFlagMask(PLFLAG_TTY_CONTROL);
initFiles();
PL_register_extensions(PL_predicates_from_ctype);
PL_register_extensions(PL_predicates_from_file);
PL_register_extensions(PL_predicates_from_files);
PL_register_extensions(PL_predicates_from_glob);
PL_register_extensions(PL_predicates_from_write);
PL_register_extensions(PL_predicates_from_read);
PL_register_extensions(PL_predicates_from_tai);
PL_register_extensions(PL_predicates_from_prologflag);
//PL_register_extensions(PL_predicates_from_system);
#ifdef O_LOCALE
PL_register_extensions(PL_predicates_from_locale);
#endif
#ifdef __WINDOWS__
PL_register_extensions(PL_predicates_from_win);
#endif
PL_register_extensions(foreigns);
fileerrors = TRUE;
SinitStreams();
initOs();
PL_install_readline();
}
#endif
/**
@}
*/
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