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yap-6.3/os/pl-stream.c

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/* $Id$
Part of SWI-Prolog
Author: Jan Wielemaker
E-mail: J.Wielemaker@uva.nl
WWW: http://www.swi-prolog.org
Copyright (C): 1985-2009, University of 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#if defined(__WINDOWS__)||defined(__WIN32)
#include <windows/uxnt.h>
#ifndef _YAP_NOT_INSTALLED_
#ifdef WIN64
#define MD "config/win64.h"
#else
#define MD "config/win32.h"
#endif
#endif
#include <winsock2.h>
#include "windows/mswchar.h"
#define CRLF_MAPPING 1
#endif
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
This modules defines the SWI-Prolog I/O streams. These streams are
provided to gain common access to any type of character data: files,
stdio streams, but also resources, strings, XPCE objects, etc.
MT:
Multithreading is supported through Slock() and Sunlock(). These are
recursive locks. If a stream handle might be known to another thread
locking is required.
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
#ifdef MD
#include MD
#else
#include <config.h>
#endif
#if _FILE_OFFSET_BITS == 64 || defined(_LARGE_FILES)
#define O_LARGEFILES 1 /* use for conditional code in Prolog */
#else
#undef O_LARGEFILES
#endif
#define PL_KERNEL 1
#include <wchar.h>
typedef wchar_t pl_wchar_t;
#include "SWI-Stream.h"
#include "pl-utf8.h"
#include <sys/types.h>
#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#else
#include <time.h>
#endif
#include <errno.h>
#ifdef HAVE_MALLOC_H
#include <malloc.h>
#else
#ifdef HAVE_SYS_MALLOC_H
#include <sys/malloc.h>
#endif
#endif
#include <memory.h>
#include <string.h>
#include <fcntl.h>
#include <stdlib.h>
#include <limits.h>
#include <stdarg.h>
#include <ctype.h>
#include <sys/stat.h>
#ifdef HAVE_SYS_SELECT_H
#include <sys/select.h>
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <stdio.h> /* sprintf() for numeric values */
#include <assert.h>
#ifdef SYSLIB_H
#include SYSLIB_H
#endif
#ifndef MB_LEN_MAX
#define MB_LEN_MAX 6
#endif
#define ROUND(p, n) ((((p) + (n) - 1) & ~((n) - 1)))
#define UNDO_SIZE ROUND(MB_LEN_MAX, sizeof(wchar_t))
#ifndef FALSE
#define FALSE 0
#endif
#ifndef TRUE
#define TRUE 1
#endif
#define char_to_int(c) (0xff & (int)(c))
#define TMPBUFSIZE 256 /* Serror bufsize for Svfprintf() */
int Slinesize = SIO_LINESIZE; /* Sgets() buffer size */
static ssize_t S__flushbuf(IOSTREAM *s);
static void run_close_hooks(IOSTREAM *s);
static int S__removebuf(IOSTREAM *s);
static int S__seterror(IOSTREAM *s);
#ifdef O_PLMT
#define SLOCK(s) if ( s->mutex ) recursiveMutexLock(s->mutex)
#define SUNLOCK(s) if ( s->mutex ) recursiveMutexUnlock(s->mutex)
static inline int
STRYLOCK(IOSTREAM *s)
{ if ( s->mutex &&
recursiveMutexTryLock(s->mutex) == EBUSY )
return FALSE;
return TRUE;
}
#else
#define SLOCK(s)
#define SUNLOCK(s)
#define STRYLOCK(s) (TRUE)
#endif
typedef void *record_t;
typedef void *Module;
typedef intptr_t term_t;
typedef intptr_t atom_t;
#include "pl-error.h"
extern int fatalError(const char *fm, ...);
extern int PL_handle_signals(void);
extern IOENC initEncoding(void);
extern int reportStreamError(IOSTREAM *s);
extern record_t PL_record(term_t t);
extern int PL_thread_self(void);
/*******************************
* BUFFER *
*******************************/
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Note that the buffer is allocated from s->unbuffer, which starts
UNDO_SIZE before s->buffer, so we can always push-back a wide
character into a multibyte stream. We do not do this for SIO_USERBUF
case, but this is only used by the output stream Svfprintf() where it is
not needed.
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
static size_t
S__setbuf(IOSTREAM *s, char *buffer, size_t size)
{ char *newbuf, *newunbuf;
int newflags = s->flags;
if ( size == 0 )
size = SIO_BUFSIZE;
if ( (s->flags & SIO_OUTPUT) )
{ if ( S__removebuf(s) < 0 )
return -1;
}
if ( buffer )
{ newunbuf = newbuf = buffer;
newflags |= SIO_USERBUF;
} else
{ if ( !(newunbuf = malloc(size+UNDO_SIZE)) )
{ errno = ENOMEM;
return -1;
}
newflags &= ~SIO_USERBUF;
newbuf = newunbuf + UNDO_SIZE;
}
if ( (s->flags & SIO_INPUT) )
{ size_t buffered = s->limitp - s->bufp;
size_t copy = (buffered < size ? buffered : size);
if ( size < buffered )
{ size_t offset = size - buffered;
int64_t newpos;
if ( s->functions->seek64 )
{ newpos = (*s->functions->seek64)(s->handle, offset, SIO_SEEK_CUR);
} else if ( s->functions->seek )
{ newpos = (*s->functions->seek)(s->handle, (long)offset, SIO_SEEK_CUR);
} else
{ newpos = -1;
errno = ESPIPE;
}
if ( newpos == -1 )
{ if ( !(newflags & SIO_USERBUF) )
{ int oldeno = errno;
free(newunbuf);
errno = oldeno;
S__seterror(s);
return -1;
}
}
}
memcpy(newbuf, s->bufp, copy);
S__removebuf(s);
s->unbuffer = newunbuf;
s->bufp = s->buffer = newbuf;
s->limitp = s->buffer+copy;
} else
{ s->unbuffer = newunbuf;
s->bufp = s->buffer = newbuf;
s->limitp = &s->buffer[size];
}
s->bufsize = (int)size;
s->flags = newflags;
return size;
}
void
Ssetbuffer(IOSTREAM *s, char *buffer, size_t size)
{ if ( S__setbuf(s, buffer, size) != (size_t)-1 )
s->flags &= ~SIO_USERBUF;
}
static int
S__removebuf(IOSTREAM *s)
{ if ( s->buffer && s->unbuffer )
{ int rval = 0;
if ( (s->flags & SIO_OUTPUT) && S__flushbuf(s) < 0 )
rval = -1;
if ( !(s->flags & SIO_USERBUF) )
free(s->unbuffer);
s->bufp = s->limitp = s->buffer = s->unbuffer = NULL;
s->bufsize = 0;
return rval;
}
return 0;
}
#ifdef DEBUG_IO_LOCKS
static char *
Sname(IOSTREAM *s)
{ if ( s == Serror ) return "error";
if ( s == Sinput ) return "input";
if ( s == Soutput ) return "output";
return "?";
}
#include <execinfo.h>
#include <string.h>
static void
print_trace(void)
{ void *array[7];
size_t size;
char **strings;
size_t i;
size = backtrace(array, sizeof(array)/sizeof(void *));
strings = backtrace_symbols(array, size);
printf(" Stack:");
for(i = 1; i < size; i++)
{ printf("\n\t[%ld] %s", (long)i, strings[i]);
}
printf("\n");
free(strings);
}
#endif /*DEBUG_IO_LOCKS*/
int
Slock(IOSTREAM *s)
{ SLOCK(s);
if ( s->erased )
{ SUNLOCK(s);
return -1;
}
#ifdef DEBUG_IO_LOCKS
if ( s->locks > 2 )
{ printf(" Lock [%d]: %s: %d locks", PL_thread_self(), Sname(s), s->locks+1);
print_trace();
}
#endif
if ( !s->locks++ )
{ if ( (s->flags & (SIO_NBUF|SIO_OUTPUT)) == (SIO_NBUF|SIO_OUTPUT) )
return S__setbuf(s, NULL, TMPBUFSIZE) == (size_t)-1 ? -1 : 0;
}
return 0;
}
int
StryLock(IOSTREAM *s)
{ if ( !STRYLOCK(s) )
return -1;
if ( s->erased )
{ SUNLOCK(s);
return -1;
}
if ( !s->locks++ )
{ if ( (s->flags & (SIO_NBUF|SIO_OUTPUT)) == (SIO_NBUF|SIO_OUTPUT) )
return S__setbuf(s, NULL, TMPBUFSIZE) == (size_t)-1 ? -1 : 0;
}
return 0;
}
int
Sunlock(IOSTREAM *s)
{ int rval = 0;
#ifdef DEBUG_IO_LOCKS
if ( s->locks > 3 )
{ printf("Unlock [%d]: %s: %d locks", PL_thread_self(), Sname(s), s->locks-1);
print_trace();
}
#endif
if ( s->locks )
{ if ( --s->locks == 0 )
{ if ( (s->flags & (SIO_NBUF|SIO_OUTPUT)) == (SIO_NBUF|SIO_OUTPUT) )
rval = S__removebuf(s);
}
} else
{ assert(0);
}
SUNLOCK(s);
return rval;
}
/*******************************
* FLUSH/FILL *
*******************************/
/* return values: -1: error, else #bytes written */
static ssize_t
S__flushbuf(IOSTREAM *s)
{ char *from, *to;
ssize_t rc;
SLOCK(s);
from = s->buffer;
to = s->bufp;
while ( from < to )
{ size_t size = (size_t)(to - from);
ssize_t n = (*s->functions->write)(s->handle, from, size);
if ( n > 0 ) /* wrote some */
{ from += n;
} else if ( n < 0 ) /* error */
{ S__seterror(s);
rc = -1;
goto out;
} else /* wrote nothing? */
{ break;
}
}
if ( to == from ) /* full flush */
{ rc = s->bufp - s->buffer;
s->bufp = s->buffer;
} else /* partial flush */
{ size_t left = to - from;
rc = from - s->buffer;
memmove(s->buffer, from, left);
s->bufp = s->buffer + left;
}
out:
SUNLOCK(s);
return rc;
}
static int
S__flushbufc(int c, IOSTREAM *s)
{ if ( s->buffer )
{ if ( S__flushbuf(s) <= 0 ) /* == 0: no progress!? */
c = -1;
else
*s->bufp++ = (c & 0xff);
} else
{ if ( s->flags & SIO_NBUF )
{ char chr = (char)c;
if ( (*s->functions->write)(s->handle, &chr, 1) != 1 )
{ S__seterror(s);
c = -1;
}
} else
{ if ( S__setbuf(s, NULL, 0) == (size_t)-1 )
c = -1;
else
*s->bufp++ = (char)c;
}
}
return c;
}
static int
Swait_for_data(IOSTREAM *s)
{ int fd = Sfileno(s);
fd_set wait;
struct timeval time;
int rc;
if ( fd < 0 )
{ errno = EPERM; /* no permission to select */
s->flags |= SIO_FERR;
return -1;
}
time.tv_sec = s->timeout / 1000;
time.tv_usec = (s->timeout % 1000) * 1000;
FD_ZERO(&wait);
#ifdef __WINDOWS__
FD_SET((SOCKET)fd, &wait);
#else
FD_SET(fd, &wait);
#endif
for(;;)
{ rc = select(fd+1, &wait, NULL, NULL, &time);
if ( rc < 0 && errno == EINTR )
{ if ( PL_handle_signals() < 0 )
{ errno = EPLEXCEPTION;
return -1;
}
continue;
}
break;
}
if ( rc == 0 )
{ s->flags |= (SIO_TIMEOUT|SIO_FERR);
return -1;
}
return 0; /* ok, data available */
}
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
S__fillbuf() fills the read-buffer, returning the first character of it.
It also realises the SWI-Prolog timeout facility.
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
int
S__fillbuf(IOSTREAM *s)
{ int c;
if ( s->flags & (SIO_FEOF|SIO_FERR) )
{ s->flags |= SIO_FEOF2; /* reading past eof */
return -1;
}
#ifdef HAVE_SELECT
s->flags &= ~SIO_TIMEOUT;
if ( s->timeout >= 0 && !s->downstream )
{ int rc;
if ( (rc=Swait_for_data(s)) < 0 )
return rc;
}
#endif
if ( s->flags & SIO_NBUF )
{ char chr;
ssize_t n;
if ( (n=(*s->functions->read)(s->handle, &chr, 1)) == 1 )
{ c = char_to_int(chr);
return c;
} else if ( n == 0 )
{ if ( !(s->flags & SIO_NOFEOF) )
s->flags |= SIO_FEOF;
return -1;
} else
{ S__seterror(s);
return -1;
}
} else
{ ssize_t n;
size_t len;
if ( !s->buffer )
{ if ( S__setbuf(s, NULL, 0) == (size_t)-1 )
return -1;
s->bufp = s->limitp = s->buffer;
len = s->bufsize;
} else if ( s->bufp < s->limitp )
{ len = s->limitp - s->bufp;
memmove(s->buffer, s->bufp, s->limitp - s->bufp);
s->bufp = s->buffer;
s->limitp = &s->bufp[len];
len = s->bufsize - len;
} else
{ s->bufp = s->limitp = s->buffer;
len = s->bufsize;
}
if ( (n=(*s->functions->read)(s->handle, s->limitp, len)) > 0 )
{ s->limitp += n;
c = char_to_int(*s->bufp++);
return c;
} else
{ if ( n == 0 )
{ if ( !(s->flags & SIO_NOFEOF) )
s->flags |= SIO_FEOF;
return -1;
#ifdef EWOULDBLOCK
} else if ( errno == EWOULDBLOCK )
{ s->bufp = s->buffer;
s->limitp = s->buffer;
S__seterror(s);
return -1;
#endif
} else
{ S__seterror(s);
return -1;
}
}
}
}
/*******************************
* CHARACTER I/O *
*******************************/
static inline void
update_linepos(IOSTREAM *s, int c)
{ IOPOS *p = s->position;
if ( c > '\r' ) /* speedup the 99% case a bit */
{ p->linepos++;
return;
}
switch(c)
{ case '\n':
p->lineno++;
p->linepos = 0;
s->flags &= ~SIO_NOLINEPOS;
break;
case '\r':
p->linepos = 0;
s->flags &= ~SIO_NOLINEPOS;
break;
case '\b':
if ( p->linepos > 0 )
p->linepos--;
break;
case EOF:
break;
case '\t':
p->linepos |= 7;
default:
p->linepos++;
}
}
int
S__fcheckpasteeof(IOSTREAM *s, int c)
{ S__checkpasteeof(s, c);
return c;
}
int
S__fupdatefilepos_getc(IOSTREAM *s, int c)
{ IOPOS *p = s->position;
update_linepos(s, c);
p->byteno++;
p->charno++;
return c;
}
static inline int
S__updatefilepos(IOSTREAM *s, int c)
{ IOPOS *p = s->position;
if ( p )
{ update_linepos(s, c);
p->charno++;
}
S__checkpasteeof(s,c);
return c;
}
static inline int
get_byte(IOSTREAM *s)
{ int c = Snpgetc(s);
if ( s->position )
s->position->byteno++;
return c;
}
static int
put_byte(int c, IOSTREAM *s)
{ c &= 0xff;
if ( s->bufp < s->limitp )
{ *s->bufp++ = c;
} else
{ if ( S__flushbufc(c, s) < 0 )
{ s->lastc = EOF;
return -1;
}
}
if ( s->position )
s->position->byteno++;
return c;
}
int
Sputc(int c, IOSTREAM *s)
{ c &= 0xff;
if ( put_byte(c, s) < 0 )
return -1;
s->lastc = c;
if ( c == '\n' && (s->flags & SIO_LBUF) )
{ if ( S__flushbuf(s) < 0 )
return -1;
}
return S__updatefilepos(s, c);
}
int
Sfgetc(IOSTREAM *s)
{ return Sgetc(s);
}
static inline void
unget_byte(int c, IOSTREAM *s)
{ IOPOS *p = s->position;
*--s->bufp = c;
if ( p )
{ p->charno--; /* FIXME: not correct */
p->byteno--;
if ( c == '\n' )
p->lineno--;
s->flags |= SIO_NOLINEPOS;
}
}
int
Sungetc(int c, IOSTREAM *s)
{ if ( s->bufp > s->unbuffer )
{ unget_byte(c, s);
return c;
}
return -1;
}
static int
reperror(int c, IOSTREAM *s)
{ if ( c >= 0 && (s->flags & (SIO_REPXML|SIO_REPPL)) )
{ char buf[16];
const char *q;
if ( (s->flags & SIO_REPPL) )
{ if ( c <= 0xffff )
sprintf(buf, "\\u%04X", c);
else
sprintf(buf, "\\U%08X", c);
} else
sprintf(buf, "&#%d;", c);
for(q = buf; *q; q++)
{ if ( put_byte(*q, s) < 0 )
return -1;
}
return c;
}
Sseterr(s, SIO_FERR|SIO_CLEARERR, "Encoding cannot represent character");
return -1;
}
static int
put_code(int c, IOSTREAM *s)
{ switch(s->encoding)
{ case ENC_OCTET:
case ENC_ISO_LATIN_1:
if ( c >= 256 )
{ if ( reperror(c, s) < 0 )
return -1;
break;
}
simple:
if ( put_byte(c, s) < 0 )
return -1;
break;
case ENC_ASCII:
if ( c >= 128 )
{ if ( reperror(c, s) < 0 )
return -1;
break;
}
goto simple;
case ENC_ANSI:
{ char b[MB_LEN_MAX];
size_t n;
if ( !s->mbstate )
{ if ( !(s->mbstate = malloc(sizeof(*s->mbstate))) )
return EOF; /* out of memory */
memset(s->mbstate, 0, sizeof(*s->mbstate));
}
if ( (n = wcrtomb(b, (wchar_t)c, s->mbstate)) == (size_t)-1 )
{ if ( reperror(c, s) < 0 )
return -1;
} else
{ size_t i;
for(i=0; i<n; i++)
{ if ( put_byte(b[i]&0xff, s) < 0 )
return -1;
}
}
break;
}
case ENC_UTF8:
{ char buf[6];
char *p, *end;
if ( c < 128 )
goto simple;
end = utf8_put_char(buf, c);
for(p=buf; p<end; p++)
{ if ( put_byte(*p&0xff, s) < 0 )
return -1;
}
break;
}
case ENC_UNICODE_BE:
if ( put_byte(c>>8, s) < 0 )
return -1;
if ( put_byte(c&0xff, s) < 0 )
return -1;
break;
case ENC_UNICODE_LE:
if ( put_byte(c&0xff, s) < 0 )
return -1;
if ( put_byte(c>>8, s) < 0 )
return -1;
break;
case ENC_WCHAR:
{ pl_wchar_t chr = c;
unsigned char *q = (unsigned char *)&chr;
unsigned char *e = &q[sizeof(pl_wchar_t)];
while(q<e)
{ if ( put_byte(*q++, s) < 0 )
return -1;
}
break;
}
case ENC_UNKNOWN:
return -1;
}
s->lastc = c;
if ( c == '\n' && (s->flags & SIO_LBUF) )
{ if ( S__flushbuf(s) < 0 )
return -1;
}
return S__updatefilepos(s, c);
}
int
Sputcode(int c, IOSTREAM *s)
{ if ( c < 0 )
return reperror(c, s);
if ( s->tee && s->tee->magic == SIO_MAGIC )
Sputcode(c, s->tee);
if ( c == '\n' && (s->flags&SIO_TEXT) && s->newline == SIO_NL_DOS )
{ if ( put_code('\r', s) < 0 )
return -1;
}
return put_code(c, s);
}
int
Scanrepresent(int c, IOSTREAM *s)
{ switch(s->encoding)
{ case ENC_OCTET:
case ENC_ISO_LATIN_1:
if ( c <= 0xff )
return 0;
return -1;
case ENC_ASCII:
if ( c < 0x7f )
return 0;
return -1;
case ENC_ANSI:
{ mbstate_t state;
char b[MB_LEN_MAX];
memset(&state, 0, sizeof(state));
if ( wcrtomb(b, (wchar_t)c, &state) != (size_t)-1 )
return 0;
return -1;
}
case ENC_WCHAR:
if ( sizeof(wchar_t) > 2 )
return 0;
/*FALLTHROUGH*/
case ENC_UNICODE_BE:
case ENC_UNICODE_LE:
if ( c <= 0xffff )
return 0;
return -1;
case ENC_UTF8:
return 0;
default:
assert(0);
return -1;
}
}
int
Sgetcode(IOSTREAM *s)
{ int c;
retry:
switch(s->encoding)
{ case ENC_OCTET:
case ENC_ISO_LATIN_1:
c = get_byte(s);
break;
case ENC_ASCII:
{ c = get_byte(s);
if ( c > 128 )
Sseterr(s, SIO_WARN, "non-ASCII character");
break;
}
case ENC_ANSI:
{ char b[1];
size_t rc, n = 0;
wchar_t wc;
if ( !s->mbstate )
{ if ( !(s->mbstate = malloc(sizeof(*s->mbstate))) )
return EOF; /* out of memory */
memset(s->mbstate, 0, sizeof(*s->mbstate));
}
for(;;)
{ if ( (c = get_byte(s)) == EOF )
{ if ( n == 0 )
{ goto out;
} else
{ Sseterr(s, SIO_WARN, "EOF in multibyte Sequence");
goto mberr;
}
}
b[0] = c;
if ( (rc=mbrtowc(&wc, b, 1, s->mbstate)) == 1 )
{ c = wc;
goto out;
} else if ( rc == (size_t)-1 )
{ Sseterr(s, SIO_WARN, "Illegal multibyte Sequence");
goto mberr;
} /* else -2: incomplete */
}
mberr:
c = UTF8_MALFORMED_REPLACEMENT;
goto out;
}
case ENC_UTF8:
{ c = get_byte(s);
if ( c == EOF )
break;
if ( c & 0x80 )
{ int extra = UTF8_FBN(c);
int code;
if ( extra < 0 )
{ Sseterr(s, SIO_WARN, "Illegal UTF-8 start");
c = UTF8_MALFORMED_REPLACEMENT;
goto out;
}
code = UTF8_FBV(c,extra);
for( ; extra > 0; extra-- )
{ int c2 = get_byte(s);
if ( !ISUTF8_CB(c2) )
{ Sseterr(s, SIO_WARN, "Illegal UTF-8 continuation");
c = UTF8_MALFORMED_REPLACEMENT;
Sungetc(c2, s);
goto out;
}
code = (code<<6)+(c2&0x3f);
}
c = code;
}
break;
}
case ENC_UNICODE_BE:
case ENC_UNICODE_LE:
{ int c1, c2;
c1 = get_byte(s);
if ( c1 == EOF )
{ c = -1;
goto out;
}
c2 = get_byte(s);
if ( c2 == EOF )
{ Sseterr(s, SIO_WARN, "EOF in unicode character");
c = UTF8_MALFORMED_REPLACEMENT;
} else
{ if ( s->encoding == ENC_UNICODE_BE )
c = (c1<<8)+c2;
else
c = (c2<<8)+c1;
}
break;
}
case ENC_WCHAR:
{ pl_wchar_t chr;
char *p = (char*)&chr;
size_t n;
for(n=0; n<sizeof(pl_wchar_t); n++)
{ int c1 = get_byte(s);
if ( c1 == EOF )
{ if ( n == 0 )
{ c = -1;
goto out;
} else
{ Sseterr(s, SIO_WARN, "EOF in UCS character");
c = UTF8_MALFORMED_REPLACEMENT;
goto out;
}
}
*p++ = c1;
}
c = chr;
break;
}
default:
assert(0);
c = -1;
}
out:
if ( c == '\r' && (s->flags&SIO_TEXT) )
{ switch(s->newline)
{ case SIO_NL_DETECT:
s->newline = SIO_NL_DOS;
/*FALLTHROUGH*/
case SIO_NL_DOS:
goto retry;
}
}
if ( s->tee && s->tee->magic == SIO_MAGIC && c != -1 )
Sputcode(c, s->tee);
return S__updatefilepos(s, c);
}
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
peek needs to keep track of the actual bytes processed because not doing
so might lead to an incorrect byte-count in the position term. The
simplest example is that when looking at \r\n in Windows, get_code/1
returns \n, but it returns the same for a single \n.
Often, we could keep track of bufp and reset this, but we must deal with
the case where we fetch a new buffer. In this case, we must copy the few
remaining bytes to the `unbuffer' area.
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
int
Speekcode(IOSTREAM *s)
{ int c;
char *start;
IOPOS *psave = s->position;
size_t safe = (size_t)-1;
if ( !s->buffer )
{ if ( (s->flags & SIO_NBUF) )
{ errno = EINVAL;
return -1;
}
if ( S__setbuf(s, NULL, 0) == (size_t)-1 )
return -1;
}
if ( (s->flags & SIO_FEOF) )
return -1;
if ( s->bufp + UNDO_SIZE > s->limitp )
{ safe = s->limitp - s->bufp;
memcpy(s->buffer-safe, s->bufp, safe);
}
start = s->bufp;
s->position = NULL;
c = Sgetcode(s);
s->position = psave;
if ( Sferror(s) )
return -1;
s->flags &= ~(SIO_FEOF|SIO_FEOF2);
if ( s->bufp > start )
{ s->bufp = start;
} else
{ assert(safe != (size_t)-1);
s->bufp = s->buffer-safe;
}
return c;
}
/*******************************
* PUTW/GETW *
*******************************/
int
Sputw(int w, IOSTREAM *s)
{ unsigned char *q = (unsigned char *)&w;
unsigned int n;
for(n=0; n<sizeof(w); n++)
{ if ( Sputc(*q++, s) < 0 )
return -1;
}
return w;
}
int
Sgetw(IOSTREAM *s)
{ int w;
unsigned char *q = (unsigned char *)&w;
unsigned int n;
for(n=0; n<sizeof(w); n++)
{ int c;
if ( (c = Sgetc(s)) < 0 )
return -1;
*q++ = c & 0xff;
}
return w;
}
/*******************************
* FREAD/FWRITE *
*******************************/
size_t
Sfread(void *data, size_t size, size_t elms, IOSTREAM *s)
{ size_t chars = size * elms;
char *buf = data;
if ( s->position )
{ for( ; chars > 0; chars-- )
{ int c;
if ( (c = Sgetc(s)) == EOF )
break;
*buf++ = c & 0xff;
}
} else
{ while(chars > 0)
{ int c;
if ( s->bufp < s->limitp )
{ size_t avail = s->limitp - s->bufp;
if ( chars <= avail )
{ memcpy(buf, s->bufp, chars);
s->bufp += chars;
return elms;
} else
{ memcpy(buf, s->bufp, avail);
chars -= avail;
buf += avail;
s->bufp += avail;
}
}
if ( (c = S__fillbuf(s)) == EOF )
break;
*buf++ = c & 0xff;
chars--;
}
}
return (size*elms - chars)/size;
}
size_t
Sfwrite(const void *data, size_t size, size_t elms, IOSTREAM *s)
{ size_t chars = size * elms;
const char *buf = data;
for( ; chars > 0; chars-- )
{ if ( Sputc(*buf++, s) < 0 )
break;
}
return (size*elms - chars)/size;
}
/*******************************
* PENDING *
*******************************/
ssize_t
Sread_pending(IOSTREAM *s, char *buf, size_t limit, int flags)
{ int done = 0;
size_t n;
if ( s->bufp >= s->limitp && (flags & SIO_RP_BLOCK) )
{ int c = S__fillbuf(s);
if ( c < 0 )
{ if ( (s->flags & SIO_FEOF) )
return 0;
return c;
}
buf[0] = c;
limit--;
done = 1;
}
n = s->limitp - s->bufp;
if ( n > limit )
n = limit;
memcpy(&buf[done], s->bufp, n);
s->bufp += n;
return done+n;
}
/*******************************
* BOM *
*******************************/
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Check the stream for a BOM (Byte Order Marker). If present (and known),
update the stream encoding. Return value is one of
-1: error (check errno)
0: ok. If BOM, SIO_BOM is added to flags
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
typedef struct
{ IOENC encoding;
unsigned int bomlen;
const char *bom;
} bomdef;
static const bomdef bomdefs[] =
{ { ENC_UTF8, 3, "\357\273\277" }, /* 0xef, 0xbb, 0xbb */
{ ENC_UNICODE_BE, 2, "\376\377" }, /* 0xfe, oxff */
{ ENC_UNICODE_LE, 2, "\377\376" }, /* 0xff, oxfe */
{ ENC_UNKNOWN, 0, NULL }
};
int
ScheckBOM(IOSTREAM *s)
{ if ( (s->flags & SIO_NBUF) )
{ errno = EINVAL;
return -1;
}
for(;;)
{ size_t avail = s->limitp - s->bufp;
const bomdef *bd;
for(bd=bomdefs; bd->bomlen; bd++)
{ if ( avail >= bd->bomlen && memcmp(s->bufp, bd->bom, bd->bomlen) == 0 )
{ s->encoding = bd->encoding;
s->bufp += bd->bomlen;
s->flags |= SIO_BOM;
return 0;
}
}
if ( avail >= 4 ) /* longest BOM */
return 0;
if ( S__fillbuf(s) == -1 )
return 0; /* empty stream */
s->bufp--;
}
}
int
SwriteBOM(IOSTREAM *s)
{ switch(s->encoding)
{ case ENC_UTF8:
case ENC_UNICODE_LE:
case ENC_UNICODE_BE:
{ if ( Sputcode(0xfeff, s) != -1 )
{ s->flags |= SIO_BOM;
return 0;
}
return -1;
}
default:
return 0;
}
}
/*******************************
* FLAGS *
*******************************/
int
Sfeof(IOSTREAM *s)
{ if ( s->flags & SIO_FEOF )
return TRUE;
if ( s->bufp < s->limitp )
return FALSE;
if ( s->flags & SIO_NBUF )
{ errno = EINVAL;
return -1;
}
if ( s->downstream != NULL &&
Sfeof(s->downstream))
return TRUE;
if ( S__fillbuf(s) == -1 )
return TRUE;
s->bufp--;
return FALSE;
}
static int
S__seterror(IOSTREAM *s)
{ s->io_errno = errno;
if ( !(s->flags&SIO_CLOSING) && /* s->handle is already invalid */
s->functions->control )
{ char *msg;
if ( (*s->functions->control)(s->handle,
SIO_LASTERROR,
(void *)&msg) == 0 )
{ Sseterr(s, SIO_FERR, msg);
return 0;
}
}
s->flags |= SIO_FERR;
return 0;
}
int
Sferror(IOSTREAM *s)
{ return (s->flags & SIO_FERR) != 0;
}
int
Sfpasteof(IOSTREAM *s)
{ return (s->flags & (SIO_FEOF2ERR|SIO_FEOF2)) == (SIO_FEOF2ERR|SIO_FEOF2);
}
void
Sclearerr(IOSTREAM *s)
{ s->flags &= ~(SIO_FEOF|SIO_WARN|SIO_FERR|SIO_FEOF2|SIO_TIMEOUT|SIO_CLEARERR);
s->io_errno = 0;
Sseterr(s, 0, NULL);
}
void
Sseterr(IOSTREAM *s, int flag, const char *message)
{ if ( s->message )
{ free(s->message);
s->message = NULL;
s->flags &= ~SIO_CLEARERR;
}
if ( message )
{ s->flags |= flag;
s->message = strdup(message);
} else
{ s->flags &= ~flag;
}
}
void
Sset_exception(IOSTREAM *s, term_t ex)
{ s->exception = PL_record(ex);
s->flags |= SIO_FERR;
}
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Set the encoding of a stream. The enc argument is the new encoding. If
old is not NULL, the old encoding is written to the given location.
Please note that not all code changing the encoding call Ssetenc at the
moment.
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
int
Ssetenc(IOSTREAM *s, IOENC enc, IOENC *old)
{ if ( old )
*old = s->encoding;
if ( enc == s->encoding )
return 0;
if ( s->functions->control )
{ if ( (*s->functions->control)(s->handle,
SIO_SETENCODING,
(void *)&enc) != 0 )
return -1;
}
s->encoding = enc;
return 0;
}
/*******************************
* FLUSH *
*******************************/
int
Sflush(IOSTREAM *s)
{ if ( s->buffer && (s->flags & SIO_OUTPUT) )
{ if ( S__flushbuf(s) < 0 )
return -1;
if ( s->functions->control &&
(*s->functions->control)(s->handle, SIO_FLUSHOUTPUT, NULL) < 0 )
return -1;
}
return 0;
}
/*******************************
* SEEK *
*******************************/
int
Sunit_size(IOSTREAM *s)
{ switch(s->encoding)
{ case ENC_UNKNOWN:
case ENC_OCTET:
case ENC_ASCII:
case ENC_ISO_LATIN_1:
case ENC_ANSI:
case ENC_UTF8:
return 1;
case ENC_UNICODE_BE:
case ENC_UNICODE_LE:
return 2;
case ENC_WCHAR:
return sizeof(wchar_t);
default:
assert(0);
return 1; /* not reached */
}
}
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Return the size of the underlying data object. Should be optimized;
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
long
Ssize(IOSTREAM *s)
{ if ( s->functions->control )
{ long size;
if ( (*s->functions->control)(s->handle, SIO_GETSIZE, (void *)&size) == 0 )
return size;
}
if ( s->functions->seek )
{ long here = Stell(s);
long end;
if ( Sseek(s, 0, SIO_SEEK_END) == 0 )
end = Stell(s);
else
end = -1;
Sseek(s, here, SIO_SEEK_SET);
return end;
}
errno = ESPIPE;
S__seterror(s);
return -1;
}
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Sseek64(IOSTREAM *s, int64_t pos, int whence)
Re-position the stream to byte-no 'pos'.
Maybe we should optimise this to become block-aligned? Or can we leave
this to read/write?
The first part checks whether repositioning the read pointer in the
buffer suffices to achieve the seek.
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
int
Sseek64(IOSTREAM *s, int64_t pos, int whence)
{ if ( (s->flags & SIO_INPUT) && s->limitp > s->buffer ) /* something there */
{ int64_t now = Stell64(s);
if ( now != -1 )
{ int64_t newpos;
char *nbufp = (char *)-1;
if ( whence == SIO_SEEK_CUR )
{ nbufp = s->bufp + pos;
newpos = now + pos;
} else if ( whence == SIO_SEEK_SET )
{ nbufp = s->bufp + (pos - now);
newpos = pos;
} else
newpos = -1; /* should not happen */
if ( nbufp >= s->buffer && nbufp < s->limitp )
{ s->bufp = nbufp;
pos = newpos;
goto update;
}
}
}
if ( !s->functions->seek && !s->functions->seek64 )
{ errno = ESPIPE;
S__seterror(s);
return -1;
}
Sflush(s);
s->bufp = s->buffer;
if ( (s->flags & SIO_INPUT) )
s->limitp = s->buffer;
if ( whence == SIO_SEEK_CUR )
{ pos += Stell64(s);
whence = SIO_SEEK_SET;
}
if ( s->functions->seek64 )
pos = (*s->functions->seek64)(s->handle, pos, whence);
else if ( pos <= LONG_MAX )
pos = (*s->functions->seek)(s->handle, (long)pos, whence);
else
{ errno = EINVAL;
S__seterror(s);
return -1;
}
if ( pos < 0 )
{ S__seterror(s);
return -1;
}
update:
s->flags &= ~(SIO_FEOF|SIO_FEOF2); /* not on eof of file anymore */
if ( s->position )
{ s->flags |= (SIO_NOLINENO|SIO_NOLINEPOS); /* no update this */
s->position->byteno = pos;
s->position->charno = pos/Sunit_size(s); /* compatibility */
}
return 0;
}
int
Sseek(IOSTREAM *s, long pos, int whence)
{ return Sseek64(s, (int64_t)pos, whence);
}
/* Stell64(IOSTREAM *s) returns the current position in the file in
bytes
*/
int64_t
Stell64(IOSTREAM *s)
{ if ( s->position )
{ return s->position->byteno;
} else if ( s->functions->seek || s->functions->seek64 )
{ int64_t pos;
if ( s->functions->seek64 )
pos = (*s->functions->seek64)(s->handle, 0L, SIO_SEEK_CUR);
else
pos = (*s->functions->seek)(s->handle, 0L, SIO_SEEK_CUR);
if ( s->buffer ) /* open */
{ int64_t off = s->bufp - s->buffer;
if ( s->flags & SIO_INPUT )
off -= s->limitp - s->buffer;
pos += off;
}
return pos;
} else
{ errno = EINVAL;
S__seterror(s);
return -1;
}
}
long
Stell(IOSTREAM *s)
{ int64_t pos = Stell64(s);
if ( pos == -1 )
return -1;
if ( pos <= LONG_MAX )
return (long) pos;
errno = EINVAL;
S__seterror(s);
return -1;
}
/*******************************
* CLOSE *
*******************************/
void
unallocStream(IOSTREAM *s)
{
#ifdef O_PLMT
if ( s->mutex )
{ recursiveMutexDelete(s->mutex);
free(s->mutex);
s->mutex = NULL;
}
#endif
if ( !(s->flags & SIO_STATIC) )
free(s);
}
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
(*) Sclose() can be called recursively. For example if an XPCE object is
only referenced from an open stream, the close-function will delete the
object, which in turn calls the ->unlink which may wish to close the
associated stream.
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
int
Sclose(IOSTREAM *s)
{ int rval = 0;
if ( s->magic != SIO_MAGIC ) /* already closed!? */
{ s->io_errno = errno = EINVAL;
return -1;
}
if ( (s->flags&SIO_CLOSING) ) /* recursive (*) */
return rval;
if ( s->upstream )
{ Sseterr(s, SIO_FERR, "Locked by upstream filter");
reportStreamError(s);
return -1;
}
SLOCK(s);
s->flags |= SIO_CLOSING;
rval = S__removebuf(s);
if ( s->mbstate )
free(s->mbstate);
#ifdef __WINDOWS__
if ( (s->flags & SIO_ADVLOCK) )
{ OVERLAPPED ov;
HANDLE h = (HANDLE)_get_osfhandle((int)s->handle);
memset(&ov, 0, sizeof(ov));
UnlockFileEx(h, 0, 0, 0xffffffff, &ov);
s->flags &= ~SIO_ADVLOCK;
}
#endif
if ( s->functions->close && (*s->functions->close)(s->handle) < 0 )
{ S__seterror(s);
rval = -1;
}
while(s->locks > 0) /* remove buffer-locks */
{ int rc = Sunlock(s);
if ( rval == 0 )
rval = rc;
}
if ( rval < 0 )
reportStreamError(s);
run_close_hooks(s); /* deletes Prolog registration */
SUNLOCK(s);
s->magic = SIO_CMAGIC;
if ( s->message )
free(s->message);
if ( s->references == 0 )
unallocStream(s);
else
s->erased = TRUE;
return rval;
}
/*******************************
* STRING I/O *
*******************************/
char *
Sfgets(char *buf, int n, IOSTREAM *s)
{ char *q = buf;
while( n-- > 0 )
{ int c = Sgetc(s);
if ( c == EOF )
{ *q = '\0';
if ( q == buf )
buf = NULL;
goto out;
} else
{ *q++ = c;
if ( c == '\n' )
{ if ( n > 0 )
*q = '\0';
goto out;
}
}
}
out:
return buf;
}
char *
Sgets(char *buf)
{ char *s = Sfgets(buf, Slinesize, Sinput);
char *q;
if ( s ) /* delete trailing \n */
{ q = &s[strlen(s)];
if ( q > s && q[-1] == '\n' )
*--q = '\0';
}
return s;
}
int
Sfputs(const char *q, IOSTREAM *s)
{ for( ; *q; q++)
{ if ( Sputcode(*q&0xff, s) < 0 )
return EOF;
}
return 0;
}
int
Sputs(const char *q)
{ return Sfputs(q, Soutput);
}
/*******************************
* PRINTF *
*******************************/
int
Sfprintf(IOSTREAM *s, const char *fm, ...)
{ va_list args;
int rval;
va_start(args, fm);
rval = Svfprintf(s, fm, args);
va_end(args);
return rval;
}
int
Sprintf(const char *fm, ...)
{ va_list args;
int rval;
va_start(args, fm);
rval = Svfprintf(Soutput, fm, args);
va_end(args);
return rval;
}
int
Svprintf(const char *fm, va_list args)
{ return Svfprintf(Soutput, fm, args);
}
#define NEXTCHR(s, c) if ( utf8 ) \
{ (s) = utf8_get_char((s), &(c)); \
} else \
{ c = *(s)++; c &= 0xff; \
}
#define OUTCHR(s, c) do { printed++; \
if ( Sputcode((c), (s)) < 0 ) goto error; \
} while(0)
#define valdigit(c) ((c) - '0')
#define A_LEFT 0 /* left-aligned field */
#define A_RIGHT 1 /* right-aligned field */
#define SNPRINTF3(fm, a1) \
{ size_t __r; \
assert(fs == fbuf); \
__r = snprintf(fs, sizeof(fbuf), fm, a1); \
if ( __r >= sizeof(fbuf) ) \
{ if ( (fs_malloced = fs = malloc(__r+1)) == NULL ) goto error; \
__r = snprintf(fs, __r+1, fm, a1); \
} \
fe = fs+__r; \
}
#define SNPRINTF4(fm, a1, a2) \
{ size_t __r; \
assert(fs == fbuf); \
__r = snprintf(fs, sizeof(fbuf), fm, a1, a2); \
if ( __r >= sizeof(fbuf) ) \
{ if ( (fs_malloced = fs = malloc(__r+1)) == NULL ) goto error; \
__r = snprintf(fs, __r+1, fm, a1, a2); \
} \
fe = fs+__r; \
}
int
Svfprintf(IOSTREAM *s, const char *fm, va_list args)
{ int printed = 0;
char buf[TMPBUFSIZE];
int tmpbuf;
char *fs_malloced = NULL;
SLOCK(s);
if ( !s->buffer && (s->flags & SIO_NBUF) )
{ S__setbuf(s, buf, sizeof(buf));
tmpbuf = TRUE;
} else
tmpbuf = FALSE;
while(*fm)
{ if ( *fm == '%' )
{ fm++;
if ( *fm == '%' )
{ OUTCHR(s, *fm);
fm++;
continue;
} else
{ int align = A_RIGHT;
int modified = FALSE;
int has_arg1 = FALSE, has_arg2 = FALSE;
int arg1=0, arg2=0;
char fbuf[100], *fs = fbuf, *fe = fbuf;
int islong = 0;
int pad = ' ';
int utf8 = FALSE;
for(;;)
{ switch(*fm)
{ case '+': align = A_RIGHT; fm++; continue;
case '-': align = A_LEFT; fm++; continue;
case '0': pad = '0'; fm++; continue;
case ' ': pad = ' '; fm++; continue;
case '#': modified = TRUE; fm++; continue;
}
break;
}
if ( *fm == '*' )
{ has_arg1++;
fm++;
arg1 = va_arg(args, int);
} else if ( isdigit(char_to_int(*fm)) )
{ if ( *fm == '0' )
pad = '0';
arg1 = valdigit(*fm);
has_arg1++;
for( fm++; isdigit(char_to_int(*fm)); fm++)
arg1 = arg1*10 + valdigit(*fm);
}
if ( *fm == '.' )
{ has_arg2++;
fm++;
if ( *fm == '*' )
{ arg2 = va_arg(args, int);
} else
{ arg2 = 0;
for( ; isdigit(char_to_int(*fm)); fm++)
arg2 = arg2*10 + valdigit(*fm);
}
}
if ( *fm == 'l' )
{ islong++; /* 1: %ld */
fm++;
}
if ( *fm == 'l' )
{ islong++; /* 2: %lld */
fm++;
}
if ( *fm == 'U' ) /* %Us: UTF-8 string */
{ utf8 = TRUE;
fm++;
}
switch(*fm)
{ case 'c':
*fe++ = va_arg(args, int);
break;
case 'p':
{ void *ptr = va_arg(args, void*);
char fmbuf[8], *fp=fmbuf;
*fp++ = '%';
if ( modified )
*fp++ = '#';
*fp++ = 'p';
*fp = '\0';
SNPRINTF3(fmbuf, ptr);
break;
}
case 'd':
case 'i':
case 'o':
case 'u':
case 'x':
case 'X':
{ intptr_t v = 0; /* make compiler silent */
int64_t vl = 0;
char fmbuf[8], *fp=fmbuf;
switch( islong )
{ case 0:
v = va_arg(args, int);
break;
case 1:
v = va_arg(args, long);
break;
case 2:
vl = va_arg(args, int64_t);
break;
}
*fp++ = '%';
if ( modified )
*fp++ = '#';
*fp++ = 'l';
if ( islong < 2 )
{ *fp++ = *fm;
*fp = '\0';
SNPRINTF3(fmbuf, v);
} else
{
#ifdef __WINDOWS__
strcat(fp-1, "I64"); /* Synchronise with INT64_FORMAT! */
fp += strlen(fp);
#else
*fp++ = 'l';
#endif
*fp++ = *fm;
*fp = '\0';
SNPRINTF3(fmbuf, vl);
}
break;
}
case 'f':
case 'e':
case 'E':
case 'g':
case 'G':
{ double v = va_arg(args, double);
char fmbuf[8], *fp=fmbuf;
*fp++ = '%';
if ( modified )
*fp++ = '#';
if ( has_arg2 ) /* specified precission */
{ *fp++ = '.';
*fp++ = '*';
*fp++ = *fm;
*fp = '\0';
SNPRINTF4(fmbuf, arg2, v);
} else
{ *fp++ = *fm;
*fp = '\0';
SNPRINTF3(fmbuf, v);
}
fe = &fs[strlen(fs)];
break;
}
case 's':
fs = va_arg(args, char *);
if ( !fs )
fs = "(null)";
break;
}
if ( has_arg1 ) /* aligned field */
{ if ( fs == fbuf )
*fe = '\0';
if ( align == A_LEFT )
{ int w = 0;
while(*fs)
{ int c;
NEXTCHR(fs, c);
OUTCHR(s, c);
w++;
}
while(w < arg1)
{ OUTCHR(s, pad);
w++;
}
} else /*if ( align == A_RIGHT ) */
{ size_t w;
if ( fs == fbuf )
w = fe - fs;
else
w = strlen(fs);
if ( utf8 )
w = utf8_strlen(fs, w);
if ( (ssize_t)w < arg1 )
{ w = arg1 - w;
while(w > 0 )
{ OUTCHR(s, pad);
w--;
}
}
while(*fs)
{ int c;
NEXTCHR(fs, c);
OUTCHR(s, c);
}
}
} else
{ if ( fs == fbuf ) /* unaligned field, just output */
{ while(fs < fe)
OUTCHR(s, *fs++);
} else
{ while(*fs)
{ int c;
NEXTCHR(fs, c);
OUTCHR(s, c);
}
}
}
fm++;
if ( fs_malloced )
{ fs_malloced = NULL;
free(fs_malloced);
}
}
} else if ( *fm == '\\' && fm[1] )
{ OUTCHR(s, fm[1]);
fm += 2;
} else
{ OUTCHR(s, *fm);
fm++;
}
}
if ( tmpbuf )
{ if ( S__removebuf(s) < 0 )
goto error;
}
SUNLOCK(s);
return (int)printed;
error:
if ( fs_malloced )
free(fs_malloced);
SUNLOCK(s);
return -1;
}
int
Ssprintf(char *buf, const char *fm, ...)
{ va_list args;
int rval;
va_start(args, fm);
rval = Svsprintf(buf, fm, args);
va_end(args);
return rval;
}
int
Svsprintf(char *buf, const char *fm, va_list args)
{ IOSTREAM s;
int rval;
memset(&s, 0, sizeof(s));
s.bufp = buf;
s.limitp = (char *)(~0L);
s.buffer = buf;
s.flags = SIO_FBUF|SIO_OUTPUT;
s.encoding = ENC_ISO_LATIN_1;
if ( (rval = Svfprintf(&s, fm, args)) >= 0 )
*s.bufp = '\0';
return rval;
}
int
Svdprintf(const char *fm, va_list args)
{ int rval;
IOSTREAM *s = Serror;
Slock(s);
rval = Svfprintf(s, fm, args);
#if defined(_DEBUG) && defined(__WINDOWS__)
Sputc('\0', s);
s->bufp--; /* `Unput' */
OutputDebugString(s->buffer);
#endif
if ( Sflush(s) != 0 )
rval = -1;
Sunlock(s);
return rval;
}
int
Sdprintf(const char *fm, ...)
{ va_list args;
int rval;
va_start(args, fm);
rval = Svdprintf(fm, args);
va_end(args);
return rval;
}
#if 0
/*******************************
* SCANF *
*******************************/
int
Svfscanf(IOSTREAM *s, const char *fm, va_list args)
{ int done = 0; /* # items converted */
int chread = 0; /* # characters read */
int c = GET(s); /* current character */
int supress; /* if TRUE, don't assign (*) */
int field_width; /* max width of field */
int tsize; /* SZ_SHORT, SZ_NORMAL, SZ_LONG */
while(*fm)
{ if ( *fm == ' ' )
{ while ( isblank(c) )
c = GET(s);
fm++;
continue;
} else if ( *fm == '%' && fm[1] != '%' )
{ supress = FALSE;
field_width = -1;
int size = SZ_STANDARD;
for(;;) /* parse modifiers */
{ fm++;
if ( isdigit(*fm) )
{ field_width = valdigit(*fm);
for(++fm; isdigit(*fm); fm++)
field_width = 10*field_width + valdigit(*fm);
fm--;
continue;
}
if ( *fm == '*' )
{ supress++;
continue;
}
if ( *fm == 'l' )
{ size = SZ_LONG;
continue;
}
if ( *fm == 'h' )
{ size = SZ_SHORT;
continue;
}
}
if ( *fm != '[' && *fm != c )
while(isblank(c))
c = GET(s);
switch(*fm)
{ { intptr_t v; /* collect value here */
int negative; /* true if < 0 */
int base; /* base for conversion */
int ok; /* successful */
case 'd':
base = 10;
do_int:
negative = FALSE;
if ( c == '+' )
c = GET(s);
else if ( c == '-' )
{ negative++;
c = GET(s);
}
do_unsigned:
ok = FALSE;
if ( base == 16 ) /* hexadecimal */
{ if ( isxdigit(c) )
{ v = valxdigit(c);
for(c = GET(s); isxdigit(c); c = GET(s))
v = base*v + valxdigit(c);
ok++;
}
} else
{ int cv;
if ( isdigit(c) && (cv=valdigit(c)) < base )
{ v = cv;
for(c = GET(s); isdigit(c) && (cv=valdigit(c)) < base; c = GET(s))
v = base*v + cv;
ok++;
}
}
if ( ok )
{ if ( !supress )
{ if ( negative )
v = -v;
if ( tsize == SZ_SHORT )
{ short *vp = va_arg(args, short *);
*vp = v;
} else if ( tsize == SZ_LONG )
{ intptr_t *vp = va_arg(args, intptr_t *);
*vp = v;
} else
{ int *vp = va_arg(args, int *);
*vp = v;
}
done++;
}
continue; /* with next */
} else
return done;
case 'u':
base = 10;
negative = FALSE;
goto do_unsigned;
case 'o':
base = 8;
goto do_int;
case 'x':
base = 16;
goto do_int;
case 'i':
if ( c == '0' )
{ int c2 = GET(s);
if ( c2 == 'x' )
{ base = 16;
c = GET(s);
} else
{ UNGET(c2, s);
base = 8;
}
negative = FALSE;
goto do_unsigned;
}
base = 10;
goto do_int;
}
case 'n':
if ( !supress )
{ if ( tsize == SZ_SHORT )
{ short *vp = va_arg(args, short *);
*vp = chread;
} else if ( tsize == SZ_LONG )
{ intptr_t *vp = va_arg(args, intptr_t *);
*vp = chread;
} else
{ int *vp = va_arg(args, int *);
*vp = chread;
}
done++;
}
fm++;
continue;
case 'E':
case 'e':
case 'f':
case 'G':
case 'g':
{ char work[200];
char *w = work;
int ds = 0;
double v;
if ( c == '-' || c == '+' ) /* [+|-] */
{ *w++ = c;
c = GET(s);
}
while(isdigit(c)) /* {digit} */
{ *w++ = c;
c = GET(s);
ds++;
}
if ( c == '.' ) /* [.] */
*w++ = c;
while(isdigit(c)) /* {digit} */
{ *w++ = c;
c = GET(s);
ds++;
}
if ( !ds )
SCAN_ERROR(s)
if ( c == 'e' || c == 'E' ) /* [e<digit>{<digit>}] */
{ *w++ = c;
c = GET(s);
if ( !isdigit(c) )
SCAN_ERROR(s)
while(isdigit(c))
{ *w++ = c;
c = GET(s);
}
}
if ( !supress )
{ *w = '\0';
v = strtod(work, &w)
if ( w == work )
SCAN_ERROR(s);
switch(tsize)
{ case SZ_NORMAL:
{ float *fp = va_arg(args, float *);
*fp = v;
break;
}
case SZ_LONG:
{ double *fp = va_arg(args, double *);
*fp = v;
break;
}
}
done++;
}
fm++;
continue;
}
case 's':
if ( !supress )
{ char *sp = va_arg(args, char *);
while(!isblank(c) && field_width-- != 0)
{ *sp++ = c;
c = GET(s);
}
} else
while(!isblank(c) && field_width-- != 0)
c = GET(s);
fm++;
continue;
case 'c':
if ( !supress )
{ char *cp = va_arg(args, char *);
*cp = c;
}
c = GET(s);
fm++;
continue;
case '[':
{ char set[256];
memset(set, 0, sizeof(set));
fm++;
if ( *fm == ']' )
set[*fm++]++;
else if ( *fm == '^' )
{ fm++;
negate++;
}
while(*fm != ']')
{ if ( *fm == '-' )
}
}
}
} else /* normal character */
{ if ( c == *fm )
{ c = GET(s);
fm++;
continue;
}
break;
}
}
out:
UNGET(c, s);
return done;
}
#endif /*0*/
/*******************************
* FILTER STREAMS *
*******************************/
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Link two streams in a pipeline, where filter filters data for stream
`parent'. If parent is an output steam we have
application --> filter --> parent -->
If parent is an input stream we have
--> parent --> filter --> application
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
int
Sset_filter(IOSTREAM *parent, IOSTREAM *filter)
{ if ( !parent || parent->magic != SIO_MAGIC )
{ errno = EINVAL;
return -1;
}
if ( filter )
{ if ( filter->magic != SIO_MAGIC )
{ errno = EINVAL;
return -1;
}
}
parent->upstream = filter;
if ( filter )
filter->downstream = parent;
return 0;
}
/*******************************
* FILE STREAMS *
*******************************/
static ssize_t
Sread_file(void *handle, char *buf, size_t size)
{ intptr_t h = (intptr_t) handle;
ssize_t bytes;
for(;;)
{
#ifdef __WINDOWS__
bytes = read((int)h, buf, (int)size);
#else
bytes = read((int)h, buf, size);
#endif
if ( bytes == -1 && errno == EINTR )
{ if ( PL_handle_signals() < 0 )
{ errno = EPLEXCEPTION;
return -1;
}
continue;
}
return bytes;
}
}
static ssize_t
Swrite_file(void *handle, char *buf, size_t size)
{ intptr_t h = (intptr_t) handle;
ssize_t bytes;
for(;;)
{
#ifdef __WINDOWS__
bytes = write((int)h, buf, (int)size);
#else
bytes = write((int)h, buf, size);
#endif
if ( bytes == -1 && errno == EINTR )
{ if ( PL_handle_signals() < 0 )
{ errno = EPLEXCEPTION;
return -1;
}
continue;
}
return bytes;
}
}
static long
Sseek_file(void *handle, long pos, int whence)
{ intptr_t h = (intptr_t) handle;
/* cannot do EINTR according to man */
return lseek((int)h, pos, whence);
}
#ifdef O_LARGEFILES
static int64_t
Sseek_file64(void *handle, int64_t pos, int whence)
{ intptr_t h = (intptr_t) handle;
/* cannot do EINTR according to man */
return lseek((int)h, pos, whence);
}
#endif
static int
Sclose_file(void *handle)
{ intptr_t h = (intptr_t) handle;
int rc;
do
{ rc = close((int) h);
} while ( rc == -1 && errno == EINTR );
return rc;
}
static int
Scontrol_file(void *handle, int action, void *arg)
{ intptr_t h = (intptr_t) handle;
int fd = (int)h;
switch(action)
{ case SIO_GETSIZE:
{ intptr_t *rval = arg;
struct stat buf;
if ( fstat(fd, &buf) == 0 )
{ *rval = buf.st_size;
return 0;
}
return -1;
}
case SIO_SETENCODING:
case SIO_FLUSHOUTPUT:
return 0;
default:
return -1;
}
}
IOFUNCTIONS Sfilefunctions =
{ Sread_file,
Swrite_file,
Sseek_file,
Sclose_file,
Scontrol_file,
#ifdef O_LARGEFILES
Sseek_file64
#else
NULL
#endif
};
IOFUNCTIONS Sttyfunctions =
{ Sread_file,
Swrite_file,
NULL,
Sclose_file,
Scontrol_file,
#ifdef O_LARGEFILES
Sseek_file64
#else
NULL
#endif
};
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
(*) Windows isatty() is totally broken since VC9; crashing the
application instead of returning EINVAL on wrong values of fd. As we
provide the socket-id through Sfileno, this code crashes on
tcp_open_socket(). As ttys and its detection is of no value on Windows
anyway, we skip this. Second, Windows doesn't have fork(), so FD_CLOEXEC
is of no value.
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
IOSTREAM *
Snew(void *handle, int flags, IOFUNCTIONS *functions)
{ IOSTREAM *s;
if ( !(s = malloc(sizeof(IOSTREAM))) )
{ errno = ENOMEM;
return NULL;
}
memset((char *)s, 0, sizeof(IOSTREAM));
s->magic = SIO_MAGIC;
s->lastc = EOF;
s->flags = flags;
s->handle = handle;
s->functions = functions;
s->timeout = -1; /* infinite */
s->posbuf.lineno = 1;
s->encoding = ENC_ISO_LATIN_1;
#if CRLF_MAPPING
s->newline = SIO_NL_DOS;
#endif
if ( flags & SIO_RECORDPOS )
s->position = &s->posbuf;
#ifdef O_PLMT
if ( !(flags & SIO_NOMUTEX) )
{ if ( !(s->mutex = malloc(sizeof(recursiveMutex))) )
{ free(s);
return NULL;
}
recursiveMutexInit(s->mutex);
}
#endif
#ifndef __WINDOWS__ /* (*) */
{ int fd;
if ( (fd = Sfileno(s)) >= 0 )
{ if ( isatty(fd) )
s->flags |= SIO_ISATTY;
#if defined(F_SETFD) && defined(FD_CLOEXEC)
fcntl(fd, F_SETFD, FD_CLOEXEC);
#endif
}
}
#endif
return s;
}
#ifndef O_BINARY
#define O_BINARY 0
#endif
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Open a file. In addition to the normal arguments, "lr" means get a read
(shared-) lock on the file and "lw" means get an write (exclusive-)
lock. How much do we need to test here?
Note that the low-level open is always binary as O_TEXT open files
result in lost and corrupted data in some encodings (UTF-16 is one of
them). Sgetcode() and Sputcode() do the LF <-> CRLF mapping of
CRLF_MAPPING is defined.
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
IOSTREAM *
Sopen_file(const char *path, const char *how)
{ int fd;
int oflags = O_BINARY;
int flags = SIO_FILE|SIO_TEXT|SIO_RECORDPOS|SIO_FBUF;
int op = *how++;
intptr_t lfd;
enum {lnone=0,lread,lwrite} lock = lnone;
IOSTREAM *s;
IOENC enc = ENC_UNKNOWN;
int wait = TRUE;
for( ; *how; how++)
{ switch(*how)
{ case 'b': /* binary */
flags &= ~SIO_TEXT;
enc = ENC_OCTET;
break;
case 'r': /* no record */
flags &= ~SIO_RECORDPOS;
break;
case 'L': /* lock r: read, w: write */
wait = FALSE;
/*FALLTHROUGH*/
case 'l': /* lock r: read, w: write */
if ( *++how == 'r' )
lock = lread;
else if ( *how == 'w' )
lock = lwrite;
else
{ errno = EINVAL;
return NULL;
}
break;
default:
errno = EINVAL;
return NULL;
}
}
#if O_LARGEFILES && defined(O_LARGEFILE)
oflags |= O_LARGEFILE;
#endif
switch(op)
{ case 'w':
fd = open(path, O_WRONLY|O_CREAT|O_TRUNC|oflags, 0666);
flags |= SIO_OUTPUT;
break;
case 'a':
fd = open(path, O_WRONLY|O_CREAT|O_APPEND|oflags, 0666);
flags |= SIO_OUTPUT|SIO_APPEND;
break;
case 'u':
fd = open(path, O_WRONLY|O_CREAT|oflags, 0666);
flags |= SIO_OUTPUT|SIO_UPDATE;
break;
case 'r':
fd = open(path, O_RDONLY|oflags);
flags |= SIO_INPUT;
break;
default:
errno = EINVAL;
return NULL;
}
if ( fd < 0 )
return NULL;
if ( lock )
{
#ifdef FCNTL_LOCKS
struct flock buf;
memset(&buf, 0, sizeof(buf));
buf.l_type = (lock == lread ? F_RDLCK : F_WRLCK);
if ( fcntl(fd, wait ? F_SETLKW : F_SETLK, &buf) < 0 )
{ int save = errno;
close(fd);
errno = save;
return NULL;
}
#else /* we don't have locking */
#if __WINDOWS__
HANDLE h = (HANDLE)_get_osfhandle(fd);
OVERLAPPED ov;
int flags = 0;
if ( lock == lwrite )
flags |= LOCKFILE_EXCLUSIVE_LOCK;
if ( !wait )
flags |= LOCKFILE_FAIL_IMMEDIATELY;
memset(&ov, 0, sizeof(ov));
if ( !LockFileEx(h, flags,
0,
0, 0xfffffff,
&ov) )
{ close(fd);
errno = (wait ? EACCES : EAGAIN); /* TBD: proper error */
return NULL;
}
#else
close(fd);
errno = EINVAL;
return NULL;
#endif
#endif
}
lfd = (intptr_t)fd;
s = Snew((void *)lfd, flags, &Sfilefunctions);
if ( enc != ENC_UNKNOWN )
s->encoding = enc;
if ( lock )
s->flags |= SIO_ADVLOCK;
return s;
}
IOSTREAM *
Sfdopen(int fd, const char *type)
{ intptr_t lfd;
int flags = SIO_FILE|SIO_RECORDPOS|SIO_FBUF;
if ( fd < 0 )
{ errno = EINVAL;
return NULL;
}
#if defined(HAVE_FCNTL) && defined(F_GETFL)
if ( fcntl(fd, F_GETFL) == -1 )
return NULL;
#endif
if ( *type == 'r' )
{ flags |= SIO_INPUT;
} else if ( *type == 'w' )
{ flags |= SIO_OUTPUT;
} else
{ errno = EINVAL;
return NULL;
}
if ( type[1] != 'b' )
flags |= SIO_TEXT;
lfd = (intptr_t)fd;
return Snew((void *)lfd, flags, &Sfilefunctions);
}
/* MT: as long as s is valid, this should be ok
*/
int
Sfileno(IOSTREAM *s)
{ int n;
if ( s->flags & SIO_FILE )
{ intptr_t h = (intptr_t)s->handle;
n = (int)h;
} else if ( s->flags & SIO_PIPE )
{ n = fileno((FILE *)s->handle);
} else if ( s->functions->control &&
(*s->functions->control)(s->handle,
SIO_GETFILENO,
(void *)&n) == 0 )
{ ;
} else
{ errno = EINVAL;
n = -1; /* no file stream */
}
return n;
}
/*******************************
* PIPES *
*******************************/
#ifdef HAVE_POPEN
#ifdef __WINDOWS__
#include "windows/popen.c"
#ifdef popen
#undef popen
#endif
#define popen(cmd, how) pt_popen(cmd, how)
#ifdef pclose
#undef pclose
#endif
#define pclose(fd) pt_pclose(fd)
#endif
static ssize_t
Sread_pipe(void *handle, char *buf, size_t size)
{ FILE *fp = handle;
#ifdef __WINDOWS__
return read(fileno(fp), buf, (unsigned int)size);
#else
return read(fileno(fp), buf, size);
#endif
}
static ssize_t
Swrite_pipe(void *handle, char *buf, size_t size)
{ FILE *fp = handle;
#ifdef __WINDOWS__
return write(fileno(fp), buf, (unsigned int)size);
#else
return write(fileno(fp), buf, size);
#endif
}
static int
Sclose_pipe(void *handle)
{ FILE *fp = handle;
pclose(fp);
return 0;
}
IOFUNCTIONS Spipefunctions =
{ Sread_pipe,
Swrite_pipe,
(Sseek_function)0,
Sclose_pipe
};
IOSTREAM *
Sopen_pipe(const char *command, const char *type)
{ char mode[2];
FILE *fd;
#if 0
Sdprintf("Opening \"%s\", mode \"%s\" --> %p (%d)\n",
command, type, fd, errno);
#endif
mode[0] = type[0];
mode[1] = '\0';
if ( (fd = popen(command, mode)) )
{ int flags;
if ( *type == 'r' )
flags = SIO_PIPE|SIO_INPUT|SIO_FBUF;
else
flags = SIO_PIPE|SIO_OUTPUT|SIO_FBUF;
return Snew((void *)fd, flags, &Spipefunctions);
}
return NULL;
}
#endif /*HAVE_POPEN*/
/*******************************
* MEMORY STREAMS *
*******************************/
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Memory streams form a replacement for sprintf(), sscanf() and friends.
They allow regarding a piece of (for output) malloc() maintained memory
to serve as a temporary buffer.
MT: we assume these handles are not passed between threads
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
typedef struct
{ size_t here; /* `here' location */
size_t size; /* size of buffer */
size_t *sizep; /* pointer to size */
size_t allocated; /* allocated size */
char **buffer; /* allocated buffer */
int malloced; /* malloc() maintained */
} memfile;
void
Sfree(void *ptr) /* Windows: must free from same */
{ free(ptr); /* DLL */
}
static size_t
S__memfile_nextsize(size_t needed)
{ size_t size = 512;
while ( size < needed )
size *= 2;
return size;
}
static ssize_t
Swrite_memfile(void *handle, char *buf, size_t size)
{ memfile *mf = handle;
if ( mf->here + size + 1 >= mf->allocated )
{ size_t ns = S__memfile_nextsize(mf->here + size + 1);
char *nb;
if ( mf->allocated == 0 || !mf->malloced )
{ if ( !(nb = malloc(ns)) )
{ errno = ENOMEM;
return -1;
}
if ( !mf->malloced )
{ if ( *mf->buffer )
memcpy(nb, *mf->buffer, mf->allocated);
mf->malloced = TRUE;
}
} else
{ if ( !(nb = realloc(*mf->buffer, ns)) )
{ errno = ENOMEM;
return -1;
}
}
mf->allocated = ns;
*mf->buffer = nb;
}
memcpy(&(*mf->buffer)[mf->here], buf, size);
mf->here += size;
if ( mf->here > mf->size )
{ mf->size = mf->here;
if ( mf->sizep ) /* make externally known */
*mf->sizep = mf->size;
(*mf->buffer)[mf->size] = '\0';
}
return size;
}
static ssize_t
Sread_memfile(void *handle, char *buf, size_t size)
{ memfile *mf = handle;
if ( size + mf->here > mf->size )
{ if ( mf->here > mf->size )
size = 0;
else
size = mf->size - mf->here;
}
memcpy(buf, &(*mf->buffer)[mf->here], size);
mf->here += size;
return size;
}
static long
Sseek_memfile(void *handle, long offset, int whence)
{ memfile *mf = handle;
switch(whence)
{ case SIO_SEEK_SET:
break;
case SIO_SEEK_CUR:
offset += (long)mf->here; /* Win64: truncates */
break;
case SIO_SEEK_END:
offset = (long)mf->size - offset; /* Win64 */
break;
default:
errno = EINVAL;
return -1;
}
if ( offset < 0 || offset > (long)mf->size )
{ errno = EINVAL;
return -1;
}
mf->here = offset;
return offset;
}
static int
Sclose_memfile(void *handle)
{ memfile *mf = handle;
if ( mf )
{ free(mf);
return 0;
}
errno = EINVAL; /* not opened */
return -1;
}
IOFUNCTIONS Smemfunctions =
{ Sread_memfile,
Swrite_memfile,
Sseek_memfile,
Sclose_memfile
};
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Sopenmem(char **buffer, size_t *sizep, const char* mode)
Open a memory area as a stream. Output streams will automatically
resized using realloc() if *size = 0 or the stream is opened with mode
"wa".
If the buffer is allocated or enlarged, this is achieved using malloc()
or realloc(). In this case the returned buffer should be freed by the
caller when done. Example:
{ char buf[1024]; (don't allocate for small stuff)
char *s = buf;
IOSTREAM *fd;
size_t size = sizeof(buf);
fd = Sopenmem(&s, &size, "w");
...
Sclose(fd);
...
if ( s != buf ) (appearently moved)
Sfree(s);
}
Note: Its is NOT allows to access streams created with this call from
multiple threads. This is ok for all usage inside Prolog itself (often
through tellString()/toldString(). This call is intented to use write
and other output predicates to create strings.
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
IOSTREAM *
Sopenmem(char **buffer, size_t *sizep, const char *mode)
{ memfile *mf = malloc(sizeof(memfile));
int flags = SIO_FBUF|SIO_RECORDPOS|SIO_NOMUTEX;
size_t size;
if ( !mf )
{ errno = ENOMEM;
return NULL;
}
mf->malloced = FALSE;
switch(*mode)
{ case 'r':
flags |= SIO_INPUT;
if ( sizep == NULL || *sizep == (size_t)-1 )
size = (*buffer ? strlen(*buffer) : 0);
else
size = *sizep;
mf->size = size;
mf->allocated = size+1;
break;
case 'w':
flags |= SIO_OUTPUT;
mf->size = 0;
mf->allocated = (sizep ? *sizep : 0);
if ( *buffer == NULL || mode[1] == 'a' )
mf->malloced = TRUE;
if ( *buffer )
*buffer[0] = '\0';
if ( sizep )
*sizep = mf->size;
break;
default:
free(mf);
errno = EINVAL;
return NULL;
}
mf->sizep = sizep;
mf->here = 0;
mf->buffer = buffer;
return Snew(mf, flags, &Smemfunctions);
}
/*******************************
* STRINGS *
*******************************/
/* MT: we assume these handles are not passed between threads
*/
static ssize_t
Sread_string(void *handle, char *buf, size_t size)
{ return 0; /* signal EOF */
}
static ssize_t
Swrite_string(void *handle, char *buf, size_t size)
{ errno = ENOSPC; /* signal error */
return -1;
}
static int
Sclose_string(void *handle)
{ IOSTREAM *s = handle;
if ( s->flags & SIO_OUTPUT )
{ if ( s->bufp < s->limitp )
{ *s->bufp++ = '\0';
return 0;
} else
{ errno = ENOSPC; /* signal error */
return -1;
}
} else
return 0; /* input string */
}
IOFUNCTIONS Sstringfunctions =
{ Sread_string,
Swrite_string,
(Sseek_function)0,
Sclose_string
};
IOSTREAM *
Sopen_string(IOSTREAM *s, char *buf, size_t size, const char *mode)
{ int flags = SIO_FBUF|SIO_USERBUF;
if ( !s )
{ if ( !(s = malloc(sizeof(IOSTREAM))) )
{ errno = ENOMEM;
return NULL;
}
} else
flags |= SIO_STATIC;
memset((char *)s, 0, sizeof(IOSTREAM));
s->timeout = -1;
s->buffer = buf;
s->bufp = buf;
s->unbuffer = buf;
s->handle = s; /* for Sclose_string() */
s->functions = &Sstringfunctions;
s->encoding = ENC_ISO_LATIN_1;
switch(*mode)
{ case 'r':
if ( size == (size_t)-1 )
size = strlen(buf);
flags |= SIO_INPUT;
break;
case 'w':
flags |= SIO_OUTPUT;
break;
default:
errno = EINVAL;
return NULL;
}
s->flags = flags;
s->limitp = &buf[size];
s->magic = SIO_MAGIC;
return s;
}
/*******************************
* STANDARD HANDLES *
*******************************/
#define STDIO(n, f) { NULL, NULL, NULL, NULL, \
EOF, SIO_MAGIC, 0, f, {0, 0, 0}, NULL, \
((void *)(n)), &Sttyfunctions, \
0, NULL, \
(void (*)(void *))0, NULL, \
-1, \
0, \
ENC_ISO_LATIN_1 \
}
#define SIO_STDIO (SIO_FILE|SIO_STATIC|SIO_NOCLOSE|SIO_ISATTY|SIO_TEXT)
#define STDIO_STREAMS \
STDIO(0, SIO_STDIO|SIO_LBUF|SIO_INPUT|SIO_NOFEOF), /* Sinput */ \
STDIO(1, SIO_STDIO|SIO_LBUF|SIO_OUTPUT|SIO_REPPL), /* Soutput */ \
STDIO(2, SIO_STDIO|SIO_NBUF|SIO_OUTPUT|SIO_REPPL) /* Serror */
IOSTREAM S__iob[] =
{ STDIO_STREAMS
};
static const IOSTREAM S__iob0[] =
{ STDIO_STREAMS
};
/* vsc: Scleanup should reset init done */
static int done;
void
SinitStreams(void)
{
if ( !done++ )
{ int i;
IOENC enc = initEncoding();
for(i=0; i<=2; i++)
{ if ( !isatty(i) )
{ S__iob[i].flags &= ~SIO_ISATTY;
S__iob[i].functions = &Sfilefunctions; /* Check for pipe? */
}
if ( S__iob[i].encoding == ENC_ISO_LATIN_1 )
S__iob[i].encoding = enc;
#ifdef O_PLMT
S__iob[i].mutex = malloc(sizeof(recursiveMutex));
recursiveMutexInit(S__iob[i].mutex);
#endif
#if CRLF_MAPPING
_setmode(i, O_BINARY);
S__iob[i].newline = SIO_NL_DOS;
#endif
}
#ifdef __WINDOWS__
pt_init(); /* init popen() issues */
#endif
}
}
IOSTREAM *
S__getiob()
{ return S__iob;
}
/*******************************
* HOOKS *
*******************************/
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
This allows external packages (Prolog itself) to monitor the destruction
of streams.
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
typedef struct _close_hook
{ struct _close_hook *next;
void (*hook)(IOSTREAM *s);
} close_hook;
static close_hook *close_hooks;
static void
run_close_hooks(IOSTREAM *s)
{ close_hook *p;
for(p=close_hooks; p; p = p->next)
(*p->hook)(s);
if ( s->close_hook )
(*s->close_hook)(s->closure);
}
int
Sclosehook(void (*hook)(IOSTREAM *s))
{ close_hook *h = malloc(sizeof(*h));
if ( !h )
return -1;
h->next = close_hooks;
h->hook = hook;
close_hooks = h;
return 0;
}
/*******************************
* CLEANUP *
*******************************/
void
Sreset(void)
{ IOSTREAM *s;
if ( (s=Sinput) && s->magic == SIO_MAGIC )
{ s->bufp = s->limitp = s->buffer;
}
if ( (s=Soutput) && s->magic == SIO_MAGIC )
{ s->bufp = s->buffer;
}
if ( (s=Serror) && s->magic == SIO_MAGIC )
{ s->bufp = s->buffer;
}
}
void
Scleanup(void)
{ close_hook *p, *next;
int i;
for(p=close_hooks; p; p=next)
{ next = p->next;
free(p);
}
close_hooks = NULL;
for(i=0; i<=2; i++)
{ IOSTREAM *s = &S__iob[i];
s->bufp = s->buffer; /* avoid actual flush */
S__removebuf(s);
#ifdef O_PLMT
if ( S__iob[i].mutex )
{ recursiveMutex *m = S__iob[i].mutex;
S__iob[i].mutex = NULL;
recursiveMutexDelete(m);
free(m);
}
#endif
*s = S__iob0[i]; /* re-initialise */
}
done = 0;
}
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