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yap-6.3/os/charsio.c
Vítor Santos Costa 9ce6ba5186 init tab/1 steam
2015-11-05 15:39:04 +00:00

939 lines
27 KiB
C

/*************************************************************************
* *
* YAP Prolog *
* *
* Yap Prolog was developed at NCCUP - Universidade do Porto *
* *
* Copyright L.Damas, V.S.Costa and Universidade do Porto 1985-1997 *
* *
**************************************************************************
* *
* File: charcodes.c *
* Last rev: 5/2/88 *
* mods: *
* comments: Character codes and character conversion *
* *
*************************************************************************/
#ifdef SCCS
static char SccsId[] = "%W% %G%";
#endif
/*
* This file includes the definition of a pipe related IO.
*
*/
#include "Yap.h"
#include "Yatom.h"
#include "YapHeap.h"
#include "yapio.h"
#include <stdlib.h>
#if HAVE_UNISTD_H
#include <unistd.h>
#endif
#if HAVE_STDARG_H
#include <stdarg.h>
#endif
#ifdef _WIN32
#if HAVE_IO_H
/* Windows */
#include <io.h>
#endif
#if HAVE_SOCKET
#include <winsock2.h>
#endif
#include <windows.h>
#ifndef S_ISDIR
#define S_ISDIR(x) (((x)&_S_IFDIR) == _S_IFDIR)
#endif
#endif
#include "iopreds.h"
static Int get_code(USES_REGS1);
static Int get_byte(USES_REGS1);
// static Int past_eof( USES_REGS1);
static Int put_code(USES_REGS1);
static Int put_byte(USES_REGS1);
static Int skip(USES_REGS1);
static Int flush_output(USES_REGS1);
static Int flush_all_streams(USES_REGS1);
/**
* CharOfAtom: convert an atom into a single character.
*
* @param at the atom
*
* @return the char .
*/
INLINE_ONLY inline EXTERN Int CharOfAtom(Atom at) {
if (IsWideAtom(at)) {
return at->WStrOfAE[0];
} else {
return at->StrOfAE[0];
}
}
static int plUnGetc(int sno, int ch) {
return ungetc(ch, GLOBAL_Stream[sno].file);
}
Int Yap_peek(int sno) {
CACHE_REGS
Int ocharcount, olinecount, olinepos;
StreamDesc *s;
Int ch;
s = GLOBAL_Stream + sno;
ocharcount = s->charcount;
olinecount = s->linecount;
olinepos = s->linepos;
ch = s->stream_wgetc(sno);
s->charcount = ocharcount;
s->linecount = olinecount;
s->linepos = olinepos;
/* buffer the character */
if (s->encoding == LOCAL_encoding) {
ungetwc(ch, s->file);
} else {
/* do the ungetc as if a write .. */
int (*f)(int, int) = s->stream_putc;
s->stream_putc = plUnGetc;
put_wchar(sno, ch);
s->stream_putc = f;
}
return ch;
}
static Int dopeek_byte(int sno) {
Int ocharcount, olinecount, olinepos;
StreamDesc *s;
Int ch;
s = GLOBAL_Stream + sno;
ocharcount = s->charcount;
olinecount = s->linecount;
olinepos = s->linepos;
ch = GLOBAL_Stream[sno].stream_getc(sno);
s->charcount = ocharcount;
s->linecount = olinecount;
s->linepos = olinepos;
/* buffer the character */
ungetc(ch, s->file);
return ch;
}
static Int at_end_of_stream(USES_REGS1) { /* at_end_of_stream */
/* the next character is a EOF */
int sno = Yap_CheckStream(ARG1, Input_Stream_f, NULL);
Int out;
if (sno < 0)
return (FALSE);
out = GLOBAL_Stream[sno].status & Eof_Stream_f;
if (!out) {
if (GLOBAL_Stream[sno].status & Binary_Stream_f) {
out = (dopeek_byte(sno) < 0);
} else {
out = (Yap_peek(sno) < 0);
}
}
UNLOCK(GLOBAL_Stream[sno].streamlock);
return out;
}
static Int at_end_of_stream_0(USES_REGS1) { /* at_end_of_stream */
/* the next character is a EOF */
Int out;
int sno = LOCAL_c_input_stream;
out = GLOBAL_Stream[sno].status & Eof_Stream_f;
if (!out) {
out = (Yap_peek(sno) < 0);
}
UNLOCK(GLOBAL_Stream[sno].streamlock);
return out;
}
static int yap_fflush(int sno) {
Yap_ReadlineFlush(sno);
if ((GLOBAL_Stream[sno].status & Output_Stream_f) &&
!(GLOBAL_Stream[sno].status &
(Null_Stream_f | InMemory_Stream_f | Socket_Stream_f | Pipe_Stream_f |
Free_Stream_f))) {
return (fflush(GLOBAL_Stream[sno].file));
} else
return (0);
}
static Int get(USES_REGS1) { /* '$get'(Stream,-N) */
int sno = Yap_CheckTextStream(ARG1, Input_Stream_f, "get/2");
int ch;
// Int status;
if (sno < 0)
return FALSE;
// status = GLOBAL_Stream[sno].status;
while ((ch = GLOBAL_Stream[sno].stream_wgetc(sno)) <= 32 && ch >= 0)
;
UNLOCK(GLOBAL_Stream[sno].streamlock);
return (Yap_unify_constant(ARG2, MkIntegerTerm(ch)));
}
static Int get_char(USES_REGS1) { /* '$get'(Stream,-N) */
int sno = Yap_CheckTextStream(ARG1, Input_Stream_f, "get/2");
int ch;
// Int status;
if (sno < 0)
return FALSE;
// status = GLOBAL_Stream[sno].status;
ch = GLOBAL_Stream[sno].stream_wgetc(sno);
UNLOCK(GLOBAL_Stream[sno].streamlock);
return (Yap_unify_constant(ARG2, MkCharTerm(ch)));
}
static Int get_code(USES_REGS1) { /* get0(Stream,-N) */
int sno = Yap_CheckTextStream(ARG1, Input_Stream_f, "get0/2");
// Int status;
Int out;
if (sno < 0)
return (FALSE);
// status = GLOBAL_Stream[sno].status;
out = GLOBAL_Stream[sno].stream_wgetc(sno);
UNLOCK(GLOBAL_Stream[sno].streamlock);
return (Yap_unify_constant(ARG2, MkIntegerTerm(out)));
}
static Int get_1(USES_REGS1) { /* get_code1(Stream,-N) */
int sno = LOCAL_c_input_stream;
int ch;
// Int status;
LOCK(GLOBAL_Stream[sno].streamlock);
// status = GLOBAL_Stream[sno].status;
while ((ch = GLOBAL_Stream[sno].stream_wgetc(sno)) <= 32 && ch >= 0)
;
UNLOCK(GLOBAL_Stream[sno].streamlock);
return (Yap_unify_constant(ARG2, MkIntegerTerm(ch)));
}
static Int getcode_1(USES_REGS1) { /* get0(Stream,-N) */
int sno = LOCAL_c_input_stream;
// Int status;
Int out;
// status = GLOBAL_Stream[sno].status;
LOCK(GLOBAL_Stream[sno].streamlock);
out = GLOBAL_Stream[sno].stream_wgetc(sno);
UNLOCK(GLOBAL_Stream[sno].streamlock);
return (Yap_unify_constant(ARG1, MkIntegerTerm(out)));
}
static Int getchar_1(USES_REGS1) { /* get0(Stream,-N) */
int sno = LOCAL_c_input_stream;
// Int status;
Int out;
LOCK(GLOBAL_Stream[sno].streamlock);
// status = GLOBAL_Stream[sno].status;
out = GLOBAL_Stream[sno].stream_wgetc(sno);
UNLOCK(GLOBAL_Stream[sno].streamlock);
return (Yap_unify_constant(ARG1, MkCharTerm(out)));
}
static Int get0_line_codes(USES_REGS1) { /* '$get0'(Stream,-N) */
int sno = Yap_CheckTextStream(ARG1, Input_Stream_f, "get0/2");
// Int status;
Term out;
Int ch = '\0';
int rewind;
if (sno < 0)
return (FALSE);
rewind = FALSE;
// status = GLOBAL_Stream[sno].status;
out = read_line(sno);
UNLOCK(GLOBAL_Stream[sno].streamlock);
if (rewind)
return Yap_unify(MkPairTerm(MkIntegerTerm(ch), out), ARG2);
else
return Yap_unify(out, ARG2);
}
static Int get_byte(USES_REGS1) { /* '$get_byte'(Stream,-N) */
int sno = Yap_CheckStream(ARG1, Input_Stream_f, "get_byte/2");
Int status;
Term out;
if (sno < 0)
return (FALSE);
status = GLOBAL_Stream[sno].status;
if (!(status & Binary_Stream_f)
//&& strictISOFlag()
) {
UNLOCK(GLOBAL_Stream[sno].streamlock);
Yap_Error(PERMISSION_ERROR_INPUT_TEXT_STREAM, ARG1, "get_byte/2");
return (FALSE);
}
out = MkIntTerm(GLOBAL_Stream[sno].stream_getc(sno));
UNLOCK(GLOBAL_Stream[sno].streamlock);
return Yap_unify_constant(ARG2, out);
}
static Int get_byte_1(USES_REGS1) { /* '$get_byte'(Stream,-N) */
int sno = LOCAL_c_input_stream;
Int status;
Term out;
LOCK(GLOBAL_Stream[sno].streamlock);
status = GLOBAL_Stream[sno].status;
if (!(status & Binary_Stream_f)
// &&strictISOFlag()
) {
UNLOCK(GLOBAL_Stream[sno].streamlock);
Yap_Error(PERMISSION_ERROR_INPUT_TEXT_STREAM, ARG1, "get_byte/1");
return (FALSE);
}
out = MkIntTerm(GLOBAL_Stream[sno].stream_getc(sno));
UNLOCK(GLOBAL_Stream[sno].streamlock);
return Yap_unify_constant(ARG1, out);
}
static Int put_code_1(USES_REGS1) { /* '$put'(,N) */
int sno = LOCAL_c_output_stream, ch;
Term t2;
if (IsVarTerm(t2 = Deref(ARG1))) {
Yap_Error(INSTANTIATION_ERROR, t2, "put_code/1");
return FALSE;
} else if (!IsIntegerTerm(t2)) {
Yap_Error(TYPE_ERROR_INTEGER, t2, "put_code/1");
return FALSE;
} else if ((ch = IntegerOfTerm(t2)) < -1) {
Yap_Error(DOMAIN_ERROR_OUT_OF_RANGE, t2, "put_code/1");
return FALSE;
}
LOCK(GLOBAL_Stream[sno].streamlock);
GLOBAL_Stream[sno].stream_wputc(sno, (int)IntegerOfTerm(Deref(ARG2)));
/*
* if (!(GLOBAL_Stream[sno].status & Null_Stream_f))
* yap_fflush(GLOBAL_Stream[sno].file);
*/
UNLOCK(GLOBAL_Stream[sno].streamlock);
return (TRUE);
}
static Int put_code(USES_REGS1) { /* '$put'(Stream,N) */
int ch;
Term t2;
int sno;
if (IsVarTerm(t2 = Deref(ARG2))) {
Yap_Error(INSTANTIATION_ERROR, t2, "put_code/1");
return FALSE;
} else if (!IsIntegerTerm(t2)) {
Yap_Error(TYPE_ERROR_INTEGER, t2, "put_code/1");
return FALSE;
} else if ((ch = IntegerOfTerm(t2)) < -1) {
Yap_Error(DOMAIN_ERROR_OUT_OF_RANGE, t2, "put_code/1");
return FALSE;
}
sno = Yap_CheckTextStream(ARG1, Output_Stream_f, "put/2");
if (sno < 0)
return (FALSE);
if (GLOBAL_Stream[sno].status & Binary_Stream_f) {
UNLOCK(GLOBAL_Stream[sno].streamlock);
Yap_Error(PERMISSION_ERROR_OUTPUT_BINARY_STREAM, ARG1, "put/2");
return (FALSE);
}
GLOBAL_Stream[sno].stream_wputc(sno, ch);
/*
* if (!(GLOBAL_Stream[sno].status & Null_Stream_f))
* yap_fflush(GLOBAL_Stream[sno].file);
*/
UNLOCK(GLOBAL_Stream[sno].streamlock);
return (TRUE);
}
static Int put_char_1(USES_REGS1) { /* '$put'(,N) */
int sno = LOCAL_c_output_stream;
Term t2;
int ch;
if (IsVarTerm(t2 = Deref(ARG1))) {
Yap_Error(INSTANTIATION_ERROR, t2, "put_char/1");
return FALSE;
} else if (!IsAtomTerm(t2)) {
Yap_Error(TYPE_ERROR_INTEGER, t2, "put_char/1");
return FALSE;
} else if ((ch = CharOfAtom(AtomOfTerm(t2))) < -1) {
Yap_Error(DOMAIN_ERROR_OUT_OF_RANGE, t2, "put_char/1");
return FALSE;
}
LOCK(GLOBAL_Stream[sno].streamlock);
if (GLOBAL_Stream[sno].status & Binary_Stream_f) {
UNLOCK(GLOBAL_Stream[sno].streamlock);
Yap_Error(PERMISSION_ERROR_OUTPUT_BINARY_STREAM, ARG1, "put/2");
return (FALSE);
}
GLOBAL_Stream[sno].stream_wputc(sno, ch);
/*
* if (!(GLOBAL_Stream[sno].status & Null_Stream_f))
* yap_fflush(GLOBAL_Stream[sno].file);
*/
UNLOCK(GLOBAL_Stream[sno].streamlock);
return (TRUE);
}
static Int put_char(USES_REGS1) { /* '$put'(Stream,N) */
Term t2;
int ch;
int sno;
if (IsVarTerm(t2 = Deref(ARG2))) {
Yap_Error(INSTANTIATION_ERROR, t2, "put_char/1");
return FALSE;
} else if (!IsAtomTerm(t2)) {
Yap_Error(TYPE_ERROR_INTEGER, t2, "put_char/1");
return FALSE;
} else if ((ch = CharOfAtom(AtomOfTerm(t2))) < -1) {
Yap_Error(DOMAIN_ERROR_OUT_OF_RANGE, t2, "put_char/1");
return FALSE;
}
sno = Yap_CheckTextStream(ARG1, Output_Stream_f, "put/2");
if (sno < 0)
return (FALSE);
if (GLOBAL_Stream[sno].status & Binary_Stream_f) {
UNLOCK(GLOBAL_Stream[sno].streamlock);
Yap_Error(PERMISSION_ERROR_OUTPUT_BINARY_STREAM, ARG1, "put/2");
return (FALSE);
}
GLOBAL_Stream[sno].stream_wputc(sno, (int)IntegerOfTerm(Deref(ARG2)));
/*
* if (!(GLOBAL_Stream[sno].status & Null_Stream_f))
* yap_fflush(GLOBAL_Stream[sno].file);
*/
UNLOCK(GLOBAL_Stream[sno].streamlock);
return (TRUE);
}
static Int tab_1(USES_REGS1) { /* nl */
int sno = LOCAL_c_output_stream;
Term t2;
Int tabs, i;
if (IsVarTerm(t2 = Deref(ARG2))) {
Yap_Error(INSTANTIATION_ERROR, t2, "put_char/1");
return FALSE;
} else if (!IsIntegerTerm(t2)) {
Yap_Error(TYPE_ERROR_INTEGER, t2, "put_char/1");
return FALSE;
} else if ((tabs = IntegerOfTerm(t2)) < 0) {
Yap_Error(DOMAIN_ERROR_OUT_OF_RANGE, t2, "tab/1");
return FALSE;
}
LOCK(GLOBAL_Stream[sno].streamlock);
if (GLOBAL_Stream[sno].status & Binary_Stream_f) {
UNLOCK(GLOBAL_Stream[sno].streamlock);
Yap_Error(PERMISSION_ERROR_OUTPUT_BINARY_STREAM, ARG1, "nl/0");
return (FALSE);
}
for (i = 0; i < tabs; i++)
GLOBAL_Stream[sno].stream_wputc(sno, ' ');
/*
* if (!(GLOBAL_Stream[sno].status & Null_Stream_f))
* yap_fflush(GLOBAL_Stream[sno].file);
*/
UNLOCK(GLOBAL_Stream[sno].streamlock);
return (TRUE);
}
static Int tab(USES_REGS1) { /* nl(Stream) */
int sno;
Term t2;
Int tabs, i;
if (IsVarTerm(t2 = Deref(ARG2))) {
Yap_Error(INSTANTIATION_ERROR, t2, "put_char/1");
return FALSE;
} else if (!IsIntegerTerm(t2)) {
Yap_Error(TYPE_ERROR_INTEGER, t2, "put_char/1");
return FALSE;
} else if ((tabs = IntegerOfTerm(t2)) < 0) {
Yap_Error(DOMAIN_ERROR_OUT_OF_RANGE, t2, "tab/1");
return FALSE;
}
sno = Yap_CheckTextStream(ARG1, Output_Stream_f, "nl/1");
if (sno < 0)
return (FALSE);
if (GLOBAL_Stream[sno].status & Binary_Stream_f) {
UNLOCK(GLOBAL_Stream[sno].streamlock);
Yap_Error(PERMISSION_ERROR_OUTPUT_BINARY_STREAM, ARG1, "nl/0");
return (FALSE);
}
for (i = 0; i < tabs; i++)
GLOBAL_Stream[sno].stream_wputc(sno, ' ');
/*
* if (!(GLOBAL_Stream[sno].status & Null_Stream_f))
* yap_fflush(GLOBAL_Stream[sno].file);
*/
UNLOCK(GLOBAL_Stream[sno].streamlock);
return (TRUE);
}
static Int nl_1(USES_REGS1) { /* nl */
int sno = LOCAL_c_output_stream;
LOCK(GLOBAL_Stream[sno].streamlock);
if (GLOBAL_Stream[sno].status & Binary_Stream_f) {
UNLOCK(GLOBAL_Stream[sno].streamlock);
Yap_Error(PERMISSION_ERROR_OUTPUT_BINARY_STREAM, ARG1, "nl/0");
return (FALSE);
}
GLOBAL_Stream[sno].stream_wputc(sno, 10);
/*
* if (!(GLOBAL_Stream[sno].status & Null_Stream_f))
* yap_fflush(GLOBAL_Stream[sno].file);
*/
UNLOCK(GLOBAL_Stream[sno].streamlock);
return (TRUE);
}
static Int nl(USES_REGS1) { /* nl(Stream) */
int sno = Yap_CheckTextStream(ARG1, Output_Stream_f, "nl/1");
if (sno < 0)
return (FALSE);
if (GLOBAL_Stream[sno].status & Binary_Stream_f) {
UNLOCK(GLOBAL_Stream[sno].streamlock);
Yap_Error(PERMISSION_ERROR_OUTPUT_BINARY_STREAM, ARG1, "put/2");
return (FALSE);
}
GLOBAL_Stream[sno].stream_wputc(sno, 10);
/*
* if (!(GLOBAL_Stream[sno].status & Null_Stream_f))
* yap_fflush(GLOBAL_Stream[sno].file);
*/
UNLOCK(GLOBAL_Stream[sno].streamlock);
return (TRUE);
}
static Int put_byte(USES_REGS1) { /* '$put_byte'(Stream,N) */
Term t2;
Int ch;
if (IsVarTerm(t2 = Deref(ARG2))) {
Yap_Error(INSTANTIATION_ERROR, t2, "put_code/2");
return FALSE;
} else if (!IsIntegerTerm(t2)) {
Yap_Error(TYPE_ERROR_BYTE, t2, "put_code/2");
return FALSE;
} else if ((ch = IntegerOfTerm(t2)) < -1) {
Yap_Error(DOMAIN_ERROR_OUT_OF_RANGE, t2, "put_code/1");
return FALSE;
}
int sno = Yap_CheckStream(ARG1, Output_Stream_f, "put/2");
if (sno < 0)
return (FALSE);
if (!(GLOBAL_Stream[sno].status & Binary_Stream_f)
// && strictISOFlag()
) {
UNLOCK(GLOBAL_Stream[sno].streamlock);
Yap_Error(PERMISSION_ERROR_OUTPUT_TEXT_STREAM, ARG1, NULL);
return false;
}
GLOBAL_Stream[sno].stream_putc(sno, ch);
/*
* if (!(GLOBAL_Stream[sno].status & Null_Stream_f))
* yap_fflush(GLOBAL_Stream[sno].file);
*/
UNLOCK(GLOBAL_Stream[sno].streamlock);
return (TRUE);
}
static Int put_byte_1(USES_REGS1) { /* '$put_byte'(Stream,N) */
Term t2;
Int ch;
int sno = LOCAL_c_output_stream;
if (IsVarTerm(t2 = Deref(ARG1))) {
Yap_Error(INSTANTIATION_ERROR, t2, "put_code/1");
return FALSE;
} else if (!IsIntegerTerm(t2)) {
Yap_Error(TYPE_ERROR_BYTE, t2, "put_code/1");
return FALSE;
} else if ((ch = IntegerOfTerm(t2)) < -1) {
Yap_Error(DOMAIN_ERROR_OUT_OF_RANGE, t2, "put_code/1");
return FALSE;
}
LOCK(GLOBAL_Stream[sno].streamlock);
if (!(GLOBAL_Stream[sno].status & Binary_Stream_f)
//&& strictISOFlag()
) {
UNLOCK(GLOBAL_Stream[sno].streamlock);
Yap_Error(PERMISSION_ERROR_OUTPUT_TEXT_STREAM, ARG1, "get0/2");
return (FALSE);
}
GLOBAL_Stream[sno].stream_putc(sno, ch);
UNLOCK(GLOBAL_Stream[sno].streamlock);
return (TRUE);
}
static Int skip_1(USES_REGS1) { /* '$skip'(Stream,N) */
Int n;
Term t2;
int sno;
int ch;
if (IsVarTerm(t2 = Deref(ARG2))) {
Yap_Error(INSTANTIATION_ERROR, t2, "skip/2");
return FALSE;
} else if (!IsIntegerTerm(t2)) {
Yap_Error(TYPE_ERROR_INTEGER, t2, "skip/2");
return FALSE;
} else if ((n = IntegerOfTerm(t2)) < 0) {
Yap_Error(DOMAIN_ERROR_OUT_OF_RANGE, t2, "skip/2");
return FALSE;
}
sno = Yap_CheckTextStream(ARG1, Input_Stream_f, "skip/2");
if (sno < 0)
return (FALSE);
while ((ch = GLOBAL_Stream[sno].stream_wgetc(sno)) != n && ch != -1)
;
UNLOCK(GLOBAL_Stream[sno].streamlock);
return (TRUE);
}
static Int skip(USES_REGS1) { /* '$skip'(Stream,N) */
Int n;
Term t2;
int sno;
int ch;
if (IsVarTerm(t2 = Deref(ARG2))) {
Yap_Error(INSTANTIATION_ERROR, t2, "skip/2");
return FALSE;
} else if (!IsIntegerTerm(t2)) {
Yap_Error(TYPE_ERROR_INTEGER, t2, "skip/2");
return FALSE;
} else if ((n = IntegerOfTerm(t2)) < 0) {
Yap_Error(DOMAIN_ERROR_OUT_OF_RANGE, t2, "skip/2");
return FALSE;
}
sno = LOCAL_c_input_stream;
LOCK(GLOBAL_Stream[sno].streamlock);
while ((ch = GLOBAL_Stream[sno].stream_wgetc(sno)) != n && ch != -1)
;
UNLOCK(GLOBAL_Stream[sno].streamlock);
return (TRUE);
}
/**
* @pred flush_output(+Stream)
*
* Flush the stream _Stream_, that is, make sure all pending output is committed
* before any further execution.
*
* @param +_Stream_
*
*/
static Int flush_output(USES_REGS1) { /* flush_output(Stream) */
int sno = Yap_CheckStream(ARG1, Output_Stream_f, "flush_output/1");
if (sno < 0)
return (FALSE);
yap_fflush(sno);
UNLOCK(GLOBAL_Stream[sno].streamlock);
return (TRUE);
}
/**
* @pred flush_output
*
* Flush the current output stream, that is, make sure all pending output is
*committed
* before any further execution. By default this is user_output, but it may be
* changed by current_output/1.
*
*/
static Int flush_output0(USES_REGS1) { /* flush_output */
yap_fflush(LOCAL_c_output_stream);
return (TRUE);
}
static Int flush_all_streams(USES_REGS1) { /* $flush_all_streams */
#if BROKEN_FFLUSH_NULL
int i;
for (i = 0; i < MaxStreams; ++i) {
LOCK(GLOBAL_Stream[i].streamlock);
yap_fflush(i);
UNLOCK(GLOBAL_Stream[i].streamlock);
}
#else
fflush(NULL);
#endif
return TRUE;
}
/** @pred peek(+ _S_, - _C_) is deprecated
If _C_ is unbound, or is the code for a character, and
the stream _S_ is a text stream, read the next character from the
current stream and unify its code with _C_, while
leaving the current stream position unaltered.
*/
/** @pred peek_code(+ _S_, - _C_) is iso
If _C_ is unbound, or is the code for a character, and
the stream _S_ is a text stream, read the next character from the
current stream and unify its code with _C_, while
leaving the current stream position unaltered.
*/
static Int peek_code(USES_REGS1) { /* at_end_of_stream */
/* the next character is a EOF */
int sno = Yap_CheckTextStream(ARG1, Input_Stream_f, "peek/2");
Int ch;
if (sno < 0)
return FALSE;
if (GLOBAL_Stream[sno].status & Binary_Stream_f) {
UNLOCK(GLOBAL_Stream[sno].streamlock);
Yap_Error(PERMISSION_ERROR_INPUT_BINARY_STREAM, ARG1, "peek_code/2");
return FALSE;
}
if ((ch = Yap_peek(sno)) < 0) {
#ifdef PEEK_EOF
UNLOCK(GLOBAL_Stream[sno].streamlock);
return false;
#endif
}
UNLOCK(GLOBAL_Stream[sno].streamlock);
return (Yap_unify_constant(ARG2, MkIntTerm(ch)));
}
/** @pred peek_code( - _C_) is iso
If _C_ is unbound, or is the code for a character, and
the current input stream is a text stream, read the next character from the
current stream and unify its code with _C_, while
leaving the current stream position unaltered.
*/
static Int peek_code_1(USES_REGS1) { /* at_end_of_stream */
/* the next character is a EOF */
int sno = LOCAL_c_input_stream;
Int ch;
LOCK(GLOBAL_Stream[sno].streamlock);
if (GLOBAL_Stream[sno].status & Binary_Stream_f) {
UNLOCK(GLOBAL_Stream[sno].streamlock);
Yap_Error(PERMISSION_ERROR_INPUT_BINARY_STREAM, ARG1, "peek_code/2");
return FALSE;
}
if ((ch = Yap_peek(sno)) < 0) {
#ifdef PEEK_EOF
UNLOCK(GLOBAL_Stream[sno].streamlock);
return false;
#endif
}
UNLOCK(GLOBAL_Stream[sno].streamlock);
return (Yap_unify_constant(ARG1, MkIntTerm(ch)));
}
/** @pred peek_byte(+Stream, - _C_) is iso
If _C_ is unbound, or is a character code, and _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 Int peek_byte(USES_REGS1) { /* at_end_of_stream */
/* the next character is a EOF */
int sno = Yap_CheckStream(ARG1, Input_Stream_f, "peek_byte/2");
Int ch;
if (sno < 0)
return (FALSE);
if (!(GLOBAL_Stream[sno].status & Binary_Stream_f)) {
UNLOCK(GLOBAL_Stream[sno].streamlock);
Yap_Error(PERMISSION_ERROR_INPUT_STREAM, ARG1, "peek_byte/2");
return (FALSE);
}
if ((ch = dopeek_byte(sno)) < 0) {
#ifdef PEEK_EOF
UNLOCK(GLOBAL_Stream[sno].streamlock);
return false;
#endif
}
UNLOCK(GLOBAL_Stream[sno].streamlock);
return (Yap_unify_constant(ARG2, MkIntTerm(ch)));
}
/** @pred peek_byte( - _C_) is iso
If _C_ is unbound, or is a character code, and _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 Int peek_byte_1(USES_REGS1) { /* at_end_of_stream */
/* the next character is a EOF */
int sno = LOCAL_c_input_stream;
Int ch;
if (sno < 0)
return (FALSE);
LOCK(GLOBAL_Stream[sno].streamlock);
if (!(GLOBAL_Stream[sno].status & Binary_Stream_f)) {
UNLOCK(GLOBAL_Stream[sno].streamlock);
Yap_Error(PERMISSION_ERROR_INPUT_TEXT_STREAM, ARG1, "peek_byte/2");
return (FALSE);
}
if ((ch = dopeek_byte(sno)) < 0) {
#ifdef PEEK_EOF
UNLOCK(GLOBAL_Stream[sno].streamlock);
return false;
#endif
}
UNLOCK(GLOBAL_Stream[sno].streamlock);
return (Yap_unify_constant(ARG2, MkIntTerm(ch)));
}
/** @pred peek_char(+_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 the current stream and unify the
atom with _C_, while leaving the stream position unaltered.
*/
static Int peek_char(USES_REGS1) {
/* the next character is a EOF */
int sno = Yap_CheckTextStream(ARG1, Input_Stream_f, "peek/2");
wchar_t wsinp[2];
Int ch;
if (sno < 0)
return false;
if ((GLOBAL_Stream[sno].status & Binary_Stream_f)) {
UNLOCK(GLOBAL_Stream[sno].streamlock);
Yap_Error(PERMISSION_ERROR_INPUT_TEXT_STREAM, ARG1, "peek_byte/2");
return (FALSE);
}
if ((ch = Yap_peek(sno)) < 0) {
UNLOCK(GLOBAL_Stream[sno].streamlock);
return Yap_unify_constant(ARG2, MkAtomTerm(AtomEof));
}
UNLOCK(GLOBAL_Stream[sno].streamlock);
wsinp[1] = '\0';
wsinp[0] = ch;
return Yap_unify_constant(ARG2, MkAtomTerm(Yap_LookupMaybeWideAtom(wsinp)));
}
/** @pred peek_char( - _C_) is iso
If _C_ is unbound, or is a character code, and the current input stream is a
binary stream, read the next byte from the current stream and unify the
atom with _C_, while leaving the stream position unaltered.
*/
static Int peek_char_1(USES_REGS1) {
/* the next character is a EOF */
int sno = LOCAL_c_input_stream;
wchar_t wsinp[2];
Int ch;
LOCK(GLOBAL_Stream[sno].streamlock);
if ((ch = Yap_peek(sno)) < 0) {
UNLOCK(GLOBAL_Stream[sno].streamlock);
return Yap_unify_constant(ARG2, MkAtomTerm(AtomEof));
// return false;
}
UNLOCK(GLOBAL_Stream[sno].streamlock);
wsinp[1] = '\0';
wsinp[0] = ch;
return Yap_unify_constant(ARG2, MkAtomTerm(Yap_LookupMaybeWideAtom(wsinp)));
}
/** @pred peek(+ _S_, - _C_) is deprecated
If _C_ is unbound, or is the code for a character, and
the stream _S_ is a text stream, read the next character from the
current stream and unify its code with _C_, while
leaving the current stream position unaltered.
Please use the ISO built-in peek_code/2.
*/
/** @pred peek( - _C_) is iso
If _C_ is unbound, or is the code for a character, and
the currrent input stream is a text stream, read the next character from the
current stream and unify its code with _C_, while
leaving the current stream position unaltered.
*/
void Yap_flush(void) { CACHE_REGS(void)flush_all_streams(PASS_REGS1); }
void Yap_FlushStreams(void) { CACHE_REGS(void)flush_all_streams(PASS_REGS1); }
void Yap_InitCharsio(void) {
Yap_InitCPred("get", 2, get, SafePredFlag | SyncPredFlag);
Yap_InitCPred("get_code", 2, get_code, SafePredFlag | SyncPredFlag);
Yap_InitCPred("get_char", 2, get_char, SafePredFlag | SyncPredFlag);
Yap_InitCPred("get0", 2, get_code, SafePredFlag | SyncPredFlag);
Yap_InitCPred("get", 1, get_1, SafePredFlag | SyncPredFlag);
Yap_InitCPred("get_code", 1, getcode_1, SafePredFlag | SyncPredFlag);
Yap_InitCPred("get_char", 1, getchar_1, SafePredFlag | SyncPredFlag);
Yap_InitCPred("get0", 1, getcode_1, SafePredFlag | SyncPredFlag);
Yap_InitCPred("$get0_line_codes", 2, get0_line_codes,
SafePredFlag | SyncPredFlag | HiddenPredFlag);
Yap_InitCPred("get_byte", 2, get_byte, SafePredFlag | SyncPredFlag);
Yap_InitCPred("get_byte", 1, get_byte_1, SafePredFlag | SyncPredFlag);
Yap_InitCPred("put", 1, put_code_1, SafePredFlag | SyncPredFlag);
Yap_InitCPred("put", 2, put_code, SafePredFlag | SyncPredFlag);
Yap_InitCPred("put_code", 1, put_code_1, SafePredFlag | SyncPredFlag);
Yap_InitCPred("put_code", 2, put_code, SafePredFlag | SyncPredFlag);
Yap_InitCPred("put_char", 1, put_char_1, SafePredFlag | SyncPredFlag);
Yap_InitCPred("put_char", 2, put_char, SafePredFlag | SyncPredFlag);
Yap_InitCPred("put_byte", 2, put_byte, SafePredFlag | SyncPredFlag);
Yap_InitCPred("put_byte", 1, put_byte_1, SafePredFlag | SyncPredFlag);
Yap_InitCPred("put_char", 2, put_char, SafePredFlag | SyncPredFlag);
Yap_InitCPred("put_char1", 1, put_char_1, SafePredFlag | SyncPredFlag);
Yap_InitCPred("tab", 2, tab, SafePredFlag | SyncPredFlag);
Yap_InitCPred("tab1", 1, tab_1, SafePredFlag | SyncPredFlag);
Yap_InitCPred("nl", 0, nl_1, SafePredFlag | SyncPredFlag);
Yap_InitCPred("nl", 1, nl, SafePredFlag | SyncPredFlag);
Yap_InitCPred("$flush_all_streams", 0, flush_all_streams,
SafePredFlag | SyncPredFlag | HiddenPredFlag);
Yap_InitCPred("flush_output", 1, flush_output, SafePredFlag | SyncPredFlag);
Yap_InitCPred("flush_output", 0, flush_output0, SafePredFlag | SyncPredFlag);
Yap_InitCPred("at_end_of_stream", 1, at_end_of_stream,
SafePredFlag | SyncPredFlag);
Yap_InitCPred("at_end_of_stream_0", 0, at_end_of_stream_0,
SafePredFlag | SyncPredFlag);
// Yap_InitCPred ("$past_eof", 1, past_eof, SafePredFlag|SyncPredFlag);
Yap_InitCPred("peek", 2, peek_code, SafePredFlag | SyncPredFlag);
Yap_InitCPred("peek_code", 2, peek_code, SafePredFlag | SyncPredFlag);
Yap_InitCPred("peek_char", 2, peek_char, SafePredFlag | SyncPredFlag);
Yap_InitCPred("peek_byte", 2, peek_byte, SafePredFlag | SyncPredFlag);
Yap_InitCPred("peek", 1, peek_code_1, SafePredFlag | SyncPredFlag);
Yap_InitCPred("peek_code", 1, peek_code_1, SafePredFlag | SyncPredFlag);
Yap_InitCPred("peek_char", 1, peek_char_1, SafePredFlag | SyncPredFlag);
Yap_InitCPred("peek_byte", 1, peek_byte_1, SafePredFlag | SyncPredFlag);
Yap_InitCPred("skip", 2, skip, SafePredFlag | SyncPredFlag);
Yap_InitCPred("skip1", 1, skip_1, SafePredFlag | SyncPredFlag);
Yap_InitCPred("tab", 2, tab, SafePredFlag | SyncPredFlag);
Yap_InitCPred("tab1", 1, tab_1, SafePredFlag | SyncPredFlag);
}