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yap-6.3/os/charsio.c

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2015-06-18 00:59:10 +01:00
/*************************************************************************
* *
* 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>
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#endif
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#if HAVE_SOCKET
#include <winsock2.h>
#endif
#include <windows.h>
#ifndef S_ISDIR
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#define S_ISDIR(x) (((x)&_S_IFDIR) == _S_IFDIR)
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#endif
#endif
#include "iopreds.h"
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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);
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/**
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* CharOfAtom: convert an atom into a single character.
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*
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* @param at the atom
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*
* @return the char .
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*/
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INLINE_ONLY inline EXTERN Int CharOfAtom(Atom at) {
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if (IsWideAtom(at)) {
return at->WStrOfAE[0];
} else {
return at->StrOfAE[0];
}
}
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static int plUnGetc(int sno, int ch) {
return ungetc(ch, GLOBAL_Stream[sno].file);
}
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Int Yap_peek(int sno) {
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CACHE_REGS
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Int ocharcount, olinecount, olinepos;
StreamDesc *s;
Int ch;
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s = GLOBAL_Stream + sno;
ocharcount = s->charcount;
olinecount = s->linecount;
olinepos = s->linepos;
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ch = s->stream_wgetc(sno);
s->charcount = ocharcount;
s->linecount = olinecount;
s->linepos = olinepos;
/* buffer the character */
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if (s->encoding == LOCAL_encoding) {
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ungetwc(ch, s->file);
} else {
/* do the ungetc as if a write .. */
int (*f)(int, int) = s->stream_putc;
s->stream_putc = plUnGetc;
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put_wchar(sno, ch);
s->stream_putc = f;
}
return ch;
}
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static Int dopeek_byte(int sno) {
Int ocharcount, olinecount, olinepos;
StreamDesc *s;
Int ch;
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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;
}
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static Int at_end_of_stream(USES_REGS1) { /* at_end_of_stream */
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/* the next character is a EOF */
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int sno = Yap_CheckStream(ARG1, Input_Stream_f, NULL);
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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) {
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out = (dopeek_byte(sno) < 0);
} else {
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out = (Yap_peek(sno) < 0);
}
}
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UNLOCK(GLOBAL_Stream[sno].streamlock);
return out;
}
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static Int at_end_of_stream_0(USES_REGS1) { /* at_end_of_stream */
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/* the next character is a EOF */
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Int out;
int sno = LOCAL_c_input_stream;
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out = GLOBAL_Stream[sno].status & Eof_Stream_f;
if (!out) {
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out = (Yap_peek(sno) < 0);
}
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UNLOCK(GLOBAL_Stream[sno].streamlock);
return out;
}
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static int yap_fflush(int sno) {
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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));
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} else
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return (0);
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}
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static Int get(USES_REGS1) { /* '$get'(Stream,-N) */
int sno = Yap_CheckTextStream(ARG1, Input_Stream_f, "get/2");
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int ch;
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// Int status;
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if (sno < 0)
return FALSE;
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// status = GLOBAL_Stream[sno].status;
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while ((ch = GLOBAL_Stream[sno].stream_wgetc(sno)) <= 32 && ch >= 0)
;
UNLOCK(GLOBAL_Stream[sno].streamlock);
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return (Yap_unify_constant(ARG2, MkIntegerTerm(ch)));
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}
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static Int get_char(USES_REGS1) { /* '$get'(Stream,-N) */
int sno = Yap_CheckTextStream(ARG1, Input_Stream_f, "get/2");
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int ch;
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// Int status;
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if (sno < 0)
return FALSE;
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// status = GLOBAL_Stream[sno].status;
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ch = GLOBAL_Stream[sno].stream_wgetc(sno);
UNLOCK(GLOBAL_Stream[sno].streamlock);
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return (Yap_unify_constant(ARG2, MkCharTerm(ch)));
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}
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static Int get_code(USES_REGS1) { /* get0(Stream,-N) */
int sno = Yap_CheckTextStream(ARG1, Input_Stream_f, "get0/2");
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// Int status;
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Int out;
if (sno < 0)
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return (FALSE);
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// status = GLOBAL_Stream[sno].status;
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out = GLOBAL_Stream[sno].stream_wgetc(sno);
UNLOCK(GLOBAL_Stream[sno].streamlock);
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return (Yap_unify_constant(ARG2, MkIntegerTerm(out)));
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}
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static Int get_1(USES_REGS1) { /* get_code1(Stream,-N) */
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int sno = LOCAL_c_input_stream;
int ch;
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// Int status;
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LOCK(GLOBAL_Stream[sno].streamlock);
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// status = GLOBAL_Stream[sno].status;
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while ((ch = GLOBAL_Stream[sno].stream_wgetc(sno)) <= 32 && ch >= 0)
;
UNLOCK(GLOBAL_Stream[sno].streamlock);
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return (Yap_unify_constant(ARG2, MkIntegerTerm(ch)));
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}
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static Int getcode_1(USES_REGS1) { /* get0(Stream,-N) */
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int sno = LOCAL_c_input_stream;
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// Int status;
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Int out;
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// status = GLOBAL_Stream[sno].status;
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LOCK(GLOBAL_Stream[sno].streamlock);
out = GLOBAL_Stream[sno].stream_wgetc(sno);
UNLOCK(GLOBAL_Stream[sno].streamlock);
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return (Yap_unify_constant(ARG1, MkIntegerTerm(out)));
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}
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static Int getchar_1(USES_REGS1) { /* get0(Stream,-N) */
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int sno = LOCAL_c_input_stream;
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// Int status;
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Int out;
LOCK(GLOBAL_Stream[sno].streamlock);
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// status = GLOBAL_Stream[sno].status;
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out = GLOBAL_Stream[sno].stream_wgetc(sno);
UNLOCK(GLOBAL_Stream[sno].streamlock);
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return (Yap_unify_constant(ARG1, MkCharTerm(out)));
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}
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static Int get0_line_codes(USES_REGS1) { /* '$get0'(Stream,-N) */
int sno = Yap_CheckTextStream(ARG1, Input_Stream_f, "get0/2");
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// Int status;
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Term out;
Int ch = '\0';
int rewind;
if (sno < 0)
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return (FALSE);
rewind = FALSE;
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// status = GLOBAL_Stream[sno].status;
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out = read_line(sno);
UNLOCK(GLOBAL_Stream[sno].streamlock);
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if (rewind)
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return Yap_unify(MkPairTerm(MkIntegerTerm(ch), out), ARG2);
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else
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return Yap_unify(out, ARG2);
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}
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static Int get_byte(USES_REGS1) { /* '$get_byte'(Stream,-N) */
int sno = Yap_CheckStream(ARG1, Input_Stream_f, "get_byte/2");
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Int status;
Term out;
if (sno < 0)
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return (FALSE);
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status = GLOBAL_Stream[sno].status;
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if (!(status & Binary_Stream_f)
//&& strictISOFlag()
) {
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UNLOCK(GLOBAL_Stream[sno].streamlock);
Yap_Error(PERMISSION_ERROR_INPUT_TEXT_STREAM, ARG1, "get_byte/2");
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return (FALSE);
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}
out = MkIntTerm(GLOBAL_Stream[sno].stream_getc(sno));
UNLOCK(GLOBAL_Stream[sno].streamlock);
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return Yap_unify_constant(ARG2, out);
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}
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static Int get_byte_1(USES_REGS1) { /* '$get_byte'(Stream,-N) */
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int sno = LOCAL_c_input_stream;
Int status;
Term out;
LOCK(GLOBAL_Stream[sno].streamlock);
status = GLOBAL_Stream[sno].status;
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if (!(status & Binary_Stream_f)
// &&strictISOFlag()
) {
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UNLOCK(GLOBAL_Stream[sno].streamlock);
Yap_Error(PERMISSION_ERROR_INPUT_TEXT_STREAM, ARG1, "get_byte/1");
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return (FALSE);
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}
out = MkIntTerm(GLOBAL_Stream[sno].stream_getc(sno));
UNLOCK(GLOBAL_Stream[sno].streamlock);
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return Yap_unify_constant(ARG1, out);
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}
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static Int put_code_1(USES_REGS1) { /* '$put'(,N) */
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int sno = LOCAL_c_output_stream, ch;
Term t2;
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if (IsVarTerm(t2 = Deref(ARG1))) {
Yap_Error(INSTANTIATION_ERROR, t2, "put_code/1");
return FALSE;
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} else if (!IsIntegerTerm(t2)) {
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Yap_Error(TYPE_ERROR_INTEGER, t2, "put_code/1");
return FALSE;
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} else if ((ch = IntegerOfTerm(t2)) < -1) {
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Yap_Error(DOMAIN_ERROR_OUT_OF_RANGE, t2, "put_code/1");
return FALSE;
}
LOCK(GLOBAL_Stream[sno].streamlock);
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GLOBAL_Stream[sno].stream_wputc(sno, (int)IntegerOfTerm(Deref(ARG2)));
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/*
* if (!(GLOBAL_Stream[sno].status & Null_Stream_f))
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* yap_fflush(GLOBAL_Stream[sno].file);
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*/
UNLOCK(GLOBAL_Stream[sno].streamlock);
return (TRUE);
}
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static Int put_code(USES_REGS1) { /* '$put'(Stream,N) */
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int ch;
Term t2;
int sno;
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if (IsVarTerm(t2 = Deref(ARG2))) {
Yap_Error(INSTANTIATION_ERROR, t2, "put_code/1");
return FALSE;
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} else if (!IsIntegerTerm(t2)) {
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Yap_Error(TYPE_ERROR_INTEGER, t2, "put_code/1");
return FALSE;
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} else if ((ch = IntegerOfTerm(t2)) < -1) {
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Yap_Error(DOMAIN_ERROR_OUT_OF_RANGE, t2, "put_code/1");
return FALSE;
}
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sno = Yap_CheckTextStream(ARG1, Output_Stream_f, "put/2");
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if (sno < 0)
return (FALSE);
if (GLOBAL_Stream[sno].status & Binary_Stream_f) {
UNLOCK(GLOBAL_Stream[sno].streamlock);
Yap_Error(PERMISSION_ERROR_OUTPUT_BINARY_STREAM, ARG1, "put/2");
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return (FALSE);
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}
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GLOBAL_Stream[sno].stream_wputc(sno, ch);
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/*
* if (!(GLOBAL_Stream[sno].status & Null_Stream_f))
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* yap_fflush(GLOBAL_Stream[sno].file);
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*/
UNLOCK(GLOBAL_Stream[sno].streamlock);
return (TRUE);
}
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static Int put_char_1(USES_REGS1) { /* '$put'(,N) */
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int sno = LOCAL_c_output_stream;
Term t2;
int ch;
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if (IsVarTerm(t2 = Deref(ARG1))) {
Yap_Error(INSTANTIATION_ERROR, t2, "put_char/1");
return FALSE;
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} else if (!IsAtomTerm(t2)) {
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Yap_Error(TYPE_ERROR_INTEGER, t2, "put_char/1");
return FALSE;
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} else if ((ch = CharOfAtom(AtomOfTerm(t2))) < -1) {
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Yap_Error(DOMAIN_ERROR_OUT_OF_RANGE, t2, "put_char/1");
return FALSE;
}
LOCK(GLOBAL_Stream[sno].streamlock);
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if (GLOBAL_Stream[sno].status & Binary_Stream_f) {
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UNLOCK(GLOBAL_Stream[sno].streamlock);
Yap_Error(PERMISSION_ERROR_OUTPUT_BINARY_STREAM, ARG1, "put/2");
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return (FALSE);
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}
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GLOBAL_Stream[sno].stream_wputc(sno, ch);
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/*
* if (!(GLOBAL_Stream[sno].status & Null_Stream_f))
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* yap_fflush(GLOBAL_Stream[sno].file);
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*/
UNLOCK(GLOBAL_Stream[sno].streamlock);
return (TRUE);
}
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static Int put_char(USES_REGS1) { /* '$put'(Stream,N) */
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Term t2;
int ch;
int sno;
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if (IsVarTerm(t2 = Deref(ARG2))) {
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Yap_Error(INSTANTIATION_ERROR, t2, "put_char/1");
return FALSE;
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} else if (!IsAtomTerm(t2)) {
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Yap_Error(TYPE_ERROR_INTEGER, t2, "put_char/1");
return FALSE;
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} else if ((ch = CharOfAtom(AtomOfTerm(t2))) < -1) {
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Yap_Error(DOMAIN_ERROR_OUT_OF_RANGE, t2, "put_char/1");
return FALSE;
}
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sno = Yap_CheckTextStream(ARG1, Output_Stream_f, "put/2");
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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");
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return (FALSE);
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}
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GLOBAL_Stream[sno].stream_wputc(sno, (int)IntegerOfTerm(Deref(ARG2)));
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/*
* if (!(GLOBAL_Stream[sno].status & Null_Stream_f))
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* yap_fflush(GLOBAL_Stream[sno].file);
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*/
UNLOCK(GLOBAL_Stream[sno].streamlock);
return (TRUE);
}
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static Int tab_1(USES_REGS1) { /* nl */
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int sno = LOCAL_c_output_stream;
Term t2;
Int tabs, i;
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if (IsVarTerm(t2 = Deref(ARG2))) {
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Yap_Error(INSTANTIATION_ERROR, t2, "put_char/1");
return FALSE;
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} else if (!IsIntegerTerm(t2)) {
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Yap_Error(TYPE_ERROR_INTEGER, t2, "put_char/1");
return FALSE;
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} else if ((tabs = IntegerOfTerm(t2)) < 0) {
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Yap_Error(DOMAIN_ERROR_OUT_OF_RANGE, t2, "tab/1");
return FALSE;
}
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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");
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return (FALSE);
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}
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for (i = 0; i < tabs; i++)
GLOBAL_Stream[sno].stream_wputc(sno, ' ');
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/*
* if (!(GLOBAL_Stream[sno].status & Null_Stream_f))
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* yap_fflush(GLOBAL_Stream[sno].file);
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*/
UNLOCK(GLOBAL_Stream[sno].streamlock);
return (TRUE);
}
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static Int tab(USES_REGS1) { /* nl(Stream) */
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int sno;
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Term t2;
Int tabs, i;
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if (IsVarTerm(t2 = Deref(ARG2))) {
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Yap_Error(INSTANTIATION_ERROR, t2, "put_char/1");
return FALSE;
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} else if (!IsIntegerTerm(t2)) {
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Yap_Error(TYPE_ERROR_INTEGER, t2, "put_char/1");
return FALSE;
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} else if ((tabs = IntegerOfTerm(t2)) < 0) {
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Yap_Error(DOMAIN_ERROR_OUT_OF_RANGE, t2, "tab/1");
return FALSE;
}
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sno = Yap_CheckTextStream(ARG1, Output_Stream_f, "nl/1");
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if (sno < 0)
return (FALSE);
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if (GLOBAL_Stream[sno].status & Binary_Stream_f) {
UNLOCK(GLOBAL_Stream[sno].streamlock);
Yap_Error(PERMISSION_ERROR_OUTPUT_BINARY_STREAM, ARG1, "nl/0");
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return (FALSE);
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}
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for (i = 0; i < tabs; i++)
GLOBAL_Stream[sno].stream_wputc(sno, ' ');
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/*
* if (!(GLOBAL_Stream[sno].status & Null_Stream_f))
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* yap_fflush(GLOBAL_Stream[sno].file);
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*/
UNLOCK(GLOBAL_Stream[sno].streamlock);
return (TRUE);
}
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static Int nl_1(USES_REGS1) { /* nl */
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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");
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return (FALSE);
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}
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GLOBAL_Stream[sno].stream_wputc(sno, 10);
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/*
* if (!(GLOBAL_Stream[sno].status & Null_Stream_f))
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* yap_fflush(GLOBAL_Stream[sno].file);
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*/
UNLOCK(GLOBAL_Stream[sno].streamlock);
return (TRUE);
}
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static Int nl(USES_REGS1) { /* nl(Stream) */
int sno = Yap_CheckTextStream(ARG1, Output_Stream_f, "nl/1");
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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");
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return (FALSE);
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}
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GLOBAL_Stream[sno].stream_wputc(sno, 10);
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/*
* if (!(GLOBAL_Stream[sno].status & Null_Stream_f))
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* yap_fflush(GLOBAL_Stream[sno].file);
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*/
UNLOCK(GLOBAL_Stream[sno].streamlock);
return (TRUE);
}
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static Int put_byte(USES_REGS1) { /* '$put_byte'(Stream,N) */
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Term t2;
Int ch;
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if (IsVarTerm(t2 = Deref(ARG2))) {
Yap_Error(INSTANTIATION_ERROR, t2, "put_code/2");
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return FALSE;
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} else if (!IsIntegerTerm(t2)) {
Yap_Error(TYPE_ERROR_BYTE, t2, "put_code/2");
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return FALSE;
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} else if ((ch = IntegerOfTerm(t2)) < -1) {
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Yap_Error(DOMAIN_ERROR_OUT_OF_RANGE, t2, "put_code/1");
return FALSE;
}
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int sno = Yap_CheckStream(ARG1, Output_Stream_f, "put/2");
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if (sno < 0)
return (FALSE);
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if (!(GLOBAL_Stream[sno].status & Binary_Stream_f)
// && strictISOFlag()
) {
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UNLOCK(GLOBAL_Stream[sno].streamlock);
Yap_Error(PERMISSION_ERROR_OUTPUT_TEXT_STREAM, ARG1, NULL);
return false;
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}
GLOBAL_Stream[sno].stream_putc(sno, ch);
/*
* if (!(GLOBAL_Stream[sno].status & Null_Stream_f))
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* yap_fflush(GLOBAL_Stream[sno].file);
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*/
UNLOCK(GLOBAL_Stream[sno].streamlock);
return (TRUE);
}
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static Int put_byte_1(USES_REGS1) { /* '$put_byte'(Stream,N) */
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Term t2;
Int ch;
int sno = LOCAL_c_output_stream;
if (IsVarTerm(t2 = Deref(ARG1))) {
Yap_Error(INSTANTIATION_ERROR, t2, "put_code/1");
return FALSE;
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} else if (!IsIntegerTerm(t2)) {
Yap_Error(TYPE_ERROR_BYTE, t2, "put_code/1");
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return FALSE;
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} else if ((ch = IntegerOfTerm(t2)) < -1) {
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Yap_Error(DOMAIN_ERROR_OUT_OF_RANGE, t2, "put_code/1");
return FALSE;
}
LOCK(GLOBAL_Stream[sno].streamlock);
if (!(GLOBAL_Stream[sno].status & Binary_Stream_f)
//&& strictISOFlag()
) {
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UNLOCK(GLOBAL_Stream[sno].streamlock);
Yap_Error(PERMISSION_ERROR_OUTPUT_TEXT_STREAM, ARG1, "get0/2");
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return (FALSE);
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}
GLOBAL_Stream[sno].stream_putc(sno, ch);
UNLOCK(GLOBAL_Stream[sno].streamlock);
return (TRUE);
}
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static Int skip_1(USES_REGS1) { /* '$skip'(Stream,N) */
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Int n;
Term t2;
int sno;
int ch;
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if (IsVarTerm(t2 = Deref(ARG2))) {
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Yap_Error(INSTANTIATION_ERROR, t2, "skip/2");
return FALSE;
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} else if (!IsIntegerTerm(t2)) {
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Yap_Error(TYPE_ERROR_INTEGER, t2, "skip/2");
return FALSE;
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} else if ((n = IntegerOfTerm(t2)) < 0) {
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Yap_Error(DOMAIN_ERROR_OUT_OF_RANGE, t2, "skip/2");
return FALSE;
}
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sno = Yap_CheckTextStream(ARG1, Input_Stream_f, "skip/2");
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if (sno < 0)
return (FALSE);
while ((ch = GLOBAL_Stream[sno].stream_wgetc(sno)) != n && ch != -1)
;
UNLOCK(GLOBAL_Stream[sno].streamlock);
return (TRUE);
}
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static Int skip(USES_REGS1) { /* '$skip'(Stream,N) */
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Int n;
Term t2;
int sno;
int ch;
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if (IsVarTerm(t2 = Deref(ARG2))) {
Yap_Error(INSTANTIATION_ERROR, t2, "skip/2");
return FALSE;
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} else if (!IsIntegerTerm(t2)) {
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Yap_Error(TYPE_ERROR_INTEGER, t2, "skip/2");
return FALSE;
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} else if ((n = IntegerOfTerm(t2)) < 0) {
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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);
}
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/**
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* @pred flush_output(+Stream)
*
* Flush the stream _Stream_, that is, make sure all pending output is committed
* before any further execution.
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*
* @param +_Stream_
*
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*/
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static Int flush_output(USES_REGS1) { /* flush_output(Stream) */
int sno = Yap_CheckStream(ARG1, Output_Stream_f, "flush_output/1");
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if (sno < 0)
return (FALSE);
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yap_fflush(sno);
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UNLOCK(GLOBAL_Stream[sno].streamlock);
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return (TRUE);
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}
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/**
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* @pred flush_output
*
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* Flush the current output stream, that is, make sure all pending output is
*committed
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* before any further execution. By default this is user_output, but it may be
* changed by current_output/1.
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*
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*/
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static Int flush_output0(USES_REGS1) { /* flush_output */
yap_fflush(LOCAL_c_output_stream);
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return (TRUE);
}
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static Int flush_all_streams(USES_REGS1) { /* $flush_all_streams */
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#if BROKEN_FFLUSH_NULL
int i;
for (i = 0; i < MaxStreams; ++i) {
LOCK(GLOBAL_Stream[i].streamlock);
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yap_fflush(i);
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UNLOCK(GLOBAL_Stream[i].streamlock);
}
#else
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fflush(NULL);
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#endif
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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
2015-07-28 04:22:44 +01:00
leaving the current stream position unaltered.
2015-06-18 00:59:10 +01:00
*/
/** @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
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leaving the current stream position unaltered.
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*/
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static Int peek_code(USES_REGS1) { /* at_end_of_stream */
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/* the next character is a EOF */
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int sno = Yap_CheckTextStream(ARG1, Input_Stream_f, "peek/2");
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Int ch;
if (sno < 0)
return FALSE;
if (GLOBAL_Stream[sno].status & Binary_Stream_f) {
UNLOCK(GLOBAL_Stream[sno].streamlock);
2015-10-11 04:23:16 +01:00
Yap_Error(PERMISSION_ERROR_INPUT_BINARY_STREAM, ARG1, "peek_code/2");
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return FALSE;
}
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if ((ch = Yap_peek(sno)) < 0) {
#ifdef PEEK_EOF
2015-06-19 10:10:02 +01:00
UNLOCK(GLOBAL_Stream[sno].streamlock);
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return false;
#endif
}
UNLOCK(GLOBAL_Stream[sno].streamlock);
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return (Yap_unify_constant(ARG2, MkIntTerm(ch)));
2015-06-18 00:59:10 +01:00
}
/** @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
2015-07-28 04:22:44 +01:00
leaving the current stream position unaltered.
2015-06-18 00:59:10 +01:00
*/
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static Int peek_code_1(USES_REGS1) { /* at_end_of_stream */
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/* the next character is a EOF */
2015-06-18 00:59:10 +01:00
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;
}
2015-10-18 11:48:14 +01:00
if ((ch = Yap_peek(sno)) < 0) {
#ifdef PEEK_EOF
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UNLOCK(GLOBAL_Stream[sno].streamlock);
2015-10-08 10:17:57 +01:00
return false;
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#endif
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}
UNLOCK(GLOBAL_Stream[sno].streamlock);
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return (Yap_unify_constant(ARG1, MkIntTerm(ch)));
2015-06-18 00:59:10 +01:00
}
/** @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.
*/
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static Int peek_byte(USES_REGS1) { /* at_end_of_stream */
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/* the next character is a EOF */
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int sno = Yap_CheckStream(ARG1, Input_Stream_f, "peek_byte/2");
Int ch;
2015-06-18 00:59:10 +01:00
if (sno < 0)
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return (FALSE);
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if (!(GLOBAL_Stream[sno].status & Binary_Stream_f)) {
UNLOCK(GLOBAL_Stream[sno].streamlock);
Yap_Error(PERMISSION_ERROR_INPUT_STREAM, ARG1, "peek_byte/2");
2015-10-18 11:48:14 +01:00
return (FALSE);
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}
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if ((ch = dopeek_byte(sno)) < 0) {
#ifdef PEEK_EOF
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UNLOCK(GLOBAL_Stream[sno].streamlock);
return false;
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#endif
}
UNLOCK(GLOBAL_Stream[sno].streamlock);
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return (Yap_unify_constant(ARG2, MkIntTerm(ch)));
2015-06-18 00:59:10 +01:00
}
/** @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.
*/
2015-10-18 11:48:14 +01:00
static Int peek_byte_1(USES_REGS1) { /* at_end_of_stream */
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/* the next character is a EOF */
2015-06-18 00:59:10 +01:00
int sno = LOCAL_c_input_stream;
Int ch;
if (sno < 0)
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return (FALSE);
2015-06-18 00:59:10 +01:00
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");
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return (FALSE);
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}
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if ((ch = dopeek_byte(sno)) < 0) {
#ifdef PEEK_EOF
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UNLOCK(GLOBAL_Stream[sno].streamlock);
return false;
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#endif
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}
UNLOCK(GLOBAL_Stream[sno].streamlock);
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return (Yap_unify_constant(ARG2, MkIntTerm(ch)));
2015-06-18 00:59:10 +01:00
}
/** @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.
*/
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static Int peek_char(USES_REGS1) {
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/* the next character is a EOF */
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int sno = Yap_CheckTextStream(ARG1, Input_Stream_f, "peek/2");
2015-06-18 00:59:10 +01:00
wchar_t wsinp[2];
Int ch;
if (sno < 0)
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return false;
2015-06-18 00:59:10 +01:00
if ((GLOBAL_Stream[sno].status & Binary_Stream_f)) {
UNLOCK(GLOBAL_Stream[sno].streamlock);
Yap_Error(PERMISSION_ERROR_INPUT_TEXT_STREAM, ARG1, "peek_byte/2");
2015-10-18 11:48:14 +01:00
return (FALSE);
2015-06-18 00:59:10 +01:00
}
2015-10-18 11:48:14 +01:00
if ((ch = Yap_peek(sno)) < 0) {
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UNLOCK(GLOBAL_Stream[sno].streamlock);
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return Yap_unify_constant(ARG2, MkAtomTerm(AtomEof));
2015-06-18 00:59:10 +01:00
}
UNLOCK(GLOBAL_Stream[sno].streamlock);
wsinp[1] = '\0';
wsinp[0] = ch;
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return Yap_unify_constant(ARG2, MkAtomTerm(Yap_LookupMaybeWideAtom(wsinp)));
2015-06-18 00:59:10 +01:00
}
/** @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.
*/
2015-10-18 11:48:14 +01:00
static Int peek_char_1(USES_REGS1) {
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/* the next character is a EOF */
2015-10-18 11:48:14 +01:00
int sno = LOCAL_c_input_stream;
2015-06-18 00:59:10 +01:00
wchar_t wsinp[2];
Int ch;
2015-07-28 04:22:44 +01:00
2015-06-18 00:59:10 +01:00
LOCK(GLOBAL_Stream[sno].streamlock);
2015-10-18 11:48:14 +01:00
if ((ch = Yap_peek(sno)) < 0) {
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UNLOCK(GLOBAL_Stream[sno].streamlock);
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return Yap_unify_constant(ARG2, MkAtomTerm(AtomEof));
// return false;
2015-06-18 00:59:10 +01:00
}
UNLOCK(GLOBAL_Stream[sno].streamlock);
wsinp[1] = '\0';
wsinp[0] = ch;
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return Yap_unify_constant(ARG2, MkAtomTerm(Yap_LookupMaybeWideAtom(wsinp)));
2015-06-18 00:59:10 +01:00
}
/** @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
2015-07-28 04:22:44 +01:00
leaving the current stream position unaltered.
2015-06-18 00:59:10 +01:00
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
2015-07-28 04:22:44 +01:00
leaving the current stream position unaltered.
2015-06-18 00:59:10 +01:00
*/
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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);
2015-06-18 00:59:10 +01:00
}