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yap-6.3/os/writeterm.c

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2015-06-18 01:40:15 +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: iopreds.c *
* Last rev: 5/2/88 *
* mods: *
* comments: Input/Output C implemented predicates *
* *
*************************************************************************/
#ifdef SCCS
static char SccsId[] = "%W% %G%";
#endif
/*
* This file includes the definition of a miscellania of standard predicates
* for yap refering to: Files and GLOBAL_Streams, Simple Input/Output,
*
*/
#include "Yap.h"
#include "Yatom.h"
#include "YapHeap.h"
#include "yapio.h"
#include "eval.h"
#include "YapText.h"
#include <stdlib.h>
#if HAVE_STDARG_H
#include <stdarg.h>
#endif
#if HAVE_CTYPE_H
#include <ctype.h>
#endif
#if HAVE_WCTYPE_H
#include <wctype.h>
#endif
#if HAVE_SYS_TIME_H
#include <sys/time.h>
#endif
#if HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#ifdef HAVE_SYS_STAT_H
#include <sys/stat.h>
#endif
#if HAVE_SYS_SELECT_H && !_MSC_VER && !defined(__MINGW32__)
#include <sys/select.h>
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#if HAVE_STRING_H
#include <string.h>
#endif
#if HAVE_SIGNAL_H
#include <signal.h>
#endif
#if HAVE_FCNTL_H
/* for O_BINARY and O_TEXT in WIN32 */
#include <fcntl.h>
#endif
#ifdef _WIN32
#if HAVE_IO_H
/* Windows */
#include <io.h>
#endif
#endif
#if !HAVE_STRNCAT
#define strncat(X,Y,Z) strcat(X,Y)
#endif
#if !HAVE_STRNCPY
#define strncpy(X,Y,Z) strcpy(X,Y)
#endif
#if _MSC_VER || defined(__MINGW32__)
#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"
#if _MSC_VER || defined(__MINGW32__)
#define SYSTEM_STAT _stat
#else
#define SYSTEM_STAT stat
#endif
#undef PAR
#define WRITE_DEFS() \
PAR( "module", isatom, WRITE_MODULE ), \
PAR( "attributes", isatom, WRITE_ATTRIBUTES ), \
PAR( "cycles", boolean, WRITE_CYCLES ), \
PAR( "quoted", boolean, WRITE_QUOTED ), \
PAR( "ignore_ops", boolean, WRITE_IGNORE_OPS ), \
PAR( "max_depth",nat, WRITE_MAX_DEPTH ), \
PAR( "numbervars", boolean, WRITE_NUMBERVARS ), \
PAR( "portrayed", boolean, WRITE_PORTRAYED ), \
PAR( "portray", boolean, WRITE_PORTRAY ), \
PAR( "priority", nat, WRITE_PRIORITY ), \
PAR( "character_escapes", boolean, WRITE_CHARACTER_ESCAPES ), \
PAR( "backquotes", boolean, WRITE_BACKQUOTES ), \
PAR( "brace_terms", boolean, WRITE_BRACE_TERMS ), \
PAR( "fullstop", boolean, WRITE_FULLSTOP ), \
PAR( "nl", boolean, WRITE_NL ), \
PAR( "variable_names",ok, WRITE_VARIABLE_NAMES ), \
PAR( NULL, ok, WRITE_END )
#define PAR(x,y,z) z
typedef enum open_enum_choices
{
WRITE_DEFS()
} open_choices_t;
#undef PAR
#define PAR(x,y,z) { x , y, z }
static const param_t write_defs[] =
{
WRITE_DEFS()
};
#undef PAR
#ifdef BEAM
int beam_write ( USES_REGS1 )
{
Yap_StartSlots();
Yap_plwrite (ARG1, GLOBAL_Stream+LOCAL_c_output_stream, 0, 0, 1200);
Yap_CloseSlots();
if (EX != 0L) {
Term ball = Yap_PopTermFromDB(EX);
EX = 0L;
Yap_JumpToEnv(ball);
return(FALSE);
}
return (TRUE);
}
#endif
static bool
bind_variable_names(Term t USES_REGS)
{
while(!IsVarTerm(t) && IsPairTerm(t)) {
Term tl = HeadOfTerm(t);
Functor f;
Term tv, t2, t1;
if (!IsApplTerm(tl)) return FALSE;
if ((f = FunctorOfTerm(tl)) != FunctorEq) {
return FALSE;
}
t1 = ArgOfTerm(1, tl);
if (IsVarTerm(t1)) {
Yap_Error(INSTANTIATION_ERROR, t1, "variable_names");
return false;
}
t2 = ArgOfTerm(2, tl);
tv = Yap_MkApplTerm(LOCAL_FunctorVar, 1, &t1);
if (IsVarTerm(t2)) {
Bind(VarOfTerm(t2), tv);
}
t = TailOfTerm(t);
}
return true;
}
static int
unbind_variable_names(Term t USES_REGS)
{
while(!IsVarTerm(t) && IsPairTerm(t)) {
Term tl = HeadOfTerm(t);
Functor f;
Term *tp2, t1;
if (!IsApplTerm(tl)) return FALSE;
if ((f = FunctorOfTerm(tl)) != FunctorEq) {
return FALSE;
}
t1 = ArgOfTerm(1, tl);
tp2 = RepAppl(tl)+2;
while (*tp2 != t1) {
tp2 = (CELL*)*tp2;
}
RESET_VARIABLE( tp2 );
t = TailOfTerm(t);
}
return TRUE;
}
static bool
write_term ( int output_stream, Term t, xarg *args USES_REGS )
{
bool rc;
Term cm = CurrentModule;
int depth, prio, flags =0;
if (args[WRITE_MODULE].used) {
CurrentModule = args[WRITE_MODULE].tvalue;
}
if (args[WRITE_VARIABLE_NAMES].used) {
bind_variable_names(args[WRITE_VARIABLE_NAMES].tvalue PASS_REGS);
flags |= Handle_vars_f;
}
if (args[WRITE_NUMBERVARS].used) {
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if (args[WRITE_NUMBERVARS].tvalue == TermTrue)
flags |= Handle_vars_f;
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}
if (args[WRITE_ATTRIBUTES].used) {
Term ctl = args[WRITE_ATTRIBUTES].tvalue;
if (ctl == TermWrite) {
flags |= AttVar_None_f;
} else if (ctl == TermPortray) {
flags |= AttVar_None_f|AttVar_Portray_f;
} else if (ctl == TermDots) {
flags |= AttVar_Dots_f;
} else if (ctl != TermIgnore) {
Yap_Error(DOMAIN_ERROR_OUT_OF_RANGE, ctl, "write attributes should be one of {dots,ignore,portray,write}");
rc = false;
goto end;
}
}
if (args[WRITE_CYCLES].used &&
args[WRITE_CYCLES].tvalue == TermFalse) {
flags |= Unfold_cyclics_f;
}
if (args[WRITE_QUOTED].used &&
args[WRITE_QUOTED].tvalue == TermTrue) {
flags |= Quote_illegal_f;
}
if (args[WRITE_IGNORE_OPS].used &&
args[WRITE_IGNORE_OPS].tvalue == TermTrue) {
flags |= Ignore_ops_f;
}
if (args[WRITE_PORTRAY].used &&
args[WRITE_IGNORE_OPS].tvalue == TermTrue) {
flags |= Ignore_ops_f;
}
if (args[WRITE_PORTRAYED].used &&
args[WRITE_PORTRAYED].tvalue == TermTrue) {
flags |= Use_portray_f;
}
if (args[WRITE_CHARACTER_ESCAPES].used &&
args[WRITE_CHARACTER_ESCAPES].tvalue == TermFalse) {
flags |= No_Escapes_f;
}
if (args[WRITE_BACKQUOTES].used &&
args[WRITE_BACKQUOTES].tvalue == TermTrue) {
flags |= BackQuote_String_f;
}
if (args[WRITE_BRACE_TERMS].used &&
args[WRITE_BRACE_TERMS].tvalue == TermFalse) {
flags |= No_Brace_Terms_f;
}
if (args[WRITE_FULLSTOP].used &&
args[WRITE_FULLSTOP].tvalue == TermTrue) {
flags |= Fullstop_f;
}
if (args[WRITE_NL].used &&
args[WRITE_NL].tvalue == TermTrue) {
flags |= New_Line_f;
}
if (args[WRITE_MAX_DEPTH].used) {
depth = IntegerOfTerm(args[WRITE_MAX_DEPTH].tvalue);
} else
depth = LOCAL_max_depth;
if (args[WRITE_PRIORITY].used) {
prio = IntegerOfTerm(args[WRITE_PRIORITY].tvalue);
} else {
prio = 1200;
}
Yap_plwrite( t, GLOBAL_Stream+output_stream, depth, flags, prio);
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UNLOCK(GLOBAL_Stream[output_stream].streamlock);
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rc = true;
end:
if (args[WRITE_VARIABLE_NAMES].used) {
unbind_variable_names(args[WRITE_VARIABLE_NAMES].tvalue PASS_REGS);
}
CurrentModule = cm;
return rc;
}
static Int
write_term2 ( USES_REGS1 )
{
/* '$write'(+Flags,?Term) */
/* notice: we must have ASP well set when using portray, otherwise
we cannot make recursive Prolog calls */
xarg * args = Yap_ArgListToVector ( ARG2, write_defs, WRITE_END );
if (args == NULL) {
if (LOCAL_Error_TYPE == DOMAIN_ERROR_OUT_OF_RANGE)
LOCAL_Error_TYPE = DOMAIN_ERROR_WRITE_OPTION;
if (LOCAL_Error_TYPE)
Yap_Error(LOCAL_Error_TYPE, LOCAL_Error_Term, NULL);
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return false;
}
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yhandle_t mySlots = Yap_StartSlots();
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int output_stream = LOCAL_c_output_stream;
if (output_stream == -1) output_stream = 1;
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LOCK(GLOBAL_Stream[output_stream].streamlock);
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write_term( output_stream, ARG2, args PASS_REGS);
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UNLOCK(GLOBAL_Stream[output_stream].streamlock);
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Yap_CloseSlots( mySlots );
if (EX != 0L) {
Term ball = Yap_PopTermFromDB(EX);
EX = NULL;
Yap_JumpToEnv(ball);
return(FALSE);
}
return (TRUE);
}
static Int
write_term3 ( USES_REGS1 )
{
/* notice: we must have ASP well set when using portray, otherwise
we cannot make recursive Prolog calls */
xarg *args = Yap_ArgListToVector ( ARG3, write_defs, WRITE_END );
if (args == NULL) {
if (LOCAL_Error_TYPE == DOMAIN_ERROR_OUT_OF_RANGE)
LOCAL_Error_TYPE = DOMAIN_ERROR_WRITE_OPTION;
if (LOCAL_Error_TYPE)
Yap_Error(LOCAL_Error_TYPE, LOCAL_Error_Term, NULL);
return false;
}
int output_stream = Yap_CheckTextStream (ARG1, Output_Stream_f, "write/2");
if (output_stream < 0 )
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return false;
yhandle_t mySlots = Yap_StartSlots();
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write_term( output_stream, ARG2, args PASS_REGS);
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UNLOCK(GLOBAL_Stream[output_stream].streamlock);
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Yap_CloseSlots( mySlots );
if (EX != 0L) {
Term ball = Yap_PopTermFromDB(EX);
EX = NULL;
Yap_JumpToEnv(ball);
return(FALSE);
}
return (TRUE);
}
static Int
write2 ( USES_REGS1 )
{
/* notice: we must have ASP well set when using portray, otherwise
we cannot make recursive Prolog calls */
xarg *args;
yhandle_t mySlots;
int output_stream = Yap_CheckTextStream (ARG1, Output_Stream_f, "write/2");
if (output_stream < 0 )
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return false;
args = Yap_ArgListToVector ( TermNil, write_defs, WRITE_END );
if (args == NULL) {
if (LOCAL_Error_TYPE == DOMAIN_ERROR_OUT_OF_RANGE)
LOCAL_Error_TYPE = DOMAIN_ERROR_WRITE_OPTION;
if (LOCAL_Error_TYPE)
Yap_Error(LOCAL_Error_TYPE, LOCAL_Error_Term, NULL);
return false;
}
mySlots = Yap_StartSlots();
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args[WRITE_NUMBERVARS].used = true;
args[WRITE_NUMBERVARS].tvalue = TermTrue;
write_term( output_stream, ARG2, args PASS_REGS);
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UNLOCK(GLOBAL_Stream[output_stream].streamlock);
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Yap_CloseSlots( mySlots );
if (EX != 0L) {
Term ball = Yap_PopTermFromDB(EX);
EX = NULL;
Yap_JumpToEnv(ball);
return(FALSE);
}
return (TRUE);
}
static Int
write1 ( USES_REGS1 )
{
/* notice: we must have ASP well set when using portray, otherwise
we cannot make recursive Prolog calls */
int output_stream = LOCAL_c_output_stream;
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if (output_stream == -1) output_stream = 1;
xarg * args = Yap_ArgListToVector ( TermNil, write_defs, WRITE_END );
if (args == NULL) {
if (LOCAL_Error_TYPE)
Yap_Error(LOCAL_Error_TYPE, LOCAL_Error_Term, NULL);
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return false;
}
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yhandle_t mySlots = Yap_StartSlots();
args[WRITE_NUMBERVARS].used = true;
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args[WRITE_NUMBERVARS].tvalue = TermTrue;
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LOCK(GLOBAL_Stream[output_stream].streamlock);
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write_term( output_stream, ARG1, args PASS_REGS);
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UNLOCK(GLOBAL_Stream[output_stream].streamlock);
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Yap_CloseSlots( mySlots );
if (EX != 0L) {
Term ball = Yap_PopTermFromDB(EX);
EX = NULL;
Yap_JumpToEnv(ball);
return(FALSE);
}
return (TRUE);
}
static Int
write_canonical1 ( USES_REGS1 )
{
/* notice: we must have ASP well set when using portray, otherwise
we cannot make recursive Prolog calls */
int output_stream = LOCAL_c_output_stream;
if (output_stream == -1) output_stream = 1;
xarg * args = Yap_ArgListToVector ( TermNil, write_defs, WRITE_END );
if (args == NULL) {
if (LOCAL_Error_TYPE)
Yap_Error(LOCAL_Error_TYPE, LOCAL_Error_Term, NULL);
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return false;
}
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yhandle_t mySlots = Yap_StartSlots();
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args[WRITE_IGNORE_OPS].used = true;
args[WRITE_IGNORE_OPS].tvalue = TermTrue;
args[WRITE_QUOTED].used = true;
args[WRITE_QUOTED].tvalue = TermTrue;
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LOCK(GLOBAL_Stream[output_stream].streamlock);
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write_term( output_stream, ARG1, args PASS_REGS);
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UNLOCK(GLOBAL_Stream[output_stream].streamlock);
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Yap_CloseSlots( mySlots );
if (EX != 0L) {
Term ball = Yap_PopTermFromDB(EX);
EX = NULL;
Yap_JumpToEnv(ball);
return(FALSE);
}
return (TRUE);
}
static Int
write_canonical ( USES_REGS1 )
{
/* notice: we must have ASP well set when using portray, otherwise
we cannot make recursive Prolog calls */
xarg * args = Yap_ArgListToVector ( TermNil, write_defs, WRITE_END );
if (args == NULL) {
if (LOCAL_Error_TYPE)
Yap_Error(LOCAL_Error_TYPE, LOCAL_Error_Term, NULL);
return false;
}
int output_stream = Yap_CheckTextStream (ARG1, Output_Stream_f, "write/2");
if (output_stream < 0 )
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return false;
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yhandle_t mySlots = Yap_StartSlots();
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args[WRITE_IGNORE_OPS].used = true;
args[WRITE_IGNORE_OPS].tvalue = TermTrue;
args[WRITE_QUOTED].used = true;
args[WRITE_QUOTED].tvalue = TermTrue;
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write_term( output_stream, ARG2, args PASS_REGS);
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UNLOCK(GLOBAL_Stream[output_stream].streamlock);
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Yap_CloseSlots( mySlots );
if (EX != 0L) {
Term ball = Yap_PopTermFromDB(EX);
EX = NULL;
Yap_JumpToEnv(ball);
return(FALSE);
}
return (TRUE);
}
static Int
writeq1 ( USES_REGS1 )
{
/* notice: we must have ASP well set when using portray, otherwise
we cannot make recursive Prolog calls */
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xarg *args = Yap_ArgListToVector ( TermNil, write_defs, WRITE_END );
if (args == NULL) {
if (LOCAL_Error_TYPE)
Yap_Error(LOCAL_Error_TYPE, LOCAL_Error_Term, NULL);
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return false;
}
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yhandle_t mySlots = Yap_StartSlots();
int output_stream = LOCAL_c_output_stream;
if (output_stream == -1) output_stream = 1;
args[WRITE_NUMBERVARS].used = true;
args[WRITE_NUMBERVARS].tvalue = TermTrue;
args[WRITE_QUOTED].used = true;
args[WRITE_QUOTED].tvalue = TermTrue;
write_term( output_stream, ARG1, args PASS_REGS);
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UNLOCK(GLOBAL_Stream[output_stream].streamlock);
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Yap_CloseSlots( mySlots );
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if (EX != 0L) {
Term ball = Yap_PopTermFromDB(EX);
EX = NULL;
Yap_JumpToEnv(ball);
return(FALSE);
}
return (TRUE);
}
static Int
writeq ( USES_REGS1 )
{
/* notice: we must have ASP well set when using portray, otherwise
we cannot make recursive Prolog calls */
xarg *args = Yap_ArgListToVector ( TermNil, write_defs, WRITE_END );
if (args == NULL) {
if (LOCAL_Error_TYPE)
Yap_Error(LOCAL_Error_TYPE, LOCAL_Error_Term, NULL);
return false;
}
int output_stream = Yap_CheckTextStream (ARG1, Output_Stream_f, "write/2");
if (output_stream < 0 )
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return false;
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yhandle_t mySlots = Yap_StartSlots();
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args[WRITE_NUMBERVARS].used = true;
args[WRITE_NUMBERVARS].tvalue = TermTrue;
args[WRITE_QUOTED].used = true;
args[WRITE_QUOTED].tvalue = TermTrue;
write_term( output_stream, ARG2, args PASS_REGS);
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UNLOCK(GLOBAL_Stream[output_stream].streamlock);
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Yap_CloseSlots( mySlots );
if (EX != 0L) {
Term ball = Yap_PopTermFromDB(EX);
EX = NULL;
Yap_JumpToEnv(ball);
return(FALSE);
}
return (TRUE);
}
static Int
print1 ( USES_REGS1 )
{
/* notice: we must have ASP well set when using portray, otherwise
we cannot make recursive Prolog calls */
xarg *args = Yap_ArgListToVector ( TermNil, write_defs, WRITE_END );
if (args == NULL) {
if (LOCAL_Error_TYPE)
Yap_Error(LOCAL_Error_TYPE, LOCAL_Error_Term, NULL);
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return false;
}
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yhandle_t mySlots = Yap_StartSlots();
int output_stream = LOCAL_c_output_stream;
if (output_stream == -1) output_stream = 1;
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args[WRITE_PORTRAY].used = true;
args[WRITE_PORTRAY].tvalue = TermTrue;
args[WRITE_NUMBERVARS].used = true;
args[WRITE_NUMBERVARS].tvalue = TermTrue;
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LOCK(GLOBAL_Stream[output_stream].streamlock);
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write_term( output_stream, ARG1, args PASS_REGS);
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UNLOCK(GLOBAL_Stream[output_stream].streamlock);
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Yap_CloseSlots( mySlots );
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if (EX != 0L) {
Term ball = Yap_PopTermFromDB(EX);
EX = NULL;
Yap_JumpToEnv(ball);
return(FALSE);
}
return (TRUE);
}
static Int
print ( USES_REGS1 )
{
/* notice: we must have ASP well set when using portray, otherwise
we cannot make recursive Prolog calls */
xarg *args = Yap_ArgListToVector ( TermNil, write_defs, WRITE_END );
if (args == NULL) {
if (LOCAL_Error_TYPE)
Yap_Error(LOCAL_Error_TYPE, LOCAL_Error_Term, NULL);
return false;
}
int output_stream = Yap_CheckTextStream (ARG1, Output_Stream_f, "write/2");
if (output_stream < 0 )
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return false;
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yhandle_t mySlots = Yap_StartSlots();
args[WRITE_PORTRAY].used = true;
args[WRITE_PORTRAY].tvalue = TermTrue;
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args[WRITE_NUMBERVARS].used = true;
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args[WRITE_NUMBERVARS].tvalue = TermTrue;
write_term( output_stream, ARG2, args PASS_REGS);
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UNLOCK(GLOBAL_Stream[output_stream].streamlock);
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Yap_CloseSlots( mySlots );
if (EX != 0L) {
Term ball = Yap_PopTermFromDB(EX);
EX = NULL;
Yap_JumpToEnv(ball);
return(FALSE);
}
return (TRUE);
}
static Int
writeln1 ( USES_REGS1 )
{
/* notice: we must have ASP well set when using portray, otherwise
we cannot make recursive Prolog calls */
int output_stream = LOCAL_c_output_stream;
if (output_stream == -1) output_stream = 1;
xarg *args = Yap_ArgListToVector ( TermNil, write_defs, WRITE_END );
if (args == NULL) {
if (LOCAL_Error_TYPE)
Yap_Error(LOCAL_Error_TYPE, LOCAL_Error_Term, NULL);
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return false;
}
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yhandle_t mySlots = Yap_StartSlots();
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args[WRITE_NL].used = true;
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args[WRITE_NL].tvalue = TermTrue;
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args[WRITE_NUMBERVARS].used = true;
args[WRITE_NUMBERVARS].tvalue = TermTrue;
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LOCK(GLOBAL_Stream[output_stream].streamlock);
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write_term( output_stream, ARG1, args PASS_REGS);
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UNLOCK(GLOBAL_Stream[output_stream].streamlock);
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Yap_CloseSlots( mySlots );
if (EX != 0L) {
Term ball = Yap_PopTermFromDB(EX);
EX = NULL;
Yap_JumpToEnv(ball);
return(FALSE);
}
return (TRUE);
}
static Int
writeln ( USES_REGS1 )
{
/* notice: we must have ASP well set when using portray, otherwise
we cannot make recursive Prolog calls */
xarg *args = Yap_ArgListToVector ( TermNil, write_defs, WRITE_END );
if (args == NULL) {
if (LOCAL_Error_TYPE)
Yap_Error(LOCAL_Error_TYPE, LOCAL_Error_Term, NULL);
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return false;
}
int output_stream = Yap_CheckTextStream (ARG1, Output_Stream_f, "writeln/2");
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if (output_stream < 0)
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return false;
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yhandle_t mySlots = Yap_StartSlots();
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args[WRITE_NL].used = true;
args[WRITE_NL].tvalue = TermTrue;
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args[WRITE_NUMBERVARS].used = true;
args[WRITE_NUMBERVARS].tvalue = TermTrue;
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write_term( output_stream, ARG1, args PASS_REGS);
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UNLOCK(GLOBAL_Stream[output_stream].streamlock);
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Yap_CloseSlots( mySlots );
if (EX != 0L) {
Term ball = Yap_PopTermFromDB(EX);
EX = NULL;
Yap_JumpToEnv(ball);
return(FALSE);
}
return (TRUE);
}
static Int
p_write_depth ( USES_REGS1 )
{ /* write_depth(Old,New) */
Term t1 = Deref (ARG1);
Term t2 = Deref (ARG2);
Term t3 = Deref (ARG3);
if (!IsVarTerm (t1) && !IsIntegerTerm (t1)) {
Yap_Error(TYPE_ERROR_INTEGER,t1,"write_depth/3");
return FALSE;
}
if (!IsVarTerm (t2) && !IsIntegerTerm (t2)) {
Yap_Error(TYPE_ERROR_INTEGER,t2,"write_depth/3");
return FALSE;
}
if (!IsVarTerm (t3) && !IsIntegerTerm (t3)) {
Yap_Error(TYPE_ERROR_INTEGER,t3,"write_depth/3");
return FALSE;
}
if (IsVarTerm (t1))
{
Term t = MkIntegerTerm (LOCAL_max_depth);
if (!Yap_unify_constant(t1, t))
return FALSE;
}
else
LOCAL_max_depth = IntegerOfTerm (t1);
if (IsVarTerm (t2))
{
Term t = MkIntegerTerm (LOCAL_max_list);
if (!Yap_unify_constant (t2, t))
return FALSE;
}
else
LOCAL_max_list = IntegerOfTerm (t2);
if (IsVarTerm (t3))
{
Term t = MkIntegerTerm (LOCAL_max_write_args);
if (!Yap_unify_constant (t3, t))
return FALSE;
}
else
LOCAL_max_write_args = IntegerOfTerm (t3);
return TRUE;
}
static Int
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dollar_var( USES_REGS1 )
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{
Term in = Deref(ARG1);
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if (IsVarTerm(in)) {
Term t2;
if (!IsVarTerm(t2=Deref(ARG2))) {
if (IsApplTerm(t2) &&
FunctorOfTerm( t2 ) == LOCAL_FunctorVar ) {
return Yap_unify(ArgOfTerm(1, t2), ARG1);
}
Yap_Error( TYPE_ERROR_COMPOUND, ARG2 , "");
return false;
} else {
Yap_Error( INSTANTIATION_ERROR, ARG2 , "");
}
}
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Term t2 = Yap_unify( MkVarTerm(), ARG1);
Term tv = Yap_MkApplTerm(LOCAL_FunctorVar, 1, &t2);
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return Yap_unify(tv, ARG2);
}
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void
Yap_InitWriteTPreds(void)
{
Yap_InitCPred ("write_term", 2, write_term2, SyncPredFlag);
Yap_InitCPred ("write_term", 3, write_term3, SyncPredFlag);
Yap_InitCPred ("write", 1, write1, SyncPredFlag);
Yap_InitCPred ("write", 2, write2, SyncPredFlag);
Yap_InitCPred ("writeq", 1, writeq1, SyncPredFlag);
Yap_InitCPred ("writeq", 2, writeq, SyncPredFlag);
Yap_InitCPred ("writeln", 1, writeln1, SyncPredFlag);
Yap_InitCPred ("writeln", 2, writeln, SyncPredFlag);
Yap_InitCPred ("write_canonical", 1,write_canonical1, SyncPredFlag);
Yap_InitCPred ("write_canonical", 2, write_canonical, SyncPredFlag);
Yap_InitCPred ("print", 1, print1, SyncPredFlag);
Yap_InitCPred ("print", 2, print, SyncPredFlag);
Yap_InitCPred ("write_depth", 3, p_write_depth, SafePredFlag|SyncPredFlag);
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;
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Yap_InitCPred ("$VAR", 2, dollar_var, SafePredFlag);
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;
}