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yap-6.3/os/writeterm.c
2016-12-04 12:52:42 -06:00

747 lines
22 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: 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 "YapHeap.h"
#include "YapText.h"
#include "Yatom.h"
#include "eval.h"
#include "yapio.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"
static Term readFromBuffer(const char *s, Term opts) {
Term rval;
int sno;
encoding_t enc = ENC_ISO_UTF8;
sno = Yap_open_buf_read_stream((char *)s, strlen_utf8((unsigned char *)s),
&enc, MEM_BUF_USER);
rval = Yap_read_term(sno, opts, 3);
Yap_CloseStream(sno);
return rval;
}
#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", booleanFlag, WRITE_CYCLES), \
PAR("quoted", booleanFlag, WRITE_QUOTED), \
PAR("ignore_ops", booleanFlag, WRITE_IGNORE_OPS), \
PAR("max_depth", nat, WRITE_MAX_DEPTH), \
PAR("numbervars", booleanFlag, WRITE_NUMBERVARS), \
PAR("portrayed", booleanFlag, WRITE_PORTRAYED), \
PAR("portray", booleanFlag, WRITE_PORTRAY), \
PAR("priority", nat, WRITE_PRIORITY), \
PAR("character_escapes", booleanFlag, WRITE_CHARACTER_ESCAPES), \
PAR("backquotes", booleanFlag, WRITE_BACKQUOTES), \
PAR("brace_terms", booleanFlag, WRITE_BRACE_TERMS), \
PAR("fullstop", booleanFlag, WRITE_FULLSTOP), \
PAR("nl", booleanFlag, 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,
GLOBAL_MaxPriority);
Yap_CloseSlots();
Yap_RaiseException();
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(FunctorDollarVar, 1, &t1);
if (IsVarTerm(t2)) {
YapBind(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) {
if (args[WRITE_NUMBERVARS].tvalue == TermTrue)
flags |= Handle_vars_f;
}
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_WRITE_OPTION, 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 = GLOBAL_MaxPriority;
}
Yap_plwrite(t, GLOBAL_Stream + output_stream, depth, flags, prio);
UNLOCK(GLOBAL_Stream[output_stream].streamlock);
rc = true;
end:
if (args[WRITE_VARIABLE_NAMES].used) {
unbind_variable_names(args[WRITE_VARIABLE_NAMES].tvalue PASS_REGS);
}
CurrentModule = cm;
return rc;
}
/**
*
*/
bool Yap_WriteTerm(int output_stream, Term t, Term opts USES_REGS) {
xarg *args = Yap_ArgListToVector(opts, 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, opts, NULL);
return false;
}
yhandle_t mySlots = Yap_StartSlots();
LOCK(GLOBAL_Stream[output_stream].streamlock);
write_term(output_stream, t, args PASS_REGS);
UNLOCK(GLOBAL_Stream[output_stream].streamlock);
free(args);
Yap_CloseSlots(mySlots);
Yap_RaiseException();
return (TRUE);
}
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 */
return Yap_WriteTerm(LOCAL_c_output_stream, ARG1, ARG2 PASS_REGS);
}
static Int write_term3(USES_REGS1) {
int output_stream = Yap_CheckTextStream(ARG1, Output_Stream_f, "write/2");
if (output_stream < 0) {
return false;
}
return Yap_WriteTerm(output_stream, ARG2, ARG3 PASS_REGS);
}
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)
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, TermNil, NULL);
return false;
}
mySlots = Yap_StartSlots();
args[WRITE_NUMBERVARS].used = true;
args[WRITE_NUMBERVARS].tvalue = TermTrue;
write_term(output_stream, ARG2, args PASS_REGS);
UNLOCK(GLOBAL_Stream[output_stream].streamlock);
free(args);
Yap_CloseSlots(mySlots);
Yap_RaiseException();
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;
if (output_stream == -1)
output_stream = 1;
xarg *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, TermNil, NULL);
return false;
}
yhandle_t mySlots = Yap_StartSlots();
args[WRITE_NUMBERVARS].used = true;
args[WRITE_NUMBERVARS].tvalue = TermTrue;
LOCK(GLOBAL_Stream[output_stream].streamlock);
write_term(output_stream, ARG1, args PASS_REGS);
UNLOCK(GLOBAL_Stream[output_stream].streamlock);
free(args);
Yap_CloseSlots(mySlots);
Yap_RaiseException();
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 == DOMAIN_ERROR_OUT_OF_RANGE)
LOCAL_Error_TYPE = DOMAIN_ERROR_WRITE_OPTION;
if (LOCAL_Error_TYPE)
Yap_Error(LOCAL_Error_TYPE, TermNil, NULL);
return false;
}
yhandle_t mySlots = Yap_StartSlots();
args[WRITE_IGNORE_OPS].used = true;
args[WRITE_IGNORE_OPS].tvalue = TermTrue;
args[WRITE_QUOTED].used = true;
args[WRITE_QUOTED].tvalue = TermTrue;
LOCK(GLOBAL_Stream[output_stream].streamlock);
write_term(output_stream, ARG1, args PASS_REGS);
UNLOCK(GLOBAL_Stream[output_stream].streamlock);
free(args);
Yap_CloseSlots(mySlots);
Yap_RaiseException();
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 == DOMAIN_ERROR_OUT_OF_RANGE)
LOCAL_Error_TYPE = DOMAIN_ERROR_WRITE_OPTION;
if (LOCAL_Error_TYPE)
Yap_Error(LOCAL_Error_TYPE, TermNil, NULL);
return false;
}
int output_stream = Yap_CheckTextStream(ARG1, Output_Stream_f, "write/2");
if (output_stream < 0) {
free(args);
return false;
}
yhandle_t mySlots = Yap_StartSlots();
args[WRITE_IGNORE_OPS].used = true;
args[WRITE_IGNORE_OPS].tvalue = TermTrue;
args[WRITE_QUOTED].used = true;
args[WRITE_QUOTED].tvalue = TermTrue;
write_term(output_stream, ARG2, args PASS_REGS);
UNLOCK(GLOBAL_Stream[output_stream].streamlock);
free(args);
Yap_CloseSlots(mySlots);
Yap_RaiseException();
return (TRUE);
}
static Int writeq1(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 == DOMAIN_ERROR_OUT_OF_RANGE)
LOCAL_Error_TYPE = DOMAIN_ERROR_WRITE_OPTION;
if (LOCAL_Error_TYPE)
Yap_Error(LOCAL_Error_TYPE, TermNil, NULL);
return false;
}
yhandle_t mySlots = Yap_StartSlots();
int output_stream = LOCAL_c_output_stream;
if (output_stream == -1) {
free(args);
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);
UNLOCK(GLOBAL_Stream[output_stream].streamlock);
free(args);
Yap_CloseSlots(mySlots);
Yap_RaiseException();
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 == DOMAIN_ERROR_OUT_OF_RANGE)
LOCAL_Error_TYPE = DOMAIN_ERROR_WRITE_OPTION;
if (LOCAL_Error_TYPE)
Yap_Error(LOCAL_Error_TYPE, TermNil, NULL);
return false;
}
int output_stream = Yap_CheckTextStream(ARG1, Output_Stream_f, "write/2");
if (output_stream < 0) {
free(args);
return false;
}
yhandle_t mySlots = Yap_StartSlots();
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);
UNLOCK(GLOBAL_Stream[output_stream].streamlock);
free(args);
Yap_CloseSlots(mySlots);
Yap_RaiseException();
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 == DOMAIN_ERROR_OUT_OF_RANGE)
LOCAL_Error_TYPE = DOMAIN_ERROR_WRITE_OPTION;
if (LOCAL_Error_TYPE)
Yap_Error(LOCAL_Error_TYPE, TermNil, NULL);
return false;
}
yhandle_t mySlots = Yap_StartSlots();
int output_stream = LOCAL_c_output_stream;
if (output_stream == -1) {
free(args);
output_stream = 1;
}
args[WRITE_PORTRAY].used = true;
args[WRITE_PORTRAY].tvalue = TermTrue;
args[WRITE_NUMBERVARS].used = true;
args[WRITE_NUMBERVARS].tvalue = TermTrue;
LOCK(GLOBAL_Stream[output_stream].streamlock);
write_term(output_stream, ARG1, args PASS_REGS);
UNLOCK(GLOBAL_Stream[output_stream].streamlock);
free(args);
Yap_CloseSlots(mySlots);
Yap_RaiseException();
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 == DOMAIN_ERROR_OUT_OF_RANGE)
LOCAL_Error_TYPE = DOMAIN_ERROR_WRITE_OPTION;
if (LOCAL_Error_TYPE)
Yap_Error(LOCAL_Error_TYPE, TermNil, NULL);
return false;
}
int output_stream = Yap_CheckTextStream(ARG1, Output_Stream_f, "write/2");
if (output_stream < 0) {
free(args);
return false;
}
yhandle_t mySlots = Yap_StartSlots();
args[WRITE_PORTRAY].used = true;
args[WRITE_PORTRAY].tvalue = TermTrue;
args[WRITE_NUMBERVARS].used = true;
args[WRITE_NUMBERVARS].tvalue = TermTrue;
write_term(output_stream, ARG2, args PASS_REGS);
UNLOCK(GLOBAL_Stream[output_stream].streamlock);
free(args);
Yap_CloseSlots(mySlots);
Yap_RaiseException();
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, TermNil, NULL);
return false;
}
yhandle_t mySlots = Yap_StartSlots();
args[WRITE_NL].used = true;
args[WRITE_NL].tvalue = TermTrue;
args[WRITE_NUMBERVARS].used = true;
args[WRITE_NUMBERVARS].tvalue = TermTrue;
LOCK(GLOBAL_Stream[output_stream].streamlock);
write_term(output_stream, ARG1, args PASS_REGS);
UNLOCK(GLOBAL_Stream[output_stream].streamlock);
free(args);
Yap_CloseSlots(mySlots);
Yap_RaiseException();
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, TermNil, NULL);
return false;
}
int output_stream = Yap_CheckTextStream(ARG1, Output_Stream_f, "writeln/2");
if (output_stream < 0) {
free(args);
return false;
}
yhandle_t mySlots = Yap_StartSlots();
args[WRITE_NL].used = true;
args[WRITE_NL].tvalue = TermTrue;
args[WRITE_NUMBERVARS].used = true;
args[WRITE_NUMBERVARS].tvalue = TermTrue;
write_term(output_stream, ARG2, args PASS_REGS);
UNLOCK(GLOBAL_Stream[output_stream].streamlock);
free(args);
Yap_CloseSlots(mySlots);
Yap_RaiseException();
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 dollar_var(USES_REGS1) {
Term in = Deref(ARG1);
if (IsVarTerm(in)) {
Term t2;
if (!IsVarTerm(t2 = Deref(ARG2))) {
if (IsApplTerm(t2) && FunctorOfTerm(t2) == FunctorDollarVar) {
return Yap_unify(ArgOfTerm(1, t2), ARG1);
}
Yap_Error(TYPE_ERROR_COMPOUND, ARG2, "");
return false;
} else {
Yap_Error(INSTANTIATION_ERROR, ARG2, "");
}
}
Term t2 = Yap_unify(MkVarTerm(), ARG1);
Term tv = Yap_MkApplTerm(FunctorDollarVar, 1, &t2);
return Yap_unify(tv, ARG2);
}
static Int term_to_string(USES_REGS1) {
Term t2 = Deref(ARG2), rc = false, t1 = Deref(ARG1);
const char *s;
if (IsVarTerm(t2)) {
size_t length;
s = Yap_TermToString(ARG1, &length, LOCAL_encoding,
Quote_illegal_f | Handle_vars_f);
if (!s || !MkStringTerm(s)) {
Yap_Error(RESOURCE_ERROR_HEAP, t1,
"Could not get memory from the operating system");
return false;
}
return Yap_unify(ARG2, MkStringTerm(s));
} else if (!IsStringTerm(t2)) {
Yap_Error(TYPE_ERROR_STRING, t2, "string_to_ter®m/2");
return false;
} else {
s = StringOfTerm(t2);
}
return (rc = readFromBuffer(s, TermNil)) != 0L && Yap_unify(rc, ARG1);
}
static Int term_to_atom(USES_REGS1) {
Term t2 = Deref(ARG2), ctl, rc = false;
Atom at;
if (IsVarTerm(t2)) {
size_t length;
const char *s = Yap_TermToString(Deref(ARG1), &length, LOCAL_encoding,
Quote_illegal_f | Handle_vars_f);
if (!s || !(at = Yap_UTF8ToAtom((const unsigned char *)s))) {
Yap_Error(RESOURCE_ERROR_HEAP, t2,
"Could not get memory from the operating system");
return false;
}
return Yap_unify(ARG2, MkAtomTerm(at));
} else if (!IsAtomTerm(t2)) {
Yap_Error(TYPE_ERROR_ATOM, t2, "atom_to_term/2");
return (FALSE);
} else {
at = AtomOfTerm(t2);
}
ctl = TermNil;
return (rc = Yap_BufferToTerm(RepAtom(at)->UStrOfAE,
strlen(RepAtom(at)->StrOfAE), ctl)) &&
Yap_unify(rc, ARG1);
}
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);
;
Yap_InitCPred("term_to_string", 3, term_to_string, 0);
Yap_InitCPred("term_to_atom", 3, term_to_atom, 0);
Yap_InitCPred("write_depth", 3, p_write_depth, SafePredFlag | SyncPredFlag);
;
Yap_InitCPred("$VAR", 2, dollar_var, SafePredFlag);
;
}