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yap-6.3/C/iopreds.c

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/*************************************************************************
* *
* 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 Streams, Simple Input/Output,
*
*/
#include "Yap.h"
#include "Yatom.h"
#include "YapHeap.h"
#include "yapio.h"
#include "eval.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__)
#include <windows.h>
#ifndef S_ISDIR
#define S_ISDIR(x) (((x)&_S_IFDIR)==_S_IFDIR)
#endif
#endif
#include "iopreds.h"
STATIC_PROTO (Int p_set_read_error_handler, ( USES_REGS1 ));
STATIC_PROTO (Int p_get_read_error_handler, ( USES_REGS1 ));
STATIC_PROTO (Int p_read, ( USES_REGS1 ));
STATIC_PROTO (Int p_startline, ( USES_REGS1 ));
STATIC_PROTO (Int p_change_type_of_char, ( USES_REGS1 ));
STATIC_PROTO (Int p_type_of_char, ( USES_REGS1 ));
extern Atom Yap_FileName(IOSTREAM *s);
static Term
StreamName(IOSTREAM *s)
{
return MkAtomTerm(Yap_FileName(s));
}
void
Yap_InitStdStreams (void)
{
}
void
Yap_InitPlIO (void)
{
}
/*
* Used by the prompts to check if they are after a newline, and then a
* prompt should be output, or if we are in the middle of a line.
*/
static int newline = TRUE;
#ifdef DEBUG
static int eolflg = 1;
static char my_line[200] = {0};
static char *lp = my_line;
static YP_File curfile;
#ifdef MACC
static void
InTTYLine(char *line)
{
char *p = line;
char ch;
while ((ch = InKey()) != '\n' && ch != '\r')
if (ch == 8) {
if (line < p)
BackupTTY(*--p);
} else
TTYChar(*p++ = ch);
TTYChar('\n');
*p = 0;
}
#endif
void
Yap_DebugSetIFile(char *fname)
{
if (curfile)
YP_fclose(curfile);
curfile = YP_fopen(fname, "r");
if (curfile == NULL) {
curfile = stdin;
fprintf(stderr,"%% YAP Warning: can not open %s for input\n", fname);
}
}
void
Yap_DebugEndline()
{
*lp = 0;
}
int
Yap_DebugGetc()
{
int ch;
if (eolflg) {
if (curfile != NULL) {
if (YP_fgets(my_line, 200, curfile) == 0)
curfile = NULL;
}
if (curfile == NULL)
if (YP_fgets(my_line, 200, stdin) == NULL) {
return EOF;
}
eolflg = 0;
lp = my_line;
}
if ((ch = *lp++) == 0)
ch = '\n', eolflg = 1;
if (GLOBAL_Option['l' - 96])
putc(ch, GLOBAL_logfile);
return (ch);
}
int
Yap_DebugPutc(int sno, wchar_t ch)
{
if (GLOBAL_Option['l' - 96])
(void) putc(ch, GLOBAL_logfile);
return (putc(ch, GLOBAL_stderr));
}
void
Yap_DebugPlWrite(Term t)
{
Yap_plwrite(t, NULL, 15, 0, 1200);
}
void
Yap_DebugErrorPutc(int c)
{
CACHE_REGS
Yap_DebugPutc (LOCAL_c_error_stream, c);
}
#endif
int
Yap_GetCharForSIGINT(void)
{
int ch;
/* ask for a new line */
fprintf(stderr, "Action (h for help): ");
ch = getc(stdin);
/* first process up to end of line */
while ((fgetc(stdin)) != '\n');
newline = TRUE;
return ch;
}
typedef struct stream_ref
{ struct io_stream *read;
struct io_stream *write;
} stream_ref;
#ifdef BEAM
int beam_write (void)
{
Yap_StartSlots();
Yap_plwrite (ARG1, NULL, 0, 0, 1200);
Yap_CloseSlots();
if (EX != 0L) {
Term ball = Yap_PopTermFromDB(EX);
EX = 0L;
Yap_JumpToEnv(ball);
return(FALSE);
}
return (TRUE);
}
#endif
static void
clean_vars(VarEntry *p)
{
if (p == NULL) return;
p->VarAdr = TermNil;
clean_vars(p->VarLeft);
clean_vars(p->VarRight);
}
static Term
syntax_error (TokEntry * tokptr, IOSTREAM *st, Term *outp)
{
CACHE_REGS
Term info;
int count = 0, out = 0;
Int start, err = 0, end;
Term tf[7];
Term *error = tf+3;
CELL *Hi = H;
/* make sure to globalise variable */
start = tokptr->TokPos;
clean_vars(LOCAL_VarTable);
clean_vars(LOCAL_AnonVarTable);
while (1) {
Term ts[2];
if (H > ASP-1024) {
tf[3] = TermNil;
err = 0;
end = 0;
/* for some reason moving this earlier confuses gcc on solaris */
H = Hi;
break;
}
if (tokptr == LOCAL_toktide) {
err = tokptr->TokPos;
out = count;
}
info = tokptr->TokInfo;
switch (tokptr->Tok) {
case Name_tok:
{
Term t0[1];
t0[0] = MkAtomTerm((Atom)info);
ts[0] = Yap_MkApplTerm(Yap_MkFunctor(AtomAtom,1),1,t0);
}
break;
case Number_tok:
ts[0] = Yap_MkApplTerm(Yap_MkFunctor(AtomNumber,1),1,&(tokptr->TokInfo));
break;
case Var_tok:
{
Term t[3];
VarEntry *varinfo = (VarEntry *)info;
t[0] = MkIntTerm(0);
t[1] = Yap_StringToList(varinfo->VarRep);
if (varinfo->VarAdr == TermNil) {
t[2] = varinfo->VarAdr = MkVarTerm();
} else {
t[2] = varinfo->VarAdr;
}
ts[0] = Yap_MkApplTerm(Yap_MkFunctor(AtomGVar,3),3,t);
}
break;
case String_tok:
{
Term t0 = Yap_StringToList((char *)info);
ts[0] = Yap_MkApplTerm(Yap_MkFunctor(AtomString,1),1,&t0);
}
break;
case WString_tok:
{
Term t0 = Yap_WideStringToList((wchar_t *)info);
ts[0] = Yap_MkApplTerm(Yap_MkFunctor(AtomString,1),1,&t0);
}
break;
case Error_tok:
case eot_tok:
break;
case Ponctuation_tok:
{
char s[2];
s[1] = '\0';
if (Ord (info) == 'l') {
s[0] = '(';
} else {
s[0] = (char)info;
}
ts[0] = MkAtomTerm(Yap_LookupAtom(s));
}
}
if (tokptr->Tok == Ord (eot_tok)) {
*error = TermNil;
end = tokptr->TokPos;
break;
} else if (tokptr->Tok != Ord (Error_tok)) {
ts[1] = MkIntegerTerm(tokptr->TokPos);
*error =
MkPairTerm(Yap_MkApplTerm(FunctorMinus,2,ts),TermNil);
error = RepPair(*error)+1;
count++;
}
tokptr = tokptr->TokNext;
}
/* now we can throw away tokens, so we can unify and possibly overwrite TR */
Yap_unify(*outp, MkVarTerm());
if (IsVarTerm(*outp) && (VarOfTerm(*outp) > H || VarOfTerm(*outp) < H0)) {
tf[0] = Yap_MkNewApplTerm(Yap_MkFunctor(AtomRead,1),1);
} else {
tf[0] = Yap_MkApplTerm(Yap_MkFunctor(AtomRead,1),1,outp);
}
{
Term t[3];
t[0] = MkIntegerTerm(start);
t[1] = MkIntegerTerm(err);
t[2] = MkIntegerTerm(end);
tf[1] = Yap_MkApplTerm(Yap_MkFunctor(AtomBetween,3),3,t);
}
tf[2] = MkAtomTerm(AtomHERE);
tf[4] = MkIntegerTerm(out);
tf[5] = MkIntegerTerm(err);
tf[6] = StreamName(st);
return(Yap_MkApplTerm(FunctorSyntaxError,7,tf));
}
static void
GenerateSyntaxError(Term *tp, TokEntry *tokstart, IOSTREAM *sno USES_REGS)
{
if (tp) {
Term et[2];
Term t = MkVarTerm();
et[1] = MkPairTerm(syntax_error(tokstart, sno, &t), TermNil);
t = MkAtomTerm(AtomSyntaxError);
et[0] = Yap_MkApplTerm(FunctorShortSyntaxError,1,&t);
*tp = Yap_MkApplTerm(FunctorError, 2, et);
}
}
Term
Yap_StringToTerm(char *s,Term *tp)
{
CACHE_REGS
IOSTREAM *sno = Sopenmem(&s, NULL, "r");
Term t;
TokEntry *tokstart;
tr_fr_ptr TR_before_parse;
Term tpos = TermNil;
if (sno == NULL)
return FALSE;
TR_before_parse = TR;
tokstart = LOCAL_tokptr = LOCAL_toktide = Yap_tokenizer(sno, FALSE, &tpos);
if (tokstart == NIL || tokstart->Tok == Ord (eot_tok)) {
if (tp) {
*tp = MkAtomTerm(AtomEOFBeforeEOT);
}
Yap_clean_tokenizer(tokstart, LOCAL_VarTable, LOCAL_AnonVarTable, LOCAL_Comments);
Sclose(sno);
return FALSE;
} else if (LOCAL_ErrorMessage) {
if (tp) {
*tp = MkAtomTerm(Yap_LookupAtom(LOCAL_ErrorMessage));
}
Yap_clean_tokenizer(tokstart, LOCAL_VarTable, LOCAL_AnonVarTable, LOCAL_Comments);
Sclose(sno);
return FALSE;
}
t = Yap_Parse();
TR = TR_before_parse;
if (!t || LOCAL_ErrorMessage) {
GenerateSyntaxError(tp, tokstart, sno PASS_REGS);
Yap_clean_tokenizer(tokstart, LOCAL_VarTable, LOCAL_AnonVarTable, LOCAL_Comments);
Sclose(sno);
return FALSE;
}
Yap_clean_tokenizer(tokstart, LOCAL_VarTable, LOCAL_AnonVarTable, LOCAL_Comments);
Sclose(sno);
return t;
}
Int
Yap_FirstLineInParse (void)
{
CACHE_REGS
return LOCAL_StartLine;
}
static Int
p_startline ( USES_REGS1 )
{
return (Yap_unify_constant (ARG1, MkIntegerTerm (LOCAL_StartLine)));
}
/* control the parser error handler */
static Int
p_set_read_error_handler( USES_REGS1 )
{
Term t = Deref(ARG1);
char *s;
if (IsVarTerm(t)) {
Yap_Error(INSTANTIATION_ERROR,t,"set_read_error_handler");
return(FALSE);
}
if (!IsAtomTerm(t)) {
Yap_Error(TYPE_ERROR_ATOM,t,"bad syntax_error handler");
return(FALSE);
}
s = RepAtom(AtomOfTerm(t))->StrOfAE;
if (!strcmp(s, "fail")) {
ParserErrorStyle = FAIL_ON_PARSER_ERROR;
} else if (!strcmp(s, "error")) {
ParserErrorStyle = EXCEPTION_ON_PARSER_ERROR;
} else if (!strcmp(s, "quiet")) {
ParserErrorStyle = QUIET_ON_PARSER_ERROR;
} else if (!strcmp(s, "dec10")) {
ParserErrorStyle = CONTINUE_ON_PARSER_ERROR;
} else {
Yap_Error(DOMAIN_ERROR_SYNTAX_ERROR_HANDLER,t,"bad syntax_error handler");
return(FALSE);
}
return(TRUE);
}
/* return the status for the parser error handler */
static Int
p_get_read_error_handler( USES_REGS1 )
{
Term t;
switch (ParserErrorStyle) {
case FAIL_ON_PARSER_ERROR:
t = MkAtomTerm(AtomFail);
break;
case EXCEPTION_ON_PARSER_ERROR:
t = MkAtomTerm(AtomError);
break;
case QUIET_ON_PARSER_ERROR:
t = MkAtomTerm(AtomQuiet);
break;
case CONTINUE_ON_PARSER_ERROR:
t = MkAtomTerm(AtomDec10);
break;
default:
Yap_Error(SYSTEM_ERROR,TermNil,"corrupted syntax_error handler");
return(FALSE);
}
return (Yap_unify_constant (ARG1, t));
}
int
Yap_readTerm(void *st0, Term *tp, Term *varnames, Term *terror, Term *tpos)
{
CACHE_REGS
TokEntry *tokstart;
Term pt;
IOSTREAM *st = (IOSTREAM *)st0;
if (st == NULL) {
return FALSE;
}
tokstart = LOCAL_tokptr = LOCAL_toktide = Yap_tokenizer(st, FALSE, tpos);
if (LOCAL_ErrorMessage)
{
Yap_clean_tokenizer(tokstart, LOCAL_VarTable, LOCAL_AnonVarTable, LOCAL_Comments);
if (terror)
*terror = MkAtomTerm(Yap_LookupAtom(LOCAL_ErrorMessage));
Yap_clean_tokenizer(tokstart, LOCAL_VarTable, LOCAL_AnonVarTable, LOCAL_Comments);
return FALSE;
}
pt = Yap_Parse();
if (LOCAL_ErrorMessage || pt == (CELL)0) {
GenerateSyntaxError(terror, tokstart, st PASS_REGS);
Yap_clean_tokenizer(tokstart, LOCAL_VarTable, LOCAL_AnonVarTable, LOCAL_Comments);
return FALSE;
}
if (varnames) {
*varnames = Yap_VarNames(LOCAL_VarTable, TermNil);
if (!*varnames) {
Yap_clean_tokenizer(tokstart, LOCAL_VarTable, LOCAL_AnonVarTable, LOCAL_Comments);
return FALSE;
}
}
*tp = pt;
if (!pt)
return FALSE;
return TRUE;
}
/*
Assumes
Flag: ARG1
Term: ARG2
Module: ARG3
Vars: ARG4
Pos: ARG5
Err: ARG6
Comments: ARG7
*/
static Int
do_read(IOSTREAM *inp_stream, int nargs USES_REGS)
{
Term t, v;
TokEntry *tokstart;
Term tmod = Deref(ARG3), OCurrentModule = CurrentModule, tpos;
extern void Yap_setCurrentSourceLocation(IOSTREAM **s);
Term tcomms = Deref(ARG7);
int store_comments = IsVarTerm(tcomms);
Yap_setCurrentSourceLocation(&inp_stream);
if (IsVarTerm(tmod)) {
tmod = CurrentModule;
} else if (!IsAtomTerm(tmod)) {
Yap_Error(TYPE_ERROR_ATOM, tmod, "read_term/2");
return FALSE;
}
LOCAL_Error_TYPE = YAP_NO_ERROR;
while (TRUE) {
CELL *old_H;
int64_t cpos = 0;
int seekable = inp_stream->functions->seek != NULL;
/* two cases where we can seek: memory and console */
if (seekable) {
cpos = inp_stream->posbuf.byteno;
}
/* Scans the term using stack space */
while (TRUE) {
old_H = H;
tpos = Yap_StreamPosition(inp_stream);
LOCAL_Comments = TermNil;
LOCAL_CommentsNextChar = LOCAL_CommentsTail = NULL;
tokstart = LOCAL_tokptr = LOCAL_toktide = Yap_tokenizer(inp_stream, store_comments, &tpos);
if (LOCAL_Error_TYPE != YAP_NO_ERROR && seekable) {
H = old_H;
Yap_clean_tokenizer(tokstart, LOCAL_VarTable, LOCAL_AnonVarTable, LOCAL_Comments);
if (seekable) {
Sseek64(inp_stream, cpos, SIO_SEEK_SET);
}
if (LOCAL_Error_TYPE == OUT_OF_TRAIL_ERROR) {
LOCAL_Error_TYPE = YAP_NO_ERROR;
if (!Yap_growtrail (sizeof(CELL) * K16, FALSE)) {
return FALSE;
}
} else if (LOCAL_Error_TYPE == OUT_OF_AUXSPACE_ERROR) {
LOCAL_Error_TYPE = YAP_NO_ERROR;
if (!Yap_ExpandPreAllocCodeSpace(0, NULL, TRUE)) {
return FALSE;
}
} else if (LOCAL_Error_TYPE == OUT_OF_HEAP_ERROR) {
LOCAL_Error_TYPE = YAP_NO_ERROR;
if (!Yap_growheap(FALSE, 0, NULL)) {
return FALSE;
}
} else if (LOCAL_Error_TYPE == OUT_OF_STACK_ERROR) {
LOCAL_Error_TYPE = YAP_NO_ERROR;
if (!Yap_gcl(LOCAL_Error_Size, nargs, ENV, CP)) {
return FALSE;
}
}
} else {
/* done with this */
break;
}
}
if (!Yap_unify(tpos,ARG5)) {
/* do this early so that we do not have to protect it in case of stack expansion */
return FALSE;
}
LOCAL_Error_TYPE = YAP_NO_ERROR;
/* preserve value of H after scanning: otherwise we may lose strings
and floats */
old_H = H;
if (tokstart != NULL && tokstart->Tok == Ord (eot_tok)) {
/* did we get the end of file from an abort? */
if (LOCAL_ErrorMessage &&
!strcmp(LOCAL_ErrorMessage,"Abort")) {
Yap_clean_tokenizer(tokstart, LOCAL_VarTable, LOCAL_AnonVarTable, LOCAL_Comments);
return FALSE;
} else {
Yap_clean_tokenizer(tokstart, LOCAL_VarTable, LOCAL_AnonVarTable, LOCAL_Comments);
if (store_comments && !Yap_unify(LOCAL_Comments, ARG7))
return FALSE;
return Yap_unify_constant(ARG2, MkAtomTerm (AtomEof))
&& Yap_unify_constant(ARG4, TermNil);
}
}
repeat_cycle:
CurrentModule = tmod;
if (LOCAL_ErrorMessage || (t = Yap_Parse()) == 0) {
CurrentModule = OCurrentModule;
if (LOCAL_ErrorMessage) {
int res;
if (!strcmp(LOCAL_ErrorMessage,"Stack Overflow") ||
!strcmp(LOCAL_ErrorMessage,"Trail Overflow") ||
!strcmp(LOCAL_ErrorMessage,"Heap Overflow")) {
/* ignore term we just built */
tr_fr_ptr old_TR = TR;
H = old_H;
TR = (tr_fr_ptr)LOCAL_ScannerStack;
if (!strcmp(LOCAL_ErrorMessage,"Stack Overflow"))
res = Yap_growstack_in_parser(&old_TR, &tokstart, &LOCAL_VarTable);
else if (!strcmp(LOCAL_ErrorMessage,"Heap Overflow"))
res = Yap_growheap_in_parser(&old_TR, &tokstart, &LOCAL_VarTable);
else
res = Yap_growtrail_in_parser(&old_TR, &tokstart, &LOCAL_VarTable);
if (res) {
LOCAL_ScannerStack = (char *)TR;
TR = old_TR;
old_H = H;
LOCAL_tokptr = LOCAL_toktide = tokstart;
LOCAL_ErrorMessage = NULL;
goto repeat_cycle;
}
LOCAL_ScannerStack = (char *)TR;
TR = old_TR;
}
}
if (ParserErrorStyle == QUIET_ON_PARSER_ERROR) {
/* just fail */
Yap_clean_tokenizer(tokstart, LOCAL_VarTable, LOCAL_AnonVarTable, LOCAL_Comments);
return FALSE;
} else if (ParserErrorStyle == CONTINUE_ON_PARSER_ERROR) {
LOCAL_ErrorMessage = NULL;
/* try again */
goto repeat_cycle;
} else {
Term terr = syntax_error(tokstart, inp_stream, &ARG2);
if (LOCAL_ErrorMessage == NULL)
LOCAL_ErrorMessage = "SYNTAX ERROR";
if (ParserErrorStyle == EXCEPTION_ON_PARSER_ERROR) {
Yap_clean_tokenizer(tokstart, LOCAL_VarTable, LOCAL_AnonVarTable, LOCAL_Comments);
Yap_Error(SYNTAX_ERROR,terr,LOCAL_ErrorMessage);
return FALSE;
} else /* FAIL ON PARSER ERROR */ {
Term t[2];
t[0] = terr;
t[1] = MkAtomTerm(Yap_LookupAtom(LOCAL_ErrorMessage));
Yap_clean_tokenizer(tokstart, LOCAL_VarTable, LOCAL_AnonVarTable, LOCAL_Comments);
return Yap_unify(ARG6,Yap_MkApplTerm(Yap_MkFunctor(AtomError,2),2,t));
}
}
} else {
CurrentModule = OCurrentModule;
/* parsing succeeded */
break;
}
}
if (!Yap_unify(t, ARG2))
return FALSE;
if (store_comments && !Yap_unify(LOCAL_Comments, ARG7))
return FALSE;
if (AtomOfTerm (Deref (ARG1)) == AtomTrue) {
while (TRUE) {
CELL *old_H = H;
if (setjmp(LOCAL_IOBotch) == 0) {
v = Yap_VarNames(LOCAL_VarTable, TermNil);
break;
} else {
tr_fr_ptr old_TR;
restore_machine_regs();
old_TR = TR;
/* restart global */
H = old_H;
TR = (tr_fr_ptr)LOCAL_ScannerStack;
Yap_growstack_in_parser(&old_TR, &tokstart, &LOCAL_VarTable);
LOCAL_ScannerStack = (char *)TR;
TR = old_TR;
}
}
Yap_clean_tokenizer(tokstart, LOCAL_VarTable, LOCAL_AnonVarTable, LOCAL_Comments);
return Yap_unify (v, ARG4);
} else {
Yap_clean_tokenizer(tokstart, LOCAL_VarTable, LOCAL_AnonVarTable, LOCAL_Comments);
return TRUE;
}
}
static Int
p_read ( USES_REGS1 )
{ /* '$read'(+Flag,?Term,?Module,?Vars,-Pos,-Err) */
IOSTREAM *Yap_Scurin(void);
return do_read(Yap_Scurin(), 7 PASS_REGS);
}
static Int
p_read2 ( USES_REGS1 )
{ /* '$read2'(+Flag,?Term,?Module,?Vars,-Pos,-Err,+Stream) */
IOSTREAM *inp_stream;
Int out;
Term t8 = Deref(ARG8);
if (IsVarTerm(t8)) {
Yap_Error(INSTANTIATION_ERROR,t8,"read_term/3");
return FALSE;
}
if (!IsAtomTerm(t8)) {
Yap_Error(TYPE_ERROR_LIST,t8,"read_term/3");
return(FALSE);
}
if (!(inp_stream = Yap_GetInputStream(AtomOfTerm(t8))) ) {
return(FALSE);
}
out = do_read(inp_stream, 8 PASS_REGS);
return out;
}
#if HAVE_SELECT && FALSE
/* stream_select(+Streams,+TimeOut,-Result) */
static Int
p_stream_select( USES_REGS1 )
{
Term t1 = Deref(ARG1), t2;
fd_set readfds, writefds, exceptfds;
struct timeval timeout, *ptime;
#if _MSC_VER
u_int fdmax=0;
#else
int fdmax=0;
#endif
Term tout = TermNil, ti, Head;
if (IsVarTerm(t1)) {
Yap_Error(INSTANTIATION_ERROR,t1,"stream_select/3");
return FALSE;
}
if (!IsPairTerm(t1)) {
Yap_Error(TYPE_ERROR_LIST,t1,"stream_select/3");
return(FALSE);
}
FD_ZERO(&readfds);
FD_ZERO(&writefds);
FD_ZERO(&exceptfds);
ti = t1;
while (ti != TermNil) {
#if _MSC_VER
u_int fd;
#else
int fd;
#endif
int sno;
Head = HeadOfTerm(ti);
sno = CheckStream(Head, Input_Stream_f, "stream_select/3");
if (sno < 0)
return(FALSE);
fd = GetStreamFd(sno);
FD_SET(fd, &readfds);
UNLOCK(Stream[sno].streamlock);
if (fd > fdmax)
fdmax = fd;
ti = TailOfTerm(ti);
}
t2 = Deref(ARG2);
if (IsVarTerm(t2)) {
Yap_Error(INSTANTIATION_ERROR,t2,"stream_select/3");
return(FALSE);
}
if (IsAtomTerm(t2)) {
if (t2 == MkAtomTerm(AtomOff)) {
/* wait indefinitely */
ptime = NULL;
} else {
Yap_Error(DOMAIN_ERROR_TIMEOUT_SPEC,t1,"stream_select/3");
return(FALSE);
}
} else {
Term t21, t22;
if (!IsApplTerm(t2) || FunctorOfTerm(t2) != FunctorModule) {
Yap_Error(DOMAIN_ERROR_TIMEOUT_SPEC,t2,"stream_select/3");
return(FALSE);
}
t21 = ArgOfTerm(1, t2);
if (IsVarTerm(t21)) {
Yap_Error(INSTANTIATION_ERROR,t2,"stream_select/3");
return(FALSE);
}
if (!IsIntegerTerm(t21)) {
Yap_Error(DOMAIN_ERROR_TIMEOUT_SPEC,t2,"stream_select/3");
return(FALSE);
}
timeout.tv_sec = IntegerOfTerm(t21);
if (timeout.tv_sec < 0) {
Yap_Error(DOMAIN_ERROR_TIMEOUT_SPEC,t2,"stream_select/3");
return(FALSE);
}
t22 = ArgOfTerm(2, t2);
if (IsVarTerm(t22)) {
Yap_Error(INSTANTIATION_ERROR,t2,"stream_select/3");
return(FALSE);
}
if (!IsIntegerTerm(t22)) {
Yap_Error(DOMAIN_ERROR_TIMEOUT_SPEC,t2,"stream_select/3");
return(FALSE);
}
timeout.tv_usec = IntegerOfTerm(t22);
if (timeout.tv_usec < 0) {
Yap_Error(DOMAIN_ERROR_TIMEOUT_SPEC,t2,"stream_select/3");
return(FALSE);
}
ptime = &timeout;
}
/* do the real work */
if (select(fdmax+1, &readfds, &writefds, &exceptfds, ptime) < 0) {
#if HAVE_STRERROR
Yap_Error(SYSTEM_ERROR, TermNil,
"stream_select/3 (select: %s)", strerror(errno));
#else
Yap_Error(SYSTEM_ERROR, TermNil,
"stream_select/3 (select)");
#endif
}
while (t1 != TermNil) {
int fd;
int sno;
Head = HeadOfTerm(t1);
sno = CheckStream(Head, Input_Stream_f, "stream_select/3");
fd = GetStreamFd(sno);
if (FD_ISSET(fd, &readfds))
tout = MkPairTerm(Head,tout);
else
tout = MkPairTerm(TermNil,tout);
UNLOCK(Stream[sno].streamlock);
t1 = TailOfTerm(t1);
}
/* we're done, just pass the info back */
return(Yap_unify(ARG3,tout));
}
#endif
static Int
p_change_type_of_char ( USES_REGS1 )
{ /* change_type_of_char(+char,+type) */
Term t1 = Deref (ARG1);
Term t2 = Deref (ARG2);
if (!IsVarTerm (t1) && !IsIntegerTerm (t1))
return FALSE;
if (!IsVarTerm(t2) && !IsIntegerTerm(t2))
return FALSE;
Yap_chtype[IntegerOfTerm(t1)] = IntegerOfTerm(t2);
return TRUE;
}
static Int
p_type_of_char ( USES_REGS1 )
{ /* type_of_char(+char,-type) */
Term t;
Term t1 = Deref (ARG1);
if (!IsVarTerm (t1) && !IsIntegerTerm (t1))
return FALSE;
t = MkIntTerm(Yap_chtype[IntegerOfTerm (t1)]);
return Yap_unify(t,ARG2);
}
static Int
p_force_char_conversion( USES_REGS1 )
{
/* don't actually enable it until someone tries to add a conversion */
if (CharConversionTable2 == NULL)
return(TRUE);
CharConversionTable = CharConversionTable2;
return(TRUE);
}
static Int
p_disable_char_conversion( USES_REGS1 )
{
int i;
for (i = 0; i < MaxStreams; i++) {
if (!(Stream[i].status & Free_Stream_f))
Stream[i].stream_wgetc_for_read = Stream[i].stream_wgetc;
}
CharConversionTable = NULL;
return(TRUE);
}
static Int
p_char_conversion( USES_REGS1 )
{
Term t0 = Deref(ARG1), t1 = Deref(ARG2);
char *s0, *s1;
if (IsVarTerm(t0)) {
Yap_Error(INSTANTIATION_ERROR, t0, "char_conversion/2");
return (FALSE);
}
if (!IsAtomTerm(t0)) {
Yap_Error(REPRESENTATION_ERROR_CHARACTER, t0, "char_conversion/2");
return (FALSE);
}
s0 = RepAtom(AtomOfTerm(t0))->StrOfAE;
if (s0[1] != '\0') {
Yap_Error(REPRESENTATION_ERROR_CHARACTER, t0, "char_conversion/2");
return (FALSE);
}
if (IsVarTerm(t1)) {
Yap_Error(INSTANTIATION_ERROR, t1, "char_conversion/2");
return (FALSE);
}
if (!IsAtomTerm(t1)) {
Yap_Error(REPRESENTATION_ERROR_CHARACTER, t1, "char_conversion/2");
return (FALSE);
}
s1 = RepAtom(AtomOfTerm(t1))->StrOfAE;
if (s1[1] != '\0') {
Yap_Error(REPRESENTATION_ERROR_CHARACTER, t1, "char_conversion/2");
return (FALSE);
}
/* check if we do have a table for converting characters */
if (CharConversionTable2 == NULL) {
int i;
/* don't create a table if we don't need to */
if (s0[0] == s1[0])
return(TRUE);
CharConversionTable2 = Yap_AllocCodeSpace(NUMBER_OF_CHARS*sizeof(char));
while (CharConversionTable2 == NULL) {
if (!Yap_growheap(FALSE, NUMBER_OF_CHARS*sizeof(char), NULL)) {
Yap_Error(OUT_OF_HEAP_ERROR, TermNil, LOCAL_ErrorMessage);
return(FALSE);
}
}
if (yap_flags[CHAR_CONVERSION_FLAG] != 0) {
if (p_force_char_conversion( PASS_REGS1 ) == FALSE)
return(FALSE);
}
for (i = 0; i < NUMBER_OF_CHARS; i++)
CharConversionTable2[i] = i;
}
/* just add the new entry */
CharConversionTable2[(int)s0[0]] = s1[0];
/* done */
return(TRUE);
}
static Int
p_current_char_conversion( USES_REGS1 )
{
Term t0, t1;
char *s0, *s1;
if (CharConversionTable == NULL) {
return(FALSE);
}
t0 = Deref(ARG1);
if (IsVarTerm(t0)) {
Yap_Error(INSTANTIATION_ERROR, t0, "current_char_conversion/2");
return (FALSE);
}
if (!IsAtomTerm(t0)) {
Yap_Error(REPRESENTATION_ERROR_CHARACTER, t0, "current_char_conversion/2");
return (FALSE);
}
s0 = RepAtom(AtomOfTerm(t0))->StrOfAE;
if (s0[1] != '\0') {
Yap_Error(REPRESENTATION_ERROR_CHARACTER, t0, "current_char_conversion/2");
return (FALSE);
}
t1 = Deref(ARG2);
if (IsVarTerm(t1)) {
char out[2];
if (CharConversionTable[(int)s0[0]] == '\0') return(FALSE);
out[0] = CharConversionTable[(int)s0[0]];
out[1] = '\0';
return(Yap_unify(ARG2,MkAtomTerm(Yap_LookupAtom(out))));
}
if (!IsAtomTerm(t1)) {
Yap_Error(REPRESENTATION_ERROR_CHARACTER, t1, "current_char_conversion/2");
return (FALSE);
}
s1 = RepAtom(AtomOfTerm(t1))->StrOfAE;
if (s1[1] != '\0') {
Yap_Error(REPRESENTATION_ERROR_CHARACTER, t1, "current_char_conversion/2");
return (FALSE);
} else {
return (CharConversionTable[(int)s0[0]] == '\0' &&
CharConversionTable[(int)s0[0]] == s1[0] );
}
}
static Int
p_all_char_conversions( USES_REGS1 )
{
Term out = TermNil;
int i;
if (CharConversionTable == NULL) {
return(FALSE);
}
for (i = NUMBER_OF_CHARS; i > 0; ) {
i--;
if (CharConversionTable[i] != '\0') {
Term t1, t2;
char s[2];
s[1] = '\0';
s[0] = CharConversionTable[i];
t1 = MkAtomTerm(Yap_LookupAtom(s));
out = MkPairTerm(t1,out);
s[0] = i;
t2 = MkAtomTerm(Yap_LookupAtom(s));
out = MkPairTerm(t2,out);
}
}
return(Yap_unify(ARG1,out));
}
static Int
p_float_format( USES_REGS1 )
{
Term in = Deref(ARG1);
if (IsVarTerm(in))
return Yap_unify(ARG1, MkAtomTerm(AtomFloatFormat));
AtomFloatFormat = AtomOfTerm(in);
return TRUE;
}
void
Yap_InitBackIO (void)
{
}
#if DEBUG
static Int
p_write_string( USES_REGS1 )
{
Term in = Deref(ARG1);
char *s;
size_t length;
int encoding;
char buf[256];
if ((s = Yap_TermToString( in, NULL, 0, &length, &encoding, 0)))
fprintf(stderr,"%ld %s\n",length, s);
if ((s = Yap_TermToString( in, buf, 256, &length, &encoding, 0)))
fprintf(stderr,"%ld %s\n",length, s);
return TRUE;
}
#endif
void
Yap_InitIOPreds(void)
{
if (!Stream)
Stream = (StreamDesc *)Yap_AllocCodeSpace(sizeof(StreamDesc)*MaxStreams);
/* here the Input/Output predicates */
Yap_InitCPred ("$set_read_error_handler", 1, p_set_read_error_handler, SafePredFlag|SyncPredFlag);
Yap_InitCPred ("$get_read_error_handler", 1, p_get_read_error_handler, SafePredFlag|SyncPredFlag);
Yap_InitCPred ("$read", 7, p_read, SyncPredFlag|UserCPredFlag);
Yap_InitCPred ("$read", 8, p_read2, SyncPredFlag|UserCPredFlag);
#if DEBUG
Yap_InitCPred ("write_string", 2, p_write_string, SyncPredFlag|UserCPredFlag);
#endif
Yap_InitCPred ("$start_line", 1, p_startline, SafePredFlag|SyncPredFlag);
Yap_InitCPred ("$change_type_of_char", 2, p_change_type_of_char, SafePredFlag|SyncPredFlag);
Yap_InitCPred ("$type_of_char", 2, p_type_of_char, SafePredFlag|SyncPredFlag);
Yap_InitCPred ("char_conversion", 2, p_char_conversion, SyncPredFlag);
Yap_InitCPred ("$current_char_conversion", 2, p_current_char_conversion, SyncPredFlag);
Yap_InitCPred ("$all_char_conversions", 1, p_all_char_conversions, SyncPredFlag);
Yap_InitCPred ("$force_char_conversion", 0, p_force_char_conversion, SyncPredFlag);
Yap_InitCPred ("$disable_char_conversion", 0, p_disable_char_conversion, SyncPredFlag);
#if HAVE_SELECT
// Yap_InitCPred ("stream_select", 3, p_stream_select, SafePredFlag|SyncPredFlag);
#endif
Yap_InitCPred ("$float_format", 1, p_float_format, SafePredFlag|SyncPredFlag);
}
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