645 lines
16 KiB
C
645 lines
16 KiB
C
/*************************************************************************
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* *
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* YAP Prolog *
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* *
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* Yap Prolog was developed at NCCUP - Universidade do Porto *
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* *
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* Copyright L.Damas, V.S.Costa and Universidade do Porto 1985-1997 *
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* *
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**************************************************************************
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* *
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* File: iopreds.c *
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* Last rev: 5/2/88 *
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* mods: *
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* comments: Input/Output C implemented predicates *
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* *
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*************************************************************************/
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#ifdef SCCS
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static char SccsId[] = "%W% %G%";
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#endif
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/*
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* This file includes the definition of a miscellania of standard predicates
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* for yap refering to: Files and GLOBAL_Streams, Simple Input/Output,
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*
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*/
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#include "Yap.h"
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#include "Yatom.h"
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#include "YapHeap.h"
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#include "yapio.h"
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#include "eval.h"
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#include "YapText.h"
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#include <stdlib.h>
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#if HAVE_STDARG_H
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#include <stdarg.h>
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#endif
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#if HAVE_CTYPE_H
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#include <ctype.h>
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#endif
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#if HAVE_WCTYPE_H
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#include <wctype.h>
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#endif
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#if HAVE_LIMITS_H
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#include <limits.h>
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#endif
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#if HAVE_SYS_PARAMS_H
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#include <sys/params.h>
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#endif
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#if HAVE_SYS_TYPES_H
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#include <sys/types.h>
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#endif
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#ifdef HAVE_SYS_STAT_H
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#include <sys/stat.h>
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#endif
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#if HAVE_SYS_SELECT_H && !_MSC_VER && !defined(__MINGW32__)
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#include <sys/select.h>
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#endif
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#if HAVE_STRING_H
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#include <string.h>
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#endif
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#if HAVE_LIBGEN_H
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#include <libgen.h>
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#endif
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#if HAVE_SIGNAL_H
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#include <signal.h>
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#endif
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#if HAVE_FCNTL_H
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/* for O_BINARY and O_TEXT in WIN32 */
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#include <fcntl.h>
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#endif
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#ifdef _WIN32
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#if HAVE_IO_H
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/* Windows */
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#include <io.h>
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#endif
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#endif
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#if !HAVE_STRNCAT
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#define strncat(X,Y,Z) strcat(X,Y)
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#endif
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#if !HAVE_STRNCPY
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#define strncpy(X,Y,Z) strcpy(X,Y)
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#endif
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#if _MSC_VER || defined(__MINGW32__)
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#if HAVE_SOCKET
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#include <winsock2.h>
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#endif
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#include <windows.h>
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#ifndef S_ISDIR
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#define S_ISDIR(x) (((x)&_S_IFDIR)==_S_IFDIR)
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#endif
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#endif
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#include "iopreds.h"
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#if _MSC_VER || defined(__MINGW32__)
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#define SYSTEM_STAT _stat
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#else
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#define SYSTEM_STAT stat
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#endif
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static Int
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file_name_extension(USES_REGS1)
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{
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Term t1 = Deref(ARG1);
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Term t2 = Deref(ARG2);
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Term t3 = Deref(ARG3);
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bool use_string = false;
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loop:
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if (!IsVarTerm((t3))) {
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const char *f;
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if (IsAtomTerm(t3)) {
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f = AtomName( AtomOfTerm( t3 ) );
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} else if (IsStringTerm( t3 )) {
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f = StringOfTerm( t3 );
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use_string = true;
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} else if (IsApplTerm(t3) && FunctorOfTerm(t3) == FunctorSlash) {
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// descend a compound term of the form a/b.
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Term tn1 = MkVarTerm(), tf1;
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Term ts[2];
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ts[0] = ArgOfTerm(1,t3);
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ts[1] = tn1;
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tf1 = Yap_MkApplTerm( FunctorSlash, 2, ts );
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if (!Yap_unify(ARG1, tf1)) {
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return false;
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}
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t3 = ArgOfTerm(2, t3);
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goto loop;
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} else {
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Yap_Error(TYPE_ERROR_ATOMIC, t3, "file_name_extension/3");
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return false;
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}
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char *pts = strrchr(f, '/');
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#if WIN32_ssss
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char *pts1 = strrchr(f, '\\');
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if (pts11 > pts) pts = pts1;
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#endif
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char *ss = strrchr(f, '.');
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if (pts > ss) ss = NULL;
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if (use_string) {
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char *tmp;
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if (!ss) {
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return Yap_unify(ARG1, ARG3) &&
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Yap_unify(ARG2, MkStringTerm( "" ) );
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}
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tmp = malloc((ss - f)+1);
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strncpy(tmp, f, (ss)-f);
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if (!Yap_unify(ARG1, MkStringTerm( tmp )) ) {
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if (tmp != f)
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free( tmp );
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return false;
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}
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if (tmp != f)
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free(tmp);
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// without and with dot
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if (!Yap_unify(ARG2, MkStringTerm(ss+1)))
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return Yap_unify(ARG2, MkStringTerm(ss));
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return true;
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} else {
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char *tmp;
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if (!ss) {
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return Yap_unify(ARG1, ARG3) &&
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Yap_unify(ARG2, MkAtomTerm(Yap_LookupAtom( "" ) ));
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}
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tmp = malloc((ss - f)+1);
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strncpy(tmp, f, (ss)-f);
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if (!Yap_unify(ARG1, MkAtomTerm(Yap_LookupAtom( tmp ))) ) {
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if (tmp != f)
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free( tmp );
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return false;
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}
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if (tmp != f)
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free(tmp);
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// without and with dot
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if (!Yap_unify(ARG2, MkAtomTerm(Yap_LookupAtom(ss+1))))
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return Yap_unify(ARG2, MkAtomTerm(Yap_LookupAtom(ss)));
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return true;
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}
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} else {
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char s[MAXPATHLEN+1];
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const char *f1, *f2;
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loop1:
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if (IsVarTerm(t1)) {
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Yap_Error(INSTANTIATION_ERROR, t1, "access");
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return FALSE;
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} else if (IsAtomTerm(t1)) {
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f1 = AtomName( AtomOfTerm( t1 ) );
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} else if (IsStringTerm( t1 )) {
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f1 = StringOfTerm( t1 );
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use_string = true;
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} else if (IsApplTerm(t1) && FunctorOfTerm(t1) == FunctorSlash) {
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// descend a compound term of the form a/b.
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Term tn1 = MkVarTerm(), tf1;
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Term ts[2];
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ts[0] = ArgOfTerm(1,t1);
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ts[1] = tn1;
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tf1 = Yap_MkApplTerm( FunctorSlash, 2, ts );
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if (!Yap_unify(ARG3, tf1)) {
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return false;
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}
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t1 = ArgOfTerm(2, t1);
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goto loop1;
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} else {
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Yap_Error(TYPE_ERROR_ATOMIC, t1, "file_name_extension/3");
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return false;
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}
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if (IsVarTerm(t2)) {
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Yap_Error(INSTANTIATION_ERROR, t2, "access");
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return FALSE;
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} else if (IsAtomTerm(t2)) {
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f2 = AtomName( AtomOfTerm( t2 ) );
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} else if (IsStringTerm( t1 )) {
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f2 = StringOfTerm( t2 );
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use_string = true;
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} else {
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Yap_Error(TYPE_ERROR_ATOMIC, t2, "file_name_extension/3");
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return false;
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}
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if (f2[0] == '.') {
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strncpy(s,f1,MAXPATHLEN);
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strncat(s,f2,MAXPATHLEN);
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if (use_string)
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return Yap_unify_constant(ARG3,MkStringTerm(s));
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else
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return Yap_unify_constant(ARG3,MkAtomTerm(Yap_LookupAtom(s)));
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} else {
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strncpy(s,f1,MAXPATHLEN);
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strncat(s,".",MAXPATHLEN);
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strncat(s,f2,MAXPATHLEN);
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if (use_string)
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return Yap_unify_constant(ARG3,MkStringTerm(s));
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else
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return Yap_unify_constant(ARG3,MkAtomTerm(Yap_LookupAtom(s)));
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}
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}
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}
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static Int
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access_path(USES_REGS1)
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{
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Term tname = Deref(ARG1);
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char *file_name;
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if (IsVarTerm(tname)) {
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Yap_Error(INSTANTIATION_ERROR, tname, "access");
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return FALSE;
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} else if (!IsAtomTerm (tname)) {
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Yap_Error(TYPE_ERROR_ATOM, tname, "access");
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return FALSE;
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} else {
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#if HAVE_STAT
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struct SYSTEM_STAT ss;
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file_name = RepAtom(AtomOfTerm(tname))->StrOfAE;
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if (SYSTEM_STAT(file_name, &ss) != 0) {
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/* ignore errors while checking a file */
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return FALSE;
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}
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return TRUE;
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#else
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return FALSE;
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#endif
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}
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}
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static Int
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exists_file(USES_REGS1)
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{
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Term tname = Deref(ARG1);
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char *file_name;
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if (IsVarTerm(tname)) {
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Yap_Error(INSTANTIATION_ERROR, tname, "access");
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return FALSE;
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} else if (!IsAtomTerm (tname)) {
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Yap_Error(TYPE_ERROR_ATOM, tname, "access");
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return FALSE;
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} else {
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#if HAVE_STAT
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struct SYSTEM_STAT ss;
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file_name = RepAtom(AtomOfTerm(tname))->StrOfAE;
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if (SYSTEM_STAT(file_name, &ss) != 0) {
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/* ignore errors while checking a file */
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return FALSE;
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}
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return (S_ISREG(ss.st_mode));
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#else
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return FALSE;
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#endif
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}
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}
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static Int
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time_file(USES_REGS1)
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{
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Term tname = Deref(ARG1);
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if (IsVarTerm(tname)) {
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Yap_Error(INSTANTIATION_ERROR, tname, "access");
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return FALSE;
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} else if (!IsAtomTerm (tname)) {
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Yap_Error(TYPE_ERROR_ATOM, tname, "access");
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return FALSE;
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} else {
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const char *n = RepAtom(AtomOfTerm(tname))->StrOfAE;
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#if __WIN32
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FILETIME ftWrite;
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if ((hdl = CreateFile( n, 0, 0, NULL, OPEN_EXISTING, NULL)) == 0)
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return false;
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if (GetFileTime(hdl, NULL,NULL,&ftWrite))
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return false;
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// Convert the last-write time to local time.
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// FileTimeToSystemTime(&ftWrite, &stUTC);
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// SystemTimeToTzSpecificLocalTime(NULL, &stUTC, &stLocal);
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CloseHandle( hdl );
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return Yap_unify(ARG2, MkIntegerTerm(ftWrite));
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#elif HAVE_STAT
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struct SYSTEM_STAT ss;
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if (SYSTEM_STAT(n, &ss) != 0) {
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/* ignore errors while checking a file */
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return FALSE;
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}
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return Yap_unify(ARG2, MkIntegerTerm(ss.st_mtime));
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#else
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return FALSE;
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#endif
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}
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}
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static Int
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file_size(USES_REGS1)
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{
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Int sno = Yap_CheckStream (ARG1, (Input_Stream_f | Output_Stream_f | Socket_Stream_f), "file_size/2");
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if (sno < 0)
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return (FALSE);
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if (GLOBAL_Stream[sno]. status & Seekable_Stream_f &&
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!(GLOBAL_Stream[sno]. status & (InMemory_Stream_f|Socket_Stream_f|Pipe_Stream_f))) {
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// there
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struct stat file_stat;
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if (fstat(fileno(GLOBAL_Stream[sno].file), &file_stat) < 0) {
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UNLOCK(GLOBAL_Stream[sno].streamlock);
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PlIOError( PERMISSION_ERROR_INPUT_STREAM, ARG1, "%s in file_size/2", strerror(errno));
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return false;
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}
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// and back again
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UNLOCK(GLOBAL_Stream[sno].streamlock);
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return Yap_unify_constant( ARG2, MkIntegerTerm( file_stat.st_size) );
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}
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UNLOCK(GLOBAL_Stream[sno].streamlock);
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return false;
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}
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/** @pred access_file( + Name, -
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*/
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static Int
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access_file(USES_REGS1)
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{
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Term tname = Deref(ARG1);
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Term tmode = Deref(ARG2);
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char ares[YAP_FILENAME_MAX];
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Atom atmode;
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if (IsVarTerm(tmode)) {
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Yap_Error(INSTANTIATION_ERROR, tmode, "access_file/2");
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return FALSE;
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} else if (!IsAtomTerm (tmode)) {
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Yap_Error(TYPE_ERROR_ATOM, tname, "access_file/2");
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return FALSE;
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}
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atmode = AtomOfTerm(tmode);
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if (IsVarTerm(tname)) {
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Yap_Error(INSTANTIATION_ERROR, tname, "access_file/2");
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return FALSE;
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} else if (!IsAtomTerm (tname)) {
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Yap_Error(TYPE_ERROR_ATOM, tname, "access_file/2");
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return FALSE;
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} else {
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if (atmode == AtomNone)
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return TRUE;
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if (!Yap_TrueFileName (RepAtom(AtomOfTerm(tname))->StrOfAE, ares, (atmode == AtomCsult)))
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return FALSE;
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}
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#if HAVE_ACCESS
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{
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int mode;
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if (atmode == AtomExist)
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mode = F_OK;
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else if (atmode == AtomWrite)
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mode = W_OK;
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else if (atmode == AtomRead)
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mode = R_OK;
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else if (atmode == AtomAppend)
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mode = W_OK;
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else if (atmode == AtomCsult)
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mode = R_OK;
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else if (atmode == AtomExecute)
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mode = X_OK;
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else {
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PlIOError(DOMAIN_ERROR_IO_MODE, tmode, "access_file/2");
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return FALSE;
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}
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if (access(ares, mode) < 0) {
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/* ignore errors while checking a file */
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return FALSE;
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}
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return TRUE;
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}
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#elif HAVE_STAT
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{
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struct SYSTEM_STAT ss;
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if (SYSTEM_STAT(ares, &ss) != 0) {
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/* ignore errors while checking a file */
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return FALSE;
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}
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return TRUE;
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}
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#else
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return FALSE;
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#endif
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}
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static Int
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exists_directory(USES_REGS1)
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{
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Term tname = Deref(ARG1);
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char *file_name;
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if (IsVarTerm(tname)) {
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Yap_Error(INSTANTIATION_ERROR, tname, "exists_directory/1");
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return FALSE;
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} else if (!IsAtomTerm (tname)) {
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Yap_Error(TYPE_ERROR_ATOM, tname, "exists_directory/1");
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return FALSE;
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} else {
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#if HAVE_STAT
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struct SYSTEM_STAT ss;
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file_name = RepAtom(AtomOfTerm(tname))->StrOfAE;
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if (SYSTEM_STAT(file_name, &ss) != 0) {
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/* ignore errors while checking a file */
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return FALSE;
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}
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return (S_ISDIR(ss.st_mode));
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#else
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return FALSE;
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#endif
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}
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}
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static Int
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is_absolute_file_name ( USES_REGS1 )
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{ /* file_base_name(Stream,N) */
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Term t = Deref(ARG1);
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Atom at;
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if (IsVarTerm(t)) {
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Yap_Error(INSTANTIATION_ERROR, t, "file_base_name/2");
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return FALSE;
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}
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at = AtomOfTerm(t);
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if (IsWideAtom(at)) {
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#if _WIN32
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return PathisRelativeW(RepAtom(at)->WStrOfAE[0]);
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#else
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return RepAtom(at)->WStrOfAE[0] == '/';
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#endif
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} else {
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return Yap_IsAbsolutePath( RepAtom(at)->StrOfAE );
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}
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return false;
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}
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static Int
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file_base_name ( USES_REGS1 )
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{ /* file_base_name(Stream,N) */
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Term t = Deref(ARG1);
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Atom at;
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if (IsVarTerm(t)) {
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Yap_Error(INSTANTIATION_ERROR, t, "file_base_name/2");
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return FALSE;
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}
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at = AtomOfTerm(t);
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if (IsWideAtom(at)) {
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wchar_t *c = RepAtom(at)->WStrOfAE;
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Int i = wcslen(c);
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while (i && !Yap_dir_separator((int)c[--i]));
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return Yap_unify(ARG2, MkAtomTerm(Yap_LookupWideAtom(c+i)));
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} else {
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char *c = RepAtom(at)->StrOfAE;
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char *s;
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#if HAVE_BASENAME
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s = basename( c );
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#else
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Int i = strlen(c);
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while (i && !Yap_dir_separator((int)c[--i]));
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if (Yap_dir_separator((int)c[i])) {
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i++;
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}
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s = c+i;
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#endif
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return Yap_unify(ARG2, MkAtomTerm(Yap_LookupAtom(s)));
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}
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}
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static Int
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file_directory_name ( USES_REGS1 )
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|
{ /* file_directory_name(Stream,N) */
|
|
Term t = Deref(ARG1);
|
|
Atom at;
|
|
if (IsVarTerm(t)) {
|
|
Yap_Error(INSTANTIATION_ERROR, t, "file_directory_name/2");
|
|
return FALSE;
|
|
}
|
|
at = AtomOfTerm(t);
|
|
if (IsWideAtom(at)) {
|
|
wchar_t s[YAP_FILENAME_MAX+1];
|
|
wchar_t *c = RepAtom(at)->WStrOfAE;
|
|
Int i = wcslen(c);
|
|
while (i && !Yap_dir_separator((int)c[--i]));
|
|
if (Yap_dir_separator((int)c[i])) {
|
|
i++;
|
|
}
|
|
wcsncpy(s, c, i);
|
|
return Yap_unify(ARG2, MkAtomTerm(Yap_LookupWideAtom(s)));
|
|
} else {
|
|
char *c = RepAtom(at)->StrOfAE;
|
|
#if HAVE_BASENAME
|
|
char *s;
|
|
s = dirname( c );
|
|
#else
|
|
char *s[YAP_FILENAME_MAX+1];
|
|
Int i = strlen(c);
|
|
while (i && !Yap_dir_separator((int)c[--i]));
|
|
if (Yap_dir_separator((int)c[i])) {
|
|
i++;
|
|
}
|
|
strncpy(s, c, i);
|
|
#endif
|
|
return Yap_unify(ARG2, MkAtomTerm(Yap_LookupAtom(s)));
|
|
}
|
|
}
|
|
|
|
|
|
static Int
|
|
same_file( USES_REGS1 ) {
|
|
char *f1 = RepAtom(AtomOfTerm(Deref(ARG1)))->StrOfAE;
|
|
char *f2 = RepAtom(AtomOfTerm(Deref(ARG2)))->StrOfAE;
|
|
|
|
if (strcmp(f1,f2) == 0)
|
|
return TRUE;
|
|
#if HAVE_LSTAT
|
|
{
|
|
int out;
|
|
struct stat *b1, *b2;
|
|
while ((char *)HR+sizeof(struct stat)*2 > (char *)(ASP-1024)) {
|
|
if (!Yap_gcl(2*sizeof(struct stat), 2, ENV,Yap_gcP() ) ) {
|
|
Yap_Error(OUT_OF_STACK_ERROR, TermNil, LOCAL_ErrorMessage);
|
|
return FALSE;
|
|
}
|
|
}
|
|
b1 = (struct stat *)HR;
|
|
b2 = b1+1;
|
|
if (strcmp(f1,"user_input") == 0) {
|
|
if (fstat(fileno(GLOBAL_Stream[0].file), b1) == -1) {
|
|
/* file does not exist, but was opened? Return -1 */
|
|
return FALSE;
|
|
}
|
|
} else if (strcmp(f1,"user_output") == 0) {
|
|
if (fstat(fileno(GLOBAL_Stream[1].file), b1) == -1) {
|
|
/* file does not exist, but was opened? Return -1 */
|
|
return FALSE;
|
|
}
|
|
} else if (strcmp(f1,"user_error") == 0) {
|
|
if (fstat(fileno(GLOBAL_Stream[2].file), b1) == -1) {
|
|
/* file does not exist, but was opened? Return -1 */
|
|
return FALSE;
|
|
}
|
|
} else if (stat(f1, b1) == -1) {
|
|
/* file does not exist, but was opened? Return -1 */
|
|
return FALSE;
|
|
}
|
|
if (strcmp(f2,"user_input") == 0) {
|
|
if (fstat(fileno(GLOBAL_Stream[0].file), b2) == -1) {
|
|
/* file does not exist, but was opened? Return -1 */
|
|
return FALSE;
|
|
}
|
|
} else if (strcmp(f2,"user_output") == 0) {
|
|
if (fstat(fileno(GLOBAL_Stream[1].file), b2) == -1) {
|
|
/* file does not exist, but was opened? Return -1 */
|
|
return FALSE;
|
|
}
|
|
} else if (strcmp(f2,"user_error") == 0) {
|
|
if (fstat(fileno(GLOBAL_Stream[2].file), b2) == -1) {
|
|
/* file does not exist, but was opened? Return -1 */
|
|
return FALSE;
|
|
}
|
|
} else if (stat(f2, b2) == -1) {
|
|
/* file does not exist, but was opened? Return -1 */
|
|
return FALSE;
|
|
}
|
|
out = (b1->st_ino == b2->st_ino
|
|
#ifdef __LCC__
|
|
&& memcmp((const void *)&(b1->st_dev),(const void *)&(b2->st_dev),sizeof(buf1.st_dev)) == 0
|
|
#else
|
|
&& b1->st_dev == b2->st_dev
|
|
#endif
|
|
);
|
|
return out;
|
|
}
|
|
#else
|
|
return(FALSE);
|
|
#endif
|
|
}
|
|
|
|
|
|
void
|
|
Yap_InitFiles( void )
|
|
{
|
|
Yap_InitCPred ("file_base_name", 2, file_base_name, SafePredFlag);
|
|
Yap_InitCPred ("file_directory_name", 2, file_directory_name, SafePredFlag);
|
|
Yap_InitCPred ("is_absolute_file_name", 1, is_absolute_file_name, SafePredFlag);
|
|
Yap_InitCPred ("same_file", 2, same_file, SafePredFlag|SyncPredFlag);
|
|
Yap_InitCPred ("access_file", 2, access_file, SafePredFlag|SyncPredFlag);
|
|
Yap_InitCPred ("access", 1, access_path, SafePredFlag|SyncPredFlag);
|
|
Yap_InitCPred ("exists_directory", 1, exists_directory, SafePredFlag|SyncPredFlag);
|
|
Yap_InitCPred ("exists_file", 1, exists_file, SafePredFlag|SyncPredFlag);
|
|
Yap_InitCPred ("time_file64", 2, time_file, SafePredFlag|SyncPredFlag);
|
|
Yap_InitCPred ("time_file", 2, time_file, SafePredFlag|SyncPredFlag);
|
|
Yap_InitCPred ("file_size", 2,file_size, SafePredFlag|SyncPredFlag);
|
|
Yap_InitCPred ("file_name_extension", 3, file_name_extension, SafePredFlag|SyncPredFlag);
|
|
}
|
|
|