650 lines
17 KiB
C
650 lines
17 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 "sysbits.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 file_name_extension(USES_REGS1) {
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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)
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pts = pts1;
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#endif
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char *ss = strrchr(f, '.');
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if (pts > ss)
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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) && 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 access_path(USES_REGS1) {
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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 exists_file(USES_REGS1) {
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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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#if _MSC_VER
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return ss.st_mode & S_IFREG;
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#else
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return S_ISREG(ss.st_mode);
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#endif
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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 file_exists(USES_REGS1) {
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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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if (errno == ENOENT)
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return false;
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PlIOError(SYSTEM_ERROR_OPERATING_SYSTEM, tname, "error %s",
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strerror(errno));
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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 time_file(USES_REGS1) {
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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 ft;
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HANDLE hdl;
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Term rc;
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if ((hdl = CreateFile(n, 0, 0, NULL, OPEN_EXISTING, 0, 0)) == 0)
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return false;
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if (GetFileTime(hdl, NULL, NULL, &ft))
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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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ULONGLONG qwResult;
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// Copy the time into a quadword.
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qwResult = (((ULONGLONG)ft.dwHighDateTime) << 32) + ft.dwLowDateTime;
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#if SIZEOF_INT_P == 8
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rc = MkIntegerTerm(qwResult);
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#elif USE_GMP
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char s[64];
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MP_INT rop;
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snprintf(s, 64, "%I64d", (long long int)n);
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mpz_init_set_str(&rop, s, 10);
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rc = Yap_MkBigIntTerm((void *)&rop) PASS_REGS);
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#else
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rc = MkIntegerTerm(ft.dwHighDateTime);
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#endif
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return Yap_unify(ARG2, rc);
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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 file_size(USES_REGS1) {
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int rc;
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Int sno = Yap_CheckStream(
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ARG1, (Input_Stream_f | Output_Stream_f | Socket_Stream_f),
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"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 &
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(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 ((rc = fstat(fileno(GLOBAL_Stream[sno].file), &file_stat)) < 0) {
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UNLOCK(GLOBAL_Stream[sno].streamlock);
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if (rc == ENOENT)
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PlIOError(EXISTENCE_ERROR_SOURCE_SINK, ARG1, "%s in file_size",
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strerror(errno));
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else
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PlIOError(PERMISSION_ERROR_INPUT_STREAM, ARG1, "%s in file_size",
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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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static Int access_file(USES_REGS1) {
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Term tname = Deref(ARG1);
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Term tmode = Deref(ARG2);
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char *ares;
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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 (!(ares = RepAtom(AtomOfTerm(tname))->StrOfAE))
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return FALSE;
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}
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#if HAVE_ACCESS
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#if _WIN32
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{
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int mode;
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if (atmode == AtomExist)
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mode = 00;
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else if (atmode == AtomWrite)
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mode = 02;
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else if (atmode == AtomRead)
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mode = 04;
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else if (atmode == AtomAppend)
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mode = 03;
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else if (atmode == AtomCsult)
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mode = 04;
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else if (atmode == AtomExecute)
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mode = 00; // can always execute?
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else {
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Yap_Error(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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#else
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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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Yap_Error(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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#endif
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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 exists_directory(USES_REGS1) {
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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 is_absolute_file_name(USES_REGS1) { /* 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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const char *buf = Yap_TextTermToText(t, NULL, 0);
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if (buf) {
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return Yap_IsAbsolutePath(buf);
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} else {
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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);
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#else
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return RepAtom(at)->WStrOfAE[0] == '/';
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#endif
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}
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}
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return false;
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}
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static Int file_base_name(USES_REGS1) { /* 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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;
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return Yap_unify(ARG2, MkAtomTerm(Yap_LookupWideAtom(c + i)));
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} else {
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const char *c = RepAtom(at)->StrOfAE;
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const char *s;
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#if HAVE_BASENAME && 0 // DISABLED: Linux basename is not compatible with
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// file_base_name in SWI and GNU
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char c1[YAP_FILENAME_MAX + 1];
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strncpy(c1, c, YAP_FILENAME_MAX);
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s = basename(c1);
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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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;
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if (Yap_dir_separator((int)c[i])) {
|
|
i++;
|
|
}
|
|
s = c + i;
|
|
#endif
|
|
return Yap_unify(ARG2, MkAtomTerm(Yap_LookupAtom(s)));
|
|
}
|
|
}
|
|
|
|
static Int file_directory_name(USES_REGS1) { /* 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 {
|
|
const char *c = RepAtom(at)->StrOfAE;
|
|
#if HAVE_BASENAME && 0 // DISABLED: Linux basename is not compatible with
|
|
// file_base_name in SWI and GNU
|
|
const char *s;
|
|
char c1[YAP_FILENAME_MAX + 1];
|
|
strncpy(c1, c, YAP_FILENAME_MAX);
|
|
s = dirname(c1);
|
|
#else
|
|
char s[YAP_FILENAME_MAX + 1];
|
|
Int i = strlen(c);
|
|
while (i && !Yap_dir_separator((int)c[--i]))
|
|
;
|
|
strncpy(s, c, i);
|
|
s[i] = '\0';
|
|
#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(RESOURCE_ERROR_STACK, 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("$access_file", 2, access_file, SafePredFlag | SyncPredFlag);
|
|
Yap_InitCPred("access", 1, access_path, SafePredFlag | SyncPredFlag);
|
|
Yap_InitCPred("exists_directory", 1, exists_directory,
|
|
SafePredFlag | SyncPredFlag);
|
|
Yap_InitCPred("exists_file", 1, exists_file, SafePredFlag | SyncPredFlag);
|
|
Yap_InitCPred("$file_exists", 1, file_exists, 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);
|
|
}
|