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df8b264751
yap-6.3/os/sysbits.c
Vitor Santos Costa 304489c74f warnings and stream read wchar simplification
2016-08-01 19:17:56 -05:00

2102 lines
53 KiB
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: sysbits.c *
* Last rev: 4/03/88 *
* mods: *
* comments: very much machine dependent routines *
* *
*************************************************************************/
#ifdef SCCS
static char SccsId[] = "%W% %G%";
#endif
#include "sysbits.h"
/// File Error Handler
static void FileError(yap_error_number type, Term where, const char *format,
...) {
if (trueLocalPrologFlag(FILEERRORS_FLAG)) {
va_list ap;
va_start(ap, format);
/* now build the error string */
Yap_Error(type, TermNil, format, ap);
va_end(ap);
}
}
/// Allocate a temporary buffer
static char *getFileNameBuffer(void) {
return Yap_AllocAtomSpace(YAP_FILENAME_MAX);
}
static void freeFileNameBuffer(char *s) { Yap_FreeCodeSpace(s); }
static Int p_sh(USES_REGS1);
static Int p_shell(USES_REGS1);
static Int p_system(USES_REGS1);
static Int p_mv(USES_REGS1);
static Int p_dir_sp(USES_REGS1);
static Int p_getenv(USES_REGS1);
static Int p_putenv(USES_REGS1);
static Term do_glob(const char *spec, bool ok_to);
#ifdef MACYAP
static int chdir(char *);
/* #define signal skel_signal */
#endif /* MACYAP */
static const char *expandVars(const char *spec, char *u);
void exit(int);
#ifdef _WIN32
void Yap_WinError(char *yap_error) {
char msg[256];
/* Error, we could not read time */
FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
NULL, GetLastError(), MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
msg, 256, NULL);
Yap_Error(SYSTEM_ERROR_OPERATING_SYSTEM, TermNil, "%s at %s", msg, yap_error);
}
#endif /* __WINDOWS__ */
#define is_valid_env_char(C) \
(((C) >= 'a' && (C) <= 'z') || ((C) >= 'A' && (C) <= 'Z') || (C) == '_')
/// is_directory: verifies whether an expanded file name
/// points at a readable directory
static bool is_directory(const char *FileName) {
VFS_t *vfs;
if ((vfs = vfs_owner(FileName))) {
return vfs->isdir(vfs, FileName);
}
#ifdef __WINDOWS__
DWORD dwAtts = GetFileAttributes(FileName);
if (dwAtts == INVALID_FILE_ATTRIBUTES)
return false;
return (dwAtts & FILE_ATTRIBUTE_DIRECTORY);
#elif HAVE_LSTAT
struct stat buf;
if (lstat(FileName, &buf) == -1) {
/* return an error number */
return false;
}
return S_ISDIR(buf.st_mode);
#else
Yap_Error(SYSTEM_ERROR_INTERNAL, TermNil,
"stat not available in this configuration");
return false;
#endif
}
bool Yap_Exists(const char *f) {
VFS_t *vfs;
if ((vfs = vfs_owner(f))) {
return vfs->exists(vfs, f);
}
#if _WIN32
if (_access(f, 0) == 0)
return true;
if (errno == EINVAL) {
Yap_Error(SYSTEM_ERROR_INTERNAL, TermNil, "bad flags to access");
}
return false;
#elif HAVE_ACCESS
if (access(f, F_OK) == 0)
return true;
if (errno == EINVAL) {
Yap_Error(SYSTEM_ERROR_INTERNAL, TermNil, "bad flags to access");
}
return false;
#else
Yap_Error(SYSTEM_ERROR_INTERNAL, TermNil,
"access not available in this configuration");
return false;
#endif
}
static int dir_separator(int ch) {
#ifdef MAC
return (ch == ':');
#elif ATARI || _MSC_VER
return (ch == '\\');
#elif defined(__MINGW32__) || defined(__CYGWIN__)
return (ch == '\\' || ch == '/');
#else
return (ch == '/');
#endif
}
int Yap_dir_separator(int ch) { return dir_separator(ch); }
#if __WINDOWS__
#include <psapi.h>
char *libdir = NULL;
#endif
bool Yap_IsAbsolutePath(const char *p0) {
// verify first if expansion is needed: ~/ or $HOME/
const char *p = expandVars(p0, LOCAL_FileNameBuf);
bool nrc;
#if _WIN32 || __MINGW32__
nrc = !PathIsRelative(p);
#else
nrc = (p[0] == '/');
#endif
return nrc;
}
#define isValidEnvChar(C) \
(((C) >= 'a' && (C) <= 'z') || ((C) >= 'A' && (C) <= 'Z') || (C) == '_')
// this is necessary because
// support for ~expansion at the beginning
// systems like Android do not do this.
static const char *PlExpandVars(const char *source, const char *root,
char *result) {
CACHE_REGS
const char *src = source;
if (!result)
result = malloc(YAP_FILENAME_MAX + 1);
if (strlen(source) >= YAP_FILENAME_MAX) {
Yap_Error(SYSTEM_ERROR_OPERATING_SYSTEM, TermNil,
"%s in true_file-name is larger than the buffer size (%d bytes)",
source, strlen(source));
}
/* step 1: eating home information */
if (source[0] == '~') {
if (dir_separator(source[1]) || source[1] == '\0') {
char *s;
src++;
#if defined(_WIN32)
s = getenv("HOMEDRIVE");
if (s != NULL)
strncpy(result, getenv("HOMEDRIVE"), YAP_FILENAME_MAX);
// s = getenv("HOMEPATH");
#else
s = getenv("HOME");
#endif
if (s != NULL)
strncpy(result, s, YAP_FILENAME_MAX);
strcat(result, src);
return result;
} else {
#if HAVE_GETPWNAM
struct passwd *user_passwd;
char *res = result;
src++;
while (!dir_separator((*res = *src)) && *res != '\0')
res++, src++;
res[0] = '\0';
if ((user_passwd = getpwnam(result)) == NULL) {
FileError(SYSTEM_ERROR_OPERATING_SYSTEM,
MkAtomTerm(Yap_LookupAtom(source)),
"User %s does not exist in %s", result, source);
return NULL;
}
strncpy(result, user_passwd->pw_dir, YAP_FILENAME_MAX);
strcat(result, src);
#else
FileError(
SYSTEM_ERROR_OPERATING_SYSTEM, MkAtomTerm(Yap_LookupAtom(source)),
"User %s cannot be found in %s, missing getpwnam", result, source);
return NULL;
#endif
}
return result;
}
// do VARIABLE expansion
else if (source[0] == '$') {
/* follow SICStus expansion rules */
char v[YAP_FILENAME_MAX + 1];
int ch;
char *s, *res;
src = source + 1;
if (src[0] == '{') {
res = v;
src++;
while ((*res = (ch = *src++)) && isValidEnvChar(ch) && ch != '}') {
res++;
}
if (ch == '}') {
// {...}
// done
res[0] = '\0';
}
} else {
res = v;
while ((*res = (ch = *src++)) && isValidEnvChar(ch) && ch != '}') {
res++;
}
src--;
res[0] = '\0';
}
if ((s = (char *)getenv(v))) {
strcpy(result, s);
strcat(result, src);
} else
strcpy(result, src);
} else {
size_t tocp = strlen(src);
if (root) {
tocp = strlen(root) + 1;
}
if (tocp > YAP_FILENAME_MAX) {
Yap_Error(SYSTEM_ERROR_OPERATING_SYSTEM, MkStringTerm(src),
"path too long");
return NULL;
}
if (root && !Yap_IsAbsolutePath(source)) {
strncpy(result, root, YAP_FILENAME_MAX);
if (root[strlen(root) - 1] != '/')
strncat(result, "/", YAP_FILENAME_MAX);
strncat(result, source, YAP_FILENAME_MAX);
} else {
strncpy(result, source, strlen(src) + 1);
}
}
return result;
}
#if _WIN32
// straightforward conversion from Unix style to WIN style
// check cygwin path.cc for possible improvements
static char *unix2win(const char *source, char *target, int max) {
char *s = target;
const char *s0 = source;
char *s1;
int ch;
if (s == NULL)
s = malloc(YAP_FILENAME_MAX + 1);
s1 = s;
// win32 syntax
// handle drive notation, eg //a/
if (s0[0] == '\0') {
s[0] = '.';
s[1] = '\0';
return s;
}
if (s0[0] == '/' && s0[1] == '/' && isalpha(s0[2]) && s0[3] == '/') {
s1[0] = s0[2];
s1[1] = ':';
s1[2] = '\\';
s0 += 4;
s1 += 3;
}
while ((ch = *s1++ = *s0++)) {
if (ch == '$') {
s1[-1] = '%';
ch = *s0;
// handle $(....)
if (ch == '{') {
s0++;
while ((ch = *s0++) != '}') {
*s1++ = ch;
if (ch == '\0')
return FALSE;
}
*s1++ = '%';
} else {
while (((ch = *s1++ = *s0++) >= 'A' && ch <= 'Z') ||
(ch >= 'a' && ch <= 'z') || (ch == '-') ||
(ch >= '0' && ch <= '9') || (ch == '_'))
;
s1[-1] = '%';
*s1++ = ch;
if (ch == '\0') {
s1--;
s0--;
}
}
} else if (ch == '/')
s1[-1] = '\\';
}
return s;
}
#endif
static char *OsPath(const char *p, char *buf) { return (char *)p; }
static char *PrologPath(const char *Y, char *X) { return (char *)Y; }
#if _WIN32
#define HAVE_BASENAME 1
#define HAVE_REALPATH 1
#endif
static bool ChDir(const char *path) {
bool rc = false;
char qp[FILENAME_MAX + 1];
const char *qpath = Yap_AbsoluteFile(path, qp, true);
VFS_t *v;
if ((v = vfs_owner(path))) {
return v->chdir(v, path);
}
#if _WIN32
rc = true;
if (qpath != NULL && qpath[0] &&
(rc = (SetCurrentDirectory(qpath) != 0)) == 0) {
Yap_WinError("SetCurrentDirectory failed");
}
#else
rc = (chdir(qpath) == 0);
#endif
if (qpath != qp && qpath != path && qpath != LOCAL_FileNameBuf &&
qpath != LOCAL_FileNameBuf2)
free((char *)qpath);
return rc;
}
static const char *myrealpath(const char *path, char *out) {
if (!out)
out = LOCAL_FileNameBuf;
#if _WIN32
DWORD retval = 0;
// notice that the file does not need to exist
retval = GetFullPathName(path, YAP_FILENAME_MAX, out, NULL);
if (retval == 0) {
Yap_WinError("Generating a full path name for a file");
return NULL;
}
return out;
#elif HAVE_REALPATH
{
char *rc = realpath(path, NULL);
if (rc) {
return rc;
}
// rc = NULL;
if (errno == ENOENT || errno == EACCES) {
char base[YAP_FILENAME_MAX + 1];
strncpy(base, path, YAP_FILENAME_MAX - 1);
rc = realpath(dirname(base), out);
if (rc) {
// base may haave been destroyed
const char *b = basename((char *)path);
size_t e = strlen(rc);
size_t bs = strlen(b);
if (rc != out && rc != base) {
rc = realloc(rc, e + bs + 2);
}
#if _WIN32
if (rc[e - 1] != '\\' && rc[e - 1] != '/') {
rc[e] = '\\';
rc[e + 1] = '\0';
}
#else
if (rc[e - 1] != '/') {
rc[e] = '/';
rc[e + 1] = '\0';
}
#endif
strcat(rc, b);
return rc;
}
}
}
#endif
out = malloc(strlen(path) + 1);
strcpy(out, path);
return out;
}
static const char *expandVars(const char *spec, char *u) {
CACHE_REGS
#if _WIN32 || defined(__MINGW32__)
char *out;
// first pass, remove Unix style stuff
if ((out = unix2win(spec, u, YAP_FILENAME_MAX)) == NULL)
return NULL;
spec = u;
#endif
bool ok_to = LOCAL_PrologMode && !(LOCAL_PrologMode & BootMode);
if (ok_to) {
Term t = do_glob(spec, true);
if (IsPairTerm(t))
return RepAtom(AtomOfTerm(HeadOfTerm(t)))->StrOfAE;
return NULL;
}
return spec;
}
/**
* generate absolute path, if ok first expand SICStus Prolog style
*
* @param[in] spec the file path, including `~` and `$`.
* @param[in] ok where to process `~` and `$`.
*
* @return tmp, or NULL, in malloced memory
*/
const char *Yap_AbsoluteFile(const char *spec, char *rc0, bool ok) {
const char *rc;
const char *spec1;
const char *spec2;
char rc1[YAP_FILENAME_MAX + 1];
/// spec gothe original spec;
/// rc0 may be an outout buffer
/// rc1 the internal buffer
///
/// PlExpandVars
#if _WIN32
char rc2[YAP_FILENAME_MAX];
if ((rc = unix2win(spec, rc2, YAP_FILENAME_MAX)) == NULL) {
return NULL;
}
spec1 = rc;
#else
spec1 = spec;
#endif
/// spec gothe original spec;
/// rc1 the internal buffer
if (ok) {
const char *q = PlExpandVars(spec1, NULL, rc1);
if (!q)
spec2 = spec1;
else
spec2 = q;
} else {
spec2 = spec1;
}
rc = myrealpath(spec2, rc0);
return rc;
}
static Term
/* Expand the string for the program to run. */
do_glob(const char *spec, bool glob_vs_wordexp) {
CACHE_REGS
if (spec == NULL) {
return TermNil;
}
#if _WIN32
char u[YAP_FILENAME_MAX + 1];
{
WIN32_FIND_DATA find;
HANDLE hFind;
CELL *dest;
Term tf;
char drive[_MAX_DRIVE];
char dir[_MAX_DIR];
char fname[_MAX_FNAME];
char ext[_MAX_EXT];
_splitpath(spec, drive, dir, fname, ext);
_makepath(u, drive, dir, fname, ext);
// first pass, remove Unix style stuff
hFind = FindFirstFile(u, &find);
if (hFind == INVALID_HANDLE_VALUE) {
return TermNil;
} else {
tf = AbsPair(HR);
_makepath(u, drive, dir, find.cFileName, NULL);
HR[0] = MkAtomTerm(Yap_LookupAtom(u));
HR[1] = TermNil;
dest = HR + 1;
HR += 2;
while (FindNextFile(hFind, &find)) {
*dest = AbsPair(HR);
_makepath(u, drive, dir, find.cFileName, NULL);
HR[0] = MkAtomTerm(Yap_LookupAtom(u));
HR[1] = TermNil;
dest = HR + 1;
HR += 2;
}
FindClose(hFind);
}
return tf;
}
#elif HAVE_WORDEXP || HAVE_GLOB
char u[YAP_FILENAME_MAX + 1];
const char *espec = u;
strncpy(u, spec, sizeof(u));
/* Expand the string for the program to run. */
size_t pathcount;
#if HAVE_GLOB
glob_t gresult;
#endif
#if HAVE_WORDEXP
wordexp_t wresult;
#endif
#if HAVE_GLOB || HAVE_WORDEXP
char **ss = NULL;
int flags = 0, j;
#endif
if (glob_vs_wordexp) {
#if HAVE_GLOB
#ifdef GLOB_NOCHECK
flags = GLOB_NOCHECK;
#else
flags = 0;
#endif
#ifdef GLOB_BRACE
flags |= GLOB_BRACE | GLOB_TILDE;
#endif
switch (glob(espec, flags, NULL, &gresult)) {
case 0: /* Successful. */
ss = gresult.gl_pathv;
pathcount = gresult.gl_pathc;
if (pathcount) {
break;
}
case GLOB_NOMATCH:
globfree(&gresult);
{ return TermNil; }
case GLOB_ABORTED:
PlIOError(SYSTEM_ERROR_OPERATING_SYSTEM, ARG1, "glob aborted: %sn",
strerror(errno));
globfree(&gresult);
return TermNil;
case GLOB_NOSPACE:
Yap_Error(RESOURCE_ERROR_HEAP, ARG1, "glob ran out of space: %sn",
strerror(errno));
globfree(&gresult);
return TermNil;
/* If the error was WRDE_NOSPACE,
then perhaps part of the result was allocated. */
default: /* Some other error. */
return TermNil;
}
#endif
} else {
#if HAVE_WORDEXP
int rc;
memset(&wresult, 0, sizeof(wresult));
switch ((rc = wordexp(espec, &wresult, flags))) {
case 0: /* Successful. */
ss = wresult.we_wordv;
pathcount = wresult.we_wordc;
if (pathcount) {
break;
} else {
Term t;
t = MkAtomTerm(Yap_LookupAtom(expandVars(espec, NULL)));
wordfree(&wresult);
return MkPairTerm(t, TermNil);
}
case WRDE_NOSPACE:
/* If the error was WRDE_NOSPACE,
then perhaps part of the result was allocated. */
Yap_Error(RESOURCE_ERROR_HEAP, ARG1, "wordexp ran out of space: %s",
strerror(errno));
wordfree(&wresult);
return TermNil;
default: /* Some other error. */
PlIOError(SYSTEM_ERROR_OPERATING_SYSTEM, ARG1, "wordexp failed: %s",
strerror(errno));
wordfree(&wresult);
return TermNil;
}
#endif
}
const char *tmp;
Term tf = TermNil;
for (j = 0; j < pathcount; j++) {
const char *s = ss[pathcount - (j + 1)];
tmp = s;
// if (!exists(s))
// continue;
Atom a = Yap_LookupAtom(tmp);
tf = MkPairTerm(MkAtomTerm(a), tf);
}
#if HAVE_GLOB
if (glob_vs_wordexp)
globfree(&gresult);
#endif
#if HAVE_WORDEXP
if (!glob_vs_wordexp)
wordfree(&wresult);
#endif
return tf;
#else
// just use basic
return MkPairTerm(MkAtomTerm(Yap_LookupAtom(spec)), TermNil);
#endif
}
/**
* @pred prolog_expanded_file_system_path( +PrologPath, +ExpandVars, -OSPath )
*
* Apply basic transformations to paths, and conidtionally apply
* traditional SICStus-style variable expansion.
*
* @param PrologPath the source, may be atom or string
* @param ExpandVars expand initial occurrence of ~ or $
* @param Prefix add this path before _PrologPath_
* @param OSPath pathname.
*
* @return
*/
static Int real_path(USES_REGS1) {
Term t1 = Deref(ARG1);
const char *cmd, *rc0;
if (IsAtomTerm(t1)) {
cmd = RepAtom(AtomOfTerm(t1))->StrOfAE;
} else if (IsStringTerm(t1)) {
cmd = StringOfTerm(t1);
} else {
return false;
}
#if _WIN32
char cmd2[YAP_FILENAME_MAX + 1];
char *rc;
if ((rc = unix2win(cmd, cmd2, YAP_FILENAME_MAX)) == NULL) {
return false;
}
cmd = rc;
#endif
rc0 = myrealpath(cmd, NULL);
if (!rc0) {
PlIOError(SYSTEM_ERROR_OPERATING_SYSTEM, ARG1, NULL);
}
bool out = Yap_unify(MkAtomTerm(Yap_LookupAtom(rc0)), ARG2);
freeBuffer(rc0);
return out;
}
#define EXPAND_FILENAME_DEFS() \
PAR("parameter_expansion", isatom, EXPAND_FILENAME_PARAMETER_EXPANSION) \
, PAR("commands", booleanFlag, EXPAND_FILENAME_COMMANDS), \
PAR(NULL, ok, EXPAND_FILENAME_END)
#define PAR(x, y, z) z
typedef enum expand_filename_enum_choices {
EXPAND_FILENAME_DEFS()
} expand_filename_enum_choices_t;
#undef PAR
#define PAR(x, y, z) \
{ x, y, z }
static const param_t expand_filename_defs[] = {EXPAND_FILENAME_DEFS()};
#undef PAR
static Term do_expand_file_name(Term t1, Term opts USES_REGS) {
xarg *args;
expand_filename_enum_choices_t i;
bool use_system_expansion = true;
const char *tmpe = NULL;
const char *spec;
Term tf;
if (IsVarTerm(t1)) {
Yap_Error(INSTANTIATION_ERROR, t1, NULL);
return TermNil;
} else if (IsAtomTerm(t1)) {
spec = AtomTermName(t1);
} else if (IsStringTerm(t1)) {
spec = StringOfTerm(t1);
} else {
Yap_Error(TYPE_ERROR_ATOM, t1, NULL);
return TermNil;
}
#if _WIN32
char *rc;
char cmd2[YAP_FILENAME_MAX + 1];
if ((rc = unix2win(spec, cmd2, YAP_FILENAME_MAX)) == NULL) {
return false;
}
spec = rc;
#endif
args = Yap_ArgListToVector(opts, expand_filename_defs, EXPAND_FILENAME_END);
if (args == NULL) {
return TermNil;
}
tmpe = NULL;
for (i = 0; i < EXPAND_FILENAME_END; i++) {
if (args[i].used) {
Term t = args[i].tvalue;
switch (i) {
case EXPAND_FILENAME_PARAMETER_EXPANSION:
if (t == TermProlog) {
tmpe = expandVars(spec, LOCAL_FileNameBuf);
if (tmpe == NULL) {
free(args);
return TermNil;
}
spec = tmpe;
} else if (t == TermTrue) {
use_system_expansion = true;
} else if (t == TermFalse) {
use_system_expansion = false;
}
break;
case EXPAND_FILENAME_COMMANDS:
if (!use_system_expansion) {
use_system_expansion = true;
#if 0 // def WRDE_NOCMD
if (t == TermFalse) {
flags = WRDE_NOCMD;
}
#endif
}
case EXPAND_FILENAME_END:
break;
}
}
}
free(args);
if (!use_system_expansion) {
const char *o = expandVars(spec, NULL);
if (!o)
return false;
tf = MkPairTerm(MkAtomTerm(Yap_LookupAtom(o)), TermNil);
#if _WIN32
if (o != cmd2)
#endif
{
freeBuffer(o);
}
} else {
tf = do_glob(spec, true);
}
if (tmpe
#if _WIN32
&& tmpe != cmd2
#endif
) {
freeBuffer(tmpe);
}
return tf;
}
/* @pred expand_file_name( +Pattern, -ListOfPaths) is det
This builtin receives a pattern and expands it into a list of files.
In Unix-like systems, YAP applies glob to expand patterns such as '*', '.',
and '?'. Further variable expansion
may also happen. glob is shell-dependent: som Yap_InitCPred
("absolute_file_system_path", 2, absolute_file_system_path, 0);
Yap_InitCPred ("real_path", 2, prolog_realpath, 0);
Yap_InitCPred ("true_file_name", 2,
true_file_name, SyncPredFlag);
Yap_InitCPred ("true_file_name", 3, true_file_name3, SyncPredFlag);
e shells allow command execution and brace-expansion.
*/
static Int expand_file_name(USES_REGS1) {
Term tf = do_expand_file_name(Deref(ARG1), TermNil PASS_REGS);
if (tf == 0)
return false;
return Yap_unify(tf, ARG2);
}
static Int expand_file_name3(USES_REGS1) {
Term tf = do_expand_file_name(Deref(ARG1), Deref(ARG2) PASS_REGS);
return Yap_unify(tf, ARG3);
}
/*
static char *canoniseFileName( char *path) {
#if HAVE_REALPATH && HAVE_BASENAME
#if _WIN32 || defined(__MINGW32__)
char *o = malloc(YAP_FILENAME_MAX+1);
if (!o)
return NULL;
// first pass, remove Unix style stuff
if (unix2win(path, o, YAP_FILENAME_MAX) == NULL)
return NULL;
path = o;
#endif
char *rc;
if (tmp == NULL) return NULL;
rc = myrealpath(path);
#if _WIN32 || defined(__MINGW32__)
freeBuffer(o);
#endif
return rc;
#endif
}
*/
static Int absolute_file_system_path(USES_REGS1) {
Term t = Deref(ARG1);
const char *fp;
bool rc;
char s[MAXPATHLEN + 1];
const char *text = Yap_TextTermToText(t, s, MAXPATHLEN, LOCAL_encoding);
if (text == NULL) {
return false;
}
if (!(fp = Yap_AbsoluteFile(RepAtom(AtomOfTerm(t))->StrOfAE, NULL, true)))
return false;
rc = Yap_unify(Yap_MkTextTerm(fp, LOCAL_encoding, t), ARG2);
if (fp != s)
freeBuffer((void *)fp);
return rc;
}
static Int prolog_to_os_filename(USES_REGS1) {
Term t = Deref(ARG1), t2 = Deref(ARG2);
char *fp;
char out[MAXPATHLEN + 1];
if (IsVarTerm(t)) {
if (IsVarTerm(t2)) {
Yap_Error(INSTANTIATION_ERROR, t, "prolog_to_os_filename");
return false;
} else if (IsAtomTerm(t2)) {
if (!(fp = PrologPath(RepAtom(AtomOfTerm(t2))->StrOfAE, out)))
return false;
return Yap_unify(ARG1, MkAtomTerm(Yap_LookupAtom(fp)));
} else {
Yap_Error(TYPE_ERROR_ATOM, t2, "prolog_to_os_filename");
return false;
}
} else if (!IsAtomTerm(t)) {
Yap_Error(TYPE_ERROR_ATOM, t, "prolog_to_os_filename");
return false;
}
if (!(fp = OsPath(RepAtom(AtomOfTerm(t))->StrOfAE, out)))
return false;
return Yap_unify(MkAtomTerm(Yap_LookupAtom(fp)), ARG2);
}
Atom Yap_TemporaryFile(const char *prefix, int *fd) {
#if HAVE_MKSTEMP
char *tmp = malloc(PATH_MAX);
int n;
int f;
if (tmp == NULL)
return NIL;
strncpy(tmp, prefix, PATH_MAX - 1);
n = strlen(tmp);
if (n >= 6 && tmp[n - 1] == 'X' && tmp[n - 2] == 'X' && tmp[n - 3] == 'X' &&
tmp[n - 4] == 'X' && tmp[n - 5] == 'X' && tmp[n - 6] == 'X')
f = mkstemp(tmp);
else {
strncat(tmp, "XXXXXX", PATH_MAX - 1);
f = mkstemp(tmp);
}
if (fd)
*fd = f;
return Yap_LookupAtom(tmp);
#else
return AtomNil;
#endif
}
/** @pred make_directory(+ _Dir_)
Create a directory _Dir_. The name of the directory must be an atom.
*/
static Int make_directory(USES_REGS1) {
const char *fd = AtomName(AtomOfTerm(ARG1));
#if defined(__MINGW32__) || _MSC_VER
if (_mkdir(fd) == -1) {
#else
if (mkdir(fd, 0777) == -1) {
#endif
/* return an error number */
return false; // errno?
}
return true;
}
static Int p_rmdir(USES_REGS1) {
const char *fd = AtomName(AtomOfTerm(ARG1));
#if defined(__MINGW32__) || _MSC_VER
if (_rmdir(fd) == -1) {
#else
if (rmdir(fd) == -1) {
#endif
/* return an error number */
return (Yap_unify(ARG2, MkIntTerm(errno)));
}
return true;
}
static bool initSysPath(Term tlib, Term tcommons, bool dir_done,
bool commons_done) {
CACHE_REGS
int len;
#if __WINDOWS__
{
char *dir;
if ((dir = Yap_RegistryGetString("library")) && is_directory(dir)) {
if (!Yap_unify(tlib, MkAtomTerm(Yap_LookupAtom(dir))))
return FALSE;
}
dir_done = true;
if ((dir = Yap_RegistryGetString("prolog_commons")) && is_directory(dir)) {
if (!Yap_unify(tcommons, MkAtomTerm(Yap_LookupAtom(dir))))
return FALSE;
}
commons_done = true;
}
if (dir_done && commons_done)
return TRUE;
#endif
strncpy(LOCAL_FileNameBuf, YAP_SHAREDIR, YAP_FILENAME_MAX);
strncat(LOCAL_FileNameBuf, "/", YAP_FILENAME_MAX);
len = strlen(LOCAL_FileNameBuf);
if (!dir_done) {
strncat(LOCAL_FileNameBuf, "Yap", YAP_FILENAME_MAX);
if (is_directory(LOCAL_FileNameBuf)) {
if (!Yap_unify(tlib, MkAtomTerm(Yap_LookupAtom(LOCAL_FileNameBuf))))
return FALSE;
dir_done = true;
}
}
if (!commons_done) {
LOCAL_FileNameBuf[len] = '\0';
strncat(LOCAL_FileNameBuf, "PrologCommons", YAP_FILENAME_MAX);
if (is_directory(LOCAL_FileNameBuf)) {
if (!Yap_unify(tcommons, MkAtomTerm(Yap_LookupAtom(LOCAL_FileNameBuf))))
return FALSE;
}
commons_done = true;
}
if (dir_done && commons_done)
return TRUE;
#if __WINDOWS__
{
size_t buflen;
char *pt;
/* couldn't find it where it was supposed to be,
let's try using the executable */
if (!GetModuleFileName(NULL, LOCAL_FileNameBuf, YAP_FILENAME_MAX)) {
Yap_WinError("could not find executable name");
/* do nothing */
return FALSE;
}
buflen = strlen(LOCAL_FileNameBuf);
pt = LOCAL_FileNameBuf + buflen;
while (*--pt != '\\') {
/* skip executable */
if (pt == LOCAL_FileNameBuf) {
FileError(SYSTEM_ERROR_OPERATING_SYSTEM, TermNil,
"could not find executable name");
/* do nothing */
return FALSE;
}
}
while (*--pt != '\\') {
/* skip parent directory "bin\\" */
if (pt == LOCAL_FileNameBuf) {
FileError(SYSTEM_ERROR_OPERATING_SYSTEM, TermNil,
"could not find executable name");
/* do nothing */
return FALSE;
}
}
/* now, this is a possible location for the ROOT_DIR, let's look for a share
* directory here */
pt[1] = '\0';
/* grosse */
strncat(LOCAL_FileNameBuf, "lib\\Yap", YAP_FILENAME_MAX);
libdir = Yap_AllocCodeSpace(strlen(LOCAL_FileNameBuf) + 1);
strncpy(libdir, LOCAL_FileNameBuf, strlen(LOCAL_FileNameBuf) + 1);
pt[1] = '\0';
strncat(LOCAL_FileNameBuf, "share", YAP_FILENAME_MAX);
}
strncat(LOCAL_FileNameBuf, "\\", YAP_FILENAME_MAX);
len = strlen(LOCAL_FileNameBuf);
strncat(LOCAL_FileNameBuf, "Yap", YAP_FILENAME_MAX);
if (!dir_done && is_directory(LOCAL_FileNameBuf)) {
if (!Yap_unify(tlib, MkAtomTerm(Yap_LookupAtom(LOCAL_FileNameBuf))))
return FALSE;
}
dir_done = true;
LOCAL_FileNameBuf[len] = '\0';
strncat(LOCAL_FileNameBuf, "PrologCommons", YAP_FILENAME_MAX);
if (!commons_done && is_directory(LOCAL_FileNameBuf)) {
if (!Yap_unify(tcommons, MkAtomTerm(Yap_LookupAtom(LOCAL_FileNameBuf))))
return FALSE;
}
commons_done = true;
#endif
return dir_done && commons_done;
}
static Int libraries_directories(USES_REGS1) {
return initSysPath(ARG1, ARG2, false, false);
}
static Int system_library(USES_REGS1) {
#if __ANDROID__
static Term dir = 0;
Term t;
if (IsVarTerm(t = Deref(ARG1))) {
if (dir == 0)
return false;
return Yap_unify(dir, ARG1);
}
if (!IsAtomTerm(t))
return false;
dir = t;
return true;
#else
return initSysPath(ARG1, MkVarTerm(), false, true);
#endif
}
static Int commons_library(USES_REGS1) {
return initSysPath(MkVarTerm(), ARG1, true, false);
}
static Int p_dir_sp(USES_REGS1) {
#if ATARI || _MSC_VER || defined(__MINGW32__)
Term t = MkIntTerm('\\');
Term t2 = MkIntTerm('/');
#else
Term t = MkIntTerm('/');
Term t2 = MkIntTerm('/');
#endif
return Yap_unify_constant(ARG1, t) || Yap_unify_constant(ARG1, t2);
}
size_t Yap_InitPageSize(void) {
#ifdef _WIN32
SYSTEM_INFO si;
GetSystemInfo(&si);
return si.dwPageSize;
#elif HAVE_UNISTD_H
#if defined(__FreeBSD__) || defined(__DragonFly__)
return getpagesize();
#elif defined(_AIX)
return sysconf(_SC_PAGE_SIZE);
#elif !defined(_SC_PAGESIZE)
return getpagesize();
#else
return sysconf(_SC_PAGESIZE);
#endif
#else
bla bla
#endif
}
/* TrueFileName -> Finds the true name of a file */
#ifdef __MINGW32__
#include <ctype.h>
#endif
static int volume_header(char *file) {
#if _MSC_VER || defined(__MINGW32__)
char *ch = file;
int c;
while ((c = ch[0]) != '\0') {
if (isalnum(c))
ch++;
else
return (c == ':');
}
#endif
return (FALSE);
}
int Yap_volume_header(char *file) { return volume_header(file); }
const char *Yap_getcwd(const char *cwd, size_t cwdlen) {
#if _WIN32 || defined(__MINGW32__)
if (GetCurrentDirectory(cwdlen, (char *)cwd) == 0) {
Yap_WinError("GetCurrentDirectory failed");
return NULL;
}
return (char *)cwd;
#endif
return getcwd((char *)cwd, cwdlen);
}
static Int working_directory(USES_REGS1) {
char dir[YAP_FILENAME_MAX + 1];
Term t1 = Deref(ARG1), t2;
if (!IsVarTerm(t1) && !IsAtomTerm(t1)) {
Yap_Error(TYPE_ERROR_ATOM, t1, "working_directory");
}
if (!Yap_unify(t1,
MkAtomTerm(Yap_LookupAtom(Yap_getcwd(dir, YAP_FILENAME_MAX)))))
return false;
t2 = Deref(ARG2);
if (IsVarTerm(t2)) {
Yap_Error(INSTANTIATION_ERROR, t2, "working_directory");
}
if (!IsAtomTerm(t2)) {
Yap_Error(TYPE_ERROR_ATOM, t2, "working_directory");
}
if (t2 == TermEmptyAtom || t2 == TermDot)
return true;
return ChDir(RepAtom(AtomOfTerm(t2))->StrOfAE);
}
/** Yap_findFile(): tries to locate a file, no expansion should be performed/
*
*
* @param isource the proper file
* @param idef the default name fothe file, ie, startup.yss
* @param root the prefix
* @param result the output
* @param access verify whether the file has access permission
* @param ftype saved state, object, saved file, prolog file
* @param expand_root expand $ ~, etc
* @param in_lib library file
*
* @return
*/
const char *Yap_findFile(const char *isource, const char *idef,
const char *iroot, char *result, bool access,
YAP_file_type_t ftype, bool expand_root, bool in_lib) {
char *save_buffer = NULL;
const char *root = iroot, *source = isource;
int rc = FAIL_RESTORE;
int try
= 0;
bool abspath = false;
//__android_log_print(ANDROID_LOG_ERROR, "YAPDroid " __FUNCTION__,
// "try=%d %s %s", try, isource, iroot) ; }
while (rc == FAIL_RESTORE) {
// means we failed this iteration
bool done = false;
// { CACHE_REGS
switch (try ++) {
case 0: // path or file name is given;
root = iroot;
if (idef || isource) {
source = (isource ? isource : idef);
}
if (source) {
if (source[0] == '/') {
abspath = true;
}
}
if (!abspath && !root && ftype == YAP_BOOT_PL) {
root = YAP_PL_SRCDIR;
}
break;
case 1: // library directory is given in command line
if (in_lib && ftype == YAP_SAVED_STATE) {
root = iroot;
source = (isource ? isource : idef);
} else {
done = true;
}
break;
case 2: // use environment variable YAPLIBDIR
#if HAVE_GETENV
if (in_lib) {
if (ftype == YAP_SAVED_STATE || ftype == YAP_OBJ) {
root = getenv("YAPLIBDIR");
} else if (ftype == YAP_BOOT_PL) {
root = getenv("YAPSHAREDIR"
"/pl");
if (root == NULL) {
continue;
} else {
save_buffer = getFileNameBuffer();
strncpy(save_buffer, root, YAP_FILENAME_MAX);
strncat(save_buffer, "/pl", YAP_FILENAME_MAX);
}
}
source = (isource ? isource : idef);
} else
#endif
done = true;
break;
case 3: // use compilation variable YAPLIBDIR
if (in_lib) {
source = (isource ? isource : idef);
if (ftype == YAP_PL) {
root = YAP_SHAREDIR;
} else if (ftype == YAP_BOOT_PL) {
root = YAP_SHAREDIR "/pl";
} else {
root = YAP_LIBDIR;
}
} else
done = true;
break;
case 4: // WIN stuff: registry
#if __WINDOWS__
if (in_lib) {
source = (ftype == YAP_PL || ftype == YAP_QLY ? "library" : "startup");
source = Yap_RegistryGetString(source);
root = NULL;
} else
#endif
done = true;
break;
case 5: // search from the binary
#ifndef __ANDROID__
{
done = true;
} break;
#endif
{
const char *pt = Yap_FindExecutable();
if (pt) {
if (ftype == YAP_BOOT_PL) {
#if __ANDROID__
root = "../../../files/Yap/pl";
#else
root = "../../share/Yap/pl";
#endif
} else {
root = (ftype == YAP_SAVED_STATE || ftype == YAP_OBJ
? "../../lib/Yap"
: "../../share/Yap");
}
if (root == iroot) {
done = true;
continue;
}
if (!save_buffer)
save_buffer = getFileNameBuffer();
if (Yap_findFile(source, NULL, root, save_buffer, access, ftype,
expand_root, in_lib))
root = save_buffer;
else
done = true;
} else {
done = true;
}
source = (isource ? isource : idef);
}
break;
case 6: // default, try current directory
if (!isource && ftype == YAP_SAVED_STATE)
source = idef;
root = NULL;
break;
default:
if (save_buffer)
freeFileNameBuffer(save_buffer);
return false;
}
if (done)
continue;
// { CACHE_REGS __android_log_print(ANDROID_LOG_ERROR, __FUNCTION__,
// "root= %s %s ", root, source) ; }
const char *work = PlExpandVars(source, root, result);
if (save_buffer)
freeFileNameBuffer(save_buffer);
// expand names in case you have
// to add a prefix
if (!access || Yap_Exists(work)) {
return work; // done
} else if (abspath)
return NULL;
}
return NULL;
}
static Int true_file_name(USES_REGS1) {
Term t = Deref(ARG1);
const char *s;
if (IsVarTerm(t)) {
Yap_Error(INSTANTIATION_ERROR, t, "argument to true_file_name unbound");
return FALSE;
}
if (IsAtomTerm(t)) {
s = RepAtom(AtomOfTerm(t))->StrOfAE;
} else if (IsStringTerm(t)) {
s = StringOfTerm(t);
} else {
Yap_Error(TYPE_ERROR_ATOM, t, "argument to true_file_name");
return FALSE;
}
if (!(s = Yap_AbsoluteFile(s, LOCAL_FileNameBuf, true)))
return false;
bool rc = Yap_unify(ARG2, MkAtomTerm(Yap_LookupAtom(s)));
freeBuffer(s);
return rc;
}
static Int p_expand_file_name(USES_REGS1) {
Term t = Deref(ARG1);
const char *text, *text2;
if (IsVarTerm(t)) {
Yap_Error(INSTANTIATION_ERROR, t, "argument to true_file_name unbound");
return FALSE;
}
text = Yap_TextTermToText(t, NULL, 0, LOCAL_encoding);
if (!text)
return false;
if (!(text2 = PlExpandVars(text, NULL, NULL)))
return false;
freeBuffer(text);
bool rc = Yap_unify(ARG2, Yap_MkTextTerm(text2, LOCAL_encoding, t));
freeBuffer(text2);
return rc;
}
static Int true_file_name3(USES_REGS1) {
Term t = Deref(ARG1), t2 = Deref(ARG2);
char *root = NULL;
if (IsVarTerm(t)) {
Yap_Error(INSTANTIATION_ERROR, t, "argument to true_file_name unbound");
return FALSE;
}
if (!IsAtomTerm(t)) {
Yap_Error(TYPE_ERROR_ATOM, t, "argument to true_file_name");
return FALSE;
}
if (!IsVarTerm(t2)) {
if (!IsAtomTerm(t)) {
Yap_Error(TYPE_ERROR_ATOM, t2, "argument to true_file_name");
return FALSE;
}
root = RepAtom(AtomOfTerm(t2))->StrOfAE;
}
if (!Yap_findFile(RepAtom(AtomOfTerm(t))->StrOfAE, NULL, root,
LOCAL_FileNameBuf, false, YAP_PL, false, false))
return FALSE;
return Yap_unify(ARG3, MkAtomTerm(Yap_LookupAtom(LOCAL_FileNameBuf)));
}
/* Executes $SHELL under Prolog */
/** @pred sh
Creates a new shell interaction.
*/
static Int p_sh(USES_REGS1) { /* sh */
#ifdef HAVE_SYSTEM
char *shell;
shell = (char *)getenv("SHELL");
if (shell == NULL)
shell = "/bin/sh";
if (system(shell) < 0) {
#if HAVE_STRERROR
Yap_Error(SYSTEM_ERROR_OPERATING_SYSTEM, TermNil, "%s in sh/0",
strerror(errno));
#else
Yap_Error(SYSTEM_ERROR_OPERATING_SYSTEM, TermNil, "in sh/0");
#endif
return FALSE;
}
return TRUE;
#else
#ifdef MSH
register char *shell;
shell = "msh -i";
system(shell);
return (TRUE);
#else
Yap_Error(SYSTEM_ERROR_INTERNAL, TermNil,
"sh not available in this configuration");
return (FALSE);
#endif /* MSH */
#endif
}
/** shell(+Command:text, -Status:integer) is det.
Run an external command and wait for its completion.
*/
static Int p_shell(USES_REGS1) { /* '$shell'(+SystCommand) */
const char *cmd;
Term t1 = Deref(ARG1);
if (IsAtomTerm(t1))
cmd = RepAtom(AtomOfTerm(t1))->StrOfAE;
else if (IsStringTerm(t1))
cmd = StringOfTerm(t1);
else
return FALSE;
#if _MSC_VER || defined(__MINGW32__)
{
int rval = system(cmd);
return rval == 0;
}
return true;
#else
#if HAVE_SYSTEM
char *shell;
register int bourne = FALSE;
shell = (char *)getenv("SHELL");
if (!strcmp(shell, "/bin/sh"))
bourne = TRUE;
if (shell == NIL)
bourne = TRUE;
/* Yap_CloseStreams(TRUE); */
if (bourne)
return system(cmd) == 0;
else {
int status = -1;
int child = fork();
if (child == 0) { /* let the children go */
if (!execl(shell, shell, "-c", cmd, NULL)) {
exit(-1);
}
exit(TRUE);
}
{ /* put the father on wait */
int result = child < 0 ||
/* vsc:I am not sure this is used, Stevens say wait returns
an integer.
#if NO_UNION_WAIT
*/
wait((&status)) != child ||
/*
#else
wait ((union wait *) (&status)) != child ||
#endif
*/
status == 0;
return result;
}
}
#else /* HAVE_SYSTEM */
#ifdef MSH
register char *shell;
shell = "msh -i";
/* Yap_CloseStreams(); */
system(shell);
return TRUE;
#else
Yap_Error(SYSTEM_ERROR_INTERNAL, TermNil,
"shell not available in this configuration");
return FALSE;
#endif
#endif /* HAVE_SYSTEM */
#endif /* _MSC_VER */
}
/** system(+Command:text).
Run an external command.
*/
static Int p_system(USES_REGS1) { /* '$system'(+SystCommand) */
const char *cmd;
Term t1 = Deref(ARG1);
if (IsVarTerm(t1)) {
Yap_Error(INSTANTIATION_ERROR, t1, "argument to system/1 unbound");
return FALSE;
} else if (IsAtomTerm(t1)) {
cmd = RepAtom(AtomOfTerm(t1))->StrOfAE;
} else if (IsStringTerm(t1)) {
cmd = StringOfTerm(t1);
} else {
if (!Yap_GetName(LOCAL_FileNameBuf, YAP_FILENAME_MAX, t1)) {
Yap_Error(TYPE_ERROR_ATOM, t1, "argument to system/1");
return false;
}
cmd = LOCAL_FileNameBuf;
}
/* Yap_CloseStreams(TRUE); */
#if _MSC_VER || defined(__MINGW32__)
{
STARTUPINFO si;
PROCESS_INFORMATION pi;
ZeroMemory(&si, sizeof(si));
si.cb = sizeof(si);
ZeroMemory(&pi, sizeof(pi));
// Start the child process.
if (!CreateProcess(NULL, // No module name (use command line)
(LPSTR)cmd, // Command line
NULL, // Process handle not inheritable
NULL, // Thread handle not inheritable
FALSE, // Set handle inheritance to FALSE
0, // No creation flags
NULL, // Use parent's environment block
NULL, // Use parent's starting directory
&si, // Pointer to STARTUPINFO structure
&pi) // Pointer to PROCESS_INFORMATION structure
) {
Yap_Error(SYSTEM_ERROR_INTERNAL, ARG1, "CreateProcess failed (%d).\n",
GetLastError());
return FALSE;
}
// Wait until child process exits.
WaitForSingleObject(pi.hProcess, INFINITE);
// Close process and thread handles.
CloseHandle(pi.hProcess);
CloseHandle(pi.hThread);
return TRUE;
}
return FALSE;
#elif HAVE_SYSTEM
#if _MSC_VER
_flushall();
#endif
if (system(cmd)) {
#if HAVE_STRERROR
Yap_Error(SYSTEM_ERROR_OPERATING_SYSTEM, t1, "%s in system(%s)",
strerror(errno), cmd);
#else
Yap_Error(SYSTEM_ERROR_OPERATING_SYSTEM, t1, "in system(%s)", cmd);
#endif
return FALSE;
}
return TRUE;
#else
#ifdef MSH
register char *shell;
shell = "msh -i";
/* Yap_CloseStreams(); */
system(shell);
return (TRUE);
#undef command
#else
Yap_Error(SYSTEM_ERROR_INTERNAL, TermNil, "sh not available in this machine");
return (FALSE);
#endif
#endif /* HAVE_SYSTEM */
}
static Int p_mv(USES_REGS1) { /* rename(+OldName,+NewName) */
#if HAVE_LINK
int r;
char *oldname, *newname;
Term t1 = Deref(ARG1);
Term t2 = Deref(ARG2);
if (IsVarTerm(t1)) {
Yap_Error(INSTANTIATION_ERROR, t1, "first argument to rename/2 unbound");
} else if (!IsAtomTerm(t1)) {
Yap_Error(TYPE_ERROR_ATOM, t1, "first argument to rename/2 not atom");
}
if (IsVarTerm(t2)) {
Yap_Error(INSTANTIATION_ERROR, t2, "second argument to rename/2 unbound");
} else if (!IsAtomTerm(t2)) {
Yap_Error(TYPE_ERROR_ATOM, t2, "second argument to rename/2 not atom");
} else {
oldname = (RepAtom(AtomOfTerm(t1)))->StrOfAE;
newname = (RepAtom(AtomOfTerm(t2)))->StrOfAE;
if ((r = link(oldname, newname)) == 0 && (r = unlink(oldname)) != 0)
unlink(newname);
if (r != 0) {
#if HAVE_STRERROR
Yap_Error(SYSTEM_ERROR_OPERATING_SYSTEM, t2, "%s in rename(%s,%s)",
strerror(errno), oldname, newname);
#else
Yap_Error(SYSTEM_ERROR_OPERATING_SYSTEM, t2, "in rename(%s,%s)", oldname,
newname);
#endif
return false;
}
return true;
}
#else
Yap_Error(SYSTEM_ERROR_INTERNAL, TermNil,
"rename/2 not available in this machine");
#endif
return false;
}
#ifdef MAC
void Yap_SetTextFile(name) char *name;
{
#ifdef MACC
SetFileType(name, 'TEXT');
SetFileSignature(name, 'EDIT');
#else
FInfo f;
FInfo *p = &f;
GetFInfo(name, 0, p);
p->fdType = 'TEXT';
#ifdef MPW
if (mpwshell)
p->fdCreator = 'MPS\0';
#endif
#ifndef LIGHT
else
p->fdCreator = 'EDIT';
#endif
SetFInfo(name, 0, p);
#endif
}
#endif
/* return YAP's environment */
static Int p_getenv(USES_REGS1) {
#if HAVE_GETENV
Term t1 = Deref(ARG1), to;
char *s, *so;
if (IsVarTerm(t1)) {
Yap_Error(INSTANTIATION_ERROR, t1, "first arg of getenv/2");
return (FALSE);
} else if (!IsAtomTerm(t1)) {
Yap_Error(TYPE_ERROR_ATOM, t1, "first arg of getenv/2");
return (FALSE);
} else
s = RepAtom(AtomOfTerm(t1))->StrOfAE;
if ((so = getenv(s)) == NULL)
return (FALSE);
to = MkAtomTerm(Yap_LookupAtom(so));
return (Yap_unify_constant(ARG2, to));
#else
Yap_Error(SYSTEM_ERROR_INTERNAL, TermNil,
"getenv not available in this configuration");
return (FALSE);
#endif
}
/* set a variable in YAP's environment */
static Int p_putenv(USES_REGS1) {
#if HAVE_PUTENV
Term t1 = Deref(ARG1), t2 = Deref(ARG2);
char *s = "", *s2 = "", *p0, *p;
if (IsVarTerm(t1)) {
Yap_Error(INSTANTIATION_ERROR, t1, "first arg to putenv/2");
return (FALSE);
} else if (!IsAtomTerm(t1)) {
Yap_Error(TYPE_ERROR_ATOM, t1, "first arg to putenv/2");
return (FALSE);
} else
s = RepAtom(AtomOfTerm(t1))->StrOfAE;
if (IsVarTerm(t2)) {
Yap_Error(INSTANTIATION_ERROR, t1, "second arg to putenv/2");
return (FALSE);
} else if (!IsAtomTerm(t2)) {
Yap_Error(TYPE_ERROR_ATOM, t2, "second arg to putenv/2");
return (FALSE);
} else
s2 = RepAtom(AtomOfTerm(t2))->StrOfAE;
while (!(p0 = p = Yap_AllocAtomSpace(strlen(s) + strlen(s2) + 3))) {
if (!Yap_growheap(FALSE, MinHeapGap, NULL)) {
Yap_Error(RESOURCE_ERROR_HEAP, TermNil, LOCAL_ErrorMessage);
return FALSE;
}
}
while ((*p++ = *s++) != '\0')
;
p[-1] = '=';
while ((*p++ = *s2++) != '\0')
;
if (putenv(p0) == 0)
return TRUE;
#if HAVE_STRERROR
Yap_Error(SYSTEM_ERROR_OPERATING_SYSTEM, TermNil, "in putenv(%s)",
strerror(errno), p0);
#else
Yap_Error(SYSTEM_ERROR_OPERATING_SYSTEM, TermNil, "in putenv(%s)", p0);
#endif
return FALSE;
#else
Yap_Error(SYSTEM_ERROR_INTERNAL, TermNil,
"putenv not available in this configuration");
return FALSE;
#endif
}
static Int p_host_type(USES_REGS1) {
Term out = MkAtomTerm(Yap_LookupAtom(HOST_ALIAS));
return (Yap_unify(out, ARG1));
}
static Int p_yap_home(USES_REGS1) {
Term out = MkAtomTerm(Yap_LookupAtom(YAP_ROOTDIR));
return (Yap_unify(out, ARG1));
}
static Int p_yap_paths(USES_REGS1) {
Term out1, out2, out3;
const char *env_destdir = getenv("DESTDIR");
char destdir[YAP_FILENAME_MAX + 1];
if (env_destdir) {
strncat(destdir, env_destdir, YAP_FILENAME_MAX);
strncat(destdir, "/" YAP_LIBDIR, YAP_FILENAME_MAX);
out1 = MkAtomTerm(Yap_LookupAtom(destdir));
} else {
out1 = MkAtomTerm(Yap_LookupAtom(YAP_LIBDIR));
}
if (env_destdir) {
strncat(destdir, env_destdir, YAP_FILENAME_MAX);
strncat(destdir, "/" YAP_SHAREDIR, YAP_FILENAME_MAX);
out2 = MkAtomTerm(Yap_LookupAtom(destdir));
} else {
out2 = MkAtomTerm(Yap_LookupAtom(YAP_SHAREDIR));
}
if (env_destdir) {
strncat(destdir, env_destdir, YAP_FILENAME_MAX);
strncat(destdir, "/" YAP_BINDIR, YAP_FILENAME_MAX);
out3 = MkAtomTerm(Yap_LookupAtom(destdir));
} else {
out3 = MkAtomTerm(Yap_LookupAtom(YAP_BINDIR));
}
return (Yap_unify(out1, ARG1) && Yap_unify(out2, ARG2) &&
Yap_unify(out3, ARG3));
}
static Int p_log_event(USES_REGS1) {
Term in = Deref(ARG1);
Atom at;
if (IsVarTerm(in))
return FALSE;
if (!IsAtomTerm(in))
return FALSE;
at = AtomOfTerm(in);
#if DEBUG
if (IsWideAtom(at))
fprintf(stderr, "LOG %S\n", RepAtom(at)->WStrOfAE);
else if (IsBlob(at))
return FALSE;
else
fprintf(stderr, "LOG %s\n", RepAtom(at)->StrOfAE);
#endif
if (IsWideAtom(at) || IsBlob(at))
return FALSE;
LOG(" %s ", RepAtom(at)->StrOfAE);
return TRUE;
}
static Int p_env_separator(USES_REGS1) {
#if defined(_WIN32)
return Yap_unify(MkIntegerTerm(';'), ARG1);
#else
return Yap_unify(MkIntegerTerm(':'), ARG1);
#endif
}
/*
* This is responsable for the initialization of all machine dependant
* predicates
*/
void Yap_InitSysbits(int wid) {
CACHE_REGS
#if __simplescalar__
{
char *pwd = getenv("PWD");
strncpy(GLOBAL_pwd, pwd, YAP_FILENAME_MAX);
}
#endif
Yap_InitWTime();
Yap_InitRandom();
/* let the caller control signals as it sees fit */
Yap_InitOSSignals(worker_id);
}
static Int p_unix(USES_REGS1) {
#ifdef unix
return TRUE;
#else
#ifdef __unix__
return TRUE;
#else
#ifdef __APPLE__
return TRUE;
#else
return FALSE;
#endif
#endif
#endif
}
static Int p_win32(USES_REGS1) {
#ifdef _WIN32
return TRUE;
#else
#ifdef __CYGWIN__
return TRUE;
#else
return FALSE;
#endif
#endif
}
static Int p_ld_path(USES_REGS1) {
return Yap_unify(ARG1, MkAtomTerm(Yap_LookupAtom(YAP_LIBDIR)));
}
static Int p_address_bits(USES_REGS1) {
#if SIZEOF_INT_P == 4
return Yap_unify(ARG1, MkIntTerm(32));
#else
return Yap_unify(ARG1, MkIntTerm(64));
#endif
}
#ifdef _WIN32
/* This code is from SWI-Prolog by Jan Wielemaker */
#define wstreq(s, q) (wcscmp((s), (q)) == 0)
static HKEY reg_open_key(const wchar_t *which, int create) {
HKEY key = HKEY_CURRENT_USER;
DWORD disp;
LONG rval;
while (*which) {
wchar_t buf[256];
wchar_t *s;
HKEY tmp;
for (s = buf; *which && !(*which == '/' || *which == '\\');)
*s++ = *which++;
*s = '\0';
if (*which)
which++;
if (wstreq(buf, L"HKEY_CLASSES_ROOT")) {
key = HKEY_CLASSES_ROOT;
continue;
} else if (wstreq(buf, L"HKEY_CURRENT_USER")) {
key = HKEY_CURRENT_USER;
continue;
} else if (wstreq(buf, L"HKEY_LOCAL_MACHINE")) {
key = HKEY_LOCAL_MACHINE;
continue;
} else if (wstreq(buf, L"HKEY_USERS")) {
key = HKEY_USERS;
continue;
}
if (RegOpenKeyExW(key, buf, 0L, KEY_READ, &tmp) == ERROR_SUCCESS) {
RegCloseKey(key);
key = tmp;
continue;
}
if (!create)
return NULL;
rval =
RegCreateKeyExW(key, buf, 0, L"", 0, KEY_ALL_ACCESS, NULL, &tmp, &disp);
RegCloseKey(key);
if (rval == ERROR_SUCCESS)
key = tmp;
else
return NULL;
}
return key;
}
#define MAXREGSTRLEN 1024
static void recover_space(wchar_t *k, Atom At) {
if (At->WStrOfAE != k)
Yap_FreeCodeSpace((char *)k);
}
static wchar_t *WideStringFromAtom(Atom KeyAt USES_REGS) {
if (IsWideAtom(KeyAt)) {
return KeyAt->WStrOfAE;
} else {
int len = strlen(KeyAt->StrOfAE);
int sz = sizeof(wchar_t) * (len + 1);
char *chp = KeyAt->StrOfAE;
wchar_t *kptr, *k;
k = (wchar_t *)Yap_AllocCodeSpace(sz);
while (k == NULL) {
if (!Yap_growheap(false, sz, NULL)) {
Yap_Error(RESOURCE_ERROR_HEAP, MkIntegerTerm(sz),
"generating key in win_registry_get_value/3");
return false;
}
k = (wchar_t *)Yap_AllocCodeSpace(sz);
}
kptr = k;
while ((*kptr++ = *chp++))
;
return k;
}
}
static Int p_win_registry_get_value(USES_REGS1) {
DWORD type;
BYTE data[MAXREGSTRLEN];
DWORD len = sizeof(data);
wchar_t *k, *name;
HKEY key;
Term Key = Deref(ARG1);
Term Name = Deref(ARG2);
Atom KeyAt, NameAt;
if (IsVarTerm(Key)) {
Yap_Error(INSTANTIATION_ERROR, Key,
"argument to win_registry_get_value unbound");
return FALSE;
}
if (!IsAtomTerm(Key)) {
Yap_Error(TYPE_ERROR_ATOM, Key, "argument to win_registry_get_value");
return FALSE;
}
KeyAt = AtomOfTerm(Key);
if (IsVarTerm(Name)) {
Yap_Error(INSTANTIATION_ERROR, Key,
"argument to win_registry_get_value unbound");
return FALSE;
}
if (!IsAtomTerm(Name)) {
Yap_Error(TYPE_ERROR_ATOM, Key, "argument to win_registry_get_value");
return FALSE;
}
NameAt = AtomOfTerm(Name);
k = WideStringFromAtom(KeyAt PASS_REGS);
if (!(key = reg_open_key(k, FALSE))) {
Yap_Error(EXISTENCE_ERROR_KEY, Key, "argument to win_registry_get_value");
recover_space(k, KeyAt);
return FALSE;
}
name = WideStringFromAtom(NameAt PASS_REGS);
if (RegQueryValueExW(key, name, NULL, &type, data, &len) == ERROR_SUCCESS) {
RegCloseKey(key);
switch (type) {
case REG_SZ:
recover_space(k, KeyAt);
recover_space(name, NameAt);
((wchar_t *)data)[len] = '\0';
return Yap_unify(MkAtomTerm(Yap_LookupMaybeWideAtom((wchar_t *)data)),
ARG3);
case REG_DWORD:
recover_space(k, KeyAt);
recover_space(name, NameAt);
{
DWORD *d = (DWORD *)data;
return Yap_unify(MkIntegerTerm((Int)d[0]), ARG3);
}
default:
recover_space(k, KeyAt);
recover_space(name, NameAt);
return FALSE;
}
}
recover_space(k, KeyAt);
recover_space(name, NameAt);
return FALSE;
}
char *Yap_RegistryGetString(char *name) {
DWORD type;
BYTE data[MAXREGSTRLEN];
DWORD len = sizeof(data);
HKEY key;
char *ptr;
int i;
#if SIZEOF_INT_P == 8
if (!(key =
reg_open_key(L"HKEY_LOCAL_MACHINE/SOFTWARE/YAP/Prolog64", FALSE))) {
return NULL;
}
#else
if (!(key = reg_open_key(L"HKEY_LOCAL_MACHINE/SOFTWARE/YAP/Prolog", FALSE))) {
return NULL;
}
#endif
if (RegQueryValueEx(key, name, NULL, &type, data, &len) == ERROR_SUCCESS) {
RegCloseKey(key);
switch (type) {
case REG_SZ:
ptr = malloc(len + 2);
if (!ptr)
return NULL;
for (i = 0; i <= len; i++)
ptr[i] = data[i];
ptr[len + 1] = '\0';
return ptr;
default:
return NULL;
}
}
return NULL;
}
#endif
void Yap_InitSysPreds(void) {
Yap_InitCPred("log_event", 1, p_log_event, SafePredFlag | SyncPredFlag);
Yap_InitCPred("sh", 0, p_sh, SafePredFlag | SyncPredFlag);
Yap_InitCPred("$shell", 1, p_shell, SafePredFlag | SyncPredFlag);
Yap_InitCPred("system", 1, p_system,
SafePredFlag | SyncPredFlag | UserCPredFlag);
Yap_InitCPred("$rename", 2, p_mv, SafePredFlag | SyncPredFlag);
Yap_InitCPred("$yap_home", 1, p_yap_home, SafePredFlag);
Yap_InitCPred("$yap_paths", 3, p_yap_paths, SafePredFlag);
Yap_InitCPred("$dir_separator", 1, p_dir_sp, SafePredFlag);
Yap_InitCPred("libraries_directories", 2, libraries_directories, 0);
Yap_InitCPred("system_library", 1, system_library, 0);
Yap_InitCPred("commons_library", 1, commons_library, 0);
Yap_InitCPred("$getenv", 2, p_getenv, SafePredFlag);
Yap_InitCPred("$putenv", 2, p_putenv, SafePredFlag | SyncPredFlag);
Yap_InitCPred("$host_type", 1, p_host_type, SafePredFlag | SyncPredFlag);
Yap_InitCPred("$env_separator", 1, p_env_separator, SafePredFlag);
Yap_InitCPred("$unix", 0, p_unix, SafePredFlag);
Yap_InitCPred("$win32", 0, p_win32, SafePredFlag);
Yap_InitCPred("$ld_path", 1, p_ld_path, SafePredFlag);
Yap_InitCPred("$address_bits", 1, p_address_bits, SafePredFlag);
Yap_InitCPred("$expand_file_name", 2, p_expand_file_name, SyncPredFlag);
Yap_InitCPred("expand_file_name", 3, expand_file_name3, SyncPredFlag);
Yap_InitCPred("expand_file_name", 2, expand_file_name, SyncPredFlag);
Yap_InitCPred("working_directory", 2, working_directory, SyncPredFlag);
Yap_InitCPred("prolog_to_os_filename", 2, prolog_to_os_filename,
SyncPredFlag);
Yap_InitCPred("absolute_file_system_path", 2, absolute_file_system_path, 0);
Yap_InitCPred("real_path", 2, real_path, 0);
Yap_InitCPred("true_file_name", 2, true_file_name, SyncPredFlag);
Yap_InitCPred("true_file_name", 3, true_file_name3, SyncPredFlag);
#ifdef _WIN32
Yap_InitCPred("win_registry_get_value", 3, p_win_registry_get_value, 0);
#endif
Yap_InitCPred("rmdir", 2, p_rmdir, SyncPredFlag);
Yap_InitCPred("make_directory", 1, make_directory, SyncPredFlag);
}
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