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-rw-r--r--cpan/Cwd/Cwd.xs494
1 files changed, 494 insertions, 0 deletions
diff --git a/cpan/Cwd/Cwd.xs b/cpan/Cwd/Cwd.xs
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+#include "EXTERN.h"
+#include "perl.h"
+#include "XSUB.h"
+#ifndef NO_PPPORT_H
+# define NEED_my_strlcpy
+# define NEED_my_strlcat
+# include "ppport.h"
+#endif
+
+#ifdef I_UNISTD
+# include <unistd.h>
+#endif
+
+/* The realpath() implementation from OpenBSD 3.9 to 4.2 (realpath.c 1.13)
+ * Renamed here to bsd_realpath() to avoid library conflicts.
+ */
+
+/* See
+ * http://www.xray.mpe.mpg.de/mailing-lists/perl5-porters/2004-11/msg00979.html
+ * for the details of why the BSD license is compatible with the
+ * AL/GPL standard perl license.
+ */
+
+/*
+ * Copyright (c) 2003 Constantin S. Svintsoff <kostik@iclub.nsu.ru>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. The names of the authors may not be used to endorse or promote
+ * products derived from this software without specific prior written
+ * permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+/* OpenBSD system #includes removed since the Perl ones should do. --jhi */
+
+#ifndef MAXSYMLINKS
+#define MAXSYMLINKS 8
+#endif
+
+/*
+ * char *realpath(const char *path, char resolved[MAXPATHLEN]);
+ *
+ * Find the real name of path, by removing all ".", ".." and symlink
+ * components. Returns (resolved) on success, or (NULL) on failure,
+ * in which case the path which caused trouble is left in (resolved).
+ */
+static
+char *
+bsd_realpath(const char *path, char resolved[MAXPATHLEN])
+{
+#ifdef VMS
+ dTHX;
+ return Perl_rmsexpand(aTHX_ (char*)path, resolved, NULL, 0);
+#else
+ char *p, *q, *s;
+ size_t left_len, resolved_len;
+ unsigned symlinks;
+ int serrno;
+ char left[MAXPATHLEN], next_token[MAXPATHLEN], symlink[MAXPATHLEN];
+
+ serrno = errno;
+ symlinks = 0;
+ if (path[0] == '/') {
+ resolved[0] = '/';
+ resolved[1] = '\0';
+ if (path[1] == '\0')
+ return (resolved);
+ resolved_len = 1;
+ left_len = my_strlcpy(left, path + 1, sizeof(left));
+ } else {
+ if (getcwd(resolved, MAXPATHLEN) == NULL) {
+ my_strlcpy(resolved, ".", MAXPATHLEN);
+ return (NULL);
+ }
+ resolved_len = strlen(resolved);
+ left_len = my_strlcpy(left, path, sizeof(left));
+ }
+ if (left_len >= sizeof(left) || resolved_len >= MAXPATHLEN) {
+ errno = ENAMETOOLONG;
+ return (NULL);
+ }
+
+ /*
+ * Iterate over path components in `left'.
+ */
+ while (left_len != 0) {
+ /*
+ * Extract the next path component and adjust `left'
+ * and its length.
+ */
+ p = strchr(left, '/');
+ s = p ? p : left + left_len;
+ if (s - left >= sizeof(next_token)) {
+ errno = ENAMETOOLONG;
+ return (NULL);
+ }
+ memcpy(next_token, left, s - left);
+ next_token[s - left] = '\0';
+ left_len -= s - left;
+ if (p != NULL)
+ memmove(left, s + 1, left_len + 1);
+ if (resolved[resolved_len - 1] != '/') {
+ if (resolved_len + 1 >= MAXPATHLEN) {
+ errno = ENAMETOOLONG;
+ return (NULL);
+ }
+ resolved[resolved_len++] = '/';
+ resolved[resolved_len] = '\0';
+ }
+ if (next_token[0] == '\0')
+ continue;
+ else if (strcmp(next_token, ".") == 0)
+ continue;
+ else if (strcmp(next_token, "..") == 0) {
+ /*
+ * Strip the last path component except when we have
+ * single "/"
+ */
+ if (resolved_len > 1) {
+ resolved[resolved_len - 1] = '\0';
+ q = strrchr(resolved, '/') + 1;
+ *q = '\0';
+ resolved_len = q - resolved;
+ }
+ continue;
+ }
+
+ /*
+ * Append the next path component and lstat() it. If
+ * lstat() fails we still can return successfully if
+ * there are no more path components left.
+ */
+ resolved_len = my_strlcat(resolved, next_token, MAXPATHLEN);
+ if (resolved_len >= MAXPATHLEN) {
+ errno = ENAMETOOLONG;
+ return (NULL);
+ }
+ #if defined(HAS_LSTAT) && defined(HAS_READLINK) && defined(HAS_SYMLINK)
+ {
+ struct stat sb;
+ if (lstat(resolved, &sb) != 0) {
+ if (errno == ENOENT && p == NULL) {
+ errno = serrno;
+ return (resolved);
+ }
+ return (NULL);
+ }
+ if (S_ISLNK(sb.st_mode)) {
+ int slen;
+
+ if (symlinks++ > MAXSYMLINKS) {
+ errno = ELOOP;
+ return (NULL);
+ }
+ slen = readlink(resolved, symlink, sizeof(symlink) - 1);
+ if (slen < 0)
+ return (NULL);
+ symlink[slen] = '\0';
+ if (symlink[0] == '/') {
+ resolved[1] = 0;
+ resolved_len = 1;
+ } else if (resolved_len > 1) {
+ /* Strip the last path component. */
+ resolved[resolved_len - 1] = '\0';
+ q = strrchr(resolved, '/') + 1;
+ *q = '\0';
+ resolved_len = q - resolved;
+ }
+
+ /*
+ * If there are any path components left, then
+ * append them to symlink. The result is placed
+ * in `left'.
+ */
+ if (p != NULL) {
+ if (symlink[slen - 1] != '/') {
+ if (slen + 1 >= sizeof(symlink)) {
+ errno = ENAMETOOLONG;
+ return (NULL);
+ }
+ symlink[slen] = '/';
+ symlink[slen + 1] = 0;
+ }
+ left_len = my_strlcat(symlink, left, sizeof(left));
+ if (left_len >= sizeof(left)) {
+ errno = ENAMETOOLONG;
+ return (NULL);
+ }
+ }
+ left_len = my_strlcpy(left, symlink, sizeof(left));
+ }
+ }
+ #endif
+ }
+
+ /*
+ * Remove trailing slash except when the resolved pathname
+ * is a single "/".
+ */
+ if (resolved_len > 1 && resolved[resolved_len - 1] == '/')
+ resolved[resolved_len - 1] = '\0';
+ return (resolved);
+#endif
+}
+
+#ifndef SV_CWD_RETURN_UNDEF
+#define SV_CWD_RETURN_UNDEF \
+sv_setsv(sv, &PL_sv_undef); \
+return FALSE
+#endif
+
+#ifndef OPpENTERSUB_HASTARG
+#define OPpENTERSUB_HASTARG 32 /* Called from OP tree. */
+#endif
+
+#ifndef dXSTARG
+#define dXSTARG SV * targ = ((PL_op->op_private & OPpENTERSUB_HASTARG) \
+ ? PAD_SV(PL_op->op_targ) : sv_newmortal())
+#endif
+
+#ifndef XSprePUSH
+#define XSprePUSH (sp = PL_stack_base + ax - 1)
+#endif
+
+#ifndef SV_CWD_ISDOT
+#define SV_CWD_ISDOT(dp) \
+ (dp->d_name[0] == '.' && (dp->d_name[1] == '\0' || \
+ (dp->d_name[1] == '.' && dp->d_name[2] == '\0')))
+#endif
+
+#ifndef getcwd_sv
+/* Taken from perl 5.8's util.c */
+#define getcwd_sv(a) Perl_getcwd_sv(aTHX_ a)
+int Perl_getcwd_sv(pTHX_ register SV *sv)
+{
+#ifndef PERL_MICRO
+
+#ifndef INCOMPLETE_TAINTS
+ SvTAINTED_on(sv);
+#endif
+
+#ifdef HAS_GETCWD
+ {
+ char buf[MAXPATHLEN];
+
+ /* Some getcwd()s automatically allocate a buffer of the given
+ * size from the heap if they are given a NULL buffer pointer.
+ * The problem is that this behaviour is not portable. */
+ if (getcwd(buf, sizeof(buf) - 1)) {
+ STRLEN len = strlen(buf);
+ sv_setpvn(sv, buf, len);
+ return TRUE;
+ }
+ else {
+ sv_setsv(sv, &PL_sv_undef);
+ return FALSE;
+ }
+ }
+
+#else
+ {
+ Stat_t statbuf;
+ int orig_cdev, orig_cino, cdev, cino, odev, oino, tdev, tino;
+ int namelen, pathlen=0;
+ DIR *dir;
+ Direntry_t *dp;
+
+ (void)SvUPGRADE(sv, SVt_PV);
+
+ if (PerlLIO_lstat(".", &statbuf) < 0) {
+ SV_CWD_RETURN_UNDEF;
+ }
+
+ orig_cdev = statbuf.st_dev;
+ orig_cino = statbuf.st_ino;
+ cdev = orig_cdev;
+ cino = orig_cino;
+
+ for (;;) {
+ odev = cdev;
+ oino = cino;
+
+ if (PerlDir_chdir("..") < 0) {
+ SV_CWD_RETURN_UNDEF;
+ }
+ if (PerlLIO_stat(".", &statbuf) < 0) {
+ SV_CWD_RETURN_UNDEF;
+ }
+
+ cdev = statbuf.st_dev;
+ cino = statbuf.st_ino;
+
+ if (odev == cdev && oino == cino) {
+ break;
+ }
+ if (!(dir = PerlDir_open("."))) {
+ SV_CWD_RETURN_UNDEF;
+ }
+
+ while ((dp = PerlDir_read(dir)) != NULL) {
+#ifdef DIRNAMLEN
+ namelen = dp->d_namlen;
+#else
+ namelen = strlen(dp->d_name);
+#endif
+ /* skip . and .. */
+ if (SV_CWD_ISDOT(dp)) {
+ continue;
+ }
+
+ if (PerlLIO_lstat(dp->d_name, &statbuf) < 0) {
+ SV_CWD_RETURN_UNDEF;
+ }
+
+ tdev = statbuf.st_dev;
+ tino = statbuf.st_ino;
+ if (tino == oino && tdev == odev) {
+ break;
+ }
+ }
+
+ if (!dp) {
+ SV_CWD_RETURN_UNDEF;
+ }
+
+ if (pathlen + namelen + 1 >= MAXPATHLEN) {
+ SV_CWD_RETURN_UNDEF;
+ }
+
+ SvGROW(sv, pathlen + namelen + 1);
+
+ if (pathlen) {
+ /* shift down */
+ Move(SvPVX(sv), SvPVX(sv) + namelen + 1, pathlen, char);
+ }
+
+ /* prepend current directory to the front */
+ *SvPVX(sv) = '/';
+ Move(dp->d_name, SvPVX(sv)+1, namelen, char);
+ pathlen += (namelen + 1);
+
+#ifdef VOID_CLOSEDIR
+ PerlDir_close(dir);
+#else
+ if (PerlDir_close(dir) < 0) {
+ SV_CWD_RETURN_UNDEF;
+ }
+#endif
+ }
+
+ if (pathlen) {
+ SvCUR_set(sv, pathlen);
+ *SvEND(sv) = '\0';
+ SvPOK_only(sv);
+
+ if (PerlDir_chdir(SvPVX(sv)) < 0) {
+ SV_CWD_RETURN_UNDEF;
+ }
+ }
+ if (PerlLIO_stat(".", &statbuf) < 0) {
+ SV_CWD_RETURN_UNDEF;
+ }
+
+ cdev = statbuf.st_dev;
+ cino = statbuf.st_ino;
+
+ if (cdev != orig_cdev || cino != orig_cino) {
+ Perl_croak(aTHX_ "Unstable directory path, "
+ "current directory changed unexpectedly");
+ }
+
+ return TRUE;
+ }
+#endif
+
+#else
+ return FALSE;
+#endif
+}
+
+#endif
+
+
+MODULE = Cwd PACKAGE = Cwd
+
+PROTOTYPES: ENABLE
+
+void
+fastcwd()
+PROTOTYPE: DISABLE
+PPCODE:
+{
+ dXSTARG;
+ getcwd_sv(TARG);
+ XSprePUSH; PUSHTARG;
+#ifndef INCOMPLETE_TAINTS
+ SvTAINTED_on(TARG);
+#endif
+}
+
+void
+getcwd(...)
+PROTOTYPE: DISABLE
+PPCODE:
+{
+ dXSTARG;
+ getcwd_sv(TARG);
+ XSprePUSH; PUSHTARG;
+#ifndef INCOMPLETE_TAINTS
+ SvTAINTED_on(TARG);
+#endif
+}
+
+void
+abs_path(pathsv=Nullsv)
+ SV *pathsv
+PROTOTYPE: DISABLE
+PPCODE:
+{
+ dXSTARG;
+ char *path;
+ char buf[MAXPATHLEN];
+
+ path = pathsv ? SvPV_nolen(pathsv) : (char *)".";
+
+ if (bsd_realpath(path, buf)) {
+ sv_setpvn(TARG, buf, strlen(buf));
+ SvPOK_only(TARG);
+ SvTAINTED_on(TARG);
+ }
+ else
+ sv_setsv(TARG, &PL_sv_undef);
+
+ XSprePUSH; PUSHTARG;
+#ifndef INCOMPLETE_TAINTS
+ SvTAINTED_on(TARG);
+#endif
+}
+
+#if defined(WIN32) && !defined(UNDER_CE)
+
+void
+getdcwd(...)
+PPCODE:
+{
+ dXSTARG;
+ int drive;
+ char *dir;
+
+ /* Drive 0 is the current drive, 1 is A:, 2 is B:, 3 is C: and so on. */
+ if ( items == 0 ||
+ (items == 1 && (!SvOK(ST(0)) || (SvPOK(ST(0)) && !SvCUR(ST(0))))))
+ drive = 0;
+ else if (items == 1 && SvPOK(ST(0)) && SvCUR(ST(0)) &&
+ isALPHA(SvPVX(ST(0))[0]))
+ drive = toUPPER(SvPVX(ST(0))[0]) - 'A' + 1;
+ else
+ croak("Usage: getdcwd(DRIVE)");
+
+ New(0,dir,MAXPATHLEN,char);
+ if (_getdcwd(drive, dir, MAXPATHLEN)) {
+ sv_setpvn(TARG, dir, strlen(dir));
+ SvPOK_only(TARG);
+ }
+ else
+ sv_setsv(TARG, &PL_sv_undef);
+
+ Safefree(dir);
+
+ XSprePUSH; PUSHTARG;
+#ifndef INCOMPLETE_TAINTS
+ SvTAINTED_on(TARG);
+#endif
+}
+
+#endif
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