#include "perl.h"
#include "XSUB.h"
-/* Originally written in Perl by John Bazik; rewritten in C by Ben Sugars.
- * Comments from the orignal:
- * This is a faster version of getcwd. It's also more dangerous
- * because you might chdir out of a directory that you can't chdir
- * back into. */
+#ifdef I_UNISTD
+# include <unistd.h>
+#endif
+
+/* The realpath() implementation from OpenBSD 2.9 (realpath.c 1.4)
+ * Renamed here to bsd_realpath() to avoid library conflicts.
+ * --jhi 2000-06-20 */
+
+/*
+ * Copyright (c) 1994
+ * The Regents of the University of California. All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Jan-Simon Pendry.
+ *
+ * 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. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
+ */
+
+#if defined(LIBC_SCCS) && !defined(lint)
+static char *rcsid = "$OpenBSD: realpath.c,v 1.4 1998/05/18 09:55:19 deraadt Exp $";
+#endif /* LIBC_SCCS and not lint */
+
+/* OpenBSD system #includes removed since the Perl ones should do. --jhi */
+
+#ifndef MAXSYMLINKS
+#define MAXSYMLINKS 8
+#endif
+
+/*
+ * char *realpath(const char *path, char resolved_path[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 *
-_cwdxs_fastcwd(void)
+bsd_realpath(path, resolved)
+ const char *path;
+ char *resolved;
{
-/* XXX Should we just use getcwd(3) if available? */
- struct stat statbuf;
- int orig_cdev, orig_cino, cdev, cino, odev, oino, tdev, tino;
- int i = 0, j = 0, k = 0, ndirs = 16, pathlen = 0, namelen;
- DIR *dir;
- Direntry_t *dp;
- char **names, *path;
-
- Newz(0, names, ndirs, char*);
-
- if (PerlLIO_lstat(".", &statbuf) < 0) {
- Safefree(names);
- return FALSE;
- }
- 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) {
- Safefree(names);
- return FALSE;
- }
- if (PerlLIO_stat(".", &statbuf) < 0) {
- Safefree(names);
- return FALSE;
- }
- cdev = statbuf.st_dev;
- cino = statbuf.st_ino;
- if (odev == cdev && oino == cino)
- break;
-
- if (!(dir = PerlDir_open("."))) {
- Safefree(names);
- return FALSE;
- }
-
- while ((dp = PerlDir_read(dir)) != NULL) {
- if (PerlLIO_lstat(dp->d_name, &statbuf) < 0) {
- Safefree(names);
- return FALSE;
- }
- if (strEQ(dp->d_name, "."))
- continue;
- if (strEQ(dp->d_name, ".."))
- continue;
- tdev = statbuf.st_dev;
- tino = statbuf.st_ino;
- if (tino == oino && tdev == odev)
- break;
- }
+#ifdef VMS
+ dTHX;
+ return Perl_rmsexpand(aTHX_ (char*)path, resolved, NULL, 0);
+#else
+ int rootd, serrno;
+ char *p, *q, wbuf[MAXPATHLEN];
+ int symlinks = 0;
+
+ /* Save the starting point. */
+#ifdef HAS_FCHDIR
+ int fd;
+
+ if ((fd = open(".", O_RDONLY)) < 0) {
+ (void)strcpy(resolved, ".");
+ return (NULL);
+ }
+#else
+ char wd[MAXPATHLEN];
- if (!dp) {
- Safefree(names);
- return FALSE;
- }
+ if (getcwd(wd, MAXPATHLEN - 1) == NULL) {
+ (void)strcpy(resolved, ".");
+ return (NULL);
+ }
+#endif
- if (i >= ndirs) {
- ndirs += 16;
- Renew(names, ndirs, char*);
+ /*
+ * Find the dirname and basename from the path to be resolved.
+ * Change directory to the dirname component.
+ * lstat the basename part.
+ * if it is a symlink, read in the value and loop.
+ * if it is a directory, then change to that directory.
+ * get the current directory name and append the basename.
+ */
+ (void)strncpy(resolved, path, MAXPATHLEN - 1);
+ resolved[MAXPATHLEN - 1] = '\0';
+loop:
+ q = strrchr(resolved, '/');
+ if (q != NULL) {
+ p = q + 1;
+ if (q == resolved)
+ q = "/";
+ else {
+ do {
+ --q;
+ } while (q > resolved && *q == '/');
+ q[1] = '\0';
+ q = resolved;
+ }
+ if (chdir(q) < 0)
+ goto err1;
+ } else
+ p = resolved;
+
+#if defined(HAS_LSTAT) && defined(HAS_READLINK) && defined(HAS_SYMLINK)
+ {
+ struct stat sb;
+ /* Deal with the last component. */
+ if (lstat(p, &sb) == 0) {
+ if (S_ISLNK(sb.st_mode)) {
+ int n;
+ if (++symlinks > MAXSYMLINKS) {
+ errno = ELOOP;
+ goto err1;
+ }
+ n = readlink(p, resolved, MAXPATHLEN-1);
+ if (n < 0)
+ goto err1;
+ resolved[n] = '\0';
+ goto loop;
+ }
+ if (S_ISDIR(sb.st_mode)) {
+ if (chdir(p) < 0)
+ goto err1;
+ p = "";
+ }
+ }
}
-#ifdef DIRNAMLEN
- namelen = dp->d_namlen;
-#else
- namelen = strlen(dp->d_name);
#endif
- Newz(0, *(names + i), namelen + 1, char);
- Copy(dp->d_name, *(names + i), namelen, char);
- *(names[i] + namelen) = '\0';
- pathlen += (namelen + 1);
- ++i;
-
-#ifdef VOID_CLOSEDIR
- PerlDir_close(dir);
+
+ /*
+ * Save the last component name and get the full pathname of
+ * the current directory.
+ */
+ (void)strcpy(wbuf, p);
+ if (getcwd(resolved, MAXPATHLEN) == 0)
+ goto err1;
+
+ /*
+ * Join the two strings together, ensuring that the right thing
+ * happens if the last component is empty, or the dirname is root.
+ */
+ if (resolved[0] == '/' && resolved[1] == '\0')
+ rootd = 1;
+ else
+ rootd = 0;
+
+ if (*wbuf) {
+ if (strlen(resolved) + strlen(wbuf) + rootd + 1 > MAXPATHLEN) {
+ errno = ENAMETOOLONG;
+ goto err1;
+ }
+ if (rootd == 0)
+ (void)strcat(resolved, "/");
+ (void)strcat(resolved, wbuf);
+ }
+
+ /* Go back to where we came from. */
+#ifdef HAS_FCHDIR
+ if (fchdir(fd) < 0) {
+ serrno = errno;
+ goto err2;
+ }
#else
- if (PerlDir_close(dir) < 0) {
- Safefree(names);
- return FALSE;
- }
+ if (chdir(wd) < 0) {
+ serrno = errno;
+ goto err2;
+ }
#endif
- }
-
- Newz(0, path, pathlen + 1, char);
- for (j = i - 1; j >= 0; j--) {
- *(path + k) = '/';
- Copy(names[j], path + k + 1, strlen(names[j]) + 1, char);
- k = k + strlen(names[j]) + 1;
- Safefree(names[j]);
- }
-
- if (PerlDir_chdir(path) < 0) {
- Safefree(names);
- Safefree(path);
- return FALSE;
- }
- if (PerlLIO_stat(".", &statbuf) < 0) {
- Safefree(names);
- Safefree(path);
- return FALSE;
- }
- 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");
-
- Safefree(names);
- return(path);
-}
-char *
-_cwdxs_abs_path(char *start)
-{
- DIR *parent;
- Direntry_t *dp;
- char dotdots[MAXPATHLEN] = { 0 };
- char dir[MAXPATHLEN] = { 0 };
- char name[MAXPATHLEN] = { 0 };
- char *cwd;
- int namelen;
- struct stat cst, pst, tst;
-
- if (PerlLIO_stat(start, &cst) < 0) {
- warn("abs_path: stat(\"%s\"): %s", start, Strerror(errno));
- return FALSE;
- }
-
- Newz(0, cwd, MAXPATHLEN, char);
- Copy(start, dotdots, strlen(start), char);
-
- for (;;) {
- strcat(dotdots, "/..");
- StructCopy(&cst, &pst, struct stat);
-
- if (PerlLIO_stat(dotdots, &cst) < 0) {
- Safefree(cwd);
- warn("abs_path: stat(\"%s\"): %s", dotdots, Strerror(errno));
- return FALSE;
- }
-
- if (pst.st_dev == cst.st_dev && pst.st_ino == cst.st_ino) {
- /* We've reached the root: previous is same as current */
- break;
- } else {
- STRLEN dotdotslen = strlen(dotdots);
-
- /* Scan through the dir looking for name of previous */
- if (!(parent = PerlDir_open(dotdots))) {
- Safefree(cwd);
- warn("abs_path: opendir(\"%s\"): %s", dotdots, Strerror(errno));
- return FALSE;
- }
-
- SETERRNO(0,SS$_NORMAL); /* for readdir() */
- while ((dp = PerlDir_read(parent)) != NULL) {
- if (strEQ(dp->d_name, "."))
- continue;
- if (strEQ(dp->d_name, ".."))
- continue;
-
- Copy(dotdots, name, dotdotslen, char);
- name[dotdotslen] = '/';
-#ifdef DIRNAMLEN
- namelen = dp->d_namlen;
-#else
- namelen = strlen(dp->d_name);
+ /* It's okay if the close fails, what's an fd more or less? */
+#ifdef HAS_FCHDIR
+ (void)close(fd);
#endif
- Copy(dp->d_name, name + dotdotslen + 1, namelen, char);
- name[dotdotslen + 1 + namelen] = 0;
-
- if (PerlLIO_lstat(name, &tst) < 0) {
- Safefree(cwd);
- PerlDir_close(parent);
- warn("abs_path: lstat(\"%s\"): %s", name, Strerror(errno));
- return FALSE;
- }
-
- if (tst.st_dev == pst.st_dev && tst.st_ino == pst.st_ino)
- break;
-
- SETERRNO(0,SS$_NORMAL); /* for readdir() */
- }
-
-
- if (!dp && errno) {
- warn("abs_path: readdir(\"%s\"): %s", dotdots, Strerror(errno));
- Safefree(cwd);
- return FALSE;
- }
-
- Move(cwd, cwd + namelen + 1, strlen(cwd), char);
- Copy(dp->d_name, cwd + 1, namelen, char);
-#ifdef VOID_CLOSEDIR
- PerlDir_close(parent);
+ return (resolved);
+
+err1: serrno = errno;
+#ifdef HAS_FCHDIR
+ (void)fchdir(fd);
#else
- if (PerlDir_close(parent) < 0) {
- warn("abs_path: closedir(\"%s\"): %s", dotdots, Strerror(errno));
- Safefree(cwd);
- return FALSE;
- }
+ (void)chdir(wd);
#endif
- *cwd = '/';
- }
- }
- return cwd;
+err2:
+#ifdef HAS_FCHDIR
+ (void)close(fd);
+#endif
+ errno = serrno;
+ return (NULL);
+#endif
}
-
MODULE = Cwd PACKAGE = Cwd
PROTOTYPES: ENABLE
-char *
-_fastcwd()
+void
+fastcwd()
+PROTOTYPE: DISABLE
PPCODE:
- char * buf;
- buf = _cwdxs_fastcwd();
- if (buf) {
- PUSHs(sv_2mortal(newSVpv(buf, 0)));
- Safefree(buf);
- }
- else
- XSRETURN_UNDEF;
+{
+ dXSTARG;
+ getcwd_sv(TARG);
+ XSprePUSH; PUSHTARG;
+}
-char *
-_abs_path(start = ".")
- char * start
-PREINIT:
- char * buf;
+void
+abs_path(pathsv=Nullsv)
+ SV *pathsv
PPCODE:
- buf = _cwdxs_abs_path(start);
- if (buf) {
- PUSHs(sv_2mortal(newSVpv(buf, 0)));
- Safefree(buf);
+{
+ dXSTARG;
+ char *path;
+ char buf[MAXPATHLEN];
+
+ path = pathsv ? SvPV_nolen(pathsv) : ".";
+
+ if (bsd_realpath(path, buf)) {
+ sv_setpvn(TARG, buf, strlen(buf));
+ SvPOK_only(TARG);
+ SvTAINTED_on(TARG);
}
else
- XSRETURN_UNDEF;
+ sv_setsv(TARG, &PL_sv_undef);
+
+ XSprePUSH; PUSHTARG;
+#ifndef INCOMPLETE_TAINTS
+ SvTAINTED_on(TARG);
+#endif
+}
projects / p5sagit/p5-mst-13.2.git / blobdiff