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|
#include "EXTERN.h"
#include "perl.h"
#include "XSUB.h"
#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 *
bsd_realpath(path, resolved)
const char *path;
char *resolved;
{
#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 (getcwd(wd, MAXPATHLEN - 1) == NULL) {
(void)strcpy(resolved, ".");
return (NULL);
}
#endif
/*
* 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 = "";
}
}
}
#endif
/*
* 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 (chdir(wd) < 0) {
serrno = errno;
goto err2;
}
#endif
/* It's okay if the close fails, what's an fd more or less? */
#ifdef HAS_FCHDIR
(void)close(fd);
#endif
return (resolved);
err1: serrno = errno;
#ifdef HAS_FCHDIR
(void)fchdir(fd);
#else
(void)chdir(wd);
#endif
err2:
#ifdef HAS_FCHDIR
(void)close(fd);
#endif
errno = serrno;
return (NULL);
#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
abs_path(pathsv=Nullsv)
SV *pathsv
PPCODE:
{
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
sv_setsv(TARG, &PL_sv_undef);
XSprePUSH; PUSHTARG;
#ifndef INCOMPLETE_TAINTS
SvTAINTED_on(TARG);
#endif
}
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