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/* Copyright (c) 1993, 1994 Washington University in Saint Louis
* All rights reserved.
*
* 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
* Washington University in Saint Louis 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 WASHINGTON UNIVERSITY 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 WASHINGTON
* UNIVERSITY 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.
*/
#ifndef lint
static char rcsid[] = "@(#)$Id: realpath.c,v 1.8 1997/01/16 09:54:38 sob Exp $";
#endif
#include "config.h"
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/param.h>
#include <string.h>
#ifndef HAVE_SYMLINK
#define lstat stat
#endif
char *
#ifdef __STDC__
realpath(const char *pathname, char *result)
#else
realpath(pathname,result)
char *pathname;
char *result;
#endif
{
struct stat sbuf;
char curpath[MAXPATHLEN],
workpath[MAXPATHLEN],
linkpath[MAXPATHLEN],
namebuf[MAXPATHLEN],
*where,
*ptr,
*last;
int len;
/* check arguments! */
if (result == NULL) /* result must not be null! */
return(NULL);
if(pathname == NULL){ /* if pathname is null, there is nothing to do */
*result = '\0';
return(NULL);
}
strcpy(curpath, pathname);
if (*pathname != '/') {
uid_t userid;
#ifdef HAVE_GETCWD
if (!getcwd(workpath,MAXPATHLEN)) {
#else
if (!getwd(workpath)) {
#endif
userid = geteuid();
delay_signaling(); /* we can't allow any signals while euid==0: kinch */
seteuid(0);
#ifdef HAVE_GETCWD
if (!getcwd(workpath,MAXPATHLEN)) {
#else
if (!getwd(workpath)) {
#endif
strcpy(result, ".");
seteuid(userid);
enable_signaling(); /* we can allow signals once again: kinch */
return (NULL);
}
seteuid(userid);
enable_signaling(); /* we can allow signals once again: kinch */
}
} else
*workpath = '\0';
/* curpath is the path we're still resolving */
/* linkpath is the path a symbolic link points to */
/* workpath is the path we've resolved */
loop:
where = curpath;
while (*where != '\0') {
if (!strcmp(where, ".")) {
where++;
continue;
}
/* deal with "./" */
if (!strncmp(where, "./", 2)) {
where += 2;
continue;
}
/* deal with "../" */
if (!strncmp(where, "../", 3)) {
where += 3;
ptr = last = workpath;
while (*ptr != '\0') {
if (*ptr == '/')
last = ptr;
ptr++;
}
*last = '\0';
continue;
}
ptr = strchr(where, '/');
if (ptr == (char *)NULL)
ptr = where + strlen(where) - 1;
else
*ptr = '\0';
strcpy(namebuf, workpath);
for (last = namebuf; *last; last++)
continue;
if (*--last != '/')
strcat(namebuf, "/");
strcat(namebuf, where);
where = ++ptr;
if (lstat(namebuf, &sbuf) == -1) {
strcpy(result, namebuf);
return (NULL);
}
/* was IFLNK */
#ifdef HAVE_SYMLINK
if ((sbuf.st_mode & S_IFMT) == S_IFLNK) {
len = readlink(namebuf, linkpath, MAXPATHLEN);
if (len == 0) {
strcpy(result, namebuf);
return (NULL);
}
*(linkpath + len) = '\0'; /* readlink doesn't null-terminate
* result */
if (*linkpath == '/')
*workpath = '\0';
if (*where) {
strcat(linkpath, "/");
strcat(linkpath, where);
}
strcpy(curpath, linkpath);
goto loop;
}
#endif
if ((sbuf.st_mode & S_IFDIR) == S_IFDIR) {
strcpy(workpath, namebuf);
continue;
}
if (*where) {
strcpy(result, namebuf);
return (NULL); /* path/notadir/morepath */
} else
strcpy(workpath, namebuf);
}
strcpy(result, workpath);
return (result);
}
These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.