зеркало из https://github.com/mozilla/pjs.git
303 строки
6.8 KiB
C
303 строки
6.8 KiB
C
/*
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* The contents of this file are subject to the Mozilla Public
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* rights and limitations under the License.
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*
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* The Original Code is the Netscape security libraries.
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*
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* The Initial Developer of the Original Code is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1994-2000 Netscape Communications Corporation. All
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* Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the
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* terms of the GNU General Public License Version 2 or later (the
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* "GPL"), in which case the provisions of the GPL are applicable
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* instead of those above. If you wish to allow use of your
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* version of this file only under the terms of the GPL and not to
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* allow others to use your version of this file under the MPL,
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* indicate your decision by deleting the provisions above and
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* replace them with the notice and other provisions required by
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* the GPL. If you do not delete the provisions above, a recipient
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* may use your version of this file under either the MPL or the
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* GPL.
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*/
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/*
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** Pathname subroutines.
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*/
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#include <assert.h>
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#ifdef FREEBSD
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#include <sys/types.h>
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#endif /* FREEBSD */
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#include <dirent.h>
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#include <errno.h>
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#include <stdarg.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include "pathsub.h"
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#ifdef USE_REENTRANT_LIBC
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#include "libc_r.h"
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#endif /* USE_REENTRANT_LIBC */
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char *program;
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void
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fail(char *format, ...)
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{
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int error;
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va_list ap;
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#ifdef USE_REENTRANT_LIBC
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R_STRERROR_INIT_R();
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#endif
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error = errno;
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fprintf(stderr, "%s: ", program);
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va_start(ap, format);
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vfprintf(stderr, format, ap);
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va_end(ap);
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if (error)
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#ifdef USE_REENTRANT_LIBC
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R_STRERROR_R(errno);
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fprintf(stderr, ": %s", r_strerror_r);
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#else
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fprintf(stderr, ": %s", strerror(errno));
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#endif
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putc('\n', stderr);
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abort();
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exit(1);
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}
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char *
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getcomponent(char *path, char *name)
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{
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if (*path == '\0')
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return 0;
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if (*path == '/') {
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*name++ = '/';
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} else {
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do {
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*name++ = *path++;
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} while (*path != '/' && *path != '\0');
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}
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*name = '\0';
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while (*path == '/')
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path++;
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return path;
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}
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#ifdef UNIXWARE
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/* The static buffer in Unixware's readdir is too small. */
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struct dirent * readdir(DIR *d)
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{
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static struct dirent *buf = NULL;
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#define MAX_PATH_LEN 1024
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if (buf == NULL)
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buf = (struct dirent *)xmalloc(sizeof(struct dirent) + MAX_PATH_LEN) ;
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return readdir_r(d, buf);
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}
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#endif
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/* APPARENT BUG - ignores argument "dir", uses ".." instead. */
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char *
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ino2name(ino_t ino, char *dir)
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{
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DIR *dp;
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struct dirent *ep;
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char *name;
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dp = opendir(".."); /* XXX */
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if (!dp)
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fail("cannot read parent directory");
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for (;;) {
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if (!(ep = readdir(dp)))
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fail("cannot find current directory");
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if (ep->d_ino == ino)
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break;
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}
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name = xstrdup(ep->d_name);
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closedir(dp);
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return name;
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}
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void *
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xmalloc(size_t size)
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{
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void *p;
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if (size <= 0)
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fail("attempted to allocate %u bytes", size);
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p = malloc(size);
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if (!p)
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fail("cannot allocate %u bytes", size);
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return p;
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}
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char *
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xstrdup(char *s)
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{
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if (!s || !s[0])
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fail("Null pointer or empty string passed to xstrdup()");
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return strcpy((char*)xmalloc(strlen(s) + 1), s);
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}
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char *
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xbasename(char *path)
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{
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char *cp;
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if (!path || !path[0])
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fail("Null pointer or empty string passed to xbasename()");
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while ((cp = strrchr(path, '/')) && cp[1] == '\0')
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*cp = '\0';
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if (!cp) return path;
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return cp + 1;
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}
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void
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xchdir(char *dir)
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{
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if (!dir || !dir[0])
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fail("Null pointer or empty string passed to xchdir()");
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if (chdir(dir) < 0)
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fail("cannot change directory to %s", dir);
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}
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int
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relatepaths(char *from, char *to, char *outpath)
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{
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char *cp, *cp2;
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int len;
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char buf[NAME_MAX];
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assert(*from == '/' && *to == '/');
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if (!from || *from != '/')
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fail("relatepaths: from path does not start with /");
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if (!to || *to != '/')
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fail("relatepaths: to path does not start with /");
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for (cp = to, cp2 = from; *cp == *cp2; cp++, cp2++)
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if (*cp == '\0')
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break;
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while (cp[-1] != '/')
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cp--, cp2--;
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if (cp - 1 == to) {
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/* closest common ancestor is /, so use full pathname */
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len = strlen(strcpy(outpath, to));
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if (outpath[len] != '/') {
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outpath[len++] = '/';
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outpath[len] = '\0';
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}
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} else {
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len = 0;
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while ((cp2 = getcomponent(cp2, buf)) != 0) {
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strcpy(outpath + len, "../");
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len += 3;
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}
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while ((cp = getcomponent(cp, buf)) != 0) {
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sprintf(outpath + len, "%s/", buf);
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len += strlen(outpath + len);
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}
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}
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return len;
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}
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void
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reversepath(char *inpath, char *name, int len, char *outpath)
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{
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char *cp, *cp2;
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char buf[NAME_MAX];
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struct stat sb;
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cp = strcpy(outpath + PATH_MAX - (len + 1), name);
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cp2 = inpath;
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while ((cp2 = getcomponent(cp2, buf)) != 0) {
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if (strcmp(buf, ".") == 0)
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continue;
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if (strcmp(buf, "..") == 0) {
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if (stat(".", &sb) < 0)
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fail("cannot stat current directory");
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name = ino2name(sb.st_ino, "..");
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len = strlen(name);
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cp -= len + 1;
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strcpy(cp, name);
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cp[len] = '/';
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free(name);
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xchdir("..");
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} else {
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cp -= 3;
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strncpy(cp, "../", 3);
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xchdir(buf);
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}
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}
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strcpy(outpath, cp);
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}
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void
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diagnosePath(const char * path)
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{
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char * myPath;
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char * slash;
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int rv;
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struct stat sb;
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char buf[BUFSIZ];
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if (!path || !path[0])
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fail("Null pointer or empty string passed to mkdirs()");
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myPath = strdup(path);
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if (!myPath)
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fail("strdup() failed!");
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do {
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rv = lstat(myPath, &sb);
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if (rv < 0) {
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perror(myPath);
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} else if (S_ISLNK(sb.st_mode)) {
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rv = readlink(myPath, buf, sizeof buf);
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if (rv < 0) {
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perror("readlink");
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buf[0] = 0;
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} else {
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buf[rv] = 0;
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}
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fprintf(stderr, "%s is a link to %s\n", myPath, buf);
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} else if (S_ISDIR(sb.st_mode)) {
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fprintf(stderr, "%s is a directory\n", myPath);
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rv = access(myPath, X_OK);
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if (rv < 0) {
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fprintf(stderr, "%s: no search permission\n", myPath);
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}
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} else {
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fprintf(stderr, "%s is a file !?!\n", myPath);
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rv = access(myPath, F_OK);
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if (rv < 0) {
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fprintf(stderr, "%s does not exist\n", myPath);
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}
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}
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/* chop path off one level. */
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slash = strrchr(myPath, '/');
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if (!slash)
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slash = strrchr(myPath, '\\');
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if (!slash)
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slash = myPath;
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*slash = 0;
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} while (myPath[0]);
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free(myPath);
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}
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