pathsub.c
上传用户:lyxiangda
上传日期:2007-01-12
资源大小:3042k
文件大小:7k
- /*
- * The contents of this file are subject to the Mozilla Public
- * License Version 1.1 (the "License"); you may not use this file
- * except in compliance with the License. You may obtain a copy of
- * the License at http://www.mozilla.org/MPL/
- *
- * Software distributed under the License is distributed on an "AS
- * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
- * implied. See the License for the specific language governing
- * rights and limitations under the License.
- *
- * The Original Code is the Netscape security libraries.
- *
- * The Initial Developer of the Original Code is Netscape
- * Communications Corporation. Portions created by Netscape are
- * Copyright (C) 1994-2000 Netscape Communications Corporation. All
- * Rights Reserved.
- *
- * Contributor(s):
- *
- * Alternatively, the contents of this file may be used under the
- * terms of the GNU General Public License Version 2 or later (the
- * "GPL"), in which case the provisions of the GPL are applicable
- * instead of those above. If you wish to allow use of your
- * version of this file only under the terms of the GPL and not to
- * allow others to use your version of this file under the MPL,
- * indicate your decision by deleting the provisions above and
- * replace them with the notice and other provisions required by
- * the GPL. If you do not delete the provisions above, a recipient
- * may use your version of this file under either the MPL or the
- * GPL.
- */
- /*
- ** Pathname subroutines.
- */
- #include <assert.h>
- #ifdef FREEBSD
- #include <sys/types.h>
- #endif /* FREEBSD */
- #include <dirent.h>
- #include <errno.h>
- #include <stdarg.h>
- #include <stdio.h>
- #include <stdlib.h>
- #include <string.h>
- #include <unistd.h>
- #include <sys/types.h>
- #include <sys/stat.h>
- #include "pathsub.h"
- #ifdef USE_REENTRANT_LIBC
- #include "libc_r.h"
- #endif /* USE_REENTRANT_LIBC */
- char *program;
- void
- fail(char *format, ...)
- {
- int error;
- va_list ap;
- #ifdef USE_REENTRANT_LIBC
- R_STRERROR_INIT_R();
- #endif
- error = errno;
- fprintf(stderr, "%s: ", program);
- va_start(ap, format);
- vfprintf(stderr, format, ap);
- va_end(ap);
- if (error)
- #ifdef USE_REENTRANT_LIBC
- R_STRERROR_R(errno);
- fprintf(stderr, ": %s", r_strerror_r);
- #else
- fprintf(stderr, ": %s", strerror(errno));
- #endif
- putc('n', stderr);
- abort();
- exit(1);
- }
- char *
- getcomponent(char *path, char *name)
- {
- if (*path == ' ')
- return 0;
- if (*path == '/') {
- *name++ = '/';
- } else {
- do {
- *name++ = *path++;
- } while (*path != '/' && *path != ' ');
- }
- *name = ' ';
- while (*path == '/')
- path++;
- return path;
- }
- #ifdef UNIXWARE
- /* The static buffer in Unixware's readdir is too small. */
- struct dirent * readdir(DIR *d)
- {
- static struct dirent *buf = NULL;
- #define MAX_PATH_LEN 1024
- if (buf == NULL)
- buf = (struct dirent *)xmalloc(sizeof(struct dirent) + MAX_PATH_LEN) ;
- return readdir_r(d, buf);
- }
- #endif
- /* APPARENT BUG - ignores argument "dir", uses ".." instead. */
- char *
- ino2name(ino_t ino, char *dir)
- {
- DIR *dp;
- struct dirent *ep;
- char *name;
- dp = opendir(".."); /* XXX */
- if (!dp)
- fail("cannot read parent directory");
- for (;;) {
- if (!(ep = readdir(dp)))
- fail("cannot find current directory");
- if (ep->d_ino == ino)
- break;
- }
- name = xstrdup(ep->d_name);
- closedir(dp);
- return name;
- }
- void *
- xmalloc(size_t size)
- {
- void *p;
- if (size <= 0)
- fail("attempted to allocate %u bytes", size);
- p = malloc(size);
- if (!p)
- fail("cannot allocate %u bytes", size);
- return p;
- }
- char *
- xstrdup(char *s)
- {
- if (!s || !s[0])
- fail("Null pointer or empty string passed to xstrdup()");
- return strcpy((char*)xmalloc(strlen(s) + 1), s);
- }
- char *
- xbasename(char *path)
- {
- char *cp;
- if (!path || !path[0])
- fail("Null pointer or empty string passed to xbasename()");
- while ((cp = strrchr(path, '/')) && cp[1] == ' ')
- *cp = ' ';
- if (!cp) return path;
- return cp + 1;
- }
- void
- xchdir(char *dir)
- {
- if (!dir || !dir[0])
- fail("Null pointer or empty string passed to xchdir()");
- if (chdir(dir) < 0)
- fail("cannot change directory to %s", dir);
- }
- int
- relatepaths(char *from, char *to, char *outpath)
- {
- char *cp, *cp2;
- int len;
- char buf[NAME_MAX];
- assert(*from == '/' && *to == '/');
- if (!from || *from != '/')
- fail("relatepaths: from path does not start with /");
- if (!to || *to != '/')
- fail("relatepaths: to path does not start with /");
- for (cp = to, cp2 = from; *cp == *cp2; cp++, cp2++)
- if (*cp == ' ')
- break;
- while (cp[-1] != '/')
- cp--, cp2--;
- if (cp - 1 == to) {
- /* closest common ancestor is /, so use full pathname */
- len = strlen(strcpy(outpath, to));
- if (outpath[len] != '/') {
- outpath[len++] = '/';
- outpath[len] = ' ';
- }
- } else {
- len = 0;
- while ((cp2 = getcomponent(cp2, buf)) != 0) {
- strcpy(outpath + len, "../");
- len += 3;
- }
- while ((cp = getcomponent(cp, buf)) != 0) {
- sprintf(outpath + len, "%s/", buf);
- len += strlen(outpath + len);
- }
- }
- return len;
- }
- void
- reversepath(char *inpath, char *name, int len, char *outpath)
- {
- char *cp, *cp2;
- char buf[NAME_MAX];
- struct stat sb;
- cp = strcpy(outpath + PATH_MAX - (len + 1), name);
- cp2 = inpath;
- while ((cp2 = getcomponent(cp2, buf)) != 0) {
- if (strcmp(buf, ".") == 0)
- continue;
- if (strcmp(buf, "..") == 0) {
- if (stat(".", &sb) < 0)
- fail("cannot stat current directory");
- name = ino2name(sb.st_ino, "..");
- len = strlen(name);
- cp -= len + 1;
- strcpy(cp, name);
- cp[len] = '/';
- free(name);
- xchdir("..");
- } else {
- cp -= 3;
- strncpy(cp, "../", 3);
- xchdir(buf);
- }
- }
- strcpy(outpath, cp);
- }
- void
- diagnosePath(const char * path)
- {
- char * myPath;
- char * slash;
- int rv;
- struct stat sb;
- char buf[BUFSIZ];
- if (!path || !path[0])
- fail("Null pointer or empty string passed to mkdirs()");
- myPath = strdup(path);
- if (!myPath)
- fail("strdup() failed!");
- do {
- rv = lstat(myPath, &sb);
- if (rv < 0) {
- perror(myPath);
- } else if (S_ISLNK(sb.st_mode)) {
- rv = readlink(myPath, buf, sizeof buf);
- if (rv < 0) {
- perror("readlink");
- buf[0] = 0;
- } else {
- buf[rv] = 0;
- }
- fprintf(stderr, "%s is a link to %sn", myPath, buf);
- } else if (S_ISDIR(sb.st_mode)) {
- fprintf(stderr, "%s is a directoryn", myPath);
- rv = access(myPath, X_OK);
- if (rv < 0) {
- fprintf(stderr, "%s: no search permissionn", myPath);
- }
- } else {
- fprintf(stderr, "%s is a file !?!n", myPath);
- rv = access(myPath, F_OK);
- if (rv < 0) {
- fprintf(stderr, "%s does not existn", myPath);
- }
- }
- /* chop path off one level. */
- slash = strrchr(myPath, '/');
- if (!slash)
- slash = strrchr(myPath, '\');
- if (!slash)
- slash = myPath;
- *slash = 0;
- } while (myPath[0]);
- free(myPath);
- }