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Diffstat (limited to '20120831/realpath.c')
| -rw-r--r-- | 20120831/realpath.c | 196 |
1 files changed, 0 insertions, 196 deletions
diff --git a/20120831/realpath.c b/20120831/realpath.c deleted file mode 100644 index 1ef2cd8..0000000 --- a/20120831/realpath.c +++ /dev/null @@ -1,196 +0,0 @@ -/* $Id: realpath.c,v 1.2 2010/04/21 17:47:49 sjg Exp $ */ -/* from: $NetBSD: getcwd.c,v 1.45 2007/10/26 19:48:14 christos Exp $ */ - -/* - * Copyright (c) 1989, 1991, 1993, 1995 - * 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. 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. - */ -#ifdef HAVE_CONFIG_H -# include <config.h> -#endif -#ifndef HAVE_REALPATH - -#include <sys/cdefs.h> -#include <sys/param.h> -#include <sys/stat.h> - -#include <errno.h> -#ifdef HAVE_STDLIB_H -# include <stdlib.h> -#endif -#ifdef HAVE_STRING_H -# include <string.h> -#endif -#ifdef HAVE_UNISTD_H -# include <unistd.h> -#endif - -/* - * char *realpath(const char *path, char resolved[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). - */ -char * -realpath(const char *path, char *resolved) -{ - struct stat sb; - int idx = 0, n, nlnk = 0; - const char *q; - char *p, wbuf[2][MAXPATHLEN]; - size_t len; - - if (!path || !resolved || path == resolved) - return (NULL); - - /* - * Build real path one by one with paying an attention to ., - * .. and symbolic link. - */ - - /* - * `p' is where we'll put a new component with prepending - * a delimiter. - */ - p = resolved; - - if (*path == 0) { - *p = 0; - errno = ENOENT; - return (NULL); - } - - /* If relative path, start from current working directory. */ - if (*path != '/') { - /* check for resolved pointer to appease coverity */ - if (resolved && getcwd(resolved, MAXPATHLEN) == NULL) { - p[0] = '.'; - p[1] = 0; - return (NULL); - } - len = strlen(resolved); - if (len > 1) - p += len; - } - -loop: - /* Skip any slash. */ - while (*path == '/') - path++; - - if (*path == 0) { - if (p == resolved) - *p++ = '/'; - *p = 0; - return (resolved); - } - - /* Find the end of this component. */ - q = path; - do - q++; - while (*q != '/' && *q != 0); - - /* Test . or .. */ - if (path[0] == '.') { - if (q - path == 1) { - path = q; - goto loop; - } - if (path[1] == '.' && q - path == 2) { - /* Trim the last component. */ - if (p != resolved) - while (*--p != '/') - ; - path = q; - goto loop; - } - } - - /* Append this component. */ - if (p - resolved + 1 + q - path + 1 > MAXPATHLEN) { - errno = ENAMETOOLONG; - if (p == resolved) - *p++ = '/'; - *p = 0; - return (NULL); - } - p[0] = '/'; - memcpy(&p[1], path, - /* LINTED We know q > path. */ - q - path); - p[1 + q - path] = 0; - - /* - * If this component is a symlink, toss it and prepend link - * target to unresolved path. - */ - if (lstat(resolved, &sb) == -1) { - return (NULL); - } - if (S_ISLNK(sb.st_mode)) { - if (nlnk++ >= MAXSYMLINKS) { - errno = ELOOP; - return (NULL); - } - n = readlink(resolved, wbuf[idx], sizeof(wbuf[0]) - 1); - if (n < 0) - return (NULL); - if (n == 0) { - errno = ENOENT; - return (NULL); - } - - /* Append unresolved path to link target and switch to it. */ - if (n + (len = strlen(q)) + 1 > sizeof(wbuf[0])) { - errno = ENAMETOOLONG; - return (NULL); - } - memcpy(&wbuf[idx][n], q, len + 1); - path = wbuf[idx]; - idx ^= 1; - - /* If absolute symlink, start from root. */ - if (*path == '/') - p = resolved; - goto loop; - } - if (*q == '/' && !S_ISDIR(sb.st_mode)) { - errno = ENOTDIR; - return (NULL); - } - - /* Advance both resolved and unresolved path. */ - p += 1 + q - path; - path = q; - goto loop; -} -#endif |
