00001 /*- 00002 * See the file LICENSE for redistribution information. 00003 * 00004 * Copyright (c) 1996, 1997, 1998, 1999 00005 * Sleepycat Software. All rights reserved. 00006 */ 00007 /* 00008 * Copyright (c) 1989, 1991, 1993 00009 * The Regents of the University of California. All rights reserved. 00010 * 00011 * Redistribution and use in source and binary forms, with or without 00012 * modification, are permitted provided that the following conditions 00013 * are met: 00014 * 1. Redistributions of source code must retain the above copyright 00015 * notice, this list of conditions and the following disclaimer. 00016 * 2. Redistributions in binary form must reproduce the above copyright 00017 * notice, this list of conditions and the following disclaimer in the 00018 * documentation and/or other materials provided with the distribution. 00019 * 3. Neither the name of the University nor the names of its contributors 00020 * may be used to endorse or promote products derived from this software 00021 * without specific prior written permission. 00022 * 00023 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 00024 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 00025 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 00026 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 00027 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 00028 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 00029 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 00030 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 00031 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 00032 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 00033 * SUCH DAMAGE. 00034 */ 00035 00036 #ifdef HAVE_CONFIG_H 00037 #include "config.h" 00038 #endif /* HAVE_CONFIG_H */ 00039 00040 #include <sys/types.h> 00041 #include <sys/stat.h> 00042 00043 #if HAVE_DIRENT_H 00044 # include <dirent.h> 00045 # define NAMLEN(dirent) strlen((dirent)->d_name) 00046 #else 00047 # define dirent direct 00048 # define NAMLEN(dirent) (dirent)->d_namlen 00049 # if HAVE_SYS_NDIR_H 00050 # include <sys/ndir.h> 00051 # endif 00052 # if HAVE_SYS_DIR_H 00053 # include <sys/dir.h> 00054 # endif 00055 # if HAVE_NDIR_H 00056 # include <ndir.h> 00057 # endif 00058 #endif 00059 00060 #include <errno.h> 00061 #include <stdio.h> 00062 #include <stdlib.h> 00063 #include <string.h> 00064 #include <unistd.h> 00065 00066 #ifndef HAVE_GETCWD 00067 00068 #define ISDOT(dp) \ 00069 (dp->d_name[0] == '.' && (dp->d_name[1] == '0円' || \ 00070 (dp->d_name[1] == '.' && dp->d_name[2] == '0円'))) 00071 00072 #ifndef dirfd 00073 #define dirfd(dirp) ((dirp)->dd_fd) 00074 #endif 00075 00076 /* 00077 * getcwd -- 00078 * Get the current working directory. 00079 * 00080 * PUBLIC: #ifndef HAVE_GETCWD 00081 * PUBLIC: char *getcwd __P((char *, size_t)); 00082 * PUBLIC: #endif 00083 */ 00084 char * 00085 getcwd(pt, size) 00086 char *pt; 00087 size_t size; 00088 { 00089 register struct dirent *dp; 00090 register DIR *dir; 00091 register dev_t dev; 00092 register ino_t ino; 00093 register int first; 00094 register char *bpt, *bup; 00095 struct stat s; 00096 dev_t root_dev; 00097 ino_t root_ino; 00098 size_t ptsize, upsize; 00099 int ret, save_errno; 00100 char *ept, *eup, *up; 00101 00102 /* 00103 * If no buffer specified by the user, allocate one as necessary. 00104 * If a buffer is specified, the size has to be non-zero. The path 00105 * is built from the end of the buffer backwards. 00106 */ 00107 if (pt) { 00108 ptsize = 0; 00109 if (!size) { 00110 __os_set_errno(EINVAL); 00111 return (NULL); 00112 } 00113 if (size == 1) { 00114 __os_set_errno(ERANGE); 00115 return (NULL); 00116 } 00117 ept = pt + size; 00118 } else { 00119 if ((ret = __os_malloc(ptsize = 1024 - 4, NULL, &pt)) != 0) { 00120 __os_set_errno(ret); 00121 return (NULL); 00122 } 00123 ept = pt + ptsize; 00124 } 00125 bpt = ept - 1; 00126 *bpt = '0円'; 00127 00128 /* 00129 * Allocate bytes (1024 - malloc space) for the string of "../"'s. 00130 * Should always be enough (it's 340 levels). If it's not, allocate 00131 * as necessary. Special case the first stat, it's ".", not "..". 00132 */ 00133 if ((ret = __os_malloc(upsize = 1024 - 4, NULL, &up)) != 0) 00134 goto err; 00135 eup = up + 1024; 00136 bup = up; 00137 up[0] = '.'; 00138 up[1] = '0円'; 00139 00140 /* Save root values, so know when to stop. */ 00141 if (stat("/", &s)) 00142 goto err; 00143 root_dev = s.st_dev; 00144 root_ino = s.st_ino; 00145 00146 __os_set_errno(0); /* XXX readdir has no error return. */ 00147 00148 for (first = 1;; first = 0) { 00149 /* Stat the current level. */ 00150 if (lstat(up, &s)) 00151 goto err; 00152 00153 /* Save current node values. */ 00154 ino = s.st_ino; 00155 dev = s.st_dev; 00156 00157 /* Check for reaching root. */ 00158 if (root_dev == dev && root_ino == ino) { 00159 *--bpt = PATH_SEPARATOR[0]; 00160 /* 00161 * It's unclear that it's a requirement to copy the 00162 * path to the beginning of the buffer, but it's always 00163 * been that way and stuff would probably break. 00164 */ 00165 bcopy(bpt, pt, ept - bpt); 00166 __os_free(up, upsize); 00167 return (pt); 00168 } 00169 00170 /* 00171 * Build pointer to the parent directory, allocating memory 00172 * as necessary. Max length is 3 for "../", the largest 00173 * possible component name, plus a trailing NULL. 00174 */ 00175 if (bup + 3 + MAXNAMLEN + 1 >= eup) { 00176 if (__os_realloc(upsize *= 2, NULL, &up) != 0) 00177 goto err; 00178 bup = up; 00179 eup = up + upsize; 00180 } 00181 *bup++ = '.'; 00182 *bup++ = '.'; 00183 *bup = '0円'; 00184 00185 /* Open and stat parent directory. */ 00186 if (!(dir = opendir(up)) || fstat(dirfd(dir), &s)) 00187 goto err; 00188 00189 /* Add trailing slash for next directory. */ 00190 *bup++ = PATH_SEPARATOR[0]; 00191 00192 /* 00193 * If it's a mount point, have to stat each element because 00194 * the inode number in the directory is for the entry in the 00195 * parent directory, not the inode number of the mounted file. 00196 */ 00197 save_errno = 0; 00198 if (s.st_dev == dev) { 00199 for (;;) { 00200 if (!(dp = readdir(dir))) 00201 goto notfound; 00202 if (dp->d_fileno == ino) 00203 break; 00204 } 00205 } else 00206 for (;;) { 00207 if (!(dp = readdir(dir))) 00208 goto notfound; 00209 if (ISDOT(dp)) 00210 continue; 00211 bcopy(dp->d_name, bup, dp->d_namlen + 1); 00212 00213 /* Save the first error for later. */ 00214 if (lstat(up, &s)) { 00215 if (save_errno == 0) 00216 save_errno = __os_get_errno(); 00217 __os_set_errno(0); 00218 continue; 00219 } 00220 if (s.st_dev == dev && s.st_ino == ino) 00221 break; 00222 } 00223 00224 /* 00225 * Check for length of the current name, preceding slash, 00226 * leading slash. 00227 */ 00228 if (bpt - pt < dp->d_namlen + (first ? 1 : 2)) { 00229 size_t len, off; 00230 00231 if (!ptsize) { 00232 __os_set_errno(ERANGE); 00233 goto err; 00234 } 00235 off = bpt - pt; 00236 len = ept - bpt; 00237 if (__os_realloc(ptsize *= 2, NULL, &pt) != 0) 00238 goto err; 00239 bpt = pt + off; 00240 ept = pt + ptsize; 00241 bcopy(bpt, ept - len, len); 00242 bpt = ept - len; 00243 } 00244 if (!first) 00245 *--bpt = PATH_SEPARATOR[0]; 00246 bpt -= dp->d_namlen; 00247 bcopy(dp->d_name, bpt, dp->d_namlen); 00248 (void)closedir(dir); 00249 00250 /* Truncate any file name. */ 00251 *bup = '0円'; 00252 } 00253 00254 notfound: 00255 /* 00256 * If readdir set errno, use it, not any saved error; otherwise, 00257 * didn't find the current directory in its parent directory, set 00258 * errno to ENOENT. 00259 */ 00260 if (__os_get_errno() == 0) 00261 __os_set_errno(save_errno == 0 ? ENOENT : save_errno); 00262 /* FALLTHROUGH */ 00263 err: 00264 if (ptsize) 00265 __os_free(pt, ptsize); 00266 __os_free(up, upsize); 00267 return (NULL); 00268 } 00269 #endif /* HAVE_GETCWD */