1 /* 2 * get_pathname.c --- do directry/inode -> name translation 3 * 4 * Copyright (C) 1993, 1994, 1995 Theodore Ts'o. 5 * 6 * %Begin-Header% 7 * This file may be redistributed under the terms of the GNU Library 8 * General Public License, version 2. 9 * %End-Header% 10 */ 11 12 /* 13 * 14 * ext2fs_get_pathname(fs, dir, ino, name) 15 * 16 * This function translates takes two inode numbers into a 17 * string, placing the result in <name>. <dir> is the containing 18 * directory inode, and <ino> is the inode number itself. If 19 * <ino> is zero, then ext2fs_get_pathname will return pathname 20 * of the the directory <dir>. 21 * 22 */ 23 24 #include <stdio.h> 25 #include <string.h> 26 #if HAVE_UNISTD_H 27 #include <unistd.h> 28 #endif 29 30 #include "ext2_fs.h" 31 #include "ext2fs.h" 32 33 struct get_pathname_struct { 34 ext2_ino_t search_ino; 35 ext2_ino_t parent; 36 char *name; 37 errcode_t errcode; 38 }; 39 40 #ifdef __TURBOC__ 41 #pragma argsused 42 #endif 43 static int get_pathname_proc(struct ext2_dir_entry *dirent, 44 int offset EXT2FS_ATTR((unused)), 45 int blocksize EXT2FS_ATTR((unused)), 46 char *buf EXT2FS_ATTR((unused)), 47 void *priv_data) 48 { 49 struct get_pathname_struct *gp; 50 errcode_t retval; 51 52 gp = (struct get_pathname_struct *) priv_data; 53 54 if (((dirent->name_len & 0xFF) == 2) && 55 !strncmp(dirent->name, "..", 2)) 56 gp->parent = dirent->inode; 57 if (dirent->inode == gp->search_ino) { 58 retval = ext2fs_get_mem((dirent->name_len & 0xFF) + 1, 59 &gp->name); 60 if (retval) { 61 gp->errcode = retval; 62 return DIRENT_ABORT; 63 } 64 strncpy(gp->name, dirent->name, (dirent->name_len & 0xFF)); 65 gp->name[dirent->name_len & 0xFF] = '\0'; 66 return DIRENT_ABORT; 67 } 68 return 0; 69 } 70 71 static errcode_t ext2fs_get_pathname_int(ext2_filsys fs, ext2_ino_t dir, 72 ext2_ino_t ino, int maxdepth, 73 char *buf, char **name) 74 { 75 struct get_pathname_struct gp; 76 char *parent_name = 0, *ret; 77 errcode_t retval; 78 79 if (dir == ino) { 80 retval = ext2fs_get_mem(2, name); 81 if (retval) 82 return retval; 83 strcpy(*name, (dir == EXT2_ROOT_INO) ? "/" : "."); 84 return 0; 85 } 86 87 if (!dir || (maxdepth < 0)) { 88 retval = ext2fs_get_mem(4, name); 89 if (retval) 90 return retval; 91 strcpy(*name, "..."); 92 return 0; 93 } 94 95 gp.search_ino = ino; 96 gp.parent = 0; 97 gp.name = 0; 98 gp.errcode = 0; 99 100 retval = ext2fs_dir_iterate(fs, dir, 0, buf, get_pathname_proc, &gp); 101 if (retval == EXT2_ET_NO_DIRECTORY) { 102 char tmp[32]; 103 104 if (ino) 105 snprintf(tmp, sizeof(tmp), "<%u>/<%u>", dir, ino); 106 else 107 snprintf(tmp, sizeof(tmp), "<%u>", dir); 108 retval = ext2fs_get_mem(strlen(tmp)+1, name); 109 if (retval) 110 goto cleanup; 111 strcpy(*name, tmp); 112 return 0; 113 } else if (retval) 114 goto cleanup; 115 if (gp.errcode) { 116 retval = gp.errcode; 117 goto cleanup; 118 } 119 120 retval = ext2fs_get_pathname_int(fs, gp.parent, dir, maxdepth-1, 121 buf, &parent_name); 122 if (retval) 123 goto cleanup; 124 if (!ino) { 125 *name = parent_name; 126 return 0; 127 } 128 129 if (gp.name) 130 retval = ext2fs_get_mem(strlen(parent_name)+strlen(gp.name)+2, 131 &ret); 132 else 133 retval = ext2fs_get_mem(strlen(parent_name)+5, &ret); 134 if (retval) 135 goto cleanup; 136 137 ret[0] = 0; 138 if (parent_name[1]) 139 strcat(ret, parent_name); 140 strcat(ret, "/"); 141 if (gp.name) 142 strcat(ret, gp.name); 143 else 144 strcat(ret, "???"); 145 *name = ret; 146 retval = 0; 147 148 cleanup: 149 ext2fs_free_mem(&parent_name); 150 ext2fs_free_mem(&gp.name); 151 return retval; 152 } 153 154 errcode_t ext2fs_get_pathname(ext2_filsys fs, ext2_ino_t dir, ext2_ino_t ino, 155 char **name) 156 { 157 char *buf; 158 errcode_t retval; 159 160 EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS); 161 162 retval = ext2fs_get_mem(fs->blocksize, &buf); 163 if (retval) 164 return retval; 165 if (dir == ino) 166 ino = 0; 167 retval = ext2fs_get_pathname_int(fs, dir, ino, 32, buf, name); 168 ext2fs_free_mem(&buf); 169 return retval; 170 171 } 172
