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, *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) 102 goto cleanup; 103 if (gp.errcode) { 104 retval = gp.errcode; 105 goto cleanup; 106 } 107 108 retval = ext2fs_get_pathname_int(fs, gp.parent, dir, maxdepth-1, 109 buf, &parent_name); 110 if (retval) 111 goto cleanup; 112 if (!ino) { 113 *name = parent_name; 114 return 0; 115 } 116 117 if (gp.name) 118 retval = ext2fs_get_mem(strlen(parent_name)+strlen(gp.name)+2, 119 &ret); 120 else 121 retval = ext2fs_get_mem(strlen(parent_name)+5, &ret); 122 if (retval) 123 goto cleanup; 124 125 ret[0] = 0; 126 if (parent_name[1]) 127 strcat(ret, parent_name); 128 strcat(ret, "/"); 129 if (gp.name) 130 strcat(ret, gp.name); 131 else 132 strcat(ret, "???"); 133 *name = ret; 134 ext2fs_free_mem(&parent_name); 135 retval = 0; 136 137 cleanup: 138 if (gp.name) 139 ext2fs_free_mem(&gp.name); 140 return retval; 141 } 142 143 errcode_t ext2fs_get_pathname(ext2_filsys fs, ext2_ino_t dir, ext2_ino_t ino, 144 char **name) 145 { 146 char *buf; 147 errcode_t retval; 148 149 EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS); 150 151 retval = ext2fs_get_mem(fs->blocksize, &buf); 152 if (retval) 153 return retval; 154 if (dir == ino) 155 ino = 0; 156 retval = ext2fs_get_pathname_int(fs, dir, ino, 32, buf, name); 157 ext2fs_free_mem(&buf); 158 return retval; 159 160 } 161
