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