1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * Utility routines.
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4 | *
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5 | * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
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6 | *
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7 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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8 | */
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9 |
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10 | #include "libbb.h"
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11 |
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12 | #undef DEBUG_RECURS_ACTION
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13 |
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14 | /*
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15 | * Walk down all the directories under the specified
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16 | * location, and do something (something specified
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17 | * by the fileAction and dirAction function pointers).
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18 | *
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19 | * Unfortunately, while nftw(3) could replace this and reduce
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20 | * code size a bit, nftw() wasn't supported before GNU libc 2.1,
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21 | * and so isn't sufficiently portable to take over since glibc2.1
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22 | * is so stinking huge.
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23 | */
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24 |
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25 | static int true_action(const char *fileName, struct stat *statbuf,
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26 | void* userData, int depth)
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27 | {
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28 | return TRUE;
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29 | }
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30 |
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31 | /* fileAction return value of 0 on any file in directory will make
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32 | * recursive_action() return 0, but it doesn't stop directory traversal
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33 | * (fileAction/dirAction will be called on each file).
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34 | *
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35 | * if !depthFirst, dirAction return value of 0 (FALSE) or 2 (SKIP)
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36 | * prevents recursion into that directory, instead
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37 | * recursive_action() returns 0 (if FALSE) or 1 (if SKIP).
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38 | *
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39 | * followLinks=0/1 differs mainly in handling of links to dirs.
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40 | * 0: lstat(statbuf). Calls fileAction on link name even if points to dir.
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41 | * 1: stat(statbuf). Calls dirAction and optionally recurse on link to dir.
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42 | */
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43 |
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44 | int recursive_action(const char *fileName,
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45 | unsigned flags,
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46 | int (*fileAction)(const char *fileName, struct stat *statbuf, void* userData, int depth),
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47 | int (*dirAction)(const char *fileName, struct stat *statbuf, void* userData, int depth),
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48 | void* userData,
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49 | unsigned depth)
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50 | {
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51 | struct stat statbuf;
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52 | int status;
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53 | DIR *dir;
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54 | struct dirent *next;
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55 |
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56 | if (!fileAction) fileAction = true_action;
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57 | if (!dirAction) dirAction = true_action;
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58 |
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59 | status = ACTION_FOLLOWLINKS; /* hijack a variable for bitmask... */
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60 | if (!depth) status = ACTION_FOLLOWLINKS | ACTION_FOLLOWLINKS_L0;
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61 | status = ((flags & status) ? stat : lstat)(fileName, &statbuf);
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62 | if (status < 0) {
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63 | #ifdef DEBUG_RECURS_ACTION
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64 | bb_error_msg("status=%d flags=%x", status, flags);
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65 | #endif
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66 | goto done_nak_warn;
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67 | }
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68 |
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69 | /* If S_ISLNK(m), then we know that !S_ISDIR(m).
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70 | * Then we can skip checking first part: if it is true, then
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71 | * (!dir) is also true! */
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72 | if ( /* (!(flags & ACTION_FOLLOWLINKS) && S_ISLNK(statbuf.st_mode)) || */
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73 | !S_ISDIR(statbuf.st_mode)
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74 | ) {
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75 | return fileAction(fileName, &statbuf, userData, depth);
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76 | }
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77 |
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78 | /* It's a directory (or a link to one, and followLinks is set) */
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79 |
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80 | if (!(flags & ACTION_RECURSE)) {
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81 | return dirAction(fileName, &statbuf, userData, depth);
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82 | }
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83 |
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84 | if (!(flags & ACTION_DEPTHFIRST)) {
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85 | status = dirAction(fileName, &statbuf, userData, depth);
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86 | if (!status)
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87 | goto done_nak_warn;
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88 | if (status == SKIP)
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89 | return TRUE;
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90 | }
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91 |
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92 | dir = opendir(fileName);
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93 | if (!dir) {
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94 | /* findutils-4.1.20 reports this */
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95 | /* (i.e. it doesn't silently return with exit code 1) */
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96 | /* To trigger: "find -exec rm -rf {} \;" */
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97 | goto done_nak_warn;
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98 | }
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99 | status = TRUE;
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100 | while ((next = readdir(dir)) != NULL) {
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101 | char *nextFile;
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102 |
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103 | nextFile = concat_subpath_file(fileName, next->d_name);
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104 | if (nextFile == NULL)
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105 | continue;
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106 | /* now descend into it (NB: ACTION_RECURSE is set in flags) */
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107 | if (!recursive_action(nextFile, flags, fileAction, dirAction, userData, depth+1))
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108 | status = FALSE;
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109 | free(nextFile);
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110 | }
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111 | closedir(dir);
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112 |
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113 | if (flags & ACTION_DEPTHFIRST) {
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114 | if (!dirAction(fileName, &statbuf, userData, depth))
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115 | goto done_nak_warn;
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116 | }
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117 |
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118 | if (!status)
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119 | return FALSE;
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120 | return TRUE;
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121 |
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122 | done_nak_warn:
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123 | bb_perror_msg("%s", fileName);
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124 | return FALSE;
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125 | }
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