| 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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