| /* vi: set sw=4 ts=4: */ |
| /* |
| * Utility routines. |
| * |
| * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org> |
| * |
| * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. |
| */ |
| |
| #include "libbb.h" |
| |
| #undef DEBUG_RECURS_ACTION |
| |
| /* |
| * Walk down all the directories under the specified |
| * location, and do something (something specified |
| * by the fileAction and dirAction function pointers). |
| * |
| * Unfortunately, while nftw(3) could replace this and reduce |
| * code size a bit, nftw() wasn't supported before GNU libc 2.1, |
| * and so isn't sufficiently portable to take over since glibc2.1 |
| * is so stinking huge. |
| */ |
| |
| static int true_action(const char *fileName, struct stat *statbuf, void* userData, int depth) |
| { |
| return TRUE; |
| } |
| |
| /* fileAction return value of 0 on any file in directory will make |
| * recursive_action() return 0, but it doesn't stop directory traversal |
| * (fileAction/dirAction will be called on each file). |
| * |
| * if !depthFirst, dirAction return value of 0 (FALSE) or 2 (SKIP) |
| * prevents recursion into that directory, instead |
| * recursive_action() returns 0 (if FALSE) or 1 (if SKIP). |
| * |
| * followLinks=0/1 differs mainly in handling of links to dirs. |
| * 0: lstat(statbuf). Calls fileAction on link name even if points to dir. |
| * 1: stat(statbuf). Calls dirAction and optionally recurse on link to dir. |
| */ |
| |
| int recursive_action(const char *fileName, |
| int recurse, int followLinks, int depthFirst, |
| int (*fileAction)(const char *fileName, struct stat *statbuf, void* userData, int depth), |
| int (*dirAction)(const char *fileName, struct stat *statbuf, void* userData, int depth), |
| void* userData, |
| int depth) |
| { |
| struct stat statbuf; |
| int status; |
| DIR *dir; |
| struct dirent *next; |
| |
| if (!fileAction) fileAction = true_action; |
| if (!dirAction) dirAction = true_action; |
| |
| status = (followLinks ? stat : lstat)(fileName, &statbuf); |
| |
| if (status < 0) { |
| #ifdef DEBUG_RECURS_ACTION |
| bb_error_msg("status=%d followLinks=%d TRUE=%d", |
| status, followLinks, TRUE); |
| #endif |
| bb_perror_msg("%s", fileName); |
| return FALSE; |
| } |
| |
| /* If S_ISLNK(m), then we know that !S_ISDIR(m). |
| * Then we can skip checking first part: if it is true, then |
| * (!dir) is also true! */ |
| if ( /* (!followLinks && S_ISLNK(statbuf.st_mode)) || */ |
| !S_ISDIR(statbuf.st_mode) |
| ) { |
| return fileAction(fileName, &statbuf, userData, depth); |
| } |
| |
| /* It's a directory (or a link to one, and followLinks is set) */ |
| |
| if (!recurse) { |
| return dirAction(fileName, &statbuf, userData, depth); |
| } |
| |
| if (!depthFirst) { |
| status = dirAction(fileName, &statbuf, userData, depth); |
| if (!status) { |
| bb_perror_msg("%s", fileName); |
| return FALSE; |
| } |
| if (status == SKIP) |
| return TRUE; |
| } |
| |
| dir = opendir(fileName); |
| if (!dir) { |
| /* findutils-4.1.20 reports this */ |
| /* (i.e. it doesn't silently return with exit code 1) */ |
| /* To trigger: "find -exec rm -rf {} \;" */ |
| bb_perror_msg("%s", fileName); |
| return FALSE; |
| } |
| status = TRUE; |
| while ((next = readdir(dir)) != NULL) { |
| char *nextFile; |
| |
| nextFile = concat_subpath_file(fileName, next->d_name); |
| if (nextFile == NULL) |
| continue; |
| if (!recursive_action(nextFile, TRUE, followLinks, depthFirst, |
| fileAction, dirAction, userData, depth+1)) { |
| status = FALSE; |
| } |
| free(nextFile); |
| } |
| closedir(dir); |
| if (depthFirst) { |
| if (!dirAction(fileName, &statbuf, userData, depth)) { |
| bb_perror_msg("%s", fileName); |
| return FALSE; |
| } |
| } |
| |
| if (!status) |
| return FALSE; |
| return TRUE; |
| } |