X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=libbb%2Frecursive_action.c;h=05ff5d84fd2201b6d9ad621efcce20fb4007a95c;hb=067e3f031a2107c69d287d89b9543fbfe5c0a571;hp=510080b8360d2350c014565c6d010716b6f2a0db;hpb=fd402941a7612b5254a65edfedc074d66da3883a;p=oweals%2Fbusybox.git diff --git a/libbb/recursive_action.c b/libbb/recursive_action.c index 510080b83..05ff5d84f 100644 --- a/libbb/recursive_action.c +++ b/libbb/recursive_action.c @@ -2,155 +2,121 @@ /* * Utility routines. * - * Copyright (C) tons of folks. Tracking down who wrote what - * isn't something I'm going to worry about... If you wrote something - * here, please feel free to acknowledge your work. - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA - * - * Based in part on code from sash, Copyright (c) 1999 by David I. Bell - * Permission has been granted to redistribute this code under the GPL. + * Copyright (C) 1999-2004 by Erik Andersen * + * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. */ -#include -#include -#include -#include -#include /* free() */ #include "libbb.h" - -/* same conditions as recursive_action */ -#define bb_need_name_too_long -#define BB_DECLARE_EXTERN -#include "../messages.c" - #undef DEBUG_RECURS_ACTION - /* - * Walk down all the directories under the specified + * 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, + * 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 (*dirAction) (const char *fileName, - struct stat * statbuf, - void* userData), - void* userData) + 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) { - int status; struct stat statbuf; + int status; + DIR *dir; struct dirent *next; - if (followLinks == TRUE) - status = stat(fileName, &statbuf); - else - status = lstat(fileName, &statbuf); + if (!fileAction) fileAction = true_action; + if (!dirAction) dirAction = true_action; + + status = (followLinks ? stat : lstat)(fileName, &statbuf); if (status < 0) { #ifdef DEBUG_RECURS_ACTION - fprintf(stderr, - "status=%d followLinks=%d TRUE=%d\n", + bb_error_msg("status=%d followLinks=%d TRUE=%d", status, followLinks, TRUE); #endif - perror_msg("%s", fileName); + bb_perror_msg("%s", fileName); return FALSE; } - if ((followLinks == FALSE) && (S_ISLNK(statbuf.st_mode))) { - if (fileAction == NULL) - return TRUE; - else - return fileAction(fileName, &statbuf, userData); + /* 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); } - if (recurse == FALSE) { - if (S_ISDIR(statbuf.st_mode)) { - if (dirAction != NULL) - return (dirAction(fileName, &statbuf, userData)); - else - return TRUE; + /* 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; } - if (S_ISDIR(statbuf.st_mode)) { - DIR *dir; + dir = opendir(fileName); + if (!dir) { + return FALSE; + } + status = TRUE; + while ((next = readdir(dir)) != NULL) { + char *nextFile; - if (dirAction != NULL && depthFirst == FALSE) { - status = dirAction(fileName, &statbuf, userData); - if (status == FALSE) { - perror_msg("%s", fileName); - return FALSE; - } else if (status == SKIP) - return TRUE; + 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; } - dir = opendir(fileName); - if (!dir) { - perror_msg("%s", fileName); + free(nextFile); + } + closedir(dir); + if (depthFirst) { + if (!dirAction(fileName, &statbuf, userData, depth)) { + bb_perror_msg("%s", fileName); return FALSE; } - status = TRUE; - while ((next = readdir(dir)) != NULL) { - char *nextFile; - - if ((strcmp(next->d_name, "..") == 0) - || (strcmp(next->d_name, ".") == 0)) { - continue; - } - nextFile = concat_path_file(fileName, next->d_name); - if (recursive_action(nextFile, TRUE, followLinks, depthFirst, - fileAction, dirAction, userData) == FALSE) { - status = FALSE; - } - free(nextFile); - } - closedir(dir); - if (dirAction != NULL && depthFirst == TRUE) { - if (dirAction(fileName, &statbuf, userData) == FALSE) { - perror_msg("%s", fileName); - return FALSE; - } - } - if (status == FALSE) - return FALSE; - } else { - if (fileAction == NULL) - return TRUE; - else - return fileAction(fileName, &statbuf, userData); } + + if (!status) + return FALSE; return TRUE; } - - -/* END CODE */ -/* -Local Variables: -c-file-style: "linux" -c-basic-offset: 4 -tab-width: 4 -End: -*/