libbb/recursive_action.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * Utility routines.
   4  *
   5  * Copyright (C) tons of folks.  Tracking down who wrote what
   6  * isn't something I'm going to worry about...  If you wrote something
   7  * here, please feel free to acknowledge your work.
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  17  * General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  22  *
  23  * Based in part on code from sash, Copyright (c) 1999 by David I. Bell
  24  * Permission has been granted to redistribute this code under the GPL.
  25  *
  26  */
  27
  28 #include <stdio.h>
  29 #include <string.h>
  30 #include <dirent.h>
  31 #include <sys/stat.h>
  32 #include <stdlib.h>     /* free() */
  33 #include "libbb.h"
  34
  35
  36 /* same conditions as recursive_action */
  37 #define bb_need_name_too_long
  38 #define BB_DECLARE_EXTERN
  39 #include "../messages.c"
  40
  41 #undef DEBUG_RECURS_ACTION
  42
  43
  44 /*
  45  * Walk down all the directories under the specified
  46  * location, and do something (something specified
  47  * by the fileAction and dirAction function pointers).
  48  *
  49  * Unfortunately, while nftw(3) could replace this and reduce
  50  * code size a bit, nftw() wasn't supported before GNU libc 2.1,
  51  * and so isn't sufficiently portable to take over since glibc2.1
  52  * is so stinking huge.
  53  */
  54 int recursive_action(const char *fileName,
  55                                         int recurse, int followLinks, int depthFirst,
  56                                         int (*fileAction) (const char *fileName,
  57                                                                            struct stat * statbuf,
  58                                                                            void* userData),
  59                                         int (*dirAction) (const char *fileName,
  60                                                                           struct stat * statbuf,
  61                                                                           void* userData),
  62                                         void* userData)
  63 {
  64         int status;
  65         struct stat statbuf;
  66         struct dirent *next;
  67
  68         if (followLinks == TRUE)
  69                 status = stat(fileName, &statbuf);
  70         else
  71                 status = lstat(fileName, &statbuf);
  72
  73         if (status < 0) {
  74 #ifdef DEBUG_RECURS_ACTION
  75                 fprintf(stderr,
  76                                 "status=%d followLinks=%d TRUE=%d\n",
  77                                 status, followLinks, TRUE);
  78 #endif
  79                 perror_msg("%s", fileName);
  80                 return FALSE;
  81         }
  82
  83         if ((followLinks == FALSE) && (S_ISLNK(statbuf.st_mode))) {
  84                 if (fileAction == NULL)
  85                         return TRUE;
  86                 else
  87                         return fileAction(fileName, &statbuf, userData);
  88         }
  89
  90         if (recurse == FALSE) {
  91                 if (S_ISDIR(statbuf.st_mode)) {
  92                         if (dirAction != NULL)
  93                                 return (dirAction(fileName, &statbuf, userData));
  94                         else
  95                                 return TRUE;
  96                 }
  97         }
  98
  99         if (S_ISDIR(statbuf.st_mode)) {
 100                 DIR *dir;
 101
 102                 if (dirAction != NULL && depthFirst == FALSE) {
 103                         status = dirAction(fileName, &statbuf, userData);
 104                         if (status == FALSE) {
 105                                 perror_msg("%s", fileName);
 106                                 return FALSE;
 107                         } else if (status == SKIP)
 108                                 return TRUE;
 109                 }
 110                 dir = opendir(fileName);
 111                 if (!dir) {
 112                         perror_msg("%s", fileName);
 113                         return FALSE;
 114                 }
 115                 status = TRUE;
 116                 while ((next = readdir(dir)) != NULL) {
 117                         char *nextFile;
 118
 119                         if ((strcmp(next->d_name, "..") == 0)
 120                                         || (strcmp(next->d_name, ".") == 0)) {
 121                                 continue;
 122                         }
 123                         nextFile = concat_path_file(fileName, next->d_name);
 124                         if (recursive_action(nextFile, TRUE, followLinks, depthFirst,
 125                                                 fileAction, dirAction, userData) == FALSE) {
 126                                 status = FALSE;
 127                         }
 128                         free(nextFile);
 129                 }
 130                 closedir(dir);
 131                 if (dirAction != NULL && depthFirst == TRUE) {
 132                         if (dirAction(fileName, &statbuf, userData) == FALSE) {
 133                                 perror_msg("%s", fileName);
 134                                 return FALSE;
 135                         }
 136                 }
 137                 if (status == FALSE)
 138                         return FALSE;
 139         } else {
 140                 if (fileAction == NULL)
 141                         return TRUE;
 142                 else
 143                         return fileAction(fileName, &statbuf, userData);
 144         }
 145         return TRUE;
 146 }
 147
 148
 149 /* END CODE */
 150 /*
 151 Local Variables:
 152 c-file-style: "linux"
 153 c-basic-offset: 4
 154 tab-width: 4
 155 End:
 156 */