libbb/recursive_action.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * Utility routines.
   4  *
   5  * Copyright (C) 1999,2000,2001 by Erik Andersen <andersee@debian.org>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  15  * General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  20  */
  21
  22 #include <stdio.h>
  23 #include <string.h>
  24 #include <dirent.h>
  25 #include <sys/stat.h>
  26 #include <stdlib.h>     /* free() */
  27 #include "libbb.h"
  28
  29 #undef DEBUG_RECURS_ACTION
  30
  31
  32 /*
  33  * Walk down all the directories under the specified
  34  * location, and do something (something specified
  35  * by the fileAction and dirAction function pointers).
  36  *
  37  * Unfortunately, while nftw(3) could replace this and reduce
  38  * code size a bit, nftw() wasn't supported before GNU libc 2.1,
  39  * and so isn't sufficiently portable to take over since glibc2.1
  40  * is so stinking huge.
  41  */
  42 int recursive_action(const char *fileName,
  43                                         int recurse, int followLinks, int depthFirst,
  44                                         int (*fileAction) (const char *fileName,
  45                                                                            struct stat * statbuf,
  46                                                                            void* userData),
  47                                         int (*dirAction) (const char *fileName,
  48                                                                           struct stat * statbuf,
  49                                                                           void* userData),
  50                                         void* userData)
  51 {
  52         int status;
  53         struct stat statbuf;
  54         struct dirent *next;
  55
  56         if (followLinks == TRUE)
  57                 status = stat(fileName, &statbuf);
  58         else
  59                 status = lstat(fileName, &statbuf);
  60
  61         if (status < 0) {
  62 #ifdef DEBUG_RECURS_ACTION
  63                 fprintf(stderr,
  64                                 "status=%d followLinks=%d TRUE=%d\n",
  65                                 status, followLinks, TRUE);
  66 #endif
  67                 perror_msg("%s", fileName);
  68                 return FALSE;
  69         }
  70
  71         if ((followLinks == FALSE) && (S_ISLNK(statbuf.st_mode))) {
  72                 if (fileAction == NULL)
  73                         return TRUE;
  74                 else
  75                         return fileAction(fileName, &statbuf, userData);
  76         }
  77
  78         if (recurse == FALSE) {
  79                 if (S_ISDIR(statbuf.st_mode)) {
  80                         if (dirAction != NULL)
  81                                 return (dirAction(fileName, &statbuf, userData));
  82                         else
  83                                 return TRUE;
  84                 }
  85         }
  86
  87         if (S_ISDIR(statbuf.st_mode)) {
  88                 DIR *dir;
  89
  90                 if (dirAction != NULL && depthFirst == FALSE) {
  91                         status = dirAction(fileName, &statbuf, userData);
  92                         if (status == FALSE) {
  93                                 perror_msg("%s", fileName);
  94                                 return FALSE;
  95                         } else if (status == SKIP)
  96                                 return TRUE;
  97                 }
  98                 dir = opendir(fileName);
  99                 if (!dir) {
 100                         perror_msg("%s", fileName);
 101                         return FALSE;
 102                 }
 103                 status = TRUE;
 104                 while ((next = readdir(dir)) != NULL) {
 105                         char *nextFile;
 106
 107                         if ((strcmp(next->d_name, "..") == 0)
 108                                         || (strcmp(next->d_name, ".") == 0)) {
 109                                 continue;
 110                         }
 111                         nextFile = concat_path_file(fileName, next->d_name);
 112                         if (recursive_action(nextFile, TRUE, followLinks, depthFirst,
 113                                                 fileAction, dirAction, userData) == FALSE) {
 114                                 status = FALSE;
 115                         }
 116                         free(nextFile);
 117                 }
 118                 closedir(dir);
 119                 if (dirAction != NULL && depthFirst == TRUE) {
 120                         if (dirAction(fileName, &statbuf, userData) == FALSE) {
 121                                 perror_msg("%s", fileName);
 122                                 return FALSE;
 123                         }
 124                 }
 125                 if (status == FALSE)
 126                         return FALSE;
 127         } else {
 128                 if (fileAction == NULL)
 129                         return TRUE;
 130                 else
 131                         return fileAction(fileName, &statbuf, userData);
 132         }
 133         return TRUE;
 134 }
 135
 136
 137 /* END CODE */
 138 /*
 139 Local Variables:
 140 c-file-style: "linux"
 141 c-basic-offset: 4
 142 tab-width: 4
 143 End:
 144 */