libbb/recursive_action.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * Utility routines.
   4  *
   5  * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.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)
  57                 status = stat(fileName, &statbuf);
  58         else
  59                 status = lstat(fileName, &statbuf);
  60
  61         if (status < 0) {
  62 #ifdef DEBUG_RECURS_ACTION
  63                 bb_error_msg("status=%d followLinks=%d TRUE=%d",
  64                                 status, followLinks, TRUE);
  65 #endif
  66                 bb_perror_msg("%s", fileName);
  67                 return FALSE;
  68         }
  69
  70         if (! followLinks && (S_ISLNK(statbuf.st_mode))) {
  71                 if (fileAction == NULL)
  72                         return TRUE;
  73                 else
  74                         return fileAction(fileName, &statbuf, userData);
  75         }
  76
  77         if (! recurse) {
  78                 if (S_ISDIR(statbuf.st_mode)) {
  79                         if (dirAction != NULL)
  80                                 return (dirAction(fileName, &statbuf, userData));
  81                         else
  82                                 return TRUE;
  83                 }
  84         }
  85
  86         if (S_ISDIR(statbuf.st_mode)) {
  87                 DIR *dir;
  88
  89                 if (dirAction != NULL && ! depthFirst) {
  90                         status = dirAction(fileName, &statbuf, userData);
  91                         if (! status) {
  92                                 bb_perror_msg("%s", fileName);
  93                                 return FALSE;
  94                         } else if (status == SKIP)
  95                                 return TRUE;
  96                 }
  97                 dir = opendir(fileName);
  98                 if (!dir) {
  99                         bb_perror_msg("%s", fileName);
 100                         return FALSE;
 101                 }
 102                 status = TRUE;
 103                 while ((next = readdir(dir)) != NULL) {
 104                         char *nextFile;
 105
 106                         nextFile = concat_subpath_file(fileName, next->d_name);
 107                         if(nextFile == NULL)
 108                                 continue;
 109                         if (! recursive_action(nextFile, TRUE, followLinks, depthFirst,
 110                                                 fileAction, dirAction, userData)) {
 111                                 status = FALSE;
 112                         }
 113                         free(nextFile);
 114                 }
 115                 closedir(dir);
 116                 if (dirAction != NULL && depthFirst) {
 117                         if (! dirAction(fileName, &statbuf, userData)) {
 118                                 bb_perror_msg("%s", fileName);
 119                                 return FALSE;
 120                         }
 121                 }
 122                 if (! status)
 123                         return FALSE;
 124         } else {
 125                 if (fileAction == NULL)
 126                         return TRUE;
 127                 else
 128                         return fileAction(fileName, &statbuf, userData);
 129         }
 130         return TRUE;
 131 }
 132
 133
 134 /* END CODE */
 135 /*
 136 Local Variables:
 137 c-file-style: "linux"
 138 c-basic-offset: 4
 139 tab-width: 4
 140 End:
 141 */