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 #undef DEBUG_RECURS_ACTION
  36
  37
  38 /*
  39  * Walk down all the directories under the specified
  40  * location, and do something (something specified
  41  * by the fileAction and dirAction function pointers).
  42  *
  43  * Unfortunately, while nftw(3) could replace this and reduce
  44  * code size a bit, nftw() wasn't supported before GNU libc 2.1,
  45  * and so isn't sufficiently portable to take over since glibc2.1
  46  * is so stinking huge.
  47  */
  48 int recursive_action(const char *fileName,
  49                                         int recurse, int followLinks, int depthFirst,
  50                                         int (*fileAction) (const char *fileName,
  51                                                                            struct stat * statbuf,
  52                                                                            void* userData),
  53                                         int (*dirAction) (const char *fileName,
  54                                                                           struct stat * statbuf,
  55                                                                           void* userData),
  56                                         void* userData)
  57 {
  58         int status;
  59         struct stat statbuf;
  60         struct dirent *next;
  61
  62         if (followLinks == TRUE)
  63                 status = stat(fileName, &statbuf);
  64         else
  65                 status = lstat(fileName, &statbuf);
  66
  67         if (status < 0) {
  68 #ifdef DEBUG_RECURS_ACTION
  69                 fprintf(stderr,
  70                                 "status=%d followLinks=%d TRUE=%d\n",
  71                                 status, followLinks, TRUE);
  72 #endif
  73                 perror_msg("%s", fileName);
  74                 return FALSE;
  75         }
  76
  77         if ((followLinks == FALSE) && (S_ISLNK(statbuf.st_mode))) {
  78                 if (fileAction == NULL)
  79                         return TRUE;
  80                 else
  81                         return fileAction(fileName, &statbuf, userData);
  82         }
  83
  84         if (recurse == FALSE) {
  85                 if (S_ISDIR(statbuf.st_mode)) {
  86                         if (dirAction != NULL)
  87                                 return (dirAction(fileName, &statbuf, userData));
  88                         else
  89                                 return TRUE;
  90                 }
  91         }
  92
  93         if (S_ISDIR(statbuf.st_mode)) {
  94                 DIR *dir;
  95
  96                 if (dirAction != NULL && depthFirst == FALSE) {
  97                         status = dirAction(fileName, &statbuf, userData);
  98                         if (status == FALSE) {
  99                                 perror_msg("%s", fileName);
 100                                 return FALSE;
 101                         } else if (status == SKIP)
 102                                 return TRUE;
 103                 }
 104                 dir = opendir(fileName);
 105                 if (!dir) {
 106                         perror_msg("%s", fileName);
 107                         return FALSE;
 108                 }
 109                 status = TRUE;
 110                 while ((next = readdir(dir)) != NULL) {
 111                         char *nextFile;
 112
 113                         if ((strcmp(next->d_name, "..") == 0)
 114                                         || (strcmp(next->d_name, ".") == 0)) {
 115                                 continue;
 116                         }
 117                         nextFile = concat_path_file(fileName, next->d_name);
 118                         if (recursive_action(nextFile, TRUE, followLinks, depthFirst,
 119                                                 fileAction, dirAction, userData) == FALSE) {
 120                                 status = FALSE;
 121                         }
 122                         free(nextFile);
 123                 }
 124                 closedir(dir);
 125                 if (dirAction != NULL && depthFirst == TRUE) {
 126                         if (dirAction(fileName, &statbuf, userData) == FALSE) {
 127                                 perror_msg("%s", fileName);
 128                                 return FALSE;
 129                         }
 130                 }
 131                 if (status == FALSE)
 132                         return FALSE;
 133         } else {
 134                 if (fileAction == NULL)
 135                         return TRUE;
 136                 else
 137                         return fileAction(fileName, &statbuf, userData);
 138         }
 139         return TRUE;
 140 }
 141
 142
 143 /* END CODE */
 144 /*
 145 Local Variables:
 146 c-file-style: "linux"
 147 c-basic-offset: 4
 148 tab-width: 4
 149 End:
 150 */