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 <dirent.h>
  30 #include <sys/stat.h>
  31 #include "libbb.h"
  32
  33 /* same conditions as recursive_action */
  34 #define bb_need_name_too_long
  35 #define BB_DECLARE_EXTERN
  36 #include "../messages.c"
  37
  38 #undef DEBUG_RECURS_ACTION
  39
  40
  41 /*
  42  * Walk down all the directories under the specified
  43  * location, and do something (something specified
  44  * by the fileAction and dirAction function pointers).
  45  *
  46  * Unfortunately, while nftw(3) could replace this and reduce
  47  * code size a bit, nftw() wasn't supported before GNU libc 2.1,
  48  * and so isn't sufficiently portable to take over since glibc2.1
  49  * is so stinking huge.
  50  */
  51 int recursive_action(const char *fileName,
  52                                         int recurse, int followLinks, int depthFirst,
  53                                         int (*fileAction) (const char *fileName,
  54                                                                            struct stat * statbuf,
  55                                                                            void* userData),
  56                                         int (*dirAction) (const char *fileName,
  57                                                                           struct stat * statbuf,
  58                                                                           void* userData),
  59                                         void* userData)
  60 {
  61         int status;
  62         struct stat statbuf;
  63         struct dirent *next;
  64
  65         if (followLinks == TRUE)
  66                 status = stat(fileName, &statbuf);
  67         else
  68                 status = lstat(fileName, &statbuf);
  69
  70         if (status < 0) {
  71 #ifdef DEBUG_RECURS_ACTION
  72                 fprintf(stderr,
  73                                 "status=%d followLinks=%d TRUE=%d\n",
  74                                 status, followLinks, TRUE);
  75 #endif
  76                 perror_msg("%s", fileName);
  77                 return FALSE;
  78         }
  79
  80         if ((followLinks == FALSE) && (S_ISLNK(statbuf.st_mode))) {
  81                 if (fileAction == NULL)
  82                         return TRUE;
  83                 else
  84                         return fileAction(fileName, &statbuf, userData);
  85         }
  86
  87         if (recurse == FALSE) {
  88                 if (S_ISDIR(statbuf.st_mode)) {
  89                         if (dirAction != NULL)
  90                                 return (dirAction(fileName, &statbuf, userData));
  91                         else
  92                                 return TRUE;
  93                 }
  94         }
  95
  96         if (S_ISDIR(statbuf.st_mode)) {
  97                 DIR *dir;
  98
  99                 if (dirAction != NULL && depthFirst == FALSE) {
 100                         status = dirAction(fileName, &statbuf, userData);
 101                         if (status == FALSE) {
 102                                 perror_msg("%s", fileName);
 103                                 return FALSE;
 104                         } else if (status == SKIP)
 105                                 return TRUE;
 106                 }
 107                 dir = opendir(fileName);
 108                 if (!dir) {
 109                         perror_msg("%s", fileName);
 110                         return FALSE;
 111                 }
 112                 status = TRUE;
 113                 while ((next = readdir(dir)) != NULL) {
 114                         char nextFile[PATH_MAX];
 115
 116                         if ((strcmp(next->d_name, "..") == 0)
 117                                         || (strcmp(next->d_name, ".") == 0)) {
 118                                 continue;
 119                         }
 120                         if (strlen(fileName) + strlen(next->d_name) + 1 > PATH_MAX) {
 121                                 error_msg(name_too_long);
 122                                 return FALSE;
 123                         }
 124                         memset(nextFile, 0, sizeof(nextFile));
 125                         if (fileName[strlen(fileName)-1] == '/')
 126                                 sprintf(nextFile, "%s%s", fileName, next->d_name);
 127                         else
 128                                 sprintf(nextFile, "%s/%s", fileName, next->d_name);
 129                         if (recursive_action(nextFile, TRUE, followLinks, depthFirst,
 130                                                 fileAction, dirAction, userData) == FALSE) {
 131                                 status = FALSE;
 132                         }
 133                 }
 134                 closedir(dir);
 135                 if (dirAction != NULL && depthFirst == TRUE) {
 136                         if (dirAction(fileName, &statbuf, userData) == FALSE) {
 137                                 perror_msg("%s", fileName);
 138                                 return FALSE;
 139                         }
 140                 }
 141                 if (status == FALSE)
 142                         return FALSE;
 143         } else {
 144                 if (fileAction == NULL)
 145                         return TRUE;
 146                 else
 147                         return fileAction(fileName, &statbuf, userData);
 148         }
 149         return TRUE;
 150 }
 151
 152
 153 /* END CODE */
 154 /*
 155 Local Variables:
 156 c-file-style: "linux"
 157 c-basic-offset: 4
 158 tab-width: 4
 159 End:
 160 */