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 "libbb.h"
  33
  34 /* same conditions as recursive_action */
  35 #define bb_need_name_too_long
  36 #define BB_DECLARE_EXTERN
  37 #include "../messages.c"
  38
  39 #undef DEBUG_RECURS_ACTION
  40
  41
  42 /*
  43  * Walk down all the directories under the specified
  44  * location, and do something (something specified
  45  * by the fileAction and dirAction function pointers).
  46  *
  47  * Unfortunately, while nftw(3) could replace this and reduce
  48  * code size a bit, nftw() wasn't supported before GNU libc 2.1,
  49  * and so isn't sufficiently portable to take over since glibc2.1
  50  * is so stinking huge.
  51  */
  52 int recursive_action(const char *fileName,
  53                                         int recurse, int followLinks, int depthFirst,
  54                                         int (*fileAction) (const char *fileName,
  55                                                                            struct stat * statbuf,
  56                                                                            void* userData),
  57                                         int (*dirAction) (const char *fileName,
  58                                                                           struct stat * statbuf,
  59                                                                           void* userData),
  60                                         void* userData)
  61 {
  62         int status;
  63         struct stat statbuf;
  64         struct dirent *next;
  65
  66         if (followLinks == TRUE)
  67                 status = stat(fileName, &statbuf);
  68         else
  69                 status = lstat(fileName, &statbuf);
  70
  71         if (status < 0) {
  72 #ifdef DEBUG_RECURS_ACTION
  73                 fprintf(stderr,
  74                                 "status=%d followLinks=%d TRUE=%d\n",
  75                                 status, followLinks, TRUE);
  76 #endif
  77                 perror_msg("%s", fileName);
  78                 return FALSE;
  79         }
  80
  81         if ((followLinks == FALSE) && (S_ISLNK(statbuf.st_mode))) {
  82                 if (fileAction == NULL)
  83                         return TRUE;
  84                 else
  85                         return fileAction(fileName, &statbuf, userData);
  86         }
  87
  88         if (recurse == FALSE) {
  89                 if (S_ISDIR(statbuf.st_mode)) {
  90                         if (dirAction != NULL)
  91                                 return (dirAction(fileName, &statbuf, userData));
  92                         else
  93                                 return TRUE;
  94                 }
  95         }
  96
  97         if (S_ISDIR(statbuf.st_mode)) {
  98                 DIR *dir;
  99
 100                 if (dirAction != NULL && depthFirst == FALSE) {
 101                         status = dirAction(fileName, &statbuf, userData);
 102                         if (status == FALSE) {
 103                                 perror_msg("%s", fileName);
 104                                 return FALSE;
 105                         } else if (status == SKIP)
 106                                 return TRUE;
 107                 }
 108                 dir = opendir(fileName);
 109                 if (!dir) {
 110                         perror_msg("%s", fileName);
 111                         return FALSE;
 112                 }
 113                 status = TRUE;
 114                 while ((next = readdir(dir)) != NULL) {
 115                         char nextFile[PATH_MAX];
 116
 117                         if ((strcmp(next->d_name, "..") == 0)
 118                                         || (strcmp(next->d_name, ".") == 0)) {
 119                                 continue;
 120                         }
 121                         if (strlen(fileName) + strlen(next->d_name) + 1 > PATH_MAX) {
 122                                 error_msg(name_too_long);
 123                                 return FALSE;
 124                         }
 125                         memset(nextFile, 0, sizeof(nextFile));
 126                         if (fileName[strlen(fileName)-1] == '/')
 127                                 sprintf(nextFile, "%s%s", fileName, next->d_name);
 128                         else
 129                                 sprintf(nextFile, "%s/%s", fileName, next->d_name);
 130                         if (recursive_action(nextFile, TRUE, followLinks, depthFirst,
 131                                                 fileAction, dirAction, userData) == FALSE) {
 132                                 status = FALSE;
 133                         }
 134                 }
 135                 closedir(dir);
 136                 if (dirAction != NULL && depthFirst == TRUE) {
 137                         if (dirAction(fileName, &statbuf, userData) == FALSE) {
 138                                 perror_msg("%s", fileName);
 139                                 return FALSE;
 140                         }
 141                 }
 142                 if (status == FALSE)
 143                         return FALSE;
 144         } else {
 145                 if (fileAction == NULL)
 146                         return TRUE;
 147                 else
 148                         return fileAction(fileName, &statbuf, userData);
 149         }
 150         return TRUE;
 151 }
 152
 153
 154 /* END CODE */
 155 /*
 156 Local Variables:
 157 c-file-style: "linux"
 158 c-basic-offset: 4
 159 tab-width: 4
 160 End:
 161 */