w32/compat/dirent.c

   1 /* Directory entry code for Window platforms.
   2 Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
   3 2006, 2007, 2008, 2009 Free Software Foundation, Inc.
   4 This file is part of GNU Make.
   5
   6 GNU Make is free software; you can redistribute it and/or modify it under the
   7 terms of the GNU General Public License as published by the Free Software
   8 Foundation; either version 3 of the License, or (at your option) any later
   9 version.
  10
  11 GNU Make is distributed in the hope that it will be useful, but WITHOUT ANY
  12 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
  13 A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
  14
  15 You should have received a copy of the GNU General Public License along with
  16 this program.  If not, see <http://www.gnu.org/licenses/>.  */
  17
  18
  19 #include <sys/types.h>
  20 #include <sys/stat.h>
  21 #include <errno.h>
  22 #include <string.h>
  23 #include <stdlib.h>
  24 #include "dirent.h"
  25
  26
  27 DIR*
  28 opendir(const char* pDirName)
  29 {
  30         struct stat sb;
  31         DIR*    pDir;
  32         char*   pEndDirName;
  33         int     nBufferLen;
  34
  35         /* sanity checks */
  36         if (!pDirName) {
  37                 errno = EINVAL;
  38                 return NULL;
  39         }
  40         if (stat(pDirName, &sb) != 0) {
  41                 errno = ENOENT;
  42                 return NULL;
  43         }
  44         if ((sb.st_mode & S_IFMT) != S_IFDIR) {
  45                 errno = ENOTDIR;
  46                 return NULL;
  47         }
  48
  49         /* allocate a DIR structure to return */
  50         pDir = (DIR *) malloc(sizeof (DIR));
  51
  52         if (!pDir)
  53                 return NULL;
  54
  55         /* input directory name length */
  56         nBufferLen = strlen(pDirName);
  57
  58         /* copy input directory name to DIR buffer */
  59         strcpy(pDir->dir_pDirectoryName, pDirName);
  60
  61         /* point to end of the copied directory name */
  62         pEndDirName = &pDir->dir_pDirectoryName[nBufferLen - 1];
  63
  64         /* if directory name did not end in '/' or '\', add '/' */
  65         if ((*pEndDirName != '/') && (*pEndDirName != '\\')) {
  66                 pEndDirName++;
  67                 *pEndDirName = '/';
  68         }
  69
  70         /* now append the wildcard character to the buffer */
  71         pEndDirName++;
  72         *pEndDirName = '*';
  73         pEndDirName++;
  74         *pEndDirName = '\0';
  75
  76         /* other values defaulted */
  77         pDir->dir_nNumFiles = 0;
  78         pDir->dir_hDirHandle = INVALID_HANDLE_VALUE;
  79         pDir->dir_ulCookie = __DIRENT_COOKIE;
  80
  81         return pDir;
  82 }
  83
  84 void
  85 closedir(DIR *pDir)
  86 {
  87         /* got a valid pointer? */
  88         if (!pDir) {
  89                 errno = EINVAL;
  90                 return;
  91         }
  92
  93         /* sanity check that this is a DIR pointer */
  94         if (pDir->dir_ulCookie != __DIRENT_COOKIE) {
  95                 errno = EINVAL;
  96                 return;
  97         }
  98
  99         /* close the WINDOWS32 directory handle */
 100         if (pDir->dir_hDirHandle != INVALID_HANDLE_VALUE)
 101                 FindClose(pDir->dir_hDirHandle);
 102
 103         free(pDir);
 104
 105         return;
 106 }
 107
 108 struct dirent *
 109 readdir(DIR* pDir)
 110 {
 111         WIN32_FIND_DATA wfdFindData;
 112
 113         if (!pDir) {
 114                 errno = EINVAL;
 115                 return NULL;
 116         }
 117
 118         /* sanity check that this is a DIR pointer */
 119         if (pDir->dir_ulCookie != __DIRENT_COOKIE) {
 120                 errno = EINVAL;
 121                 return NULL;
 122         }
 123
 124         if (pDir->dir_nNumFiles == 0) {
 125                 pDir->dir_hDirHandle = FindFirstFile(pDir->dir_pDirectoryName, &wfdFindData);
 126                 if (pDir->dir_hDirHandle == INVALID_HANDLE_VALUE)
 127                         return NULL;
 128         } else if (!FindNextFile(pDir->dir_hDirHandle, &wfdFindData))
 129                         return NULL;
 130
 131         /* bump count for next call to readdir() or telldir() */
 132         pDir->dir_nNumFiles++;
 133
 134         /* fill in struct dirent values */
 135         pDir->dir_sdReturn.d_ino = -1;
 136         strcpy(pDir->dir_sdReturn.d_name, wfdFindData.cFileName);
 137
 138         return &pDir->dir_sdReturn;
 139 }
 140
 141 void
 142 rewinddir(DIR* pDir)
 143 {
 144         if (!pDir) {
 145                 errno = EINVAL;
 146                 return;
 147         }
 148
 149         /* sanity check that this is a DIR pointer */
 150         if (pDir->dir_ulCookie != __DIRENT_COOKIE) {
 151                 errno = EINVAL;
 152                 return;
 153         }
 154
 155         /* close the WINDOWS32 directory handle */
 156         if (pDir->dir_hDirHandle != INVALID_HANDLE_VALUE)
 157                 if (!FindClose(pDir->dir_hDirHandle))
 158                         errno = EBADF;
 159
 160         /* reset members which control readdir() */
 161         pDir->dir_hDirHandle = INVALID_HANDLE_VALUE;
 162         pDir->dir_nNumFiles = 0;
 163
 164         return;
 165 }
 166
 167 int
 168 telldir(DIR* pDir)
 169 {
 170         if (!pDir) {
 171                 errno = EINVAL;
 172                 return -1;
 173         }
 174
 175         /* sanity check that this is a DIR pointer */
 176         if (pDir->dir_ulCookie != __DIRENT_COOKIE) {
 177                 errno = EINVAL;
 178                 return -1;
 179         }
 180
 181         /* return number of times readdir() called */
 182         return pDir->dir_nNumFiles;
 183 }
 184
 185 void
 186 seekdir(DIR* pDir, long nPosition)
 187 {
 188         if (!pDir)
 189                 return;
 190
 191         /* sanity check that this is a DIR pointer */
 192         if (pDir->dir_ulCookie != __DIRENT_COOKIE)
 193                 return;
 194
 195         /* go back to beginning of directory */
 196         rewinddir(pDir);
 197
 198         /* loop until we have found position we care about */
 199         for (--nPosition; nPosition && readdir(pDir); nPosition--);
 200
 201         /* flag invalid nPosition value */
 202         if (nPosition)
 203                 errno = EINVAL;
 204
 205         return;
 206 }