3 * uce-dirent.h - operating system independent dirent implementation
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5 * Copyright (C) 1998-2002 Toni Ronkko
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7 * Permission is hereby granted, free of charge, to any person obtaining
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8 * a copy of this software and associated documentation files (the
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9 * ``Software''), to deal in the Software without restriction, including
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10 * without limitation the rights to use, copy, modify, merge, publish,
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11 * distribute, sublicense, and/or sell copies of the Software, and to
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12 * permit persons to whom the Software is furnished to do so, subject to
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13 * the following conditions:
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15 * The above copyright notice and this permission notice shall be included
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16 * in all copies or substantial portions of the Software.
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18 * THE SOFTWARE IS PROVIDED ``AS IS'', WITHOUT WARRANTY OF ANY KIND, EXPRESS
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19 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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20 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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21 * IN NO EVENT SHALL TONI RONKKO BE LIABLE FOR ANY CLAIM, DAMAGES OR
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22 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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23 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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24 * OTHER DEALINGS IN THE SOFTWARE.
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27 * May 28 1998, Toni Ronkko <tronkko@messi.uku.fi>
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29 * $Id: uce-dirent.h,v 1.7 2002/05/13 10:48:35 tr Exp $
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31 * $Log: uce-dirent.h,v $
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32 * Revision 1.7 2002/05/13 10:48:35 tr
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33 * embedded some source code directly to the header so that no source
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34 * modules need to be included in the MS Visual C project using the
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35 * interface, removed all the dependencies to other headers of the `uce'
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36 * library so that the header can be made public
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38 * Revision 1.6 2002/04/12 16:22:04 tr
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39 * Unified Compiling Environment (UCE) replaced `std' library
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41 * Revision 1.5 2001/07/20 16:33:40 tr
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42 * moved to `std' library and re-named defines accordingly
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44 * Revision 1.4 2001/07/10 16:47:18 tronkko
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47 * Revision 1.3 2001/01/11 13:16:43 tr
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48 * using ``uce-machine.h'' for finding out defines such as `FREEBSD'
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50 * Revision 1.2 2000/10/08 16:00:41 tr
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51 * copy of FreeBSD man page
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53 * Revision 1.1 2000/07/10 05:53:16 tr
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56 * Revision 1.2 1998/07/19 18:29:14 tr
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57 * Added error reporting capabilities and some asserts.
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59 * Revision 1.1 1998/07/04 16:27:51 tr
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63 * MSVC 1.0 scans automatic dependencies incorrectly when your project
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64 * contains this very header. The problem is that MSVC cannot handle
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65 * include directives inside #if..#endif block those are never entered.
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66 * Since this header ought to compile in many different operating systems,
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67 * there had to be several conditional blocks that are compiled only in
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68 * operating systems for what they were designed for. MSVC 1.0 cannot
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69 * handle inclusion of sys/dir.h in a part that is compiled only in Apollo
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70 * operating system. To fix the problem you need to insert DIR.H into
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71 * SYSINCL.DAT located in MSVC\BIN directory and restart visual C++.
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72 * Consult manuals for more informaton about the problem.
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74 * Since many UNIX systems have dirent.h we assume to have one also.
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75 * However, if your UNIX system does not have dirent.h you can download one
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76 * for example at: http://ftp.uni-mannheim.de/ftp/GNU/dirent/dirent.tar.gz.
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77 * You can also see if you have one of dirent.h, direct.h, dir.h, ndir.h,
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78 * sys/dir.h and sys/ndir.h somewhere. Try defining HAVE_DIRENT_H,
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79 * HAVE_DIRECT_H, HAVE_DIR_H, HAVE_NDIR_H, HAVE_SYS_DIR_H and
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80 * HAVE_SYS_NDIR_H according to the files found.
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84 #define DIRENT_H_INCLUDED
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86 /* find out platform */
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87 #if defined(MSDOS) /* MS-DOS */
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88 #elif defined(__MSDOS__) /* Turbo C/Borland */
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90 #elif defined(__DOS__) /* Watcom */
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94 #if defined(WIN32) /* MS-Windows */
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95 #elif defined(__NT__) /* Watcom */
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97 #elif defined(_WIN32) /* Microsoft */
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99 #elif defined(__WIN32__) /* Borland */
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104 * See what kind of dirent interface we have unless autoconf has already
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105 * determinated that.
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107 #if !defined(HAVE_DIRENT_H) && !defined(HAVE_DIRECT_H) && !defined(HAVE_SYS_DIR_H) && !defined(HAVE_NDIR_H) && !defined(HAVE_SYS_NDIR_H) && !defined(HAVE_DIR_H)
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108 # if defined(_MSC_VER) /* Microsoft C/C++ */
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110 # elif defined(__BORLANDC__) /* Borland C/C++ */
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111 # define HAVE_DIRENT_H
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112 # define VOID_CLOSEDIR
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113 # elif defined(__TURBOC__) /* Borland Turbo C */
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115 # elif defined(__WATCOMC__) /* Watcom C/C++ */
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116 # define HAVE_DIRECT_H
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117 # elif defined(__apollo) /* Apollo */
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118 # define HAVE_SYS_DIR_H
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119 # elif defined(__hpux) /* HP-UX */
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120 # define HAVE_DIRENT_H
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121 # elif (defined(__alpha) || defined(__alpha__)) && !defined(__linux__) /* Alpha OSF1 */
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122 # error "not implemented"
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123 # elif defined(__sgi) /* Silicon Graphics */
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124 # define HAVE_DIRENT_H
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125 # elif defined(sun) || defined(_sun) /* Sun Solaris */
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126 # define HAVE_DIRENT_H
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127 # elif defined(__FreeBSD__) /* FreeBSD */
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128 # define HAVE_DIRENT_H
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129 # elif defined(__linux__) /* Linux */
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130 # define HAVE_DIRENT_H
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131 # elif defined(__GNUC__) /* GNU C/C++ */
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132 # define HAVE_DIRENT_H
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134 # error "not implemented"
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138 /* include proper interface headers */
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139 #if defined(HAVE_DIRENT_H)
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140 # include <dirent.h>
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142 # define NAMLEN(dp) ((int)((dp)->d_namlen))
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144 # define NAMLEN(dp) ((int)(strlen((dp)->d_name)))
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147 #elif defined(HAVE_NDIR_H)
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149 # define NAMLEN(dp) ((int)((dp)->d_namlen))
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151 #elif defined(HAVE_SYS_NDIR_H)
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152 # include <sys/ndir.h>
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153 # define NAMLEN(dp) ((int)((dp)->d_namlen))
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155 #elif defined(HAVE_DIRECT_H)
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156 # include <direct.h>
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157 # define NAMLEN(dp) ((int)((dp)->d_namlen))
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159 #elif defined(HAVE_DIR_H)
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161 # define NAMLEN(dp) ((int)((dp)->d_namlen))
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163 #elif defined(HAVE_SYS_DIR_H)
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164 # include <sys/types.h>
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165 # include <sys/dir.h>
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167 # define dirent direct
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169 # define NAMLEN(dp) ((int)((dp)->d_namlen))
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171 #elif defined(MSDOS) || defined(WIN32)
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173 /* figure out type of underlaying directory interface to be used */
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174 # if defined(WIN32)
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175 # define DIRENT_WIN32_INTERFACE
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176 # elif defined(MSDOS)
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177 # define DIRENT_MSDOS_INTERFACE
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179 # error "missing native dirent interface"
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182 /*** WIN32 specifics ***/
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183 # if defined(DIRENT_WIN32_INTERFACE)
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184 # include <windows.h>
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185 # if !defined(DIRENT_MAXNAMLEN)
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186 # define DIRENT_MAXNAMLEN (MAX_PATH)
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190 /*** MS-DOS specifics ***/
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191 # elif defined(DIRENT_MSDOS_INTERFACE)
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194 /* Borland defines file length macros in dir.h */
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195 # if defined(__BORLANDC__)
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197 # if !defined(DIRENT_MAXNAMLEN)
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198 # define DIRENT_MAXNAMLEN ((MAXFILE)+(MAXEXT))
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200 # if !defined(_find_t)
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201 # define _find_t find_t
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204 /* Turbo C defines ffblk structure in dir.h */
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205 # elif defined(__TURBOC__)
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207 # if !defined(DIRENT_MAXNAMLEN)
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208 # define DIRENT_MAXNAMLEN ((MAXFILE)+(MAXEXT))
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210 # define DIRENT_USE_FFBLK
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213 # elif defined(_MSC_VER)
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214 # if !defined(DIRENT_MAXNAMLEN)
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215 # define DIRENT_MAXNAMLEN (12)
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219 # elif defined(__WATCOMC__)
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220 # if !defined(DIRENT_MAXNAMLEN)
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221 # if defined(__OS2__) || defined(__NT__)
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222 # define DIRENT_MAXNAMLEN (255)
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224 # define DIRENT_MAXNAMLEN (12)
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231 /*** generic MS-DOS and MS-Windows stuff ***/
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232 # if !defined(NAME_MAX) && defined(DIRENT_MAXNAMLEN)
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233 # define NAME_MAX DIRENT_MAXNAMLEN
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235 # if NAME_MAX < DIRENT_MAXNAMLEN
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236 # error "assertion failed: NAME_MAX >= DIRENT_MAXNAMLEN"
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241 * Substitute for real dirent structure. Note that `d_name' field is a
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242 * true character array although we have it copied in the implementation
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243 * dependent data. We could save some memory if we had declared `d_name'
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244 * as a pointer refering the name within implementation dependent data.
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245 * We have not done that since some code may rely on sizeof(d_name) to be
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246 * something other than four. Besides, directory entries are typically so
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247 * small that it takes virtually no time to copy them from place to place.
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249 typedef struct dirent {
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250 char d_name[NAME_MAX + 1];
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252 /*** Operating system specific part ***/
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253 # if defined(DIRENT_WIN32_INTERFACE) /*WIN32*/
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254 WIN32_FIND_DATA data;
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255 # elif defined(DIRENT_MSDOS_INTERFACE) /*MSDOS*/
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256 # if defined(DIRENT_USE_FFBLK)
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259 struct _find_t data;
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264 /* DIR substitute structure containing directory name. The name is
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265 * essential for the operation of ``rewinndir'' function. */
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266 typedef struct DIR {
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267 char *dirname; /* directory being scanned */
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268 dirent current; /* current entry */
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269 int dirent_filled; /* is current un-processed? */
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271 /*** Operating system specific part ***/
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272 # if defined(DIRENT_WIN32_INTERFACE)
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273 HANDLE search_handle;
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274 # elif defined(DIRENT_MSDOS_INTERFACE)
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278 # ifdef __cplusplus
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282 /* supply prototypes for dirent functions */
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283 static DIR *opendir (const char *dirname);
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284 static struct dirent *readdir (DIR *dirp);
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285 static int closedir (DIR *dirp);
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286 static void rewinddir (DIR *dirp);
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289 * Implement dirent interface as static functions so that the user does not
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290 * need to change his project in any way to use dirent function. With this
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291 * it is sufficient to include this very header from source modules using
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292 * dirent functions and the functions will be pulled in automatically.
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295 #include <stdlib.h>
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296 #include <string.h>
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297 #include <assert.h>
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300 /* use ffblk instead of _find_t if requested */
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301 #if defined(DIRENT_USE_FFBLK)
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302 # define _A_ARCH (FA_ARCH)
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303 # define _A_HIDDEN (FA_HIDDEN)
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304 # define _A_NORMAL (0)
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305 # define _A_RDONLY (FA_RDONLY)
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306 # define _A_SUBDIR (FA_DIREC)
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307 # define _A_SYSTEM (FA_SYSTEM)
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308 # define _A_VOLID (FA_LABEL)
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309 # define _dos_findnext(dest) findnext(dest)
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310 # define _dos_findfirst(name,flags,dest) findfirst(name,dest,flags)
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313 static int _initdir (DIR *p);
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314 static const char *_getdirname (const struct dirent *dp);
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315 static void _setdirname (struct DIR *dirp);
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318 * <function name="opendir">
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319 * <intro>open directory stream for reading
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320 * <syntax>DIR *opendir (const char *dirname);
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322 * <desc>Open named directory stream for read and return pointer to the
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323 * internal working area that is used for retrieving individual directory
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324 * entries. The internal working area has no fields of your interest.
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326 * <ret>Returns a pointer to the internal working area or NULL in case the
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327 * directory stream could not be opened. Global `errno' variable will set
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328 * in case of error as follows:
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331 * [EACESS |Permission denied.
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332 * [EMFILE |Too many open files used by the process.
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333 * [ENFILE |Too many open files in system.
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334 * [ENOENT |Directory does not exist.
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335 * [ENOMEM |Insufficient memory.
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336 * [ENOTDIR |dirname does not refer to directory. This value is not
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337 * reliable on MS-DOS and MS-Windows platforms. Many
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338 * implementations return ENOENT even when the name refers to a
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343 static DIR *opendir(const char *dirname)
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346 assert (dirname != NULL);
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348 dirp = (DIR*)malloc (sizeof (struct DIR));
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349 if (dirp != NULL) {
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352 /* allocate room for directory name */
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353 dirp->dirname = (char*) malloc (strlen (dirname) + 1 + strlen ("\\*.*"));
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354 if (dirp->dirname == NULL) {
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355 /* failed to duplicate directory name. errno set by malloc() */
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359 /* Copy directory name while appending directory separator and "*.*".
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360 * Directory separator is not appended if the name already ends with
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361 * drive or directory separator. Directory separator is assumed to be
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362 * '/' or '\' and drive separator is assumed to be ':'. */
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363 strcpy (dirp->dirname, dirname);
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364 p = strchr (dirp->dirname, '\0');
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365 if (dirp->dirname < p &&
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366 *(p - 1) != '\\' && *(p - 1) != '/' && *(p - 1) != ':')
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368 strcpy (p++, "\\");
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370 # ifdef DIRENT_WIN32_INTERFACE
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371 strcpy (p, "*"); /*scan files with and without extension in win32*/
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373 strcpy (p, "*.*"); /*scan files with and without extension in DOS*/
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377 if (_initdir (dirp) == 0) {
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378 /* initialization failed */
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379 free (dirp->dirname);
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389 * <function name="readdir">
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390 * <intro>read a directory entry
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391 * <syntax>struct dirent *readdir (DIR *dirp);
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393 * <desc>Read individual directory entry and return pointer to a structure
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394 * containing the name of the entry. Individual directory entries returned
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395 * include normal files, sub-directories, pseudo-directories "." and ".."
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396 * and also volume labels, hidden files and system files in MS-DOS and
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397 * MS-Windows. You might want to use stat(2) function to determinate which
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398 * one are you dealing with. Many dirent implementations already contain
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399 * equivalent information in dirent structure but you cannot depend on
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402 * The dirent structure contains several system dependent fields that
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403 * generally have no interest to you. The only interesting one is char
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404 * d_name[] that is also portable across different systems. The d_name
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405 * field contains the name of the directory entry without leading path.
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406 * While d_name is portable across different systems the actual storage
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407 * capacity of d_name varies from system to system and there is no portable
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408 * way to find out it at compile time as different systems define the
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409 * capacity of d_name with different macros and some systems do not define
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410 * capacity at all (besides actual declaration of the field). If you really
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411 * need to find out storage capacity of d_name then you might want to try
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412 * NAME_MAX macro. The NAME_MAX is defined in POSIX standard althought
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413 * there are many MS-DOS and MS-Windows implementations those do not define
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414 * it. There are also systems that declare d_name as "char d_name[1]" and
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415 * then allocate suitable amount of memory at run-time. Thanks to Alain
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416 * Decamps (Alain.Decamps@advalvas.be) for pointing it out to me.
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418 * This all leads to the fact that it is difficult to allocate space
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419 * for the directory names when the very same program is being compiled on
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420 * number of operating systems. Therefore I suggest that you always
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421 * allocate space for directory names dynamically.
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424 * Returns a pointer to a structure containing name of the directory entry
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425 * in `d_name' field or NULL if there was an error. In case of an error the
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426 * global `errno' variable will set as follows:
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429 * [EBADF |dir parameter refers to an invalid directory stream. This value
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430 * is not set reliably on all implementations.]
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434 static struct dirent *
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435 readdir (DIR *dirp)
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437 assert(dirp != NULL);
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438 if (dirp == NULL) {
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443 #if defined(DIRENT_WIN32_INTERFACE)
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444 if (dirp->search_handle == INVALID_HANDLE_VALUE) {
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445 /* directory stream was opened/rewound incorrectly or it ended normally */
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451 if (dirp->dirent_filled != 0) {
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453 * Directory entry has already been retrieved and there is no need to
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454 * retrieve a new one. Directory entry will be retrieved in advance
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455 * when the user calls readdir function for the first time. This is so
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456 * because real dirent has separate functions for opening and reading
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457 * the stream whereas Win32 and DOS dirents open the stream
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458 * automatically when we retrieve the first file. Therefore, we have to
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459 * save the first file when opening the stream and later we have to
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460 * return the saved entry when the user tries to read the first entry.
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462 dirp->dirent_filled = 0;
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464 /* fill in entry and return that */
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465 #if defined(DIRENT_WIN32_INTERFACE)
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466 if (FindNextFile (dirp->search_handle, &dirp->current.data) == FALSE) {
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467 /* Last file has been processed or an error occured */
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468 FindClose (dirp->search_handle);
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469 dirp->search_handle = INVALID_HANDLE_VALUE;
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474 # elif defined(DIRENT_MSDOS_INTERFACE)
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475 if (_dos_findnext (&dirp->current.data) != 0) {
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476 /* _dos_findnext and findnext will set errno to ENOENT when no
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477 * more entries could be retrieved. */
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482 _setdirname (dirp);
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483 assert (dirp->dirent_filled == 0);
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485 return &dirp->current;
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490 * <function name="closedir">
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491 * <intro>close directory stream.
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492 * <syntax>int closedir (DIR *dirp);
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494 * <desc>Close directory stream opened by the `opendir' function. Close of
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495 * directory stream invalidates the DIR structure as well as previously read
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498 * <ret>The function typically returns 0 on success and -1 on failure but
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499 * the function may be declared to return void on same systems. At least
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500 * Borland C/C++ and some UNIX implementations use void as a return type.
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501 * The dirent wrapper tries to define VOID_CLOSEDIR whenever closedir is
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502 * known to return nothing. The very same definition is made by the GNU
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503 * autoconf if you happen to use it.
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505 * The global `errno' variable will set to EBADF in case of error.
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509 closedir (DIR *dirp)
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513 /* make sure that dirp points to legal structure */
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514 assert (dirp != NULL);
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515 if (dirp == NULL) {
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520 /* free directory name and search handles */
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521 if (dirp->dirname != NULL) free (dirp->dirname);
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523 #if defined(DIRENT_WIN32_INTERFACE)
\r
524 if (dirp->search_handle != INVALID_HANDLE_VALUE) {
\r
525 if (FindClose (dirp->search_handle) == FALSE) {
\r
526 /* Unknown error */
\r
533 /* clear dirp structure to make sure that it cannot be used anymore*/
\r
534 memset (dirp, 0, sizeof (*dirp));
\r
535 # if defined(DIRENT_WIN32_INTERFACE)
\r
536 dirp->search_handle = INVALID_HANDLE_VALUE;
\r
545 * <function name="rewinddir">
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546 * <intro>rewind directory stream to the beginning
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547 * <syntax>void rewinddir (DIR *dirp);
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549 * <desc>Rewind directory stream to the beginning so that the next call of
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550 * readdir() returns the very first directory entry again. However, note
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551 * that next call of readdir() may not return the same directory entry as it
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552 * did in first time. The directory stream may have been affected by newly
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555 * Almost every dirent implementation ensure that rewinddir will update
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556 * the directory stream to reflect any changes made to the directory entries
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557 * since the previous ``opendir'' or ``rewinddir'' call. Keep an eye on
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558 * this if your program depends on the feature. I know at least one dirent
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559 * implementation where you are required to close and re-open the stream to
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562 * <ret>Returns nothing. If something went wrong while rewinding, you will
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563 * notice it later when you try to retrieve the first directory entry.
\r
566 rewinddir (DIR *dirp)
\r
568 /* make sure that dirp is legal */
\r
569 assert (dirp != NULL);
\r
570 if (dirp == NULL) {
\r
574 assert (dirp->dirname != NULL);
\r
576 /* close previous stream */
\r
577 #if defined(DIRENT_WIN32_INTERFACE)
\r
578 if (dirp->search_handle != INVALID_HANDLE_VALUE) {
\r
579 if (FindClose (dirp->search_handle) == FALSE) {
\r
580 /* Unknown error */
\r
586 /* re-open previous stream */
\r
587 if (_initdir (dirp) == 0) {
\r
588 /* initialization failed but we cannot deal with error. User will notice
\r
589 * error later when she tries to retrieve first directory enty. */
\r
596 * Open native directory stream object and retrieve first file.
\r
597 * Be sure to close previous stream before opening new one.
\r
600 _initdir (DIR *dirp)
\r
602 assert (dirp != NULL);
\r
603 assert (dirp->dirname != NULL);
\r
604 dirp->dirent_filled = 0;
\r
606 # if defined(DIRENT_WIN32_INTERFACE)
\r
607 /* Open stream and retrieve first file */
\r
608 dirp->search_handle = FindFirstFile (dirp->dirname, &dirp->current.data);
\r
609 if (dirp->search_handle == INVALID_HANDLE_VALUE) {
\r
610 /* something went wrong but we don't know what. GetLastError() could
\r
611 * give us more information about the error, but then we should map
\r
612 * the error code into errno. */
\r
617 # elif defined(DIRENT_MSDOS_INTERFACE)
\r
618 if (_dos_findfirst (dirp->dirname,
\r
619 _A_SUBDIR | _A_RDONLY | _A_ARCH | _A_SYSTEM | _A_HIDDEN,
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620 &dirp->current.data) != 0)
\r
622 /* _dos_findfirst and findfirst will set errno to ENOENT when no
\r
623 * more entries could be retrieved. */
\r
628 /* initialize DIR and it's first entry */
\r
629 _setdirname (dirp);
\r
630 dirp->dirent_filled = 1;
\r
636 * Return implementation dependent name of the current directory entry.
\r
638 static const char *
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639 _getdirname (const struct dirent *dp)
\r
641 #if defined(DIRENT_WIN32_INTERFACE)
\r
642 return dp->data.cFileName;
\r
644 #elif defined(DIRENT_USE_FFBLK)
\r
645 return dp->data.ff_name;
\r
648 return dp->data.name;
\r
654 * Copy name of implementation dependent directory entry to the d_name field.
\r
657 _setdirname (struct DIR *dirp) {
\r
658 /* make sure that d_name is long enough */
\r
659 assert (strlen (_getdirname (&dirp->current)) <= NAME_MAX);
\r
661 strncpy (dirp->current.d_name,
\r
662 _getdirname (&dirp->current),
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664 dirp->current.d_name[NAME_MAX] = '\0'; /*char d_name[NAME_MAX+1]*/
\r
667 # ifdef __cplusplus
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670 # define NAMLEN(dp) ((int)(strlen((dp)->d_name)))
\r
673 # error "missing dirent interface"
\r
677 #endif /*DIRENT_H*/
\r