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<hr><h1>dirent.cpp</h1><div class="fragment"><pre>00001 <font class="comment">/*</font>
00002 <font class="comment"></font>
00003 <font class="comment"> Implementation of POSIX directory browsing functions and types for Win32.</font>
00004 <font class="comment"></font>
00005 <font class="comment"> Kevlin Henney (mailto:kevlin@acm.org), March 1997.</font>
00006 <font class="comment"></font>
00007 <font class="comment"> Copyright Kevlin Henney, 1997. All rights reserved.</font>
00008 <font class="comment"></font>
00009 <font class="comment"> Permission to use, copy, modify, and distribute this software and its</font>
00010 <font class="comment"> documentation for any purpose is hereby granted without fee, provided</font>
00011 <font class="comment"> that this copyright and permissions notice appear in all copies and</font>
00012 <font class="comment"> derivatives, and that no charge may be made for the software and its</font>
00013 <font class="comment"> documentation except to cover cost of distribution.</font>
00014 <font class="comment"> </font>
00015 <font class="comment"> This software is supplied "as is" without express or implied warranty.</font>
00016 <font class="comment"></font>
00017 <font class="comment"> But that said, if there are any problems please get in touch.</font>
00018 <font class="comment"></font>
00019 <font class="comment">*/</font>
00020
00021 <font class="preprocessor">#include <dirent.h></font>
00022 <font class="preprocessor">#include <errno.h></font>
00023 <font class="preprocessor">#include <io.h></font>
00024 <font class="preprocessor">#include <stdlib.h></font>
00025 <font class="preprocessor">#include <string.h></font>
00026
00027 <font class="keyword">struct </font>DIR
00028 {
00029 <font class="keywordtype">long</font> handle; <font class="comment">/* -1 for failed rewind */</font>
00030 <font class="keyword">struct </font>_finddata_t info;
00031 <font class="keyword">struct </font>dirent result; <font class="comment">/* d_name null iff first time */</font>
00032 <font class="keywordtype">char</font> *name; <font class="comment">/* NTBS */</font>
00033 };
00034
00035 DIR *opendir(<font class="keyword">const</font> <font class="keywordtype">char</font> *name)
00036 {
00037 DIR *dir = 0;
00038
00039 <font class="keywordflow">if</font>(name && name[0])
00040 {
00041 size_t base_length = strlen(name);
00042 <font class="keyword">const</font> <font class="keywordtype">char</font> *all = <font class="comment">/* the root directory is a special case... */</font>
00043 strchr(<font class="stringliteral">"/\\"</font>, name[base_length - 1]) ? <font class="stringliteral">"*"</font> : <font class="stringliteral">"/*"</font>;
00044
00045 <font class="keywordflow">if</font>((dir = (DIR *) malloc(<font class="keyword">sizeof</font> *dir)) != 0 &&
00046 (dir->name = (<font class="keywordtype">char</font> *) malloc(base_length + strlen(all) + 1)) != 0)
00047 {
00048 strcat(strcpy(dir->name, name), all);
00049
00050 <font class="keywordflow">if</font>((dir->handle = _findfirst(dir->name, &dir->info)) != -1)
00051 {
00052 dir->result.d_name = 0;
00053 }
00054 <font class="keywordflow">else</font> <font class="comment">/* rollback */</font>
00055 {
00056 free(dir->name);
00057 free(dir);
00058 dir = 0;
00059 }
00060 }
00061 <font class="keywordflow">else</font> <font class="comment">/* rollback */</font>
00062 {
00063 free(dir);
00064 dir = 0;
00065 errno = ENOMEM;
00066 }
00067 }
00068 <font class="keywordflow">else</font>
00069 {
00070 errno = EINVAL;
00071 }
00072
00073 <font class="keywordflow">return</font> dir;
00074 }
00075
00076 <font class="keywordtype">int</font> closedir(DIR *dir)
00077 {
00078 <font class="keywordtype">int</font> result = -1;
00079
00080 <font class="keywordflow">if</font>(dir)
00081 {
00082 <font class="keywordflow">if</font>(dir->handle != -1)
00083 {
00084 result = _findclose(dir->handle);
00085 }
00086
00087 free(dir->name);
00088 free(dir);
00089 }
00090
00091 <font class="keywordflow">if</font>(result == -1) <font class="comment">/* map all errors to EBADF */</font>
00092 {
00093 errno = EBADF;
00094 }
00095
00096 <font class="keywordflow">return</font> result;
00097 }
00098
00099 <font class="keyword">struct </font>dirent *readdir(DIR *dir)
00100 {
00101 <font class="keyword">struct </font>dirent *result = 0;
00102
00103 <font class="keywordflow">if</font>(dir && dir->handle != -1)
00104 {
00105 <font class="keywordflow">if</font>(!dir->result.d_name || _findnext(dir->handle, &dir->info) != -1)
00106 {
00107 result = &dir->result;
00108 result->d_name = dir->info.name;
00109 }
00110 }
00111 <font class="keywordflow">else</font>
00112 {
00113 errno = EBADF;
00114 }
00115
00116 <font class="keywordflow">return</font> result;
00117 }
00118
00119 <font class="keywordtype">void</font> rewinddir(DIR *dir)
00120 {
00121 <font class="keywordflow">if</font>(dir && dir->handle != -1)
00122 {
00123 _findclose(dir->handle);
00124 dir->handle = _findfirst(dir->name, &dir->info);
00125 dir->result.d_name = 0;
00126 }
00127 <font class="keywordflow">else</font>
00128 {
00129 errno = EBADF;
00130 }
00131 }
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