1 /*
2
3 Implementation of POSIX directory browsing functions and types for Win32.
4
5 Author: Kevlin Henney (kevlin@acm.org, kevlin@curbralan.com)
6 History: Created March 1997. Updated June 2003 and July 2012.
7 Rights: See end of file.
8
9 */
10
11 #include "precompiled.h"
12
13 #include "dirent.h"
14 #include <errno.h>
15 #include <io.h> /* _findfirst and _findnext set errno iff they return -1 */
16 #include <stdlib.h>
17 #include <string.h>
18
19 #ifdef __cplusplus
20 extern "C"
21 {
22 #endif
23
24 typedef ptrdiff_t handle_type; /* C99's intptr_t not sufficiently portable */
25
26 struct DIR
27 {
28 handle_type handle; /* -1 for failed rewind */
29 struct _finddata_t info;
30 struct dirent result; /* d_name null iff first time */
31 char *name; /* null-terminated char string */
32 };
33
opendir(const char * name)34 DIR *opendir(const char *name)
35 {
36 DIR *dir = 0;
37
38 if(name && name[0])
39 {
40 size_t base_length = strlen(name);
41 const char *all = /* search pattern must end with suitable wildcard */
42 strchr("/\\", name[base_length - 1]) ? "*" : "/*";
43
44 if((dir = (DIR *) malloc(sizeof *dir)) != 0 &&
45 (dir->name = (char *) malloc(base_length + strlen(all) + 1)) != 0)
46 {
47 strcat(strcpy(dir->name, name), all);
48
49 if((dir->handle =
50 (handle_type) _findfirst(dir->name, &dir->info)) != -1)
51 {
52 dir->result.d_name = 0;
53 }
54 else /* rollback */
55 {
56 free(dir->name);
57 free(dir);
58 dir = 0;
59 }
60 }
61 else /* rollback */
62 {
63 free(dir);
64 dir = 0;
65 errno = ENOMEM;
66 }
67 }
68 else
69 {
70 errno = EINVAL;
71 }
72
73 return dir;
74 }
75
closedir(DIR * dir)76 int closedir(DIR *dir)
77 {
78 int result = -1;
79
80 if(dir)
81 {
82 if(dir->handle != -1)
83 {
84 result = _findclose(dir->handle);
85 }
86
87 free(dir->name);
88 free(dir);
89 }
90
91 if(result == -1) /* map all errors to EBADF */
92 {
93 errno = EBADF;
94 }
95
96 return result;
97 }
98
readdir(DIR * dir)99 struct dirent *readdir(DIR *dir)
100 {
101 struct dirent *result = 0;
102
103 if(dir && dir->handle != -1)
104 {
105 if(!dir->result.d_name || _findnext(dir->handle, &dir->info) != -1)
106 {
107 result = &dir->result;
108 result->d_name = dir->info.name;
109 }
110 }
111 else
112 {
113 errno = EBADF;
114 }
115
116 return result;
117 }
118
rewinddir(DIR * dir)119 void rewinddir(DIR *dir)
120 {
121 if(dir && dir->handle != -1)
122 {
123 _findclose(dir->handle);
124 dir->handle = (handle_type) _findfirst(dir->name, &dir->info);
125 dir->result.d_name = 0;
126 }
127 else
128 {
129 errno = EBADF;
130 }
131 }
132
133 #ifdef __cplusplus
134 }
135 #endif
136
137 /*
138
139 Copyright Kevlin Henney, 1997, 2003, 2012. All rights reserved.
140
141 Permission to use, copy, modify, and distribute this software and its
142 documentation for any purpose is hereby granted without fee, provided
143 that this copyright and permissions notice appear in all copies and
144 derivatives.
145
146 This software is supplied "as is" without express or implied warranty.
147
148 But that said, if there are any problems please get in touch.
149
150 */
151