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