[279] | 1 | /*
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| 2 |
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| 3 | Implementation of POSIX directory browsing functions and types for Win32.
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| 4 |
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| 5 | Author: Kevlin Henney (kevlin@acm.org, kevlin@curbralan.com)
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| 6 | History: Created March 1997. Updated June 2003 and July 2012.
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| 7 | Rights: See end of file.
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| 8 |
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| 9 | */
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| 10 |
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| 11 | #include <errno.h>
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| 12 | #include <io.h> /* _findfirst and _findnext set errno iff they return -1 */
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| 13 | #include <stdlib.h>
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| 14 | #include <string.h>
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| 15 |
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| 16 | #ifdef __cplusplus
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| 17 | extern "C"
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| 18 | {
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| 19 | #endif
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| 20 |
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| 21 | typedef ptrdiff_t handle_type; /* C99's intptr_t not sufficiently portable */
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| 22 |
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| 23 | struct dirent
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| 24 | {
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| 25 | char *d_name;
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| 26 | };
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| 27 |
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| 28 | struct DIR
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| 29 | {
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| 30 | handle_type handle; /* -1 for failed rewind */
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| 31 | struct _finddata_t info;
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| 32 | struct dirent result; /* d_name null iff first time */
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| 33 | char *name; /* null-terminated char string */
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| 34 | };
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| 35 |
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| 36 | typedef struct DIR DIR;
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| 37 |
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| 38 | DIR *opendir(const char *name)
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| 39 | {
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| 40 | DIR *dir = 0;
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| 41 |
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| 42 | if(name && name[0])
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| 43 | {
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| 44 | size_t base_length = strlen(name);
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| 45 | const char *all = /* search pattern must end with suitable wildcard */
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| 46 | strchr("/\\", name[base_length - 1]) ? "*" : "/*";
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| 47 |
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| 48 | if((dir = (DIR *) malloc(sizeof *dir)) != 0 &&
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| 49 | (dir->name = (char *) malloc(base_length + strlen(all) + 1)) != 0)
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| 50 | {
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| 51 | strcat(strcpy(dir->name, name), all);
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| 52 |
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| 53 | if((dir->handle =
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| 54 | (handle_type) _findfirst(dir->name, &dir->info)) != -1)
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| 55 | {
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| 56 | dir->result.d_name = 0;
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| 57 | }
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| 58 | else /* rollback */
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| 59 | {
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| 60 | free(dir->name);
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| 61 | free(dir);
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| 62 | dir = 0;
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| 63 | }
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| 64 | }
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| 65 | else /* rollback */
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| 66 | {
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| 67 | free(dir);
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| 68 | dir = 0;
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| 69 | errno = ENOMEM;
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| 70 | }
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| 71 | }
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| 72 | else
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| 73 | {
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| 74 | errno = EINVAL;
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| 75 | }
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| 76 |
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| 77 | return dir;
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| 78 | }
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| 79 |
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| 80 | int closedir(DIR *dir)
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| 81 | {
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| 82 | int result = -1;
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| 83 |
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| 84 | if(dir)
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| 85 | {
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| 86 | if(dir->handle != -1)
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| 87 | {
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| 88 | result = _findclose(dir->handle);
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| 89 | }
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| 90 |
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| 91 | free(dir->name);
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| 92 | free(dir);
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| 93 | }
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| 94 |
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| 95 | if(result == -1) /* map all errors to EBADF */
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| 96 | {
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| 97 | errno = EBADF;
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| 98 | }
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| 99 |
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| 100 | return result;
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| 101 | }
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| 102 |
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| 103 | struct dirent *readdir(DIR *dir)
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| 104 | {
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| 105 | struct dirent *result = 0;
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| 106 |
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| 107 | if(dir && dir->handle != -1)
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| 108 | {
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| 109 | if(!dir->result.d_name || _findnext(dir->handle, &dir->info) != -1)
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| 110 | {
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| 111 | result = &dir->result;
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| 112 | result->d_name = dir->info.name;
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| 113 | }
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| 114 | }
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| 115 | else
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| 116 | {
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| 117 | errno = EBADF;
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| 118 | }
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| 119 |
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| 120 | return result;
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| 121 | }
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| 122 |
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| 123 | void rewinddir(DIR *dir)
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| 124 | {
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| 125 | if(dir && dir->handle != -1)
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| 126 | {
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| 127 | _findclose(dir->handle);
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| 128 | dir->handle = (handle_type) _findfirst(dir->name, &dir->info);
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| 129 | dir->result.d_name = 0;
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| 130 | }
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| 131 | else
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| 132 | {
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| 133 | errno = EBADF;
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| 134 | }
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| 135 | }
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| 136 |
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| 137 | #ifdef __cplusplus
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| 138 | }
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| 139 | #endif
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| 140 |
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| 141 | /*
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| 142 |
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| 143 | Copyright Kevlin Henney, 1997, 2003, 2012. All rights reserved.
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| 144 |
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| 145 | Permission to use, copy, modify, and distribute this software and its
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| 146 | documentation for any purpose is hereby granted without fee, provided
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| 147 | that this copyright and permissions notice appear in all copies and
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| 148 | derivatives.
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| 149 |
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| 150 | This software is supplied "as is" without express or implied warranty.
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| 151 |
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| 152 | But that said, if there are any problems please get in touch.
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| 153 |
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| 154 | */
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