146 lines
3.1 KiB
C
146 lines
3.1 KiB
C
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/*
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Implementation of POSIX directory browsing functions and types for Win32.
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Author: Kevlin Henney (kevlin@acm.org, kevlin@curbralan.com)
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History: Created March 1997. Updated June 2003.
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Rights: See end of file.
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*/
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#include <dirent.h>
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#include <errno.h>
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#include <io.h> /* _findfirst and _findnext set errno iff they return -1 */
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#include <stdlib.h>
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#include <string.h>
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#ifdef __cplusplus
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extern "C"
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{
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#endif
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struct DIR
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{
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long handle; /* -1 for failed rewind */
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struct _finddata_t info;
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struct dirent result; /* d_name null iff first time */
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char *name; /* null-terminated char string */
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};
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DIR *opendir(const char *name)
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{
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DIR *dir = 0;
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if(name && name[0])
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{
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size_t base_length = strlen(name);
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const char *all = /* search pattern must end with suitable wildcard */
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strchr("/\\", name[base_length - 1]) ? "*" : "/*";
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if((dir = (DIR *) malloc(sizeof *dir)) != 0 &&
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(dir->name = (char *) malloc(base_length + strlen(all) + 1)) != 0)
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{
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strcat(strcpy(dir->name, name), all);
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if((dir->handle = (long) _findfirst(dir->name, &dir->info)) != -1)
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{
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dir->result.d_name = 0;
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}
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else /* rollback */
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{
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free(dir->name);
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free(dir);
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dir = 0;
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}
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}
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else /* rollback */
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{
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free(dir);
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dir = 0;
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errno = ENOMEM;
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}
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}
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else
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{
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errno = EINVAL;
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}
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return dir;
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}
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int closedir(DIR *dir)
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{
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int result = -1;
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if(dir)
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{
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if(dir->handle != -1)
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{
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result = _findclose(dir->handle);
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}
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free(dir->name);
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free(dir);
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}
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if(result == -1) /* map all errors to EBADF */
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{
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errno = EBADF;
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}
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return result;
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}
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struct dirent *readdir(DIR *dir)
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{
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struct dirent *result = 0;
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if(dir && dir->handle != -1)
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{
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if(!dir->result.d_name || _findnext(dir->handle, &dir->info) != -1)
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{
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result = &dir->result;
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result->d_name = dir->info.name;
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}
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}
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else
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{
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errno = EBADF;
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}
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return result;
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}
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void rewinddir(DIR *dir)
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{
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if(dir && dir->handle != -1)
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{
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_findclose(dir->handle);
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dir->handle = (long) _findfirst(dir->name, &dir->info);
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dir->result.d_name = 0;
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}
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else
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{
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errno = EBADF;
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}
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}
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#ifdef __cplusplus
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}
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#endif
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/*
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Copyright Kevlin Henney, 1997, 2003. All rights reserved.
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Permission to use, copy, modify, and distribute this software and its
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documentation for any purpose is hereby granted without fee, provided
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that this copyright and permissions notice appear in all copies and
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derivatives.
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This software is supplied "as is" without express or implied warranty.
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But that said, if there are any problems please get in touch.
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*/
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