dirent.c

/*

 Implementation of POSIX directory browsing functions and types for Win32.

 Author: Kevlin Henney (kevlin@acm.org, kevlin@curbralan.com)
 History: Created March 1997. Updated February 2003.
 Rights: See end of file.

*/

#include"dirent.h"
#include<errno.h>
#include<io.h>/* _findfirst and _findnext set errno iff they return -1 */
#include<stdlib.h>
#include<string.h>

structDIR
{
longhandle; /* -1 for failed rewind */
struct_finddata_tinfo;
structdirentresult; /* d_name null iff first time */
char*name; /* null-terminated char string */
};

DIR*opendir(constchar*name)
{
DIR*dir=0;

if(name&&name[0])
 {
size_tbase_length=strlen(name);
constchar*all=/* search pattern must end with suitable wildcard */
strchr("/\\", name[base_length-1]) ? "*" : "/*";

if((dir= (DIR*) malloc(sizeof*dir)) !=0&&
 (dir->name= (char*) malloc(base_length+strlen(all) +1)) !=0)
 {
strcat(strcpy(dir->name, name), all);

if((dir->handle=_findfirst(dir->name, &dir->info)) !=-1)
 {
dir->result.d_name=0;
 }
else/* rollback */
 {
free(dir->name);
free(dir);
dir=0;
 }
 }
else/* rollback */
 {
free(dir);
dir=0;
errno=ENOMEM;
 }
 }
else
 {
errno=EINVAL;
 }

returndir;
}

intclosedir(DIR*dir)
{
intresult=-1;

if(dir)
 {
if(dir->handle!=-1)
 {
result=_findclose(dir->handle);
 }

free(dir->name);
free(dir);
 }

if(result==-1) /* map all errors to EBADF */
 {
errno=EBADF;
 }

returnresult;
}

structdirent*readdir(DIR*dir)
{
structdirent*result=0;

if(dir&&dir->handle!=-1)
 {
if(!dir->result.d_name||_findnext(dir->handle, &dir->info) !=-1)
 {
result=&dir->result;
result->d_name=dir->info.name;
 }
 }
else
 {
errno=EBADF;
 }

returnresult;
}

voidrewinddir(DIR*dir)
{
if(dir&&dir->handle!=-1)
 {
_findclose(dir->handle);
dir->handle=_findfirst(dir->name, &dir->info);
dir->result.d_name=0;
 }
else
 {
errno=EBADF;
 }
}

/*

 Copyright Kevlin Henney, 1997, 2003. All rights reserved.

 Permission to use, copy, modify, and distribute this software and its
 documentation for any purpose is hereby granted without fee, provided
 that this copyright and permissions notice appear in all copies and
 derivatives.

 This software is supplied "as is" without express or implied warranty.

 But that said, if there are any problems please get in touch.

*/