File: dirent.c

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/*

    Implementation of POSIX directory browsing functions and types for Win32.

    Kevlin Henney (mailto:kevlin@acm.org), March 1997.

    Copyright Kevlin Henney, 1997. All rights reserved.

    Permission to use, copy, modify, and distribute this software and its
    umentation for any purpose is hereby granted without fee, provided
    that this copyright and permissions notice appear in all copies and
    derivatives, and that no charge may be made for the software and its
    documentation except to cover cost of distribution.
    
    This software is supplied "as is" without express or implied warranty.

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

*/


#include "dirent.h"

DIR *opendir(const char *name)
{
    static DIR *dir = 0;

    if(name && name[0])
    {
        size_t base_length = strlen(name);
        const char *all = /* the root directory is a special case... */
            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;
    }

    return dir;
}

int closedir(DIR *dir)
{
    int result = -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;
    }

    return result;
}

struct dirent *readdir(DIR *dir)
{
    static struct dirent *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
			return(NULL);
    }
    else
    {
        errno = EBADF;
    }

    return result;
}

void rewinddir(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;
    }
}