dirent.c File Reference

#include "dirent.h"
#include <errno.h>
#include <io.h>
#include <stdlib.h>
#include <string.h>

Include dependency graph for dirent.c:

Classes
struct	DIR

Typedefs
typedef ptrdiff_t	handle_type

Functions
DIR *	opendir (const char *name)
int	closedir (DIR *dir)
struct dirent *	readdir (DIR *dir)
void	rewinddir (DIR *dir)

Typedef Documentation

typedef ptrdiff_t handle_type

Function Documentation

DIR* opendir

(

const char *

name

)

{
    DIR *dir = 0;

    if(name && name[0])
    {
        size_t base_length = strlen(name);
        const char *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 =
                (handle_type) _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

)

{
    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
    {
        errno = EBADF;
    }

    return result;
}

void rewinddir

(

DIR *

dir

)

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