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#include <errno.h>

#include <stdlib.h>

#include <string.h>

#include <fcntl.h>

#include <unistd.h>

#include <sys/dir.h>

#include <sys/stat.h>

#include "dirstream.h"

/* opendir just makes an open() call - it return NULL if it fails

 * (open sets errno), otherwise it returns a DIR * pointer.

 */

DIR *opendir(const char *name)

{

        int fd;

        struct stat statbuf;

        char *buf;

        DIR *ptr;

        if (stat(name, &statbuf))

                return NULL;

        if (!S_ISDIR(statbuf.st_mode)) {

                __set_errno(ENOTDIR);

                return NULL;

        }

        if ((fd = open(name, O_RDONLY)) < 0)

                return NULL;

        /* According to POSIX, directory streams should be closed when

         * exec. From "Anna Pluzhnikov" <besp@midway.uchicago.edu>.

         */

        if (fcntl(fd, F_SETFD, FD_CLOEXEC) < 0)

                return NULL;

        if (!(ptr = malloc(sizeof(*ptr)))) {

                close(fd);

                __set_errno(ENOMEM);

                return NULL;

        }

        ptr->dd_fd = fd;

        ptr->dd_nextloc = ptr->dd_size = ptr->dd_nextoff = 0;

        ptr->dd_max = statbuf.st_blksize;

        if (ptr->dd_max < 512)

                ptr->dd_max = 512;

        if (!(buf = calloc(1, ptr->dd_max))) {

                close(fd);

                free(ptr);

                __set_errno(ENOMEM);

                return NULL;

        }

        ptr->dd_buf = buf;

#ifdef __UCLIBC_HAS_THREADS__

        __pthread_mutex_init(&(ptr->dd_lock), NULL);

#endif

        return ptr;

}