/* readdir.c
 *
 * COPYRIGHT (c) 1995 by AT&T Bell Laboratories.
 */

#include "ml-unixdep.h"
#include <sys/types.h>
#include <dirent.h>
#include <errno.h>
#include "ml-base.h"
#include "ml-values.h"
#include "tags.h"
#include "ml-objects.h"
#include "ml-c.h"
#include "cfun-proto-list.h"

/* _ml_P_FileSys_readdir : object -> string
 *
 * Return the next filename from the directory stream.
 */
ml_val_t _ml_P_FileSys_readdir (ml_state_t *msp, ml_val_t arg)
{
    struct dirent      *dirent;
    
    while (TRUE) {
	errno = 0;
	dirent = readdir(PTR_MLtoC(DIR, arg));
	if (dirent == NIL(struct dirent *)) {
	    if (errno != 0)     /* Error occurred */
		return RAISE_SYSERR(msp, -1);
	    else                /* End of stream */
		return ML_string0;
	}
	else {
	    char	*cp = dirent->d_name;
	    if ((cp[0] == '.')
	    && ((cp[1] == '\0') || ((cp[1] == '.') && (cp[2] == '\0'))))
		continue;
	    else
		return ML_CString (msp, cp);
	}
    }

} /* end of _ml_P_FileSys_readdir */