/** Copyright (C) 2000-2006 Erik Andersen <andersen@uclibc.org>** Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.*/#include <dirent.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <errno.h>
#include <sys/types.h>
#include "dirstream.h"int scandir(const char *dir, struct dirent ***namelist,int (*selector) (const struct dirent *),int (*compar) (const struct dirent **, const struct dirent **))
{DIR *dp = opendir (dir);struct dirent *current;struct dirent **names = NULL;size_t names_size = 0, pos;int save;if (dp == NULL)return -1;save = errno;__set_errno (0);pos = 0;while ((current = readdir (dp)) != NULL) {int use_it = selector == NULL;if (! use_it){use_it = (*selector) (current);/* The selector function might have changed errno.* It was zero before and it need to be again to make* the latter tests work.  */if (! use_it)__set_errno (0);}if (use_it){struct dirent *vnew;size_t dsize;/* Ignore errors from selector or readdir */__set_errno (0);if (unlikely(pos == names_size)){struct dirent **new;if (names_size == 0)names_size = 10;elsenames_size *= 2;new = (struct dirent **) realloc (names,names_size * sizeof (struct dirent *));if (new == NULL)break;names = new;}dsize = &current->d_name[_D_ALLOC_NAMLEN(current)] - (char*)current;vnew = (struct dirent *) malloc (dsize);if (vnew == NULL)break;names[pos++] = (struct dirent *) memcpy (vnew, current, dsize);}}if (unlikely(errno != 0)){save = errno;closedir (dp);while (pos > 0)free (names[--pos]);free (names);__set_errno (save);return -1;}closedir (dp);__set_errno (save);/* Sort the list if we have a comparison function to sort with.  */if (compar != NULL)qsort (names, pos, sizeof (struct dirent *), (comparison_fn_t) compar);*namelist = names;return pos;
}

#include <stdio.h>
#include <dirent.h>
#include <stdlib.h>
#include <unistd.h>static int select_files(const struct dirent *dirbuf)
{if (dirbuf->d_name[0] == '.')return 0;elsereturn 1;
}int main(void)
{struct dirent **array;struct dirent *dirbuf;int i, numdir;chdir("/");numdir = scandir(".", &array, select_files, NULL);printf("\nGot %d entries from scandir().\n", numdir);for (i = 0; i < numdir; ++i) {dirbuf = array[i];printf("[%d] %s\n", i, dirbuf->d_name);free(array[i]);}free(array);numdir = scandir(".", &array, select_files, alphasort);printf("\nGot %d entries from scandir() using alphasort().\n", numdir);for (i = 0; i < numdir; ++i) {dirbuf = array[i];printf("[%d] %s\n", i, dirbuf->d_name);}printf("\nCalling qsort()\n");/* Even though some manpages say that alphasort should be* int alphasort(const void *a, const void *b),* in reality glibc and uclibc have const struct dirent*** instead of const void*.* Therefore we get a warning here unless we use a cast,* which makes people think that alphasort prototype* needs to be fixed in uclibc headers.*/qsort(array, numdir, sizeof(struct dirent *), (void*) alphasort);for (i = 0; i < numdir; ++i) {dirbuf = array[i];printf("[%d] %s\n", i, dirbuf->d_name);free(array[i]);}free(array);return (0);
}

EXAMPLE#define _SVID_SOURCE/* print files in current directory in reverse order */#include <dirent.h>intmain(void){struct dirent **namelist;int n;n = scandir(".", &namelist, NULL, alphasort);if (n < 0)perror("scandir");else {while (n--) {printf("%s\n", namelist[n]->d_name);free(namelist[n]);}free(namelist);}}