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/*
* scandir.c: scandir
*/
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <dirent.h>
int scandir(const char *dirp, struct dirent ***namelist,
int (*filter)(const struct dirent *),
int (*compar)(const struct dirent **, const struct dirent **))
{
struct dirent **nl = NULL, **next_nl;
struct dirent *dirent;
size_t count = 0;
size_t allocated = 0;
DIR *dir;
dir = opendir(dirp);
if (!dir)
return -1;
while (1) {
dirent = readdir(dir);
if (!dirent)
break;
if (!filter || filter(dirent)) {
struct dirent *copy;
copy = malloc(sizeof(*copy));
if (!copy)
goto cleanup_fail;
memcpy(copy, dirent, sizeof(*copy));
/* Extend the array if needed */
if (count == allocated) {
if (allocated == 0)
allocated = 15; /* ~1 page worth */
else
allocated *= 2;
next_nl = realloc(nl, allocated);
if (!next_nl) {
free(copy);
goto cleanup_fail;
}
nl = next_nl;
}
nl[count++] = copy;
}
}
qsort(nl, count, sizeof(struct dirent *),
(int (*)(const void *, const void *))compar);
closedir(dir);
*namelist = nl;
return count;
cleanup_fail:
while (count) {
dirent = nl[--count];
free(dirent);
}
free(nl);
closedir(dir);
errno = ENOMEM;
return -1;
}
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