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glibc/dirent/scandir-tail.c
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/* Logic guts of scandir*. | |
Copyright (C) 1992-2015 Free Software Foundation, Inc. | |
This file is part of the GNU C Library. | |
The GNU C Library is free software; you can redistribute it and/or | |
modify it under the terms of the GNU Lesser General Public | |
License as published by the Free Software Foundation; either | |
version 2.1 of the License, or (at your option) any later version. | |
The GNU C Library is distributed in the hope that it will be useful, | |
but WITHOUT ANY WARRANTY; without even the implied warranty of | |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
Lesser General Public License for more details. | |
You should have received a copy of the GNU Lesser General Public | |
License along with the GNU C Library; if not, see | |
<http://www.gnu.org/licenses/>. */ | |
#include <dirent.h> | |
#include <errno.h> | |
#include <stdlib.h> | |
#include <string.h> | |
#include <libc-lock.h> | |
#ifndef SCANDIR_TAIL | |
# define SCANDIR_TAIL __scandir_tail | |
# define READDIR __readdir | |
# define DIRENT_TYPE struct dirent | |
#endif | |
internal_function | |
int | |
SCANDIR_TAIL (DIR *dp, | |
DIRENT_TYPE ***namelist, | |
int (*select) (const DIRENT_TYPE *), | |
int (*cmp) (const DIRENT_TYPE **, const DIRENT_TYPE **)) | |
{ | |
if (dp == NULL) | |
return -1; | |
int save = errno; | |
__set_errno (0); | |
int result; | |
struct scandir_cancel_struct c = { .dp = dp }; | |
__libc_cleanup_push (&__scandir_cancel_handler, &c); | |
DIRENT_TYPE **v = NULL; | |
size_t vsize = 0; | |
DIRENT_TYPE *d; | |
while ((d = READDIR (dp)) != NULL) | |
{ | |
if (select != NULL) | |
{ | |
int selected = (*select) (d); | |
/* The SELECT function might have changed errno. It was | |
zero before and it need to be again to make the later | |
tests work. */ | |
__set_errno (0); | |
if (!selected) | |
continue; | |
} | |
else | |
__set_errno (0); | |
if (__glibc_unlikely (c.cnt == vsize)) | |
{ | |
if (vsize == 0) | |
vsize = 10; | |
else | |
vsize *= 2; | |
DIRENT_TYPE **new = realloc (v, vsize * sizeof *v); | |
if (new == NULL) | |
break; | |
c.v = v = new; | |
} | |
size_t dsize = &d->d_name[_D_ALLOC_NAMLEN (d)] - (char *) d; | |
DIRENT_TYPE *vnew = malloc (dsize); | |
if (vnew == NULL) | |
break; | |
v[c.cnt++] = (DIRENT_TYPE *) memcpy (vnew, d, dsize); | |
} | |
if (__glibc_likely (errno == 0)) | |
{ | |
__closedir (dp); | |
/* Sort the list if we have a comparison function to sort with. */ | |
if (cmp != NULL) | |
qsort (v, c.cnt, sizeof *v, (__compar_fn_t) cmp); | |
*namelist = v; | |
result = c.cnt; | |
} | |
else | |
{ | |
/* This frees everything and calls closedir. */ | |
__scandir_cancel_handler (&c); | |
result = -1; | |
} | |
__libc_cleanup_pop (0); | |
if (result >= 0) | |
__set_errno (save); | |
return result; | |
} |