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6e16ed887e
2003-09-17 Jakub Jelinek <jakub@redhat.com>
* dirent/scandir.c: Include bits/libc-lock.h.
(struct scandir_cancel_struct): New type.
(cancel_handler): New function.
(SCANDIR): Add __libc_cleanup_{push,pop}, save state into
scandir_cancel_struct.
149 lines
3.2 KiB
C
149 lines
3.2 KiB
C
/* Copyright (C) 1992-1998, 2000, 2002, 2003 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <dirent.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <bits/libc-lock.h>
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#ifndef SCANDIR
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#define SCANDIR scandir
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#define READDIR __readdir
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#define DIRENT_TYPE struct dirent
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#endif
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#ifndef SCANDIR_CANCEL
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#define SCANDIR_CANCEL
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struct scandir_cancel_struct
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{
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DIR *dp;
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void *v;
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size_t cnt;
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};
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static void
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cancel_handler (void *arg)
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{
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struct scandir_cancel_struct *cp = arg;
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size_t i;
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void **v = cp->v;
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for (i = 0; i < cp->cnt; ++i)
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free (v[i]);
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free (v);
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(void) __closedir (cp->dp);
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}
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#endif
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int
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SCANDIR (dir, namelist, select, cmp)
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const char *dir;
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DIRENT_TYPE ***namelist;
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int (*select) (const DIRENT_TYPE *);
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int (*cmp) (const void *, const void *);
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{
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DIR *dp = __opendir (dir);
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DIRENT_TYPE **v = NULL;
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size_t vsize = 0;
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struct scandir_cancel_struct c;
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DIRENT_TYPE *d;
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int save;
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if (dp == NULL)
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return -1;
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save = errno;
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__set_errno (0);
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c.dp = dp;
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c.v = NULL;
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c.cnt = 0;
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__libc_cleanup_push (cancel_handler, &c);
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while ((d = READDIR (dp)) != NULL)
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{
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int use_it = select == NULL;
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if (! use_it)
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{
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use_it = select (d);
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/* The select function might have changed errno. It was
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zero before and it need to be again to make the latter
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tests work. */
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__set_errno (0);
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}
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if (use_it)
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{
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DIRENT_TYPE *vnew;
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size_t dsize;
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/* Ignore errors from select or readdir */
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__set_errno (0);
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if (__builtin_expect (c.cnt == vsize, 0))
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{
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DIRENT_TYPE **new;
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if (vsize == 0)
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vsize = 10;
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else
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vsize *= 2;
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new = (DIRENT_TYPE **) realloc (v, vsize * sizeof (*v));
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if (new == NULL)
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break;
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v = new;
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c.v = (void *) v;
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}
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dsize = &d->d_name[_D_ALLOC_NAMLEN (d)] - (char *) d;
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vnew = (DIRENT_TYPE *) malloc (dsize);
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if (vnew == NULL)
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break;
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v[c.cnt++] = (DIRENT_TYPE *) memcpy (vnew, d, dsize);
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}
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}
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if (__builtin_expect (errno, 0) != 0)
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{
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save = errno;
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while (c.cnt > 0)
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free (v[--c.cnt]);
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free (v);
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c.cnt = -1;
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}
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else
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{
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/* Sort the list if we have a comparison function to sort with. */
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if (cmp != NULL)
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qsort (v, c.cnt, sizeof (*v), cmp);
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*namelist = v;
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}
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__libc_cleanup_pop (0);
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(void) __closedir (dp);
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__set_errno (save);
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return c.cnt;
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}
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