update from main archive 960927
[glibc.git] / dirent / scandir.c
blobcffe5056ac2339601ec802e31a2f58d48581a52e
1 /* Copyright (C) 1992, 1993, 1994, 1995, 1996 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Library General Public License as
6 published by the Free Software Foundation; either version 2 of the
7 License, or (at your option) any later version.
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Library General Public License for more details.
14 You should have received a copy of the GNU Library General Public
15 License along with the GNU C Library; see the file COPYING.LIB. If
16 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
17 Cambridge, MA 02139, USA. */
19 #include <dirent.h>
20 #include <stdlib.h>
21 #include <string.h>
22 #include <errno.h>
24 int
25 scandir (dir, namelist, select, cmp)
26 const char *dir;
27 struct dirent ***namelist;
28 int (*select) __P ((struct dirent *));
29 int (*cmp) __P ((const void *, const void *));
31 DIR *dp = opendir (dir);
32 struct dirent **v = NULL;
33 size_t vsize = 0, i;
34 struct dirent *d;
35 int save;
37 if (dp == NULL)
38 return -1;
40 save = errno;
41 __set_errno (0);
43 i = 0;
44 while ((d = readdir (dp)) != NULL)
45 if (select == NULL || (*select) (d))
47 size_t dsize;
49 if (i == vsize)
51 struct dirent **new;
52 if (vsize == 0)
53 vsize = 10;
54 else
55 vsize *= 2;
56 new = (struct dirent **) realloc (v, vsize * sizeof (*v));
57 if (new == NULL)
59 lose:
60 __set_errno (ENOMEM);
61 break;
63 v = new;
66 dsize = &d->d_name[_D_ALLOC_NAMLEN (d)] - (char *) d;
67 v[i] = (struct dirent *) malloc (dsize);
68 if (v[i] == NULL)
69 goto lose;
71 memcpy (v[i++], d, dsize);
74 if (errno != 0)
76 save = errno;
77 (void) closedir (dp);
78 while (i > 0)
79 free (v[--i]);
80 free (v);
81 __set_errno (save);
82 return -1;
85 (void) closedir (dp);
86 __set_errno (save);
88 /* Sort the list if we have a comparison function to sort with. */
89 if (cmp != NULL)
90 qsort (v, i, sizeof (*v), cmp);
91 *namelist = v;
92 return i;