iod.c revision d1154eb460efe588eaed3d439c1caaca149fa362 
1/*
2 * iod.c		- Iterate a function on each entry of a directory
3 *
4 * Copyright (C) 1993, 1994  Remy Card <card@masi.ibp.fr>
5 *                           Laboratoire MASI, Institut Blaise Pascal
6 *                           Universite Pierre et Marie Curie (Paris VI)
7 *
8 * %Begin-Header%
9 * This file may be redistributed under the terms of the GNU Library
10 * General Public License, version 2.
11 * %End-Header%
12 */
13
14/*
15 * History:
16 * 93/10/30	- Creation
17 */
18
19#include "config.h"
20#include "e2p.h"
21#if HAVE_UNISTD_H
22#include <unistd.h>
23#endif
24#include <stdlib.h>
25#include <string.h>
26
27int iterate_on_dir (const char * dir_name,
28		    int (*func) (const char *, struct dirent *, void *),
29		    void * private)
30{
31	DIR * dir;
32	struct dirent *de, *dep;
33	int	max_len = -1, len, ret = 0;
34
35#if HAVE_PATHCONF && defined(_PC_NAME_MAX)
36	max_len = pathconf(dir_name, _PC_NAME_MAX);
37#endif
38	if (max_len == -1) {
39#ifdef _POSIX_NAME_MAX
40		max_len = _POSIX_NAME_MAX;
41#else
42#ifdef NAME_MAX
43		max_len = NAME_MAX;
44#else
45		max_len = 256;
46#endif /* NAME_MAX */
47#endif /* _POSIX_NAME_MAX */
48	}
49	max_len += sizeof(struct dirent);
50
51	de = malloc(max_len+1);
52	if (!de)
53		return -1;
54	memset(de, 0, max_len+1);
55
56	dir = opendir (dir_name);
57	if (dir == NULL) {
58		free(de);
59		return -1;
60	}
61	while ((dep = readdir (dir))) {
62#ifdef HAVE_RECLEN_DIRENT
63		len = dep->d_reclen;
64		if (len > max_len)
65			len = max_len;
66#else
67		len = sizeof(struct dirent);
68#endif
69		memcpy(de, dep, len);
70		if ((*func)(dir_name, de, private))
71			ret++;
72	}
73	free(de);
74	closedir(dir);
75	return ret;
76}
77