1/*
2 * Copyright 2012 Guillem Jover <guillem@hadrons.org>
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 *    notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 *    notice, this list of conditions and the following disclaimer in the
11 *    documentation and/or other materials provided with the distribution.
12 * 3. The name of the author may not be used to endorse or promote products
13 *    derived from this software without specific prior written permission.
14 *
15 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
16 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
17 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
18 * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
19 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
20 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
21 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
22 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
23 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
24 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
28
29#include <stdlib.h>
30#include <stdio.h>
31#include <wchar.h>
32
33#include "local-link.h"
34
35struct filewbuf {
36	FILE *fp;
37	wchar_t *wbuf;
38	size_t len;
39};
40
41#define FILEWBUF_INIT_LEN	128
42#define FILEWBUF_POOL_ITEMS	32
43
44static struct filewbuf fb_pool[FILEWBUF_POOL_ITEMS];
45static int fb_pool_cur;
46
47wchar_t *
48fgetwln(FILE *stream, size_t *lenp)
49{
50	struct filewbuf *fb;
51	wint_t wc;
52	size_t wused = 0;
53
54	/* Try to diminish the possibility of several fgetwln() calls being
55	 * used on different streams, by using a pool of buffers per file. */
56	fb = &fb_pool[fb_pool_cur];
57	if (fb->fp != stream && fb->fp != NULL) {
58		fb_pool_cur++;
59		fb_pool_cur %= FILEWBUF_POOL_ITEMS;
60		fb = &fb_pool[fb_pool_cur];
61	}
62	fb->fp = stream;
63
64	while ((wc = fgetwc(stream)) != WEOF) {
65		if (!fb->len || wused >= fb->len) {
66			wchar_t *wp;
67
68			if (fb->len)
69				fb->len *= 2;
70			else
71				fb->len = FILEWBUF_INIT_LEN;
72
73			wp = reallocarray(fb->wbuf, fb->len, sizeof(wchar_t));
74			if (wp == NULL) {
75				wused = 0;
76				break;
77			}
78			fb->wbuf = wp;
79		}
80
81		fb->wbuf[wused++] = wc;
82
83		if (wc == L'\n')
84			break;
85	}
86
87	*lenp = wused;
88	return wused ? fb->wbuf : NULL;
89}
90
91libbsd_link_warning(fgetwln,
92                    "This function cannot be safely ported, use fgetwc(3) "
93                    "instead, as it is supported by C99 and POSIX.1-2001.")
94