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
35 struct 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
44 static struct filewbuf fb_pool[FILEWBUF_POOL_ITEMS];
45 static int fb_pool_cur;
46
47 wchar_t *
fgetwln(FILE * stream,size_t * lenp)48 fgetwln(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
91 libbsd_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