xref: /freebsd/tools/build/cross-build/fgetwln_fallback.c (revision 2e3507c25e42292b45a5482e116d278f5515d04d)
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 *
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