dsynth - Set pty cols and finally fix ^M in handshake
[dragonfly.git] / lib / libc / stdio / vsnprintf.c
CommitLineData
984263bc
MD
1/*-
2 * Copyright (c) 1990, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * Chris Torek.
7 *
0d5acd74
JM
8 * Copyright (c) 2011 The FreeBSD Foundation
9 * All rights reserved.
10 * Portions of this software were developed by David Chisnall
11 * under sponsorship from the FreeBSD Foundation.
12 *
984263bc
MD
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
15 * are met:
16 * 1. Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution.
dc71b7ab 21 * 3. Neither the name of the University nor the names of its contributors
984263bc
MD
22 * may be used to endorse or promote products derived from this software
23 * without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * SUCH DAMAGE.
1de703da
MD
36 *
37 * @(#)vsnprintf.c 8.1 (Berkeley) 6/4/93
0d5acd74 38 * $FreeBSD: head/lib/libc/stdio/vsnprintf.c 249808 2013-04-23 13:33:13Z emaste $
984263bc
MD
39 */
40
0d5acd74
JM
41
42#include <errno.h>
984263bc
MD
43#include <limits.h>
44#include <stdio.h>
17ea2221 45#include "local.h"
0d5acd74 46#include "xlocale_private.h"
984263bc
MD
47
48int
0d5acd74
JM
49vsnprintf_l(char * __restrict str, size_t n, locale_t locale,
50 const char * __restrict fmt, __va_list ap)
984263bc
MD
51{
52 size_t on;
53 int ret;
d3036032 54 char dummy[2];
0d5acd74
JM
55 FILE f = FAKE_FILE;
56 FIX_LOCALE(locale);
984263bc
MD
57
58 on = n;
59 if (n != 0)
60 n--;
0d5acd74
JM
61 if (n > INT_MAX) {
62 errno = EOVERFLOW;
63 *str = '\0';
64 return (EOF);
65 }
984263bc
MD
66 /* Stdio internals do not deal correctly with zero length buffer */
67 if (n == 0) {
d3036032
MD
68 if (on > 0)
69 *str = '\0';
70 str = dummy;
e0f95098 71 n = 1;
984263bc 72 }
55b5af84
JS
73 f.pub._flags = __SWR | __SSTR;
74 f._bf._base = f.pub._p = (unsigned char *)str;
75 f._bf._size = f.pub._w = n;
0d5acd74 76 ret = __vfprintf(&f, locale, fmt, ap);
984263bc 77 if (on > 0)
55b5af84 78 *f.pub._p = '\0';
984263bc
MD
79 return (ret);
80}
0d5acd74
JM
81int
82vsnprintf(char * __restrict str, size_t n, const char * __restrict fmt,
83 __va_list ap)
84{
85 return vsnprintf_l(str, n, __get_locale(), fmt, ap);
86}