chiark / gitweb /
compute Sentence_Break as well
[disorder] / lib / snprintf.c
CommitLineData
460b9539 1/*
2 * This file is part of DisOrder
3 * Copyright (C) 2004 Richard Kettlewell
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
18 * USA
19 */
20
21#define NO_MEMORY_ALLOCATION
22/* because used from log.c */
23
24#include <config.h>
25#include "types.h"
26
27#include <stdio.h>
28#include <string.h>
29#include <stdarg.h>
30#include <stddef.h>
31
32#include "printf.h"
33#include "sink.h"
34
35struct fixedstr_sink {
36 struct sink s;
37 char *buffer;
38 int nbytes;
39 size_t size;
40};
41
42static int fixedstr_write(struct sink *f, const void *buffer, int nbytes) {
43 struct fixedstr_sink *s = (struct fixedstr_sink *)f;
44 int count;
45
46 if((size_t)s->nbytes < s->size) {
47 if((size_t)nbytes > s->size - s->nbytes)
48 count = s->size - s->nbytes;
49 else
50 count = nbytes;
51 memcpy(s->buffer + s->nbytes, buffer, count);
52 }
53 s->nbytes += nbytes;
54 return 0;
55}
56
57int byte_vsnprintf(char buffer[],
58 size_t bufsize,
59 const char *fmt,
60 va_list ap) {
61 struct fixedstr_sink s;
62 int n, m;
63
64 /* We have to make a sink directly here, since we can't safely do memory
65 * allocation here (we might be formatting the error message from a failed
66 * memory allocation) */
67 s.s.write = fixedstr_write;
68 s.buffer = buffer;
69 s.nbytes = 0;
70 s.size = bufsize;
71 n = byte_vsinkprintf(&s.s, fmt, ap);
72 if(bufsize) {
73 /* add the null terminator (even if the printf failed) */
74 m = s.nbytes;
75 if((size_t)m >= bufsize) m = bufsize - 1;
76 buffer[m] = 0;
77 }
78 return n;
79}
80
81int byte_snprintf(char buffer[], size_t bufsize, const char *fmt, ...) {
82 int n;
83 va_list ap;
84
85 va_start(ap, fmt);
86 n = byte_vsnprintf(buffer, bufsize, fmt, ap);
87 va_end(ap);
88 return n;
89}
90
91/*
92Local Variables:
93c-basic-offset:2
94comment-column:40
95End:
96*/