0
|
1 /* |
|
2 * buf-vprintf.c -- simple string buffer for C |
|
3 * |
|
4 * Copyright (c) 2019-2020 David Demelier <markand@malikania.fr> |
|
5 * |
|
6 * Permission to use, copy, modify, and/or distribute this software for any |
|
7 * purpose with or without fee is hereby granted, provided that the above |
|
8 * copyright notice and this permission notice appear in all copies. |
|
9 * |
|
10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
|
11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
|
12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR |
|
13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
|
14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
|
15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF |
|
16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
|
17 */ |
|
18 |
|
19 #include <assert.h> |
|
20 #include <stdio.h> |
|
21 |
|
22 #include "buf.h" |
|
23 #include "buf-int.h" |
|
24 |
|
25 bool |
|
26 buf_vprintf(struct buf *b, const char *fmt, va_list args) |
|
27 { |
|
28 assert(b); |
|
29 assert(fmt); |
|
30 |
|
31 va_list ap; |
|
32 int amount; |
|
33 |
|
34 /* Determine length. */ |
|
35 va_copy(ap, args); |
|
36 amount = vsnprintf(NULL, 0, fmt, ap); |
|
37 va_end(ap); |
|
38 |
|
39 if (amount < 0) |
|
40 return false; |
|
41 |
|
42 /* Do actual copy. */ |
|
43 if (!_buf_grow(b, amount)) |
|
44 return false; |
|
45 |
|
46 va_copy(ap, args); |
|
47 amount = vsprintf(&b->data[b->length], fmt, ap); |
|
48 va_end(ap); |
|
49 |
|
50 if (amount < 0) |
|
51 return false; |
|
52 |
|
53 b->length += amount; |
|
54 |
|
55 return true; |
|
56 } |