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 | |
35 | struct fixedstr_sink { |
36 | struct sink s; |
37 | char *buffer; |
38 | int nbytes; |
39 | size_t size; |
40 | }; |
41 | |
42 | static 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 | |
57 | int 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 | |
81 | int 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 | /* |
92 | Local Variables: |
93 | c-basic-offset:2 |
94 | comment-column:40 |
95 | End: |
96 | */ |