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1 | /* |
2 | * This file is part of DisOrder |
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3 | * Copyright (C) 2004, 2007, 2008 Richard Kettlewell |
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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 | |
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24 | #include "common.h" |
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25 | |
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26 | #include <stdarg.h> |
27 | #include <stddef.h> |
28 | |
29 | #include "printf.h" |
30 | #include "sink.h" |
31 | |
32 | struct fixedstr_sink { |
33 | struct sink s; |
34 | char *buffer; |
35 | int nbytes; |
36 | size_t size; |
37 | }; |
38 | |
39 | static int fixedstr_write(struct sink *f, const void *buffer, int nbytes) { |
40 | struct fixedstr_sink *s = (struct fixedstr_sink *)f; |
41 | int count; |
42 | |
43 | if((size_t)s->nbytes < s->size) { |
44 | if((size_t)nbytes > s->size - s->nbytes) |
45 | count = s->size - s->nbytes; |
46 | else |
47 | count = nbytes; |
48 | memcpy(s->buffer + s->nbytes, buffer, count); |
49 | } |
50 | s->nbytes += nbytes; |
51 | return 0; |
52 | } |
53 | |
54 | int byte_vsnprintf(char buffer[], |
55 | size_t bufsize, |
56 | const char *fmt, |
57 | va_list ap) { |
58 | struct fixedstr_sink s; |
59 | int n, m; |
60 | |
61 | /* We have to make a sink directly here, since we can't safely do memory |
62 | * allocation here (we might be formatting the error message from a failed |
63 | * memory allocation) */ |
64 | s.s.write = fixedstr_write; |
65 | s.buffer = buffer; |
66 | s.nbytes = 0; |
67 | s.size = bufsize; |
68 | n = byte_vsinkprintf(&s.s, fmt, ap); |
69 | if(bufsize) { |
70 | /* add the null terminator (even if the printf failed) */ |
71 | m = s.nbytes; |
72 | if((size_t)m >= bufsize) m = bufsize - 1; |
73 | buffer[m] = 0; |
74 | } |
75 | return n; |
76 | } |
77 | |
78 | int byte_snprintf(char buffer[], size_t bufsize, const char *fmt, ...) { |
79 | int n; |
80 | va_list ap; |
81 | |
82 | va_start(ap, fmt); |
83 | n = byte_vsnprintf(buffer, bufsize, fmt, ap); |
84 | va_end(ap); |
85 | return n; |
86 | } |
87 | |
88 | /* |
89 | Local Variables: |
90 | c-basic-offset:2 |
91 | comment-column:40 |
92 | End: |
93 | */ |