blob: 18e2ce6fd270a313ef129301f3d47f666f12dfd2 [file] [log] [blame]
Thomas Martitz50a6ca32010-05-06 21:04:40 +00001/***************************************************************************
2 * __________ __ ___.
3 * Open \______ \ ____ ____ | | _\_ |__ _______ ___
4 * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
5 * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
6 * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
7 * \/ \/ \/ \/ \/
8 * $Id$
9 *
10 * Copyright (C) 2002 by Gary Czvitkovicz
11 *
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * as published by the Free Software Foundation; either version 2
15 * of the License, or (at your option) any later version.
16 *
17 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
18 * KIND, either express or implied.
19 *
20 ****************************************************************************/
21
22/*
23 * Minimal printf and snprintf formatting functions
24 *
25 * These support %c %s %d and %x
26 * Field width and zero-padding flag only
27 */
28
29#include <stdio.h>
30#include <stdarg.h>
31#include <stdbool.h>
32#include <limits.h>
33#include "format.h"
34
35/* ALSA library requires a more advanced snprintf, so let's not
36 override it in simulator for Linux. Note that Cygwin requires
37 our snprintf or it produces garbled output after a while. */
38
39struct for_snprintf {
40 unsigned char *ptr; /* where to store it */
41 size_t bytes; /* amount already stored */
42 size_t max; /* max amount to store */
43};
44
45static int sprfunc(void *ptr, unsigned char letter)
46{
47 struct for_snprintf *pr = (struct for_snprintf *)ptr;
48 if(pr->bytes < pr->max) {
49 *pr->ptr = letter;
50 pr->ptr++;
51 pr->bytes++;
52 return true;
53 }
54 return false; /* filled buffer */
55}
56
57
58int snprintf(char *buf, size_t size, const char *fmt, ...)
59{
Thomas Martitz50a6ca32010-05-06 21:04:40 +000060 va_list ap;
61 struct for_snprintf pr;
62
63 pr.ptr = (unsigned char *)buf;
64 pr.bytes = 0;
65 pr.max = size;
66
67 va_start(ap, fmt);
Rafaël Carré5a98ad22010-09-20 08:55:45 +000068 format(sprfunc, &pr, fmt, ap);
Thomas Martitz50a6ca32010-05-06 21:04:40 +000069 va_end(ap);
70
71 /* make sure it ends with a trailing zero */
72 pr.ptr[(pr.bytes < pr.max) ? 0 : -1] = '\0';
73
74 return pr.bytes;
75}
76
77int vsnprintf(char *buf, size_t size, const char *fmt, va_list ap)
78{
Thomas Martitz50a6ca32010-05-06 21:04:40 +000079 struct for_snprintf pr;
80
81 pr.ptr = (unsigned char *)buf;
82 pr.bytes = 0;
83 pr.max = size;
84
Rafaël Carré5a98ad22010-09-20 08:55:45 +000085 format(sprfunc, &pr, fmt, ap);
Thomas Martitz50a6ca32010-05-06 21:04:40 +000086
87 /* make sure it ends with a trailing zero */
88 pr.ptr[(pr.bytes < pr.max) ? 0 : -1] = '\0';
89
90 return pr.bytes;
91}