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[kugel-rb.git] / firmware / libc / sprintf.c
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1 /***************************************************************************
2 * __________ __ ___.
3 * Open \______ \ ____ ____ | | _\_ |__ _______ ___
4 * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
5 * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
6 * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
7 * \/ \/ \/ \/ \/
8 * $Id$
10 * Copyright (C) 2002 by Gary Czvitkovicz
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.
17 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
18 * KIND, either express or implied.
20 ****************************************************************************/
23 * Minimal printf and snprintf formatting functions
25 * These support %c %s %d and %x
26 * Field width and zero-padding flag only
29 #include <stdio.h>
30 #include <stdarg.h>
31 #include <stdbool.h>
32 #include <limits.h>
33 #include "format.h"
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. */
39 struct 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 */
45 static int sprfunc(void *ptr, unsigned char letter)
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;
54 return false; /* filled buffer */
58 int snprintf(char *buf, size_t size, const char *fmt, ...)
60 bool ok;
61 va_list ap;
62 struct for_snprintf pr;
64 pr.ptr = (unsigned char *)buf;
65 pr.bytes = 0;
66 pr.max = size;
68 va_start(ap, fmt);
69 ok = format(sprfunc, &pr, fmt, ap);
70 va_end(ap);
72 /* make sure it ends with a trailing zero */
73 pr.ptr[(pr.bytes < pr.max) ? 0 : -1] = '\0';
75 return pr.bytes;
78 int vsnprintf(char *buf, size_t size, const char *fmt, va_list ap)
80 bool ok;
81 struct for_snprintf pr;
83 pr.ptr = (unsigned char *)buf;
84 pr.bytes = 0;
85 pr.max = size;
87 ok = format(sprfunc, &pr, fmt, ap);
89 /* make sure it ends with a trailing zero */
90 pr.ptr[(pr.bytes < pr.max) ? 0 : -1] = '\0';
92 return pr.bytes;