support streaming from custom raw format
[megadrive.git] / teensy3 / nonstd.c
CommitLineData
35f00b6c 1/* Teensyduino Core Library
2 * http://www.pjrc.com/teensy/
3 * Copyright (c) 2013 PJRC.COM, LLC.
4 *
5 * Permission is hereby granted, free of charge, to any person obtaining
6 * a copy of this software and associated documentation files (the
7 * "Software"), to deal in the Software without restriction, including
8 * without limitation the rights to use, copy, modify, merge, publish,
9 * distribute, sublicense, and/or sell copies of the Software, and to
10 * permit persons to whom the Software is furnished to do so, subject to
11 * the following conditions:
12 *
13 * 1. The above copyright notice and this permission notice shall be
14 * included in all copies or substantial portions of the Software.
15 *
16 * 2. If the Software is incorporated into a build system that allows
17 * selection among a list of target devices, then similar target
18 * devices manufactured by PJRC.COM must be included in the list of
19 * target devices and selectable in the same manner.
20 *
21 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
22 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
23 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
24 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
25 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
26 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
27 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
28 * SOFTWARE.
29 */
30
31#include "avr_functions.h"
32#include <string.h>
33#include <stdio.h>
34
35size_t strlen(const char *s)
36{
37 size_t n=0;
38
39 while (*s++) n++;
40 return n;
41}
42
43
44char * ultoa(unsigned long val, char *buf, int radix)
45{
46 unsigned digit;
47 int i=0, j;
48 char t;
49
50 while (1) {
51 digit = val % radix;
52 buf[i] = ((digit < 10) ? '0' + digit : 'A' + digit - 10);
53 val /= radix;
54 if (val == 0) break;
55 i++;
56 }
57 buf[i + 1] = 0;
58 for (j=0; j < i; j++, i--) {
59 t = buf[j];
60 buf[j] = buf[i];
61 buf[i] = t;
62 }
63 return buf;
64}
65
66char * ltoa(long val, char *buf, int radix)
67{
68 if (val >= 0) {
69 return ultoa(val, buf, radix);
70 } else {
71 buf[0] = '-';
72 ultoa(-val, buf + 1, radix);
73 return buf;
74 }
75}
76
77// TODO: actually write an efficient dtostrf()....
78char * dtostrf(float val, int width, unsigned int precision, char *buf)
79{
80 char format[20];
81 sprintf(format, "%%%d.%df", width, precision);
82 sprintf(buf, format, val);
83 return buf;
84}
85