1/*	$OpenBSD: debug.c,v 1.5 2018/09/26 08:33:22 miko Exp $	*/
2/*
3 * Copyright (c) 2011 Alexandre Ratchov <alex@caoua.org>
4 *
5 * Permission to use, copy, modify, and distribute this software for any
6 * purpose with or without fee is hereby granted, provided that the above
7 * copyright notice and this permission notice appear in all copies.
8 *
9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16 */
17
18#include <stdio.h>
19#include <stdlib.h>
20#include <unistd.h>
21
22#include "debug.h"
23
24#ifdef DEBUG
25/*
26 * debug level, -1 means uninitialized
27 */
28int _sndio_debug = -1;
29
30void
31_sndio_debug_init(void)
32{
33	char *dbg;
34
35	if (_sndio_debug < 0) {
36		dbg = issetugid() ? NULL : getenv("SNDIO_DEBUG");
37		if (!dbg || sscanf(dbg, "%u", &_sndio_debug) != 1)
38			_sndio_debug = 0;
39	}
40}
41#endif
42
43const char *
44_sndio_parsetype(const char *str, char *type)
45{
46	while (*type) {
47		if (*type != *str)
48			return NULL;
49		type++;
50		str++;
51	}
52	if (*str >= 'a' && *str <= 'z')
53		return NULL;
54	return str;
55}
56
57const char *
58_sndio_parsenum(const char *str, unsigned int *num, unsigned int max)
59{
60	const char *p = str;
61	unsigned int dig, maxq, maxr, val;
62
63	val = 0;
64	maxq = max / 10;
65	maxr = max % 10;
66	for (;;) {
67		dig = *p - '0';
68		if (dig >= 10)
69			break;
70		if (val > maxq || (val == maxq && dig > maxr)) {
71			DPRINTF("%s: number too large\n", str);
72			return NULL;
73		}
74		val = val * 10 + dig;
75		p++;
76	}
77	if (p == str) {
78		DPRINTF("%s: number expected\n", str);
79		return NULL;
80	}
81	*num = val;
82	return p;
83}
84