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 */
28 int _sndio_debug = -1;
29
30 void
_sndio_debug_init(void)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
43 const char *
_sndio_parsetype(const char * str,char * type)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
57 const char *
_sndio_parsenum(const char * str,unsigned int * num,unsigned int max)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