debug.c revision 01e04c3f 
1/*
2 * Copyright © 2015 Intel Corporation
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
13 * Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
21 * IN THE SOFTWARE.
22 */
23
24#include <string.h>
25#include "main/macros.h"
26#include "debug.h"
27
28uint64_t
29parse_debug_string(const char *debug,
30                   const struct debug_control *control)
31{
32   uint64_t flag = 0;
33
34   if (debug != NULL) {
35      for (; control->string != NULL; control++) {
36         if (!strcmp(debug, "all")) {
37            flag |= control->flag;
38
39         } else {
40            const char *s = debug;
41            unsigned n;
42
43            for (; n = strcspn(s, ", "), *s; s += MAX2(1, n)) {
44               if (strlen(control->string) == n &&
45                   !strncmp(control->string, s, n))
46                  flag |= control->flag;
47            }
48         }
49      }
50   }
51
52   return flag;
53}
54
55/**
56 * Reads an environment variable and interprets its value as a boolean.
57 *
58 * Recognizes 0/false/no and 1/true/yes.  Other values result in the default value.
59 */
60bool
61env_var_as_boolean(const char *var_name, bool default_value)
62{
63   const char *str = getenv(var_name);
64   if (str == NULL)
65      return default_value;
66
67   if (strcmp(str, "1") == 0 ||
68       strcasecmp(str, "true") == 0 ||
69       strcasecmp(str, "yes") == 0) {
70      return true;
71   } else if (strcmp(str, "0") == 0 ||
72              strcasecmp(str, "false") == 0 ||
73              strcasecmp(str, "no") == 0) {
74      return false;
75   } else {
76      return default_value;
77   }
78}
79