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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 
28 uint64_t
parse_debug_string(const char * debug,const struct debug_control * control)29 parse_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  */
60 bool
env_var_as_boolean(const char * var_name,bool default_value)61 env_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