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 <errno.h>
25 #include <string.h>
26 #include "debug.h"
27 #include "u_string.h"
28
29 uint64_t
parse_debug_string(const char * debug,const struct debug_control * control)30 parse_debug_string(const char *debug,
31 const struct debug_control *control)
32 {
33 uint64_t flag = 0;
34
35 if (debug != NULL) {
36 for (; control->string != NULL; control++) {
37 if (!strcmp(debug, "all")) {
38 flag |= control->flag;
39
40 } else {
41 const char *s = debug;
42 unsigned n;
43
44 for (; n = strcspn(s, ", "), *s; s += MAX2(1, n)) {
45 if (strlen(control->string) == n &&
46 !strncmp(control->string, s, n))
47 flag |= control->flag;
48 }
49 }
50 }
51 }
52
53 return flag;
54 }
55
56 bool
comma_separated_list_contains(const char * list,const char * s)57 comma_separated_list_contains(const char *list, const char *s)
58 {
59 assert(list);
60 const size_t len = strlen(s);
61
62 for (unsigned n; n = strcspn(list, ","), *list; list += MAX2(1, n)) {
63 if (n == len && !strncmp(list, s, n))
64 return true;
65 }
66
67 return false;
68 }
69
70 /**
71 * Reads an environment variable and interprets its value as a boolean.
72 *
73 * Recognizes 0/false/no and 1/true/yes. Other values result in the default value.
74 */
75 bool
env_var_as_boolean(const char * var_name,bool default_value)76 env_var_as_boolean(const char *var_name, bool default_value)
77 {
78 const char *str = getenv(var_name);
79 if (str == NULL)
80 return default_value;
81
82 if (strcmp(str, "1") == 0 ||
83 strcasecmp(str, "true") == 0 ||
84 strcasecmp(str, "y") == 0 ||
85 strcasecmp(str, "yes") == 0) {
86 return true;
87 } else if (strcmp(str, "0") == 0 ||
88 strcasecmp(str, "false") == 0 ||
89 strcasecmp(str, "n") == 0 ||
90 strcasecmp(str, "no") == 0) {
91 return false;
92 } else {
93 return default_value;
94 }
95 }
96
97 /**
98 * Reads an environment variable and interprets its value as a unsigned.
99 */
100 unsigned
env_var_as_unsigned(const char * var_name,unsigned default_value)101 env_var_as_unsigned(const char *var_name, unsigned default_value)
102 {
103 char *str = getenv(var_name);
104 if (str) {
105 char *end;
106 unsigned long result;
107
108 errno = 0;
109 result = strtoul(str, &end, 0);
110 if (errno == 0 && end != str && *end == '\0')
111 return result;
112 }
113 return default_value;
114 }
115