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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 <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