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
29uint64_t
30parse_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
56bool
57comma_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 */
75bool
76env_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 */
100unsigned
101env_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