src/util/debug.c

   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
  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
  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
  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
 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 }