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 <string.h>
  25 #include "main/macros.h"
  26 #include "debug.h"
  27
  28 uint64_t
  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
  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 }