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