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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 <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 }
     79