157 lines
4.3 KiB
C
157 lines
4.3 KiB
C
/*
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* Copyright © 2015 Intel Corporation
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*/
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#include <errno.h>
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#include <string.h>
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#include "debug.h"
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#include "u_string.h"
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uint64_t
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parse_debug_string(const char *debug,
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const struct debug_control *control)
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{
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uint64_t flag = 0;
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if (debug != NULL) {
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for (; control->string != NULL; control++) {
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if (!strcmp(debug, "all")) {
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flag |= control->flag;
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} else {
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const char *s = debug;
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unsigned n;
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for (; n = strcspn(s, ", "), *s; s += MAX2(1, n)) {
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if (strlen(control->string) == n &&
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!strncmp(control->string, s, n))
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flag |= control->flag;
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}
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}
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}
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}
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return flag;
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}
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uint64_t
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parse_enable_string(const char *debug,
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uint64_t default_value,
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const struct debug_control *control)
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{
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uint64_t flag = default_value;
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if (debug != NULL) {
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for (; control->string != NULL; control++) {
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if (!strcmp(debug, "all")) {
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flag |= control->flag;
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} else {
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const char *s = debug;
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unsigned n;
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for (; n = strcspn(s, ", "), *s; s += MAX2(1, n)) {
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bool enable;
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if (s[0] == '+') {
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enable = true;
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s++; n--;
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} else if (s[0] == '-') {
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enable = false;
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s++; n--;
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} else {
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enable = true;
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}
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if (strlen(control->string) == n &&
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!strncmp(control->string, s, n)) {
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if (enable)
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flag |= control->flag;
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else
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flag &= ~control->flag;
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}
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}
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}
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}
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}
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return flag;
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}
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bool
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comma_separated_list_contains(const char *list, const char *s)
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{
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assert(list);
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const size_t len = strlen(s);
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for (unsigned n; n = strcspn(list, ","), *list; list += MAX2(1, n)) {
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if (n == len && !strncmp(list, s, n))
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return true;
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}
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return false;
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}
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/**
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* Reads an environment variable and interprets its value as a boolean.
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*
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* Recognizes 0/false/no and 1/true/yes. Other values result in the default value.
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*/
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bool
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env_var_as_boolean(const char *var_name, bool default_value)
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{
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const char *str = getenv(var_name);
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if (str == NULL)
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return default_value;
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if (strcmp(str, "1") == 0 ||
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strcasecmp(str, "true") == 0 ||
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strcasecmp(str, "y") == 0 ||
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strcasecmp(str, "yes") == 0) {
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return true;
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} else if (strcmp(str, "0") == 0 ||
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strcasecmp(str, "false") == 0 ||
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strcasecmp(str, "n") == 0 ||
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strcasecmp(str, "no") == 0) {
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return false;
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} else {
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return default_value;
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}
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}
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/**
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* Reads an environment variable and interprets its value as a unsigned.
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*/
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unsigned
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env_var_as_unsigned(const char *var_name, unsigned default_value)
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{
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char *str = getenv(var_name);
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if (str) {
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char *end;
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unsigned long result;
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errno = 0;
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result = strtoul(str, &end, 0);
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if (errno == 0 && end != str && *end == '\0')
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return result;
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}
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return default_value;
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}
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