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/*
* environment.c
*
* Environment utility functions.
*
* Copyright 1999-2012 Gentoo Foundation
* Licensed under the GPL-2
*/
#include "headers.h"
#include "sbutil.h"
static const char * const true_values[] = {
"1", "true", "yes", NULL,
};
static const char * const false_values[] = {
"0", "false", "no", NULL,
};
static bool val_is_in(const char *val, const char * const values[])
{
size_t i = 0;
while (values[i])
if (!strcasecmp(val, values[i++]))
return true;
return false;
}
static bool env_is_in(const char *env, const char * const values[], bool *set)
{
const char *val;
if (unlikely(!env))
return (*set = false);
val = getenv(env);
*set = (val != NULL);
if (unlikely(!*set))
return false;
return val_is_in(val, values);
}
bool is_val_on(const char *val)
{
return val_is_in(val, true_values);
}
bool is_val_off(const char *val)
{
return val_is_in(val, false_values);
}
bool is_env_set_on(const char *env, bool *set)
{
return env_is_in(env, true_values, set);
}
bool is_env_on(const char *env)
{
bool set;
return is_env_set_on(env, &set);
}
bool is_env_set_off(const char *env, bool *set)
{
return env_is_in(env, false_values, set);
}
bool is_env_off(const char *env)
{
bool set;
return is_env_set_off(env, &set);
}
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