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#include <stdlib.h>
#include <string.h>
#include "_stdlib.h"
#include "_readonly.h"
/** get an environment variable **/
char * getenv(const char * name)
{
size_t len = 0;
size_t i = 0;
static char *variable = NULL;
SIGNAL_SAFE(0);
if (variable == NULL) {
variable = __readonly(RO_ALLOC, "getenv");
}
len = strlen(name);
for (i = 0; __stdlib.environ[i] != NULL; i++) {
if (!strncmp(__stdlib.environ[i], name, len) && __stdlib.environ[i][len] == '=') {
__readonly(RO_UNLOCK, variable);
strcpy(variable, __stdlib.environ[i] + len + 1);
__readonly(RO_LOCK, variable);
return variable;
}
}
return NULL;
}
/***
read the environment variable ARGUMENT(name) from the host environment.
***/
/*
UNDEFINED(Modifying the returned string)
IMPLEMENTATION(The set of environment variable names)
IMPLEMENTATION(The method of altering the environment)
RETURN_FAILURE(CONSTANT(NULL))
RETURN_SUCCESS(a pointer to the environment string)
STDC(1)
*/
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