#include <string.h>
#include <errno.h>

static char *errno_strings [] = {
	[0]        = "Success",
	[EDOM]     = "Numerical argument out of domain",
	[EILSEQ]   = "Invalid or incomplete multibyte or wide character",
	[ERANGE]   = "Numerical result out of range",
};

char *strerror(int e)
{
	int count = sizeof errno_strings / sizeof errno_strings[0];
	return (e >= 0 && e < count) ? errno_strings[e] : "<Unknown errno>";
}