strerror.c

/* public domain rewrite of strerror(3) */

extern int sys_nerr;
extern char *sys_errlist[];

static char msg[50];

char *
strerror(error)
    int error;
{
    if (error <= sys_nerr && error > 0) {
	return sys_errlist[error];
    }
    sprintf(msg, "Unknown error (%d)", error);
    return msg;
}