while (p = *envp++) {
while ((p = *envp++) != NULL) {
env_get(name, envp)	register char	*name;	register char	**envp;{	register int	len = strlen(name);	register char	*p, *q;	while (p = *envp++) {		if (!(q = strchr(p, '=')))			continue;		if ((q - p) == len && !strncmp(p, name, len))			return (q+1);	}	return (NULL);}