find_right_paren
if ( (next = find_right_paren( str )) == NULL )
static char *find_right_paren( char *s );
if ( (next = find_right_paren( str + 1 )) == NULL )
if ((next = find_right_paren(str)) == NULL)
np = find_right_paren(str+1);
if ((next = find_right_paren(str + 1)) == NULL)