// Copyright 2009, 2010 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package runtime
#include "runtime.h"
#include "arch.h"
#include "malloc.h"
#include "go-string.h"

#define charntorune(pv, str, len) __go_get_rune(str, len, pv)

intgo
runtime_findnull(const byte *s)
{
	if(s == nil)
		return 0;
	return __builtin_strlen((const char*) s);
}

String
runtime_gostringnocopy(const byte *str)
{
	String s;
	
	s.str = str;
	s.len = runtime_findnull(str);
	return s;
}

enum
{
	Runeself	= 0x80,
};

func stringiter(s String, k int) (retk int) {
	int32 l;

	if(k >= s.len) {
		// retk=0 is end of iteration
		retk = 0;
		goto out;
	}

	l = s.str[k];
	if(l < Runeself) {
		retk = k+1;
		goto out;
	}

	// multi-char rune
	retk = k + charntorune(&l, s.str+k, s.len-k);

out:
}

func stringiter2(s String, k int) (retk int, retv int) {
	if(k >= s.len) {
		// retk=0 is end of iteration
		retk = 0;
		retv = 0;
		goto out;
	}

	retv = s.str[k];
	if(retv < Runeself) {
		retk = k+1;
		goto out;
	}

	// multi-char rune
	retk = k + charntorune(&retv, s.str+k, s.len-k);

out:
}