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// 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"

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

int32

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.__data = (const unsigned char *) str;

        s.__length = runtime_findnull(str);

        return s;

}

enum

{

        Runeself        = 0x80,

};

func stringiter(s String, k int32) (retk int32) {

        int32 l, n;

        if(k >= s.__length) {

                // retk=0 is end of iteration

                retk = 0;

                goto out;

        }

        l = s.__data[k];

        if(l < Runeself) {

                retk = k+1;

                goto out;

        }

        // multi-char rune

        n = charntorune(&l, s.__data+k, s.__length-k);

        retk = k + (n ? n : 1);

out:

}

func stringiter2(s String, k int32) (retk int32, retv int32) {

        int32 n;

        if(k >= s.__length) {

                // retk=0 is end of iteration

                retk = 0;

                retv = 0;

                goto out;

        }

        retv = s.__data[k];

        if(retv < Runeself) {

                retk = k+1;

                goto out;

        }

        // multi-char rune

        n = charntorune(&retv, s.__data+k, s.__length-k);

        retk = k + (n ? n : 1);

out:

}