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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:
}