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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:
}
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