76 lines
1.2 KiB
Plaintext
76 lines
1.2 KiB
Plaintext
// Copyright 2009, 2010 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package runtime
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#include "runtime.h"
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#define charntorune(pv, str, len) __go_get_rune(str, len, pv)
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int32
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runtime_findnull(const byte *s)
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{
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if(s == nil)
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return 0;
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return __builtin_strlen((const char*) s);
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}
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String
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runtime_gostringnocopy(const byte *str)
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{
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String s;
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s.__data = (const unsigned char *) str;
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s.__length = runtime_findnull(str);
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return s;
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}
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enum
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{
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Runeself = 0x80,
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};
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func stringiter(s String, k int32) (retk int32) {
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int32 l, n;
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if(k >= s.__length) {
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// retk=0 is end of iteration
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retk = 0;
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goto out;
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}
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l = s.__data[k];
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if(l < Runeself) {
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retk = k+1;
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goto out;
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}
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// multi-char rune
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n = charntorune(&l, s.__data+k, s.__length-k);
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retk = k + (n ? n : 1);
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out:
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}
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func stringiter2(s String, k int32) (retk int32, retv int32) {
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int32 n;
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if(k >= s.__length) {
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// retk=0 is end of iteration
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retk = 0;
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retv = 0;
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goto out;
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}
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retv = s.__data[k];
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if(retv < Runeself) {
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retk = k+1;
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goto out;
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}
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// multi-char rune
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n = charntorune(&retv, s.__data+k, s.__length-k);
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retk = k + (n ? n : 1);
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out:
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}
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