mirror of
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132 lines
2.0 KiB
Plaintext
132 lines
2.0 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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#include "arch.h"
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#include "malloc.h"
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#include "go-string.h"
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#include "race.h"
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#define charntorune(pv, str, len) __go_get_rune(str, len, pv)
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const String runtime_emptystring;
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intgo
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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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intgo
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runtime_findnullw(const uint16 *s)
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{
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intgo l;
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if(s == nil)
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return 0;
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for(l=0; s[l]!=0; l++)
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;
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return l;
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}
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static String
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gostringsize(intgo l, byte** pmem)
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{
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String s;
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byte *mem;
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if(l == 0) {
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*pmem = nil;
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return runtime_emptystring;
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}
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// leave room for NUL for C runtime (e.g., callers of getenv)
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mem = runtime_mallocgc(l+1, 0, FlagNoScan|FlagNoZero);
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s.str = mem;
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s.len = l;
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mem[l] = 0;
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*pmem = mem;
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return s;
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}
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String
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runtime_gostring(const byte *str)
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{
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intgo l;
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String s;
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byte *mem;
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l = runtime_findnull(str);
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s = gostringsize(l, &mem);
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runtime_memmove(mem, str, l);
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return 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.str = str;
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s.len = runtime_findnull(str);
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return s;
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}
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String runtime_cstringToGo(byte*)
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__asm__ (GOSYM_PREFIX "runtime.cstringToGo");
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String
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runtime_cstringToGo(byte *str)
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{
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return runtime_gostringnocopy(str);
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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 int) (retk int) {
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int32 l;
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if(k >= s.len) {
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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.str[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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retk = k + charntorune(&l, s.str+k, s.len-k);
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out:
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}
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func stringiter2(s String, k int) (retk int, retv int32) {
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if(k >= s.len) {
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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.str[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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retk = k + charntorune(&retv, s.str+k, s.len-k);
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out:
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}
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