libgo/runtime/string.goc

   1 // Copyright 2009, 2010 The Go Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style
   3 // license that can be found in the LICENSE file.
   4
   5 package runtime
   6 #include "runtime.h"
   7 #define charntorune(pv, str, len) __go_get_rune(str, len, pv)
   8
   9 enum
  10 {
  11         Runeself        = 0x80,
  12 };
  13
  14 func stringiter(s String, k int32) (retk int32) {
  15         int32 l, n;
  16
  17         if(k >= s.__length) {
  18                 // retk=0 is end of iteration
  19                 retk = 0;
  20                 goto out;
  21         }
  22
  23         l = s.__data[k];
  24         if(l < Runeself) {
  25                 retk = k+1;
  26                 goto out;
  27         }
  28
  29         // multi-char rune
  30         n = charntorune(&l, s.__data+k, s.__length-k);
  31         retk = k + (n ? n : 1);
  32
  33 out:
  34 }
  35
  36 func stringiter2(s String, k int32) (retk int32, retv int32) {
  37         int32 n;
  38
  39         if(k >= s.__length) {
  40                 // retk=0 is end of iteration
  41                 retk = 0;
  42                 retv = 0;
  43                 goto out;
  44         }
  45
  46         retv = s.__data[k];
  47         if(retv < Runeself) {
  48                 retk = k+1;
  49                 goto out;
  50         }
  51
  52         // multi-char rune
  53         n = charntorune(&retv, s.__data+k, s.__length-k);
  54         retk = k + (n ? n : 1);
  55
  56 out:
  57 }