libgo/runtime/go-type-string.c

   1 /* go-type-string.c -- hash and equality string functions.
   2
   3    Copyright 2009 The Go Authors. All rights reserved.
   4    Use of this source code is governed by a BSD-style
   5    license that can be found in the LICENSE file.  */
   6
   7 #include "runtime.h"
   8 #include "go-type.h"
   9 #include "go-string.h"
  10
  11 /* A string hash function for a map.  */
  12
  13 uintptr_t
  14 __go_type_hash_string (const void *vkey,
  15                        uintptr_t key_size __attribute__ ((unused)))
  16 {
  17   uintptr_t ret;
  18   const String *key;
  19   intgo len;
  20   intgo i;
  21   const byte *p;
  22
  23   ret = 5381;
  24   key = (const String *) vkey;
  25   len = key->len;
  26   for (i = 0, p = key->str; i < len; i++, p++)
  27     ret = ret * 33 + *p;
  28   return ret;
  29 }
  30
  31 /* A string equality function for a map.  */
  32
  33 _Bool
  34 __go_type_equal_string (const void *vk1, const void *vk2,
  35                         uintptr_t key_size __attribute__ ((unused)))
  36 {
  37   const String *k1;
  38   const String *k2;
  39
  40   k1 = (const String *) vk1;
  41   k2 = (const String *) vk2;
  42   return __go_ptr_strings_equal (k1, k2);
  43 }