46 lines
1.1 KiB
C
46 lines
1.1 KiB
C
|
/* go-type-string.c -- hash and equality string functions.
|
||
|
|
|
||
|
|
Copyright 2009 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. */
|
||
|
|
|
||
|
|
#include <stddef.h>
|
||
|
|
|
||
|
|
#include "go-string.h"
|
||
|
|
#include "go-type.h"
|
||
|
|
|
||
|
|
/* A string hash function for a map. */
|
||
|
|
|
||
|
|
size_t
|
||
|
|
__go_type_hash_string (const void *vkey,
|
||
|
|
size_t key_size __attribute__ ((unused)))
|
||
|
|
{
|
||
|
|
size_t ret;
|
||
|
|
const struct __go_string *key;
|
||
|
|
size_t len;
|
||
|
|
size_t i;
|
||
|
|
const unsigned char *p;
|
||
|
|
|
||
|
|
ret = 5381;
|
||
|
|
key = (const struct __go_string *) vkey;
|
||
|
|
len = key->__length;
|
||
|
|
for (i = 0, p = key->__data; i < len; i++, p++)
|
||
|
|
ret = ret * 33 + *p;
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* A string equality function for a map. */
|
||
|
|
|
||
|
|
_Bool
|
||
|
|
__go_type_equal_string (const void *vk1, const void *vk2,
|
||
|
|
size_t key_size __attribute__ ((unused)))
|
||
|
|
{
|
||
|
|
const struct __go_string *k1;
|
||
|
|
const struct __go_string *k2;
|
||
|
|
|
||
|
|
k1 = (const struct __go_string *) vk1;
|
||
|
|
k2 = (const struct __go_string *) vk2;
|
||
|
|
return (k1->__length == k2->__length
|
||
|
|
&& __builtin_memcmp (k1->__data, k2->__data, k1->__length) == 0);
|
||
|
|
}
|