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/* indexbyte.c -- implement bytes.IndexByte for Go.
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 "runtime.h"
#include "array.h"
/* This is in C so that the compiler can optimize it appropriately.
We deliberately don't split the stack in case it does call the
library function, which shouldn't need much stack space. */
intgo IndexByte (struct __go_open_array, char)
__asm__ (GOSYM_PREFIX "bytes.IndexByte")
__attribute__ ((no_split_stack));
intgo
IndexByte (struct __go_open_array s, char b)
{
char *p;
p = __builtin_memchr (s.__values, b, s.__count);
if (p == NULL)
return -1;
return p - (char *) s.__values;
}
/* Comparison. */
_Bool Equal (struct __go_open_array a, struct __go_open_array b)
__asm__ (GOSYM_PREFIX "bytes.Equal")
__attribute__ ((no_split_stack));
_Bool
Equal (struct __go_open_array a, struct __go_open_array b)
{
if (a.__count != b.__count)
return 0;
return __builtin_memcmp (a.__values, b.__values, a.__count) == 0;
}
intgo Compare (struct __go_open_array a, struct __go_open_array b)
__asm__ (GOSYM_PREFIX "bytes.Compare")
__attribute__ ((no_split_stack));
intgo
Compare (struct __go_open_array a, struct __go_open_array b)
{
intgo len;
len = a.__count;
if (len > b.__count)
len = b.__count;
if (len > 0)
{
intgo ret;
ret = __builtin_memcmp (a.__values, b.__values, len);
if (ret < 0)
return -1;
else if (ret > 0)
return 1;
}
if (a.__count < b.__count)
return -1;
else if (a.__count > b.__count)
return 1;
else
return 0;
}
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