74 lines
1.7 KiB
C
74 lines
1.7 KiB
C
/* indexbyte.c -- implement bytes.IndexByte for Go.
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Copyright 2009 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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#include <stddef.h>
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#include "runtime.h"
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#include "array.h"
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/* This is in C so that the compiler can optimize it appropriately.
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We deliberately don't split the stack in case it does call the
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library function, which shouldn't need much stack space. */
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intgo IndexByte (struct __go_open_array, char)
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__asm__ (GOSYM_PREFIX "bytes.IndexByte")
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__attribute__ ((no_split_stack));
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intgo
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IndexByte (struct __go_open_array s, char b)
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{
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char *p;
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p = __builtin_memchr (s.__values, b, s.__count);
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if (p == NULL)
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return -1;
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return p - (char *) s.__values;
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}
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/* Comparison. */
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_Bool Equal (struct __go_open_array a, struct __go_open_array b)
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__asm__ (GOSYM_PREFIX "bytes.Equal")
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__attribute__ ((no_split_stack));
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_Bool
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Equal (struct __go_open_array a, struct __go_open_array b)
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{
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if (a.__count != b.__count)
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return 0;
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return __builtin_memcmp (a.__values, b.__values, a.__count) == 0;
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}
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intgo Compare (struct __go_open_array a, struct __go_open_array b)
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__asm__ (GOSYM_PREFIX "bytes.Compare")
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__attribute__ ((no_split_stack));
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intgo
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Compare (struct __go_open_array a, struct __go_open_array b)
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{
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intgo len;
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len = a.__count;
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if (len > b.__count)
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len = b.__count;
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if (len > 0)
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{
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intgo ret;
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ret = __builtin_memcmp (a.__values, b.__values, len);
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if (ret < 0)
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return -1;
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else if (ret > 0)
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return 1;
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}
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if (a.__count < b.__count)
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return -1;
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else if (a.__count > b.__count)
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return 1;
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else
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return 0;
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}
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