30 lines
778 B
C
30 lines
778 B
C
/* indexbyte.c -- implement strings.IndexByte for Go.
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Copyright 2013 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 "go-string.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 (String, char)
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__asm__ (GOSYM_PREFIX "strings.IndexByte")
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__attribute__ ((no_split_stack));
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intgo
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IndexByte (String s, char b)
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{
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const char *p;
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p = __builtin_memchr ((const char *) s.str, b, s.len);
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if (p == NULL)
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return -1;
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return p - (const char *) s.str;
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}
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