libgo/go/bytes/indexbyte.c

   1 /* indexbyte.c -- implement bytes.IndexByte for Go.
   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 <stddef.h>
   8
   9 #include "array.h"
  10
  11 /* This is in C so that the compiler can optimize it
  12    appropriately.  */
  13
  14 int IndexByte (struct __go_open_array, char)
  15   asm ("libgo_bytes.bytes.IndexByte");
  16
  17 int
  18 IndexByte (struct __go_open_array s, char b)
  19 {
  20   char *p;
  21
  22   p = __builtin_memchr (s.__values, b, s.__count);
  23   if (p == NULL)
  24     return -1;
  25   return p - (char *) s.__values;
  26 }