src/string/generic/memccpy.c

   1 /*
   2  * Copyright (c) 2013 Apple Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23
  24 #include <platform/string.h>
  25
  26 #if !_PLATFORM_OPTIMIZED_MEMCCPY
  27
  28 #include <stdlib.h>
  29
  30 void *
  31 _platform_memccpy(void *t, const void *f, int c, size_t n)
  32 {
  33         void *last;
  34
  35         if (n == 0) {
  36                 return NULL;
  37         }
  38
  39         last = _platform_memchr(f, c, n);
  40
  41         if (last == NULL) {
  42                 _platform_memmove(t, f, n);
  43                 return NULL;
  44         } else {
  45                 n = (char *)last - (char *)f + 1;
  46                 _platform_memmove(t, f, n);
  47                 return (void *)((char *)t + n);
  48         }
  49 }
  50
  51 #if VARIANT_STATIC
  52 void *
  53 memccpy(void *t, const void *f, int c, size_t n)
  54 {
  55         return _platform_memccpy(t, f, c, n);
  56 }
  57 #endif
  58
  59 #endif