include/platform/compat.h

   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 #ifndef _PLATFORM_COMPAT_H_
  25 #define _PLATFORM_COMPAT_H_
  26
  27 #include <platform/string.h>
  28
  29 __BEGIN_DECLS
  30
  31 /* Helpers for other common non-primitive routines */
  32
  33 __header_always_inline
  34 size_t
  35 _platform_strlen(const char *s) {
  36         const char *t = _platform_memchr(s, '\0', SIZE_MAX);
  37         return (uintptr_t)t - (uintptr_t)s;
  38 }
  39
  40 __header_always_inline
  41 size_t
  42 _platform_strlcpy(char * restrict dst, const char * restrict src, size_t maxlen) {
  43         const size_t srclen = _platform_strlen(src);
  44         if (srclen < maxlen) {
  45                 _platform_memmove(dst, src, srclen+1);
  46         } else if (maxlen != 0) {
  47                 _platform_memmove(dst, src, maxlen-1);
  48                 dst[maxlen-1] = '\0';
  49         }
  50         return srclen;
  51 }
  52
  53 __END_DECLS
  54
  55 /* Compat macros for primitives */
  56 #define bzero            _platform_bzero
  57 #define memchr           _platform_memchr
  58 #define memcmp           _platform_memcmp
  59 #define memmove          _platform_memmove
  60 #define memccpy          _platform_memccpy
  61 #define memset           _platform_memset
  62 #define memset_pattern4  _platform_memset_pattern4
  63 #define memset_pattern8  _platform_memset_pattern8
  64 #define memset_pattern16 _platform_memset_pattern16
  65 #define strchr           _platform_strchr
  66 #define strcmp           _platform_strcmp
  67 #define strncmp          _platform_strncmp
  68
  69 /* Compat macros for non-primitive helpers */
  70 #define strlcpy          _platform_strlcpy
  71 #define strlen           _platform_strlen
  72
  73 #endif /* _PLATFORM_COMPAT_H_ */