release/src/router/lzo/tests/promote.c

   1 /* promote.c -- test intergral promotion
   2
   3    This file is part of the LZO real-time data compression library.
   4
   5    Copyright (C) 1996-2014 Markus Franz Xaver Johannes Oberhumer
   6    All Rights Reserved.
   7
   8    The LZO library is free software; you can redistribute it and/or
   9    modify it under the terms of the GNU General Public License as
  10    published by the Free Software Foundation; either version 2 of
  11    the License, or (at your option) any later version.
  12
  13    The LZO library is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with the LZO library; see the file COPYING.
  20    If not, write to the Free Software Foundation, Inc.,
  21    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  22
  23    Markus F.X.J. Oberhumer
  24    <markus@oberhumer.com>
  25    http://www.oberhumer.com/opensource/lzo/
  26  */
  27
  28 #include <stdio.h>
  29
  30 #if defined(_MSC_VER) && (_MSC_VER+0 >= 1000)
  31    /* disable "unreachable code" warnings */
  32 #  pragma warning(disable: 4702)
  33 #endif
  34
  35 int main(int argc, char *argv[])
  36 {
  37     unsigned char c;
  38     int s;
  39
  40     if (argc < 0 && argv == NULL)   /* avoid warning about unused args */
  41         return 0;
  42
  43     c = (unsigned char) (1 << (8 * sizeof(char) - 1));
  44     s = 8 * (int) (sizeof(int) - sizeof(char));
  45
  46     printf("Integral promotion: ");
  47     {
  48     const int u = (c << s) > 0;
  49     if (u)
  50     {
  51         printf("Classic C (unsigned-preserving)\n");
  52         printf("%d %d %uU\n", c, s, (unsigned)c << s);
  53         return 1;
  54     }
  55     else
  56     {
  57         printf("ANSI C (value-preserving)\n");
  58         printf("%d %d %d\n", c, s, c << s);
  59         return 0;
  60     }
  61     }
  62 }
  63
  64 /* vim:set ts=4 sw=4 et: */