grub-core/gentrigtables.c

   1 /* Generate trigonometric function tables. */
   2 /*
   3  *  GRUB  --  GRand Unified Bootloader
   4  *  Copyright (C) 2008, 2009  Free Software Foundation, Inc.
   5  *
   6  *  GRUB is free software: you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation, either version 3 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  GRUB is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #define _GNU_SOURCE 1
  21
  22 #include <grub/trig.h>
  23 #include <math.h>
  24 #include <stdio.h>
  25
  26 int
  27 main (int argc __attribute__ ((unused)),
  28       char **argv __attribute__ ((unused)))
  29 {
  30   int i;
  31
  32   printf ("#include <grub/types.h>\n");
  33   printf ("#include <grub/dl.h>\n");
  34   printf ("\n");
  35
  36   printf ("/* Under copyright legislature such automated output isn't\n");
  37   printf ("covered by any copyright. Hence it's public domain. Public\n");
  38   printf ("domain works can be dual-licenced with any license. */\n");
  39   printf ("GRUB_MOD_LICENSE (\"GPLv3+\");");
  40   printf ("GRUB_MOD_DUAL_LICENSE (\"Public Domain\");");
  41
  42 #define TAB(op) \
  43   printf ("const grub_int16_t grub_trig_" #op "tab[] =\n{"); \
  44   for (i = 0; i < GRUB_TRIG_ANGLE_MAX; i++) \
  45     { \
  46       double x = i * 2 * M_PI / GRUB_TRIG_ANGLE_MAX; \
  47       if (i % 10 == 0) \
  48         printf ("\n    "); \
  49       printf ("%d,", (int) (round (op (x) * GRUB_TRIG_FRACTION_SCALE))); \
  50     } \
  51   printf ("\n};\n")
  52
  53   TAB(sin);
  54   TAB(cos);
  55
  56   return 0;
  57 }