lib/libc/gdtoa/test/getround.c

   1 /****************************************************************
   2
   3 The author of this software is David M. Gay.
   4
   5 Copyright (C) 1998 by Lucent Technologies
   6 All Rights Reserved
   7
   8 Permission to use, copy, modify, and distribute this software and
   9 its documentation for any purpose and without fee is hereby
  10 granted, provided that the above copyright notice appear in all
  11 copies and that both that the copyright notice and this
  12 permission notice and warranty disclaimer appear in supporting
  13 documentation, and that the name of Lucent or any of its entities
  14 not be used in advertising or publicity pertaining to
  15 distribution of the software without specific, written prior
  16 permission.
  17
  18 LUCENT DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
  19 INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS.
  20 IN NO EVENT SHALL LUCENT OR ANY OF ITS ENTITIES BE LIABLE FOR ANY
  21 SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  22 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER
  23 IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
  24 ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
  25 THIS SOFTWARE.
  26
  27 ****************************************************************/
  28
  29 /* Please send bug reports to David M. Gay (dmg at acm dot org,
  30  * with " at " changed at "@" and " dot " changed to ".").      */
  31
  32 #include <stdio.h>
  33 #include <stdlib.h>
  34
  35 static char *dir[4] = { "toward zero", "nearest", "toward +Infinity",
  36                         "toward -Infinity" };
  37
  38 #ifdef Honor_FLT_ROUNDS
  39 #include <fenv.h>
  40 static int fe_conv[4] = {FE_TOWARDZERO, FE_TONEAREST, FE_UPWARD, FE_DOWNWARD };
  41 #endif
  42
  43  int
  44 #ifdef KR_headers
  45 getround(r, s) int r; char *s;
  46 #else
  47 getround(int r, char *s)
  48 #endif
  49 {
  50         int i;
  51
  52         while(*++s <= ' ') {
  53                 if (!*s) {
  54                         printf("Current round mode for strtor... is %d (%s).\n",
  55                                 r, dir[r]);
  56                         return r;
  57                         }
  58                 }
  59         i = atoi(s);
  60         if (i >= 0 && i < 4) {
  61                 printf("Rounding mode for strtor... ");
  62                 if (i == r)
  63                         printf("was and is %d (%s)\n", i, dir[i]);
  64                 else
  65                         printf("changed from %d (%s) to %d (%s)\n",
  66                                 r, dir[r], i, dir[i]);
  67 #ifdef Honor_FLT_ROUNDS
  68                 fesetround(fe_conv[i]);
  69 #endif
  70                 return i;
  71                 }
  72         printf("Bad rounding direction %d: choose among\n", i);
  73         for(i = 0; i < 4; i++)
  74                 printf("\t%d (%s)\n", i, dir[i]);
  75         printf("Leaving rounding mode for strtor... at %d (%s)\n", r, dir[r]);
  76         return r;
  77         }
  78
  79 #ifdef USE_MY_LOCALE
  80 #include <locale.h>
  81
  82  struct lconv *
  83 localeconv(void)
  84 {
  85         static struct lconv mylocale;
  86         mylocale.decimal_point = "<Pt>";
  87         return &mylocale;
  88         }
  89 #endif
  90