contrib/gdtoa/test/ddtest.c

   1 /****************************************************************
   2
   3 The author of this software is David M. Gay.
   4
   5 Copyright (C) 1998-2001 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 /* Test program for g_ddfmt, strtoIdd, strtopdd, and strtordd.
  33  *
  34  * Inputs (on stdin):
  35  *              r rounding_mode
  36  *              n ndig
  37  *              number
  38  *              #hex0 hex1 hex2 hex3
  39  *
  40  *      rounding_mode values:
  41  *              0 = toward zero
  42  *              1 = nearest
  43  *              2 = toward +Infinity
  44  *              3 = toward -Infinity
  45  *
  46  * where number is a decimal floating-point number,
  47  * hex0 is a string of <= 8 Hex digits for the most significant
  48  * word of the number, hex1 is a similar string for the next
  49  * word, etc., and ndig is a parameters to g_ddfmt.
  50  */
  51
  52 #include "gdtoaimp.h"
  53 #include <stdio.h>
  54 #include <stdlib.h>
  55
  56  extern int getround ANSI((int,char*));
  57
  58  static char ibuf[2048], obuf[1024];
  59
  60 #define U (unsigned long)
  61
  62  static void
  63 #ifdef KR_headers
  64 dprint(what, d) char *what; double d;
  65 #else
  66 dprint(char *what, double d)
  67 #endif
  68 {
  69         char buf[32];
  70         union { double d; ULong L[2]; } u;
  71
  72         u.d = d;
  73         g_dfmt(buf,&d,0,sizeof(buf));
  74         printf("%s = %s = #%lx %lx\n", what, buf, U u.L[_0], U u.L[_1]);
  75         }
  76
  77  int
  78 main(Void)
  79 {
  80         char *s, *s1, *se, *se1;
  81         int dItry, i, j, r = 1, ndig = 0;
  82         double ddI[4];
  83         long LL[4];
  84         union { double dd[2]; ULong L[4]; } u;
  85
  86         while( (s = fgets(ibuf, sizeof(ibuf), stdin)) !=0) {
  87                 while(*s <= ' ')
  88                         if (!*s++)
  89                                 continue;
  90                 dItry = 0;
  91                 switch(*s) {
  92                   case 'r':
  93                         r = getround(r, s);
  94                         continue;
  95                   case 'n':
  96                         i = s[1];
  97                         if (i <= ' ' || i >= '0' && i <= '9') {
  98                                 ndig = atoi(s+1);
  99                                 continue;
 100                                 }
 101                         break; /* nan? */
 102                   case '#':
 103                         LL[0] = u.L[_0];
 104                         LL[1] = u.L[_1];
 105                         LL[2] = u.L[2+_0];
 106                         LL[3] = u.L[2+_1];
 107                         sscanf(s+1, "%lx %lx %lx %lx", &LL[0], &LL[1],
 108                                 &LL[2], &LL[3]);
 109                         u.L[_0] = LL[0];
 110                         u.L[_1] = LL[1];
 111                         u.L[2+_0] = LL[2];
 112                         u.L[2+_1] = LL[3];
 113                         printf("\nInput: %s", ibuf);
 114                         printf(" --> f = #%lx %lx %lx %lx\n",
 115                                 LL[0],LL[1],LL[2],LL[3]);
 116                         goto fmt_test;
 117                         }
 118                 printf("\nInput: %s", ibuf);
 119                 for(s1 = s; *s1 > ' '; s1++){};
 120                 while(*s1 <= ' ' && *s1) s1++;
 121                 if (!*s1) {
 122                         dItry = 1;
 123                         i = strtordd(ibuf, &se, r, u.dd);
 124                         if (r == 1) {
 125                                 j = strtopdd(ibuf, &se1, ddI);
 126                                 if (i != j || u.dd[0] != ddI[0]
 127                                  || u.dd[1] != ddI[1] || se != se1)
 128                                         printf("***strtopdd and strtordd disagree!!\n:");
 129                                 }
 130                         printf("strtopdd consumes %d bytes and returns %d\n",
 131                                 (int)(se-ibuf), i);
 132                         }
 133                 else {
 134                         u.dd[0] = strtod(s, &se);
 135                         u.dd[1] = strtod(se, &se);
 136                         }
 137  fmt_test:
 138                 dprint("dd[0]", u.dd[0]);
 139                 dprint("dd[1]", u.dd[1]);
 140                 se = g_ddfmt(obuf, u.dd, ndig, sizeof(obuf));
 141                 printf("g_ddfmt(%d) gives %d bytes: \"%s\"\n\n",
 142                         ndig, (int)(se-obuf), se ? obuf : "<null>");
 143                 if (!dItry)
 144                         continue;
 145                 printf("strtoIdd returns %d,", strtoIdd(ibuf, &se, ddI,&ddI[2]));
 146                 printf(" consuming %d bytes.\n", (int)(se-ibuf));
 147                 if (ddI[0] == ddI[2] && ddI[1] == ddI[3]) {
 148                         if (ddI[0] == u.dd[0] && ddI[1] == u.dd[1])
 149                                 printf("ddI[0] == ddI[1] == strtopdd\n");
 150                         else
 151                                 printf("ddI[0] == ddI[1] = #%lx %lx + %lx %lx\n= %.17g + %17.g\n",
 152                                         U ((ULong*)ddI)[_0],
 153                                         U ((ULong*)ddI)[_1],
 154                                         U ((ULong*)ddI)[2+_0],
 155                                         U ((ULong*)ddI)[2+_1],
 156                                         ddI[0], ddI[1]);
 157                         }
 158                 else {
 159                         printf("ddI[0] = #%lx %lx + %lx %lx\n= %.17g + %.17g\n",
 160                                 U ((ULong*)ddI)[_0], U ((ULong*)ddI)[_1],
 161                                 U ((ULong*)ddI)[2+_0], U ((ULong*)ddI)[2+_1],
 162                                 ddI[0], ddI[1]);
 163                         printf("ddI[1] = #%lx %lx + %lx %lx\n= %.17g + %.17g\n",
 164                                 U ((ULong*)ddI)[4+_0], U ((ULong*)ddI)[4+_1],
 165                                 U ((ULong*)ddI)[6+_0], U ((ULong*)ddI)[6+_1],
 166                                 ddI[2], ddI[3]);
 167                         if (ddI[0] == u.dd[0] && ddI[1] == u.dd[1])
 168                                 printf("ddI[0] == strtod\n");
 169                         else if (ddI[2] == u.dd[0] && ddI[3] == u.dd[1])
 170                                 printf("ddI[1] == strtod\n");
 171                         else
 172                                 printf("**** Both differ from strtopdd ****\n");
 173                         }
 174                 printf("\n");
 175                 }
 176         return 0;
 177         }