misc/tst-efgcvt.c

   1 /* Copyright (C) 1998, 1999, 2000, 2004, 2011 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.  */
  18
  19 #ifndef _GNU_SOURCE
  20 # define _GNU_SOURCE    1
  21 #endif
  22
  23 #include <float.h>
  24 #include <math.h>
  25 #include <stdio.h>
  26 #include <stdlib.h>
  27 #include <string.h>
  28
  29 int error_count;
  30
  31 typedef struct
  32 {
  33   double value;
  34   int ndigit;
  35   int decpt;
  36   char result[30];
  37 } testcase;
  38
  39 typedef char * ((*efcvt_func) (double, int, int *, int *));
  40
  41 typedef int ((*efcvt_r_func) (double, int, int *, int *, char *, size_t));
  42
  43
  44 static testcase ecvt_tests[] =
  45 {
  46   { 0.0, 0, 1, "" },
  47   { 10.0, 0, 2, "" },
  48   { 10.0, 1, 2, "1" },
  49   { 10.0, 5, 2, "10000" },
  50   { -12.0, 5, 2, "12000" },
  51   { 0.2, 4, 0, "2000" },
  52   { 0.02, 4, -1, "2000" },
  53   { 5.5, 1, 1, "6" },
  54   { 1.0, -1, 1, "" },
  55   { 0.01, 2, -1, "10" },
  56   { 100.0, -2, 3, "" },
  57   { 100.0, -5, 3, "" },
  58   { 100.0, -4, 3, "" },
  59   { 100.01, -4, 3, "" },
  60   { 123.01, -4, 3, "" },
  61   { 126.71, -4, 3, "" },
  62   { 0.0, 4, 1, "0000" },
  63 #if DBL_MANT_DIG == 53
  64   { 0x1p-1074, 3, -323, "494" },
  65   { -0x1p-1074, 3, -323, "494" },
  66 #endif
  67   /* -1.0 is end marker.  */
  68   { -1.0, 0, 0, "" }
  69 };
  70
  71 static testcase fcvt_tests[] =
  72 {
  73   { 0.0, 0, 1, "0" },
  74   { 10.0, 0, 2, "10" },
  75   { 10.0, 1, 2, "100" },
  76   { 10.0, 4, 2, "100000" },
  77   { -12.0, 5, 2, "1200000" },
  78   { 0.2, 4, 0, "2000" },
  79   { 0.02, 4, -1, "200" },
  80   { 5.5, 1, 1, "55" },
  81   { 5.5, 0, 1, "6" },
  82   { 0.01, 2, -1, "1" },
  83   { 100.0, -2, 3, "100" },
  84   { 100.0, -5, 3, "100" },
  85   { 100.0, -4, 3, "100" },
  86   { 100.01, -4, 3, "100" },
  87   { 123.01, -4, 3, "100" },
  88   { 126.71, -4, 3, "100" },
  89   { 322.5, 16, 3, "3225000000000000000" },
  90   /* -1.0 is end marker.  */
  91   { -1.0, 0, 0, "" }
  92 };
  93
  94 static void
  95 output_error (const char *name, double value, int ndigit,
  96               const char *exp_p, int exp_decpt, int exp_sign,
  97               char *res_p, int res_decpt, int res_sign)
  98 {
  99   printf ("%s returned wrong result for value: %f, ndigits: %d\n",
 100           name, value, ndigit);
 101   printf ("Result was p: \"%s\", decpt: %d, sign: %d\n",
 102           res_p, res_decpt, res_sign);
 103   printf ("Should be  p: \"%s\", decpt: %d, sign: %d\n",
 104           exp_p, exp_decpt, exp_sign);
 105   ++error_count;
 106 }
 107
 108
 109 static void
 110 output_r_error (const char *name, double value, int ndigit,
 111                 const char *exp_p, int exp_decpt, int exp_sign, int exp_return,
 112                 char *res_p, int res_decpt, int res_sign, int res_return)
 113 {
 114   printf ("%s returned wrong result for value: %f, ndigits: %d\n",
 115           name, value, ndigit);
 116   printf ("Result was buf: \"%s\", decpt: %d, sign: %d return value: %d\n",
 117           res_p, res_decpt, res_sign, res_return);
 118   printf ("Should be  buf: \"%s\", decpt: %d, sign: %d\n",
 119           exp_p, exp_decpt, exp_sign);
 120   ++error_count;
 121 }
 122
 123 static void
 124 test (testcase tests[], efcvt_func efcvt, const char *name)
 125 {
 126   int no = 0;
 127   int decpt, sign;
 128   char *p;
 129
 130   while (tests[no].value != -1.0)
 131     {
 132       p = efcvt (tests[no].value, tests[no].ndigit, &decpt, &sign);
 133       if (decpt != tests[no].decpt
 134           || sign != (tests[no].value < 0)
 135           || strcmp (p, tests[no].result) != 0)
 136         output_error (name, tests[no].value, tests[no].ndigit,
 137                       tests[no].result, tests[no].decpt,
 138                       (tests[no].value < 0),
 139                       p, decpt, sign);
 140       ++no;
 141     }
 142 }
 143
 144 static void
 145 test_r (testcase tests[], efcvt_r_func efcvt_r, const char *name)
 146 {
 147   int no = 0;
 148   int decpt, sign, res;
 149   char buf [1024];
 150
 151
 152   while (tests[no].value != -1.0)
 153     {
 154       res = efcvt_r (tests[no].value, tests[no].ndigit, &decpt, &sign,
 155                      buf, sizeof (buf));
 156       if (res != 0
 157           || decpt != tests[no].decpt
 158           || sign != (tests[no].value < 0)
 159           || strcmp (buf, tests[no].result) != 0)
 160         output_r_error (name, tests[no].value, tests[no].ndigit,
 161                         tests[no].result, tests[no].decpt, 0,
 162                         (tests[no].value < 0),
 163                         buf, decpt, sign, res);
 164       ++no;
 165     }
 166 }
 167
 168 static void
 169 special (void)
 170 {
 171   int decpt, sign, res;
 172   char *p;
 173   char buf [1024];
 174
 175   p = ecvt (NAN, 10, &decpt, &sign);
 176   if (sign != 0 || strcmp (p, "nan") != 0)
 177     output_error ("ecvt", NAN, 10, "nan", 0, 0, p, decpt, sign);
 178
 179   p = ecvt (INFINITY, 10, &decpt, &sign);
 180   if (sign != 0 || strcmp (p, "inf") != 0)
 181     output_error ("ecvt", NAN, 10, "inf", 0, 0, p, decpt, sign);
 182
 183   /* Simply make sure these calls with large NDIGITs don't crash.  */
 184   (void) ecvt (123.456, 10000, &decpt, &sign);
 185   (void) fcvt (123.456, 10000, &decpt, &sign);
 186
 187   /* Some tests for the reentrant functions.  */
 188   /* Use a too small buffer.  */
 189   res = ecvt_r (123.456, 10, &decpt, &sign, buf, 1);
 190   if (res == 0)
 191     {
 192       printf ("ecvt_r with a too small buffer was succesful.\n");
 193       ++error_count;
 194     }
 195   res = fcvt_r (123.456, 10, &decpt, &sign, buf, 1);
 196   if (res == 0)
 197     {
 198       printf ("fcvt_r with a too small buffer was succesful.\n");
 199       ++error_count;
 200     }
 201 }
 202
 203
 204 int
 205 main (void)
 206 {
 207   test (ecvt_tests, ecvt, "ecvt");
 208   test (fcvt_tests, fcvt, "fcvt");
 209   test_r (ecvt_tests, ecvt_r, "ecvt_r");
 210   test_r (fcvt_tests, fcvt_r, "fcvt_r");
 211   special ();
 212
 213   return error_count;
 214 }