misc/tst-efgcvt.c

   1 /* Copyright (C) 1998-2013 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, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 #ifndef _GNU_SOURCE
  19 # define _GNU_SOURCE    1
  20 #endif
  21
  22 #include <float.h>
  23 #include <math.h>
  24 #include <stdio.h>
  25 #include <stdlib.h>
  26 #include <string.h>
  27
  28 int error_count;
  29
  30 typedef struct
  31 {
  32   double value;
  33   int ndigit;
  34   int decpt;
  35   char result[30];
  36 } testcase;
  37
  38 typedef char * ((*efcvt_func) (double, int, int *, int *));
  39
  40 typedef int ((*efcvt_r_func) (double, int, int *, int *, char *, size_t));
  41
  42
  43 static testcase ecvt_tests[] =
  44 {
  45   { 0.0, 0, 1, "" },
  46   { 10.0, 0, 2, "" },
  47   { 10.0, 1, 2, "1" },
  48   { 10.0, 5, 2, "10000" },
  49   { -12.0, 5, 2, "12000" },
  50   { 0.2, 4, 0, "2000" },
  51   { 0.02, 4, -1, "2000" },
  52   { 5.5, 1, 1, "6" },
  53   { 1.0, -1, 1, "" },
  54   { 0.01, 2, -1, "10" },
  55   { 100.0, -2, 3, "" },
  56   { 100.0, -5, 3, "" },
  57   { 100.0, -4, 3, "" },
  58   { 100.01, -4, 3, "" },
  59   { 123.01, -4, 3, "" },
  60   { 126.71, -4, 3, "" },
  61   { 0.0, 4, 1, "0000" },
  62 #if DBL_MANT_DIG == 53
  63   { 0x1p-1074, 3, -323, "494" },
  64   { -0x1p-1074, 3, -323, "494" },
  65 #endif
  66   /* -1.0 is end marker.  */
  67   { -1.0, 0, 0, "" }
  68 };
  69
  70 static testcase fcvt_tests[] =
  71 {
  72   { 0.0, 0, 1, "0" },
  73   { 10.0, 0, 2, "10" },
  74   { 10.0, 1, 2, "100" },
  75   { 10.0, 4, 2, "100000" },
  76   { -12.0, 5, 2, "1200000" },
  77   { 0.2, 4, 0, "2000" },
  78   { 0.02, 4, -1, "200" },
  79   { 5.5, 1, 1, "55" },
  80   { 5.5, 0, 1, "6" },
  81   { 0.01, 2, -1, "1" },
  82   { 100.0, -2, 3, "100" },
  83   { 100.0, -5, 3, "100" },
  84   { 100.0, -4, 3, "100" },
  85   { 100.01, -4, 3, "100" },
  86   { 123.01, -4, 3, "100" },
  87   { 126.71, -4, 3, "100" },
  88   { 322.5, 16, 3, "3225000000000000000" },
  89   /* -1.0 is end marker.  */
  90   { -1.0, 0, 0, "" }
  91 };
  92
  93 static void
  94 output_error (const char *name, double value, int ndigit,
  95               const char *exp_p, int exp_decpt, int exp_sign,
  96               char *res_p, int res_decpt, int res_sign)
  97 {
  98   printf ("%s returned wrong result for value: %f, ndigits: %d\n",
  99           name, value, ndigit);
 100   printf ("Result was p: \"%s\", decpt: %d, sign: %d\n",
 101           res_p, res_decpt, res_sign);
 102   printf ("Should be  p: \"%s\", decpt: %d, sign: %d\n",
 103           exp_p, exp_decpt, exp_sign);
 104   ++error_count;
 105 }
 106
 107
 108 static void
 109 output_r_error (const char *name, double value, int ndigit,
 110                 const char *exp_p, int exp_decpt, int exp_sign, int exp_return,
 111                 char *res_p, int res_decpt, int res_sign, int res_return)
 112 {
 113   printf ("%s returned wrong result for value: %f, ndigits: %d\n",
 114           name, value, ndigit);
 115   printf ("Result was buf: \"%s\", decpt: %d, sign: %d return value: %d\n",
 116           res_p, res_decpt, res_sign, res_return);
 117   printf ("Should be  buf: \"%s\", decpt: %d, sign: %d\n",
 118           exp_p, exp_decpt, exp_sign);
 119   ++error_count;
 120 }
 121
 122 static void
 123 test (testcase tests[], efcvt_func efcvt, const char *name)
 124 {
 125   int no = 0;
 126   int decpt, sign;
 127   char *p;
 128
 129   while (tests[no].value != -1.0)
 130     {
 131       p = efcvt (tests[no].value, tests[no].ndigit, &decpt, &sign);
 132       if (decpt != tests[no].decpt
 133           || sign != (tests[no].value < 0)
 134           || strcmp (p, tests[no].result) != 0)
 135         output_error (name, tests[no].value, tests[no].ndigit,
 136                       tests[no].result, tests[no].decpt,
 137                       (tests[no].value < 0),
 138                       p, decpt, sign);
 139       ++no;
 140     }
 141 }
 142
 143 static void
 144 test_r (testcase tests[], efcvt_r_func efcvt_r, const char *name)
 145 {
 146   int no = 0;
 147   int decpt, sign, res;
 148   char buf [1024];
 149
 150
 151   while (tests[no].value != -1.0)
 152     {
 153       res = efcvt_r (tests[no].value, tests[no].ndigit, &decpt, &sign,
 154                      buf, sizeof (buf));
 155       if (res != 0
 156           || decpt != tests[no].decpt
 157           || sign != (tests[no].value < 0)
 158           || strcmp (buf, tests[no].result) != 0)
 159         output_r_error (name, tests[no].value, tests[no].ndigit,
 160                         tests[no].result, tests[no].decpt, 0,
 161                         (tests[no].value < 0),
 162                         buf, decpt, sign, res);
 163       ++no;
 164     }
 165 }
 166
 167 static void
 168 special (void)
 169 {
 170   int decpt, sign, res;
 171   char *p;
 172   char buf [1024];
 173
 174   p = ecvt (NAN, 10, &decpt, &sign);
 175   if (sign != 0 || strcmp (p, "nan") != 0)
 176     output_error ("ecvt", NAN, 10, "nan", 0, 0, p, decpt, sign);
 177
 178   p = ecvt (INFINITY, 10, &decpt, &sign);
 179   if (sign != 0 || strcmp (p, "inf") != 0)
 180     output_error ("ecvt", INFINITY, 10, "inf", 0, 0, p, decpt, sign);
 181
 182   /* Simply make sure these calls with large NDIGITs don't crash.  */
 183   (void) ecvt (123.456, 10000, &decpt, &sign);
 184   (void) fcvt (123.456, 10000, &decpt, &sign);
 185
 186   /* Some tests for the reentrant functions.  */
 187   /* Use a too small buffer.  */
 188   res = ecvt_r (123.456, 10, &decpt, &sign, buf, 1);
 189   if (res == 0)
 190     {
 191       printf ("ecvt_r with a too small buffer was succesful.\n");
 192       ++error_count;
 193     }
 194   res = fcvt_r (123.456, 10, &decpt, &sign, buf, 1);
 195   if (res == 0)
 196     {
 197       printf ("fcvt_r with a too small buffer was succesful.\n");
 198       ++error_count;
 199     }
 200 }
 201
 202
 203 int
 204 main (void)
 205 {
 206   test (ecvt_tests, ecvt, "ecvt");
 207   test (fcvt_tests, fcvt, "fcvt");
 208   test_r (ecvt_tests, ecvt_r, "ecvt_r");
 209   test_r (fcvt_tests, fcvt_r, "fcvt_r");
 210   special ();
 211
 212   return error_count;
 213 }