libstdc++-v3/testsuite/20_util/to_chars/2.cc

   1 // Copyright (C) 2017-2022 Free Software Foundation, Inc.
   2 //
   3 // This file is part of the GNU ISO C++ Library.  This library is free
   4 // software; you can redistribute it and/or modify it under the
   5 // terms of the GNU General Public License as published by the
   6 // Free Software Foundation; either version 3, or (at your option)
   7 // any later version.
   8
   9 // This 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
  12 // GNU General Public License for more details.
  13
  14 // You should have received a copy of the GNU General Public License along
  15 // with this library; see the file COPYING3.  If not see
  16 // <http://www.gnu.org/licenses/>.
  17
  18 // <charconv> is supported in C++14 as a GNU extension
  19 // { dg-do run { target c++14 } }
  20
  21 #include <charconv>
  22 #include <testsuite_hooks.h>
  23
  24 // Test std::to_chars error handling.
  25
  26 void
  27 test01()
  28 {
  29   char buf[9] = "********";
  30   std::to_chars_result r;
  31
  32   r = std::to_chars(buf, buf, 1);
  33   VERIFY( r.ec == std::errc::value_too_large );
  34   VERIFY( r.ptr == buf );
  35   VERIFY( *r.ptr == '*' );
  36
  37   r = std::to_chars(buf, buf + 3, 0b1000, 2);
  38   VERIFY( r.ec == std::errc::value_too_large );
  39   VERIFY( r.ptr == buf + 3 );
  40   VERIFY( *r.ptr == '*' );
  41   r = std::to_chars(buf, buf + 4, 0b1000, 2);
  42   VERIFY( r.ec == std::errc{} );
  43   VERIFY( r.ptr == buf + 4 );
  44   VERIFY( *r.ptr == '*' );
  45
  46   r = std::to_chars(buf, buf + 4, 010000, 8);
  47   VERIFY( r.ec == std::errc::value_too_large );
  48   VERIFY( r.ptr == buf + 4 );
  49   VERIFY( *r.ptr == '*' );
  50   r = std::to_chars(buf, buf + 5, 010000, 8);
  51   VERIFY( r.ec == std::errc{} );
  52   VERIFY( r.ptr == buf + 5 );
  53   VERIFY( *r.ptr == '*' );
  54
  55   r = std::to_chars(buf, buf + 5, 100000, 10);
  56   VERIFY( r.ec == std::errc::value_too_large );
  57   VERIFY( r.ptr == buf + 5 );
  58   VERIFY( *r.ptr == '*' );
  59   r = std::to_chars(buf, buf + 6, 100000, 10);
  60   VERIFY( r.ec == std::errc{} );
  61   VERIFY( r.ptr == buf + 6 );
  62   VERIFY( *r.ptr == '*' );
  63
  64   r = std::to_chars(buf, buf + 6, 0x1000000, 16);
  65   VERIFY( r.ec == std::errc::value_too_large );
  66   VERIFY( r.ptr == buf + 6 );
  67   VERIFY( *r.ptr == '*' );
  68   r = std::to_chars(buf, buf + 7, 0x1000000, 16);
  69   VERIFY( r.ec == std::errc{} );
  70   VERIFY( r.ptr == buf + 7 );
  71   VERIFY( *r.ptr == '*' );
  72 }
  73
  74 int
  75 main()
  76 {
  77   test01();
  78 }