libstdc++-v3/testsuite/27_io/basic_filebuf/sgetn/char/1-out.cc

   1 // 2001-05-21 Benjamin Kosnik  <bkoz@redhat.com>
   2
   3 // Copyright (C) 2001-2018 Free Software Foundation, Inc.
   4 //
   5 // This file is part of the GNU ISO C++ Library.  This library is free
   6 // software; you can redistribute it and/or modify it under the
   7 // terms of the GNU General Public License as published by the
   8 // Free Software Foundation; either version 3, or (at your option)
   9 // any later version.
  10
  11 // This library is distributed in the hope that it will be useful,
  12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 // GNU General Public License for more details.
  15
  16 // You should have received a copy of the GNU General Public License along
  17 // with this library; see the file COPYING3.  If not see
  18 // <http://www.gnu.org/licenses/>.
  19
  20 // 27.8.1.4 Overridden virtual functions
  21
  22 #include <fstream>
  23 #include <testsuite_hooks.h>
  24 #include <testsuite_io.h>
  25
  26 // @require@ %-*.tst %-*.txt
  27 // @diff@ %-*.tst %*.txt
  28
  29 const char name_02[] = "tmp_sgetn_1out.tst"; // empty file, need to create
  30
  31 // Test overloaded virtual functions.
  32 void test05()
  33 {
  34   using namespace std;
  35   using namespace __gnu_test;
  36   typedef filebuf::int_type     int_type;
  37   typedef filebuf::traits_type  traits_type;
  38
  39   streamsize                    strmsz_1, strmsz_2;
  40   char carray2[8192] = "";
  41   int_type                      c2, c4;
  42
  43   // streamsize sgetn(char_type *s, streamsize n)
  44   // streamsize xsgetn(char_type *s, streamsize n)
  45   // assign up to n chars to s from input sequence, indexing in_cur as
  46   // approp and returning the number of chars assigned
  47
  48   // out
  49   {
  50     constraint_filebuf fb_02;
  51     fb_02.open(name_02, ios_base::out | ios_base::trunc);
  52     VERIFY( !fb_02.write_position() );
  53     VERIFY( !fb_02.read_position() );
  54     strmsz_2 = fb_02.in_avail();
  55     strmsz_2 = fb_02.sgetn(carray2, 10);
  56     VERIFY( strmsz_2 == 0 );
  57     c2 = fb_02.sgetc();
  58     VERIFY( c2 == traits_type::eof() );
  59     strmsz_1 = fb_02.in_avail();
  60     strmsz_2 = fb_02.sgetn(carray2, strmsz_1 + 5);
  61     VERIFY( strmsz_1 == -1 );
  62     VERIFY( strmsz_2 == 0 );
  63     c4 = fb_02.sgetc();
  64     VERIFY( c4 == traits_type::eof() );
  65     VERIFY( !fb_02.write_position() );
  66     VERIFY( !fb_02.read_position() );
  67   }
  68 }
  69
  70 int main()
  71 {
  72   test05();
  73   return 0;
  74 }