libstdc++-v3/testsuite/27_io/basic_filebuf/sputn/char/1-io.cc

   1 // 2001-05-21 Benjamin Kosnik  <bkoz@redhat.com>
   2
   3 // Copyright (C) 2001-2019 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 // { dg-require-fileio "" }
  23
  24 #include <fstream>
  25 #include <testsuite_hooks.h>
  26 #include <testsuite_io.h>
  27
  28 // @require@ %-*.tst %-*.txt
  29 // @diff@ %-*.tst %*.txt
  30
  31 const char name_01[] = "filebuf_virtuals-1.txt"; // file with data in it
  32 const char name_03[] = "tmp_sputn_1io.tst"; // empty file, need to create
  33
  34 void test05()
  35 {
  36   using namespace std;
  37   using namespace __gnu_test;
  38
  39   typedef filebuf::int_type     int_type;
  40   typedef filebuf::traits_type  traits_type;
  41   typedef size_t                        size_type;
  42
  43   streamsize                    strmsz_1, strmsz_2;
  44
  45   // streamsize sputn(const char_typs* s, streamsize n)
  46   // write up to n chars to out_cur from s, returning number assigned
  47   // NB *sputn will happily put '\0' into your stream if you give it a chance*
  48
  49   // in | out
  50   {
  51     constraint_filebuf fb_03;
  52     fb_03.open(name_03, ios_base::out | ios_base::in | ios_base::trunc);
  53     VERIFY( !fb_03.write_position() );
  54     VERIFY( !fb_03.read_position() );
  55     strmsz_1 = fb_03.sputn("racadabras", 10);//"abracadabras or what?"
  56     VERIFY( strmsz_1 == 10 );
  57     strmsz_2 = fb_03.sputn(", i wanna reach out and", 10);
  58     VERIFY( strmsz_2 == 10 );
  59     VERIFY( strmsz_1 == strmsz_2 );
  60     VERIFY( fb_03.write_position() );
  61     VERIFY( !fb_03.read_position() );
  62   }
  63 }
  64
  65 int main()
  66 {
  67   test05();
  68   return 0;
  69 }