libstdc++-v3/testsuite/27_io/basic_filebuf/setbuf/char/12875-1.cc

   1 // Copyright (C) 2003-2019 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 // 27.8.1.4 Overridden virtual functions
  19
  20 // { dg-require-fileio "" }
  21
  22 #include <fstream>
  23 #include <cstdio>
  24 #include <cstring>
  25 #include <testsuite_hooks.h>
  26
  27 // libstdc++/12875
  28 void test01()
  29 {
  30   using namespace std;
  31
  32   const char* name = "tmp_setbuf4";
  33   static char buf[1024];
  34
  35   FILE* out = fopen(name, "w");
  36   fputs("Hello, world", out);
  37   fclose(out);
  38
  39   filebuf in;
  40   in.open(name, ios_base::in);
  41   char str[256];
  42   streamsize r = in.sgetn(str, 6);
  43   VERIFY( r == 6 );
  44   VERIFY( !memcmp(str, "Hello,", 6) );
  45   in.pubsetbuf(buf, 1024);
  46   r = in.sgetn(str, 6);
  47   VERIFY( r == 6 );
  48   VERIFY( !memcmp(str, " world", 6) );
  49   in.close();
  50 }
  51
  52 // libstdc++/12875
  53 int main()
  54 {
  55   test01();
  56   return 0;
  57 }