libstdc++-v3/testsuite/ext/stdio_filebuf/char/2.cc

   1 // 2003-04-12  Paolo Carlini  <pcarlini at unitus dot it>
   2
   3 // Copyright (C) 2003 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 2, 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 COPYING.  If not, write to the Free
  18 // Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
  19 // USA.
  20
  21 // stdio_filebuf.h
  22
  23 // { dg-require-fileio "" }
  24
  25 #include <ext/stdio_filebuf.h>
  26 #include <cstdio>
  27 #include <fstream>
  28 #include <testsuite_hooks.h>
  29
  30 // Small stack-based buffers (i.e., using _M_unbuf) were not flushed
  31 // out by _M_really_overflow upon overflow.
  32 void test01()
  33 {
  34   using namespace std;
  35   bool test __attribute__((unused)) = true;
  36
  37   const char* name = "tmp_file1";
  38   FILE* file = fopen(name, "w");
  39   {
  40     using namespace __gnu_cxx;
  41     stdio_filebuf<char> sbuf(file, ios_base::out, 2);
  42     sbuf.sputc('T');
  43     sbuf.sputc('S');
  44     sbuf.sputc('P');
  45   }
  46   fclose(file);
  47
  48   filebuf fbuf;
  49   fbuf.open(name, ios_base::in);
  50   char buf[10];
  51   streamsize n = fbuf.sgetn(buf, sizeof(buf));
  52   fbuf.close();
  53
  54   VERIFY( n == 3 );
  55   VERIFY( !memcmp(buf, "TSP", 3) );
  56 }
  57
  58 int main()
  59 {
  60   test01();
  61 }