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

   1 // 2003-04-12  Paolo Carlini  <pcarlini at unitus dot it>
   2
   3 // Copyright (C) 2003-2018 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 // stdio_filebuf.h
  21
  22 // { dg-require-fileio "" }
  23
  24 #include <ext/stdio_filebuf.h>
  25 #include <cstdio>
  26 #include <fstream>
  27 #include <cstring>
  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
  36   const char* name = "tmp_file1";
  37   FILE* file = fopen(name, "w");
  38   {
  39     using namespace __gnu_cxx;
  40     stdio_filebuf<char> sbuf(file, ios_base::out, 2);
  41     sbuf.sputc('T');
  42     sbuf.sputc('S');
  43     sbuf.sputc('P');
  44   }
  45   fclose(file);
  46
  47   filebuf fbuf;
  48   fbuf.open(name, ios_base::in);
  49   char buf[10];
  50   streamsize n = fbuf.sgetn(buf, sizeof(buf));
  51   fbuf.close();
  52
  53   VERIFY( n == 3 );
  54   VERIFY( !memcmp(buf, "TSP", 3) );
  55 }
  56
  57 int main()
  58 {
  59   test01();
  60 }