libstdc++-v3/testsuite/ext/stdio_filebuf/char/10063-1.cc

   1 // Copyright (C) 2000-2021 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 // { dg-require-fileio "" }
  19
  20 #include <cstdio>
  21 #include <fstream>
  22 #include <cstring>
  23 #include <ext/stdio_filebuf.h>
  24 #include <testsuite_hooks.h>
  25
  26 void test1()
  27 {
  28   using namespace std;
  29
  30   FILE* file = fopen("tmp_10063-1", "w");
  31   putc('0', file);
  32   putc('1', file);
  33   {
  34     __gnu_cxx::stdio_filebuf<char> sbuf(file, ios_base::out);
  35     sbuf.sputc('2');
  36     sbuf.sputc('3');
  37   }
  38   putc('4', file);
  39   fclose(file);
  40
  41   filebuf fbuf;
  42   fbuf.open("tmp_10063-1", ios_base::in);
  43   char buf[10];
  44   streamsize n = fbuf.sgetn(buf, sizeof(buf));
  45   fbuf.close();
  46
  47   VERIFY(n == 5);
  48   VERIFY(!memcmp(buf, "01234", 5));
  49 }
  50
  51 int main()
  52 {
  53   test1();
  54   return 0;
  55 }