libstdc++-v3/testsuite/27_io/objects/wchar_t/9661-1.cc

   1 // 2003-04-30  Petur Runolfsson <peturr02@ru.is>
   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, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
  19 // USA.
  20
  21 #include <testsuite_hooks.h>
  22 #include <cstdio>
  23 #include <iostream>
  24 #include <unistd.h>
  25 #include <signal.h>
  26 #include <fcntl.h>
  27 #include <sys/types.h>
  28 #include <sys/stat.h>
  29
  30 // Check that wcin.rdbuf()->sputbackc() puts characters back to stdin.
  31 // If wcin.rdbuf() is a filebuf, this succeeds when stdin is a regular
  32 // file, but fails otherwise, hence the named fifo.
  33 void test01()
  34 {
  35   using namespace std;
  36
  37   bool test __attribute__((unused)) = true;
  38
  39   const char* name = "tmp_fifo5";
  40
  41   signal(SIGPIPE, SIG_IGN);
  42
  43   unlink(name);
  44   mkfifo(name, S_IRWXU);
  45
  46   int child = fork();
  47   VERIFY( child != -1 );
  48
  49   if (child == 0)
  50     {
  51       sleep(1);
  52       FILE* file = fopen(name, "w");
  53       fputs("Whatever\n", file);
  54       fflush(file);
  55       sleep(2);
  56       fclose(file);
  57       exit(0);
  58     }
  59
  60   freopen(name, "r", stdin);
  61   sleep(2);
  62
  63   wint_t c1 = fgetwc(stdin);
  64   VERIFY( c1 != WEOF );
  65   wint_t c2 = wcin.rdbuf()->sputbackc(L'a');
  66   VERIFY( c2 != WEOF );
  67   VERIFY( c2 == L'a' );
  68
  69   wint_t c3 = fgetwc(stdin);
  70   VERIFY( c3 != WEOF );
  71   VERIFY( c3 == c2 );
  72   wint_t c4 = ungetwc(L'b', stdin);
  73   VERIFY( c4 != WEOF );
  74   VERIFY( c4 == L'b' );
  75
  76   wint_t c5 = wcin.rdbuf()->sgetc();
  77   VERIFY( c5 != WEOF );
  78   VERIFY( c5 == c4 );
  79 }
  80
  81 int main()
  82 {
  83   test01();
  84   return 0;
  85 }