gomp-20050608-branch/libstdc++-v3/testsuite/27_io/basic_stringbuf/seekoff/char/1.cc

   1 // 981208 bkoz test functionality of basic_stringbuf for char_type == char
   2
   3 // Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004
   4 // Free Software Foundation, Inc.
   5 //
   6 // This file is part of the GNU ISO C++ Library.  This library is free
   7 // software; you can redistribute it and/or modify it under the
   8 // terms of the GNU General Public License as published by the
   9 // Free Software Foundation; either version 2, or (at your option)
  10 // any later version.
  11
  12 // This library is distributed in the hope that it will be useful,
  13 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 // GNU General Public License for more details.
  16
  17 // You should have received a copy of the GNU General Public License along
  18 // with this library; see the file COPYING.  If not, write to the Free
  19 // Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
  20 // USA.
  21
  22 #include <sstream>
  23 #include <testsuite_hooks.h>
  24
  25 std::string str_01("mykonos. . . or what?");
  26 std::stringbuf strb_01(str_01);
  27
  28 // test overloaded virtual functions
  29 void test04()
  30 {
  31   bool test __attribute__((unused)) = true;
  32   std::string           str_tmp;
  33   std::streamsize               strmsz_1, strmsz_2;
  34   typedef std::stringbuf::int_type int_type;
  35   typedef std::stringbuf::traits_type traits_type;
  36   typedef std::stringbuf::pos_type pos_type;
  37   typedef std::stringbuf::off_type off_type;
  38
  39   int_type c1 = strb_01.sbumpc();
  40   int_type c2, c3;
  41
  42   // BUFFER MANAGEMENT & POSITIONING
  43
  44   // seekoff
  45   // pubseekoff(off_type off, ios_base::seekdir way, ios_base::openmode which)
  46   // alters the stream position to off
  47   pos_type pt_1(off_type(-1));
  48   pos_type pt_2(off_type(0));
  49   off_type off_1 = 0;
  50   off_type off_2 = 0;
  51   strb_01.str(str_01); //in|out ("mykonos. . . or what?");
  52
  53   //IN|OUT
  54   //beg
  55   pt_1 = strb_01.pubseekoff(2, std::ios_base::beg);
  56   off_1 = off_type(pt_1);
  57   VERIFY( off_1 >= 0 );
  58   c1 = strb_01.snextc(); //current in pointer +1
  59   VERIFY( c1 == 'o' );
  60   c2 = strb_01.sputc('x');  //test current out pointer
  61   str_tmp = std::string("myxonos. . . or what?");
  62   VERIFY( strb_01.str() == str_tmp );
  63   //cur
  64   pt_1 = strb_01.pubseekoff(2, std::ios_base::cur);
  65   off_1 = off_type(pt_1);
  66   VERIFY( off_1 == -1 ); // can't seekoff for in and out + cur in sstreams
  67   pt_1 = strb_01.pubseekoff(2, std::ios_base::cur, std::ios_base::in);
  68   off_1 = off_type(pt_1);
  69   pt_2 = strb_01.pubseekoff(2, std::ios_base::cur, std::ios_base::in);
  70   off_2 = off_type(pt_2);
  71   VERIFY( off_2 == off_1 + 2 );
  72   c1 = strb_01.snextc(); //current in pointer + 1
  73   VERIFY( c1 == ' ' );
  74   c2 = strb_01.sputc('x');  //test current out pointer
  75   str_tmp = std::string("myxxnos. . . or what?");
  76   VERIFY( strb_01.str() == str_tmp );
  77   //end
  78   pt_2 = strb_01.pubseekoff(2, std::ios_base::end);
  79   off_1 = off_type(pt_2);
  80   VERIFY( off_1 == -1 ); // not a valid position
  81   VERIFY( strb_01.str() == str_tmp );
  82   // end part two (from the filebuf tests)
  83   strb_01.pubseekoff(0, std::ios_base::end);
  84   strmsz_1 = strb_01.in_avail(); // 0 cuz at the end
  85   c1 = strb_01.sgetc();
  86   c2 = strb_01.sungetc();
  87   strmsz_2 = strb_01.in_avail(); // 1
  88   c3 = strb_01.sgetc();
  89   VERIFY( c1 != c2 );
  90   VERIFY( strmsz_2 != strmsz_1 );
  91   VERIFY( strmsz_2 == 1 );
  92   // end part three
  93   strmsz_1 = strb_01.str().size();
  94   strmsz_2 = strb_01.sputn(" ravi shankar meets carlos santana in LoHa", 90);
  95   strb_01.pubseekoff(0, std::ios_base::end);
  96   strb_01.sputc('<');
  97   str_tmp = strb_01.str();
  98   VERIFY(static_cast<std::streamsize>(str_tmp.size()) == strmsz_1 + strmsz_2 + 1);
  99   // IN
 100   // OUT
 101 }
 102
 103 int main()
 104 {
 105   test04();
 106   return 0;
 107 }
 108
 109
 110
 111 // more candy!!!