libstdc++-v3/testsuite/27_io/basic_filebuf/sgetn/char/1-io.cc

   1 // 2001-05-21 Benjamin Kosnik  <bkoz@redhat.com>
   2
   3 // Copyright (C) 2001, 2002, 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 // 27.8.1.4 Overridden virtual functions
  22
  23 #include <fstream>
  24 #include <testsuite_hooks.h>
  25 #include <testsuite_io.h>
  26
  27 // @require@ %-*.tst %-*.txt
  28 // @diff@ %-*.tst %*.txt
  29
  30 const char name_01[] = "sgetn.txt"; // file with data in it
  31 const char name_03[] = "tmp_sgetn_1io.tst"; // empty file, need to create
  32
  33 // Test overloaded virtual functions.
  34 void test05()
  35 {
  36   using namespace std;
  37   using namespace __gnu_test;
  38   typedef filebuf::int_type     int_type;
  39   typedef filebuf::traits_type  traits_type;
  40
  41   bool test __attribute__((unused)) = true;
  42
  43   streamsize                    strmsz_1, strmsz_2;
  44   char carray1[13] = "";
  45   char carray2[8192] = "";
  46   char buffer[8192] = "";
  47   int_type                      c1, c4;
  48
  49   // streamsize sgetn(char_type *s, streamsize n)
  50   // streamsize xsgetn(char_type *s, streamsize n)
  51   // assign up to n chars to s from input sequence, indexing in_cur as
  52   // approp and returning the number of chars assigned
  53
  54   // in | out 1
  55   {
  56     constraint_filebuf fb_03;
  57     fb_03.open(name_03, ios_base::out | ios_base::in | ios_base::trunc);
  58     VERIFY( !fb_03.write_position() );
  59     VERIFY( !fb_03.read_position() );
  60     strmsz_1 = fb_03.sgetn(carray1, 10);
  61     VERIFY( strmsz_1 == 0 );
  62     VERIFY( !fb_03.write_position() );
  63     VERIFY( !fb_03.read_position() );
  64   }
  65
  66   // in | out 2
  67   {
  68     constraint_filebuf fb_01;
  69     // Need this since BUFSIZ is only guaranteed >= 255 and we want
  70     // to trigger the same underflow situation everywhere.
  71     fb_01.pubsetbuf(buffer, 8192);
  72     fb_01.open(name_01, ios_base::in | ios_base::out);
  73     VERIFY( !fb_01.write_position() );
  74     strmsz_1 = fb_01.in_avail();
  75     strmsz_2 = fb_01.sgetn(carray1, 10);
  76     VERIFY( strmsz_2 == 10 );
  77     strmsz_2 = fb_01.in_avail();
  78     VERIFY( strmsz_1 > strmsz_2 );
  79     c1 = fb_01.sgetc();
  80     VERIFY( c1 == 'b' );
  81     strmsz_1 = fb_01.in_avail();
  82     strmsz_2 = fb_01.sgetn(carray2, strmsz_1 + 5);
  83     VERIFY( strmsz_1 == strmsz_2 - 5 );
  84     c4 = fb_01.sgetc(); // buffer should have underflowed from above.
  85     VERIFY( c4 == 'h' );
  86     strmsz_1 = fb_01.in_avail();
  87     VERIFY( strmsz_1 > 0 );
  88     strmsz_2 = fb_01.sgetn(carray2, strmsz_1 + 5);
  89     VERIFY( strmsz_1 == strmsz_2 ); //at the end of the actual file
  90     VERIFY( !fb_01.write_position() );
  91     VERIFY( !fb_01.read_position() );
  92   }
  93 }
  94
  95 int main()
  96 {
  97   test05();
  98   return 0;
  99 }