libstdc++-v3/testsuite/27_io/basic_filebuf/sputbackc/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, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
  19 // USA.
  20
  21 // 27.8.1.4 Overridden virtual functions
  22
  23 // { dg-require-fileio "" }
  24
  25 #include <fstream>
  26 #include <testsuite_hooks.h>
  27 #include <testsuite_io.h>
  28
  29 // @require@ %-*.tst %-*.txt
  30 // @diff@ %-*.tst %*.txt
  31
  32 const char name_01[] = "tmp_sputbackc_1io.tst"; // empty file, need to create
  33
  34 void test01()
  35 {
  36   using namespace std;
  37   using namespace __gnu_test;
  38
  39   typedef filebuf::int_type     int_type;
  40   typedef filebuf::traits_type  traits_type;
  41   typedef size_t                        size_type;
  42
  43   bool test __attribute__((unused)) = true;
  44   streamsize                    strmsz_1, strmsz_2;
  45   int_type                      c1, c2, c3;
  46
  47   // int_type sputbackc(char_type c)
  48   // if in_cur not avail || ! traits::eq(c, gptr() [-1]), return pbfail
  49   // otherwise decrements in_cur and returns *gptr()
  50
  51   // in | out
  52   {
  53     constraint_filebuf fb_01;
  54     fb_01.open(name_01, ios_base::out | ios_base::in | ios_base::trunc);
  55     VERIFY( !fb_01.write_position() );
  56     VERIFY( !fb_01.read_position() );
  57     strmsz_1 = fb_01.sputn("racadabras", 10);//"abracadabras or what?"
  58     strmsz_2 = fb_01.sputn(", i wanna reach out and", 10);
  59     fb_01.pubseekoff(0, std::ios_base::cur);
  60     c1 = fb_01.sgetc(); // -1
  61     c2 = fb_01.sputbackc('z');
  62     strmsz_2 = fb_01.in_avail();
  63     c3 = fb_01.sgetc();
  64     VERIFY( c3 == c2 );
  65     VERIFY( c1 != c3 );
  66     VERIFY( 1 == strmsz_2 );
  67     //test for _in_cur == _in_beg
  68     // fb_01._M_out_beg = "bd23456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZracada" etc
  69     fb_01.pubseekoff(10, std::ios_base::beg);
  70     fb_01.sputc('m');
  71     fb_01.pubseekoff(0, std::ios_base::cur);
  72     strmsz_1 = fb_01.in_avail();
  73     c1 = fb_01.sgetc();
  74     fb_01.snextc();
  75     c2 = fb_01.sputbackc('z');
  76     strmsz_2 = fb_01.in_avail();
  77     c3 = fb_01.sgetc();
  78     VERIFY( c1 != c2 );
  79     VERIFY( c3 == c2 );
  80     VERIFY( c1 != c3 );
  81     VERIFY( c2 == 'z' );
  82     // test for replacing char with identical one
  83     fb_01.snextc();
  84     fb_01.pubseekoff(0, std::ios_base::cur);
  85     fb_01.sputc('u');
  86     fb_01.sputc('v');
  87     fb_01.sputc('a');
  88     fb_01.pubseekoff(0, std::ios_base::end);
  89     strmsz_1 = fb_01.in_avail();
  90     c2 = fb_01.sputbackc('a');
  91     strmsz_2 = fb_01.in_avail();
  92     c3 = fb_01.sgetc();
  93     VERIFY( c3 == c2 );
  94     VERIFY( strmsz_1 + 1 == strmsz_2 );
  95     VERIFY( !fb_01.write_position() );
  96     VERIFY( fb_01.read_position() );
  97   }
  98 }
  99
 100 int main()
 101 {
 102   test01();
 103   return 0;
 104 }