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) 2001-2020 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 3, 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 COPYING3.  If not see
  18 // <http://www.gnu.org/licenses/>.
  19
  20 // 27.8.1.4 Overridden virtual functions
  21
  22 // { dg-require-fileio "" }
  23
  24 #include <fstream>
  25 #include <testsuite_hooks.h>
  26 #include <testsuite_io.h>
  27
  28 // @require@ %-*.tst %-*.txt
  29 // @diff@ %-*.tst %*.txt
  30
  31 const char name_01[] = "tmp_sputbackc_1io.tst"; // empty file, need to create
  32
  33 void test01()
  34 {
  35   using namespace std;
  36   using namespace __gnu_test;
  37
  38   typedef filebuf::int_type     int_type;
  39   typedef filebuf::traits_type  traits_type;
  40   typedef size_t                        size_type;
  41
  42   streamsize                    strmsz_1, strmsz_2;
  43   int_type                      c1, c2, c3;
  44
  45   // int_type sputbackc(char_type c)
  46   // if in_cur not avail || ! traits::eq(c, gptr() [-1]), return pbfail
  47   // otherwise decrements in_cur and returns *gptr()
  48
  49   // in | out
  50   {
  51     constraint_filebuf fb_01;
  52     fb_01.open(name_01, ios_base::out | ios_base::in | ios_base::trunc);
  53     VERIFY( !fb_01.write_position() );
  54     VERIFY( !fb_01.read_position() );
  55     strmsz_1 = fb_01.sputn("racadabras", 10);//"abracadabras or what?"
  56     strmsz_2 = fb_01.sputn(", i wanna reach out and", 10);
  57     fb_01.pubseekoff(0, std::ios_base::cur);
  58     c1 = fb_01.sgetc(); // -1
  59     c2 = fb_01.sputbackc('z');
  60     strmsz_2 = fb_01.in_avail();
  61     c3 = fb_01.sgetc();
  62     VERIFY( c3 == c2 );
  63     VERIFY( c1 != c3 );
  64     VERIFY( 1 == strmsz_2 );
  65     //test for _in_cur == _in_beg
  66     // fb_01._M_out_beg = "bd23456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZracada" etc
  67     fb_01.pubseekoff(10, std::ios_base::beg);
  68     fb_01.sputc('m');
  69     fb_01.pubseekoff(0, std::ios_base::cur);
  70     strmsz_1 = fb_01.in_avail();
  71     c1 = fb_01.sgetc();
  72     fb_01.snextc();
  73     c2 = fb_01.sputbackc('z');
  74     strmsz_2 = fb_01.in_avail();
  75     c3 = fb_01.sgetc();
  76     VERIFY( c1 != c2 );
  77     VERIFY( c3 == c2 );
  78     VERIFY( c1 != c3 );
  79     VERIFY( c2 == 'z' );
  80     // test for replacing char with identical one
  81     fb_01.snextc();
  82     fb_01.pubseekoff(0, std::ios_base::cur);
  83     fb_01.sputc('u');
  84     fb_01.sputc('v');
  85     fb_01.sputc('a');
  86     fb_01.pubseekoff(0, std::ios_base::end);
  87     strmsz_1 = fb_01.in_avail();
  88     c2 = fb_01.sputbackc('a');
  89     strmsz_2 = fb_01.in_avail();
  90     c3 = fb_01.sgetc();
  91     VERIFY( c3 == c2 );
  92     VERIFY( strmsz_1 + 1 == strmsz_2 );
  93     VERIFY( !fb_01.write_position() );
  94     VERIFY( fb_01.read_position() );
  95   }
  96 }
  97
  98 int main()
  99 {
 100   test01();
 101   return 0;
 102 }