libstdc++-v3/testsuite/27_io/basic_filebuf/sputbackc/char/1.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 <unistd.h>
  25 #include <signal.h>
  26 #include <fcntl.h>
  27 #include <sys/types.h>
  28 #include <sys/stat.h>
  29 #include <locale>
  30 #include <testsuite_hooks.h>
  31
  32 // @require@ %-*.tst %-*.txt
  33 // @diff@ %-*.tst %*.txt
  34
  35 // NB: This test assumes that _M_buf_size == 40, and not the usual
  36 // buffer_size length of BUFSIZ (8192), so that overflow/underflow can be
  37 // simulated a bit more readily.
  38 // NRB (Nota Really Bene): setting it to 40 breaks the test, as intended.
  39 const int buffer_size = 8192;
  40 //const int buffer_size = 40;
  41
  42 const char carray_01[] = "santa cruz or sandiego?";
  43 const char carray_02[] = "memphis, new orleans, and savanah";
  44 const char name_01[] = "filebuf_virtuals-1.txt"; // file with data in it
  45 const char name_02[] = "filebuf_virtuals-2.txt"; // empty file, need to create
  46 const char name_03[] = "filebuf_virtuals-3.txt"; // empty file, need to create
  47 const char name_04[] = "filebuf_virtuals-4.txt"; // empty file, need to create
  48 const char name_05[] = "filebuf_virtuals-5.txt"; // empty file, need to create
  49 const char name_06[] = "filebuf_virtuals-6.txt"; // empty file, need to create
  50 const char name_07[] = "filebuf_virtuals-7.txt"; // empty file, need to create
  51 const char name_08[] = "filebuf_virtuals-8.txt"; // empty file, need to create
  52
  53 class derived_filebuf: public std::filebuf
  54 {
  55  public:
  56   void
  57   set_size(int_type __size) { _M_buf_size_opt = __size; }
  58 };
  59
  60 derived_filebuf fb_01; // in
  61 derived_filebuf fb_02; // out
  62 derived_filebuf fb_03; // in | out
  63
  64 // Initialize filebufs to be the same size regardless of platform.
  65 void test03()
  66 {
  67   fb_01.set_size(buffer_size);
  68   fb_02.set_size(buffer_size);
  69   fb_03.set_size(buffer_size);
  70 }
  71
  72 // Test overloaded virtual functions.
  73 void test05()
  74 {
  75   typedef std::filebuf::int_type        int_type;
  76   typedef std::filebuf::traits_type     traits_type;
  77   typedef std::filebuf::pos_type        pos_type;
  78   typedef std::filebuf::off_type        off_type;
  79   typedef size_t                        size_type;
  80
  81   bool                                  test = true;
  82   std::filebuf                          f_tmp;
  83   std::streamsize                       strmsz_1, strmsz_2;
  84   std::streamoff                        strmof_1, strmof_2;
  85   int                                   i = 0, j = 0, k = 0;
  86
  87   fb_01.open(name_01, std::ios_base::in);
  88   fb_02.open(name_02, std::ios_base::out | std::ios_base::trunc);
  89   fb_03.open(name_03, std::ios_base::out | std::ios_base::in | std::ios_base::trunc);
  90
  91   int_type c1 = fb_01.sbumpc();
  92   int_type c2 = fb_02.sbumpc();
  93   int_type c3 = fb_01.sbumpc();
  94   int_type c4 = fb_02.sbumpc();
  95   int_type c5 = fb_03.sbumpc();
  96   int_type c6 = fb_01.sgetc();
  97   int_type c7 = fb_02.sgetc();
  98   int_type c8 = fb_01.sgetc();
  99   int_type c9 = fb_02.sgetc();
 100
 101   // PUT
 102   strmsz_1 = fb_03.sputn("racadabras", 10);//"abracadabras or what?"
 103   strmsz_2 = fb_03.sputn(", i wanna reach out and", 10);
 104   strmsz_1 = fb_02.sputn("racadabras", 10);
 105   strmsz_1 = fb_01.sputn("racadabra", 10);
 106
 107   // PUTBACK
 108   // int_type pbfail(int_type c)
 109   // called when gptr() null, gptr() == eback(), or traits::eq(*gptr, c) false
 110   // "pending sequence" is:
 111   //    1) everything as defined in underflow
 112   //    2) + if (traits::eq_int_type(c, traits::eof()), then input
 113   //    sequence is backed up one char before the pending sequence is
 114   //    determined.
 115   //    3) + if (not 2) then c is prepended. Left unspecified is
 116   //    whether the input sequence is backedup or modified in any way
 117   // returns traits::eof() for failure, unspecified other value for success
 118
 119   // int_type sputbackc(char_type c)
 120   // if in_cur not avail || ! traits::eq(c, gptr() [-1]), return pbfail
 121   // otherwise decrements in_cur and returns *gptr()
 122   c1 = fb_03.sgetc(); // -1
 123   c2 = fb_03.sputbackc('z');
 124   strmsz_2 = fb_03.in_avail();
 125   c3 = fb_03.sgetc();
 126   VERIFY( c3 == c2 );
 127   VERIFY( c1 != c3 );
 128   VERIFY( 1 == strmsz_2 );
 129   //test for _in_cur == _in_beg
 130   // fb_03._M_out_beg = "bd23456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZracada" etc
 131   fb_03.pubseekoff(10, std::ios_base::beg,
 132                    std::ios_base::in | std::ios_base::out);
 133   fb_03.sputc('m');
 134   strmsz_1 = fb_03.in_avail();
 135   c1 = fb_03.sgetc();
 136   fb_03.snextc();
 137   c2 = fb_03.sputbackc('z');
 138   strmsz_2 = fb_03.in_avail();
 139   c3 = fb_03.sgetc();
 140   VERIFY( c1 != c2 );
 141   VERIFY( c3 == c2 );
 142   VERIFY( c1 != c3 );
 143   VERIFY( c2 == 'z' );
 144   //  VERIFY( strmsz_1 == strmsz_2 );
 145   // test for replacing char with identical one
 146   fb_03.snextc();
 147   fb_03.sputc('u');
 148   fb_03.sputc('v');
 149   fb_03.sputc('a');
 150   strmsz_1 = fb_03.in_avail();
 151   c2 = fb_03.sputbackc('a');
 152   strmsz_2 = fb_03.in_avail();
 153   c3 = fb_03.sgetc();
 154   VERIFY( c3 == c2 );
 155   VERIFY( strmsz_1 + 1 == strmsz_2 );
 156   //test for ios_base::out
 157   c1 = fb_02.sgetc(); // undefined
 158   c2 = fb_02.sputbackc('a');
 159   VERIFY( c1 == c2 );
 160   VERIFY( c1 == -1 );
 161 }
 162
 163 main()
 164 {
 165   test03();
 166   test05();
 167   return 0;
 168 }