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// 2001-05-21 Benjamin Kosnik <bkoz@redhat.com>
// Copyright (C) 2001, 2002, 2003 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 2, or (at your option)
// any later version.
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License along
// with this library; see the file COPYING. If not, write to the Free
// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
// USA.
// 27.8.1.4 Overridden virtual functions
#include <fstream>
#include <unistd.h>
#include <signal.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <locale>
#include <testsuite_hooks.h>
// @require@ %-*.tst %-*.txt
// @diff@ %-*.tst %*.txt
// NB: This test assumes that _M_buf_size == 40, and not the usual
// buffer_size length of BUFSIZ (8192), so that overflow/underflow can be
// simulated a bit more readily.
// NRB (Nota Really Bene): setting it to 40 breaks the test, as intended.
const int buffer_size = 8192;
//const int buffer_size = 40;
const char carray_01[] = "santa cruz or sandiego?";
const char carray_02[] = "memphis, new orleans, and savanah";
const char name_01[] = "filebuf_virtuals-1.txt"; // file with data in it
const char name_02[] = "filebuf_virtuals-2.txt"; // empty file, need to create
const char name_03[] = "filebuf_virtuals-3.txt"; // empty file, need to create
const char name_04[] = "filebuf_virtuals-4.txt"; // empty file, need to create
const char name_05[] = "filebuf_virtuals-5.txt"; // empty file, need to create
const char name_06[] = "filebuf_virtuals-6.txt"; // empty file, need to create
const char name_07[] = "filebuf_virtuals-7.txt"; // empty file, need to create
const char name_08[] = "filebuf_virtuals-8.txt"; // empty file, need to create
class derived_filebuf: public std::filebuf
{
public:
void
set_size(int_type __size) { _M_buf_size = __size; }
};
derived_filebuf fb_01; // in
derived_filebuf fb_02; // out
derived_filebuf fb_03; // in | out
// Initialize filebufs to be the same size regardless of platform.
void test03()
{
fb_01.set_size(buffer_size);
fb_02.set_size(buffer_size);
fb_03.set_size(buffer_size);
}
// Test overloaded virtual functions.
void test05()
{
typedef std::filebuf::int_type int_type;
typedef std::filebuf::traits_type traits_type;
typedef std::filebuf::pos_type pos_type;
typedef std::filebuf::off_type off_type;
typedef size_t size_type;
bool test = true;
std::filebuf f_tmp;
std::streamsize strmsz_1, strmsz_2;
std::streamoff strmof_1, strmof_2;
int i = 0, j = 0, k = 0;
fb_01.open(name_01, std::ios_base::in);
fb_02.open(name_02, std::ios_base::out | std::ios_base::trunc);
fb_03.open(name_03, std::ios_base::out | std::ios_base::in | std::ios_base::trunc);
int_type c1 = fb_01.sbumpc();
int_type c2 = fb_02.sbumpc();
int_type c3 = fb_01.sbumpc();
int_type c4 = fb_02.sbumpc();
int_type c5 = fb_03.sbumpc();
int_type c6 = fb_01.sgetc();
int_type c7 = fb_02.sgetc();
int_type c8 = fb_01.sgetc();
int_type c9 = fb_02.sgetc();
// PUT
strmsz_1 = fb_03.sputn("racadabras", 10);//"abracadabras or what?"
strmsz_2 = fb_03.sputn(", i wanna reach out and", 10);
strmsz_1 = fb_02.sputn("racadabras", 10);
strmsz_1 = fb_01.sputn("racadabra", 10);
// PUTBACK
// int_type pbfail(int_type c)
// called when gptr() null, gptr() == eback(), or traits::eq(*gptr, c) false
// "pending sequence" is:
// 1) everything as defined in underflow
// 2) + if (traits::eq_int_type(c, traits::eof()), then input
// sequence is backed up one char before the pending sequence is
// determined.
// 3) + if (not 2) then c is prepended. Left unspecified is
// whether the input sequence is backedup or modified in any way
// returns traits::eof() for failure, unspecified other value for success
// int_type sputbackc(char_type c)
// if in_cur not avail || ! traits::eq(c, gptr() [-1]), return pbfail
// otherwise decrements in_cur and returns *gptr()
c1 = fb_03.sgetc(); // -1
c2 = fb_03.sputbackc('z');
strmsz_2 = fb_03.in_avail();
c3 = fb_03.sgetc();
VERIFY( c3 == c2 );
VERIFY( c1 != c3 );
VERIFY( 1 == strmsz_2 );
//test for _in_cur == _in_beg
// fb_03._M_out_beg = "bd23456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZracada" etc
fb_03.pubseekoff(10, std::ios_base::beg,
std::ios_base::in | std::ios_base::out);
fb_03.sputc('m');
strmsz_1 = fb_03.in_avail();
c1 = fb_03.sgetc();
fb_03.snextc();
c2 = fb_03.sputbackc('z');
strmsz_2 = fb_03.in_avail();
c3 = fb_03.sgetc();
VERIFY( c1 != c2 );
VERIFY( c3 == c2 );
VERIFY( c1 != c3 );
VERIFY( c2 == 'z' );
// VERIFY( strmsz_1 == strmsz_2 );
// test for replacing char with identical one
fb_03.snextc();
fb_03.sputc('u');
fb_03.sputc('v');
fb_03.sputc('a');
strmsz_1 = fb_03.in_avail();
c2 = fb_03.sputbackc('a');
strmsz_2 = fb_03.in_avail();
c3 = fb_03.sgetc();
VERIFY( c3 == c2 );
VERIFY( strmsz_1 + 1 == strmsz_2 );
//test for ios_base::out
c1 = fb_02.sgetc(); // undefined
c2 = fb_02.sputbackc('a');
VERIFY( c1 == c2 );
VERIFY( c1 == -1 );
}
main()
{
test03();
test05();
return 0;
}
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