libstdc++-v3/testsuite/27_io/basic_filebuf/sgetn/char/2-io.cc

   1 // 2001-05-21 Benjamin Kosnik  <bkoz@redhat.com>
   2
   3 // Copyright (C) 2001-2024 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 // The ARM simulator does not provide support for "fstat", which
  21 // causes "in_avail" to return an incorrect value.
  22 // { dg-do run { xfail arm*-*-elf arm*-*-eabi } }
  23
  24 // C++98 27.8.1.4 Overridden virtual functions
  25
  26 // { dg-require-fileio "" }
  27 // { dg-require-binary-io "" }
  28 // { dg-additional-files "sgetn.txt" }
  29
  30 #include <fstream>
  31 #include <testsuite_hooks.h>
  32 #include <testsuite_io.h>
  33
  34 const char name_01[] = "sgetn.txt"; // file with data in it
  35 const char name_03[] = "tmp_sgetn_2io.tst"; // empty file, need to create
  36
  37 // Test overloaded virtual functions.
  38 void test05()
  39 {
  40   using namespace std;
  41   using namespace __gnu_test;
  42   typedef filebuf::int_type     int_type;
  43   typedef filebuf::traits_type  traits_type;
  44
  45   streamsize                    strmsz_1, strmsz_2;
  46   char carray1[13] = "";
  47   char carray2[8192] = "";
  48   int_type                      c1, c4;
  49
  50   // streamsize sgetn(char_type *s, streamsize n)
  51   // streamsize xsgetn(char_type *s, streamsize n)
  52   // assign up to n chars to s from input sequence, indexing in_cur as
  53   // approp and returning the number of chars assigned
  54
  55   // in | out 1
  56   {
  57     constraint_filebuf fb_03;
  58     fb_03.pubsetbuf(0, 0);
  59     fb_03.open(name_03, ios_base::out | ios_base::in | ios_base::trunc);
  60     VERIFY( fb_03.unbuffered() );
  61     strmsz_1 = fb_03.sgetn(carray1, 10);
  62     VERIFY( strmsz_1 == 0 );
  63     VERIFY( fb_03.unbuffered() );
  64   }
  65
  66   // in | out 2
  67   {
  68     constraint_filebuf fb_01;
  69     fb_01.pubsetbuf(0, 0);
  70     fb_01.open(name_01, ios_base::in | ios_base::out);
  71     VERIFY( fb_01.unbuffered() );
  72     strmsz_1 = fb_01.in_avail();
  73     strmsz_2 = fb_01.sgetn(carray1, 10);
  74     VERIFY( strmsz_2 == 10 );
  75     strmsz_2 = fb_01.in_avail();
  76     VERIFY( strmsz_1 > strmsz_2 );
  77     c1 = fb_01.sgetc();
  78     VERIFY( c1 == 'b' );
  79     strmsz_1 = fb_01.in_avail();
  80     strmsz_2 = fb_01.sgetn(carray2, 8181 + 5);
  81     VERIFY( 8181 == strmsz_2 - 5 );
  82     c4 = fb_01.sgetc(); // buffer should have underflowed from above.
  83     VERIFY( c4 == 'e' );
  84     strmsz_1 = fb_01.in_avail();
  85     VERIFY( strmsz_1 > 0 );
  86     strmsz_2 = fb_01.sgetn(carray2, 65 + 5);
  87     VERIFY( 70 == strmsz_2 ); //at the end of the actual file
  88     VERIFY( fb_01.unbuffered() );
  89   }
  90 }
  91
  92 int main()
  93 {
  94   test05();
  95   return 0;
  96 }