1// 2001-05-21 Benjamin Kosnik <bkoz@redhat.com> 2 3// Copyright (C) 2001-2015 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// 27.8.1.4 Overridden virtual functions 25 26// { dg-require-fileio "" } 27// { dg-require-binary-io "" } 28 29#include <fstream> 30#include <testsuite_hooks.h> 31#include <testsuite_io.h> 32 33// @require@ %-*.tst %-*.txt 34// @diff@ %-*.tst %*.txt 35 36const char name_01[] = "sgetn.txt"; // file with data in it 37const char name_03[] = "tmp_sgetn_1io.tst"; // empty file, need to create 38 39// Test overloaded virtual functions. 40void test05() 41{ 42 using namespace std; 43 using namespace __gnu_test; 44 typedef filebuf::int_type int_type; 45 typedef filebuf::traits_type traits_type; 46 47 bool test __attribute__((unused)) = true; 48 49 streamsize strmsz_1, strmsz_2; 50 char carray1[13] = ""; 51 char carray2[8192] = ""; 52 char buffer[8192] = ""; 53 int_type c1, c4; 54 55 // streamsize sgetn(char_type *s, streamsize n) 56 // streamsize xsgetn(char_type *s, streamsize n) 57 // assign up to n chars to s from input sequence, indexing in_cur as 58 // approp and returning the number of chars assigned 59 60 // in | out 1 61 { 62 constraint_filebuf fb_03; 63 fb_03.open(name_03, ios_base::out | ios_base::in | ios_base::trunc); 64 VERIFY( !fb_03.write_position() ); 65 VERIFY( !fb_03.read_position() ); 66 strmsz_1 = fb_03.sgetn(carray1, 10); 67 VERIFY( strmsz_1 == 0 ); 68 VERIFY( !fb_03.write_position() ); 69 VERIFY( !fb_03.read_position() ); 70 } 71 72 // in | out 2 73 { 74 constraint_filebuf fb_01; 75 // Need this since BUFSIZ is only guaranteed >= 255 and we want 76 // to trigger the same underflow situation everywhere. 77 fb_01.pubsetbuf(buffer, 8192); 78 fb_01.open(name_01, ios_base::in | ios_base::out); 79 VERIFY( !fb_01.write_position() ); 80 strmsz_1 = fb_01.in_avail(); 81 strmsz_2 = fb_01.sgetn(carray1, 10); 82 VERIFY( strmsz_2 == 10 ); 83 strmsz_2 = fb_01.in_avail(); 84 VERIFY( strmsz_1 > strmsz_2 ); 85 c1 = fb_01.sgetc(); 86 VERIFY( c1 == 'b' ); 87 strmsz_1 = fb_01.in_avail(); 88 strmsz_2 = fb_01.sgetn(carray2, strmsz_1 + 5); 89 VERIFY( strmsz_1 == strmsz_2 - 5 ); 90 c4 = fb_01.sgetc(); // buffer should have underflowed from above. 91 VERIFY( c4 == 'e' ); 92 strmsz_1 = fb_01.in_avail(); 93 VERIFY( strmsz_1 > 0 ); 94 strmsz_2 = fb_01.sgetn(carray2, strmsz_1 + 5); 95 VERIFY( strmsz_1 == strmsz_2 ); //at the end of the actual file 96 VERIFY( !fb_01.write_position() ); 97 VERIFY( !fb_01.read_position() ); 98 } 99} 100 101int main() 102{ 103 test05(); 104 return 0; 105} 106