84 lines
2.8 KiB
C++
84 lines
2.8 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is dual licensed under the MIT and the University of Illinois Open
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// Source Licenses. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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// <fstream>
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// pos_type seekoff(off_type off, ios_base::seekdir way,
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// ios_base::openmode which = ios_base::in | ios_base::out);
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// pos_type seekpos(pos_type sp,
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// ios_base::openmode which = ios_base::in | ios_base::out);
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// This test is not entirely portable
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#include <fstream>
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#include <cassert>
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template <class CharT>
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struct test_buf
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: public std::basic_filebuf<CharT>
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{
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typedef std::basic_filebuf<CharT> base;
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typedef typename base::char_type char_type;
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typedef typename base::int_type int_type;
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typedef typename base::pos_type pos_type;
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char_type* eback() const {return base::eback();}
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char_type* gptr() const {return base::gptr();}
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char_type* egptr() const {return base::egptr();}
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void gbump(int n) {base::gbump(n);}
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virtual int_type underflow() {return base::underflow();}
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};
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int main()
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{
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{
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char buf[10];
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typedef std::filebuf::pos_type pos_type;
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std::filebuf f;
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f.pubsetbuf(buf, sizeof(buf));
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assert(f.open("seekoff.dat", std::ios_base::in | std::ios_base::out
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| std::ios_base::trunc) != 0);
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assert(f.is_open());
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f.sputn("abcdefghijklmnopqrstuvwxyz", 26);
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assert(buf[0] == 'v');
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pos_type p = f.pubseekoff(-15, std::ios_base::cur);
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assert(p == 11);
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assert(f.sgetc() == 'l');
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f.pubseekoff(0, std::ios_base::beg);
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assert(f.sgetc() == 'a');
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f.pubseekoff(-1, std::ios_base::end);
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assert(f.sgetc() == 'z');
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assert(f.pubseekpos(p) == p);
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assert(f.sgetc() == 'l');
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}
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std::remove("seekoff.dat");
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{
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wchar_t buf[10];
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typedef std::filebuf::pos_type pos_type;
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std::wfilebuf f;
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f.pubsetbuf(buf, sizeof(buf)/sizeof(buf[0]));
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assert(f.open("seekoff.dat", std::ios_base::in | std::ios_base::out
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| std::ios_base::trunc) != 0);
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assert(f.is_open());
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f.sputn(L"abcdefghijklmnopqrstuvwxyz", 26);
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assert(buf[0] == L'v');
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pos_type p = f.pubseekoff(-15, std::ios_base::cur);
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assert(p == 11);
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assert(f.sgetc() == L'l');
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f.pubseekoff(0, std::ios_base::beg);
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assert(f.sgetc() == L'a');
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f.pubseekoff(-1, std::ios_base::end);
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assert(f.sgetc() == L'z');
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assert(f.pubseekpos(p) == p);
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assert(f.sgetc() == L'l');
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}
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std::remove("seekoff.dat");
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}
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