libcxx/test/std/input.output/string.streams/stringbuf/stringbuf.virtuals/seekoff.pass.cpp

   1 //===----------------------------------------------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 // <sstream>
  10
  11 // template <class charT, class traits = char_traits<charT>, class Allocator = allocator<charT> >
  12 // class basic_stringbuf
  13
  14 // pos_type seekoff(off_type off, ios_base::seekdir way,
  15 //                  ios_base::openmode which = ios_base::in | ios_base::out);
  16
  17 #include <sstream>
  18 #include <cassert>
  19
  20 #include "test_macros.h"
  21
  22 int main(int, char**)
  23 {
  24     {
  25         std::stringbuf sb(std::ios_base::in);
  26         assert(sb.pubseekoff(3, std::ios_base::beg, std::ios_base::out) == -1);
  27         assert(sb.pubseekoff(3, std::ios_base::cur, std::ios_base::out) == -1);
  28         assert(sb.pubseekoff(-3, std::ios_base::end, std::ios_base::out) == -1);
  29         assert(sb.pubseekoff(3, std::ios_base::beg, std::ios_base::in | std::ios_base::out) == -1);
  30         assert(sb.pubseekoff(3, std::ios_base::cur, std::ios_base::in | std::ios_base::out) == -1);
  31         assert(sb.pubseekoff(-3, std::ios_base::end, std::ios_base::in | std::ios_base::out) == -1);
  32         assert(sb.pubseekoff(0, std::ios_base::beg, std::ios_base::in) == 0);
  33         assert(sb.pubseekoff(0, std::ios_base::cur, std::ios_base::in) == 0);
  34         assert(sb.pubseekoff(0, std::ios_base::end, std::ios_base::in) == 0);
  35     }
  36     {
  37         std::stringbuf sb(std::ios_base::out);
  38         assert(sb.pubseekoff(3, std::ios_base::beg, std::ios_base::in) == -1);
  39         assert(sb.pubseekoff(3, std::ios_base::cur, std::ios_base::in) == -1);
  40         assert(sb.pubseekoff(-3, std::ios_base::end, std::ios_base::in) == -1);
  41         assert(sb.pubseekoff(3, std::ios_base::beg, std::ios_base::in | std::ios_base::out) == -1);
  42         assert(sb.pubseekoff(3, std::ios_base::cur, std::ios_base::in | std::ios_base::out) == -1);
  43         assert(sb.pubseekoff(-3, std::ios_base::end, std::ios_base::in | std::ios_base::out) == -1);
  44         assert(sb.pubseekoff(0, std::ios_base::beg, std::ios_base::out) == 0);
  45         assert(sb.pubseekoff(0, std::ios_base::cur, std::ios_base::out) == 0);
  46         assert(sb.pubseekoff(0, std::ios_base::end, std::ios_base::out) == 0);
  47     }
  48     {
  49         std::stringbuf sb("0123456789", std::ios_base::in);
  50         assert(sb.pubseekoff(3, std::ios_base::beg, std::ios_base::out) == -1);
  51         assert(sb.pubseekoff(3, std::ios_base::cur, std::ios_base::out) == -1);
  52         assert(sb.pubseekoff(-3, std::ios_base::end, std::ios_base::out) == -1);
  53         assert(sb.pubseekoff(3, std::ios_base::beg, std::ios_base::in | std::ios_base::out) == -1);
  54         assert(sb.pubseekoff(3, std::ios_base::cur, std::ios_base::in | std::ios_base::out) == -1);
  55         assert(sb.pubseekoff(-3, std::ios_base::end, std::ios_base::in | std::ios_base::out) == -1);
  56         assert(sb.pubseekoff(3, std::ios_base::beg, std::ios_base::in) == 3);
  57         assert(sb.sgetc() == '3');
  58         assert(sb.pubseekoff(3, std::ios_base::cur, std::ios_base::in) == 6);
  59         assert(sb.sgetc() == '6');
  60         assert(sb.pubseekoff(-3, std::ios_base::end, std::ios_base::in) == 7);
  61         assert(sb.sgetc() == '7');
  62     }
  63     {
  64         std::stringbuf sb("0123456789", std::ios_base::out);
  65         assert(sb.pubseekoff(3, std::ios_base::beg, std::ios_base::in) == -1);
  66         assert(sb.pubseekoff(3, std::ios_base::cur, std::ios_base::in) == -1);
  67         assert(sb.pubseekoff(-3, std::ios_base::end, std::ios_base::in) == -1);
  68         assert(sb.pubseekoff(3, std::ios_base::beg, std::ios_base::out | std::ios_base::in) == -1);
  69         assert(sb.pubseekoff(3, std::ios_base::cur, std::ios_base::out | std::ios_base::in) == -1);
  70         assert(sb.pubseekoff(-3, std::ios_base::end, std::ios_base::out | std::ios_base::in) == -1);
  71         assert(sb.pubseekoff(3, std::ios_base::beg, std::ios_base::out) == 3);
  72         assert(sb.sputc('a') == 'a');
  73         assert(sb.str() == "012a456789");
  74         assert(sb.pubseekoff(3, std::ios_base::cur, std::ios_base::out) == 7);
  75         assert(sb.sputc('b') == 'b');
  76         assert(sb.str() == "012a456b89");
  77         assert(sb.pubseekoff(-3, std::ios_base::end, std::ios_base::out) == 7);
  78         assert(sb.sputc('c') == 'c');
  79         assert(sb.str() == "012a456c89");
  80     }
  81     {
  82         std::stringbuf sb("0123456789");
  83         assert(sb.pubseekoff(3, std::ios_base::beg, std::ios_base::in) == 3);
  84         assert(sb.sgetc() == '3');
  85         assert(sb.pubseekoff(3, std::ios_base::cur, std::ios_base::in) == 6);
  86         assert(sb.sgetc() == '6');
  87         assert(sb.pubseekoff(-3, std::ios_base::end, std::ios_base::in) == 7);
  88         assert(sb.sgetc() == '7');
  89         assert(sb.pubseekoff(3, std::ios_base::beg, std::ios_base::out | std::ios_base::in) == 3);
  90         assert(sb.sgetc() == '3');
  91         assert(sb.sputc('a') == 'a');
  92         assert(sb.str() == "012a456789");
  93         assert(sb.pubseekoff(3, std::ios_base::cur, std::ios_base::out | std::ios_base::in) == -1);
  94         assert(sb.pubseekoff(-3, std::ios_base::end, std::ios_base::out | std::ios_base::in) == 7);
  95         assert(sb.sgetc() == '7');
  96         assert(sb.sputc('c') == 'c');
  97         assert(sb.str() == "012a456c89");
  98         assert(sb.pubseekoff(3, std::ios_base::beg, std::ios_base::out) == 3);
  99         assert(sb.sputc('3') == '3');
 100         assert(sb.str() == "0123456c89");
 101         assert(sb.pubseekoff(3, std::ios_base::cur, std::ios_base::out) == 7);
 102         assert(sb.sputc('7') == '7');
 103         assert(sb.str() == "0123456789");
 104         assert(sb.pubseekoff(-3, std::ios_base::end, std::ios_base::out) == 7);
 105         assert(sb.sputc('c') == 'c');
 106         assert(sb.str() == "0123456c89");
 107     }
 108 #ifndef TEST_HAS_NO_WIDE_CHARACTERS
 109     {
 110         std::wstringbuf sb(L"0123456789", std::ios_base::in);
 111         assert(sb.pubseekoff(3, std::ios_base::beg, std::ios_base::out) == -1);
 112         assert(sb.pubseekoff(3, std::ios_base::cur, std::ios_base::out) == -1);
 113         assert(sb.pubseekoff(-3, std::ios_base::end, std::ios_base::out) == -1);
 114         assert(sb.pubseekoff(3, std::ios_base::beg, std::ios_base::in | std::ios_base::out) == -1);
 115         assert(sb.pubseekoff(3, std::ios_base::cur, std::ios_base::in | std::ios_base::out) == -1);
 116         assert(sb.pubseekoff(-3, std::ios_base::end, std::ios_base::in | std::ios_base::out) == -1);
 117         assert(sb.pubseekoff(3, std::ios_base::beg, std::ios_base::in) == 3);
 118         assert(sb.sgetc() == L'3');
 119         assert(sb.pubseekoff(3, std::ios_base::cur, std::ios_base::in) == 6);
 120         assert(sb.sgetc() == L'6');
 121         assert(sb.pubseekoff(-3, std::ios_base::end, std::ios_base::in) == 7);
 122         assert(sb.sgetc() == L'7');
 123     }
 124     {
 125         std::wstringbuf sb(L"0123456789", std::ios_base::out);
 126         assert(sb.pubseekoff(3, std::ios_base::beg, std::ios_base::in) == -1);
 127         assert(sb.pubseekoff(3, std::ios_base::cur, std::ios_base::in) == -1);
 128         assert(sb.pubseekoff(-3, std::ios_base::end, std::ios_base::in) == -1);
 129         assert(sb.pubseekoff(3, std::ios_base::beg, std::ios_base::out | std::ios_base::in) == -1);
 130         assert(sb.pubseekoff(3, std::ios_base::cur, std::ios_base::out | std::ios_base::in) == -1);
 131         assert(sb.pubseekoff(-3, std::ios_base::end, std::ios_base::out | std::ios_base::in) == -1);
 132         assert(sb.pubseekoff(3, std::ios_base::beg, std::ios_base::out) == 3);
 133         assert(sb.sputc(L'a') == L'a');
 134         assert(sb.str() == L"012a456789");
 135         assert(sb.pubseekoff(3, std::ios_base::cur, std::ios_base::out) == 7);
 136         assert(sb.sputc(L'b') == L'b');
 137         assert(sb.str() == L"012a456b89");
 138         assert(sb.pubseekoff(-3, std::ios_base::end, std::ios_base::out) == 7);
 139         assert(sb.sputc(L'c') == L'c');
 140         assert(sb.str() == L"012a456c89");
 141     }
 142     {
 143         std::wstringbuf sb(L"0123456789");
 144         assert(sb.pubseekoff(3, std::ios_base::beg, std::ios_base::in) == 3);
 145         assert(sb.sgetc() == L'3');
 146         assert(sb.pubseekoff(3, std::ios_base::cur, std::ios_base::in) == 6);
 147         assert(sb.sgetc() == L'6');
 148         assert(sb.pubseekoff(-3, std::ios_base::end, std::ios_base::in) == 7);
 149         assert(sb.sgetc() == L'7');
 150         assert(sb.pubseekoff(3, std::ios_base::beg, std::ios_base::out | std::ios_base::in) == 3);
 151         assert(sb.sgetc() == L'3');
 152         assert(sb.sputc(L'a') == L'a');
 153         assert(sb.str() == L"012a456789");
 154         assert(sb.pubseekoff(3, std::ios_base::cur, std::ios_base::out | std::ios_base::in) == -1);
 155         assert(sb.pubseekoff(-3, std::ios_base::end, std::ios_base::out | std::ios_base::in) == 7);
 156         assert(sb.sgetc() == L'7');
 157         assert(sb.sputc(L'c') == L'c');
 158         assert(sb.str() == L"012a456c89");
 159         assert(sb.pubseekoff(3, std::ios_base::beg, std::ios_base::out) == 3);
 160         assert(sb.sputc(L'3') == L'3');
 161         assert(sb.str() == L"0123456c89");
 162         assert(sb.pubseekoff(3, std::ios_base::cur, std::ios_base::out) == 7);
 163         assert(sb.sputc(L'7') == L'7');
 164         assert(sb.str() == L"0123456789");
 165         assert(sb.pubseekoff(-3, std::ios_base::end, std::ios_base::out) == 7);
 166         assert(sb.sputc(L'c') == L'c');
 167         assert(sb.str() == L"0123456c89");
 168     }
 169 #endif // TEST_HAS_NO_WIDE_CHARACTERS
 170
 171   return 0;
 172 }