1 //===----------------------------------------------------------------------===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is dual licensed under the MIT and the University of Illinois Open 6 // Source Licenses. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 10 // <strstream> 11 12 // class strstreambuf 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 <strstream> 18 #include <cassert> 19 20 int main() 21 { 22 { 23 char buf[] = "0123456789"; 24 std::strstreambuf sb(buf, 0); 25 assert(sb.pubseekoff(3, std::ios_base::beg, std::ios_base::out) == -1); 26 assert(sb.pubseekoff(3, std::ios_base::cur, std::ios_base::out) == -1); 27 assert(sb.pubseekoff(-3, std::ios_base::end, std::ios_base::out) == -1); 28 assert(sb.pubseekoff(3, std::ios_base::beg, std::ios_base::in | std::ios_base::out) == -1); 29 assert(sb.pubseekoff(3, std::ios_base::cur, std::ios_base::in | std::ios_base::out) == -1); 30 assert(sb.pubseekoff(-3, std::ios_base::end, std::ios_base::in | std::ios_base::out) == -1); 31 assert(sb.pubseekoff(3, std::ios_base::beg, std::ios_base::in) == 3); 32 assert(sb.sgetc() == '3'); 33 assert(sb.pubseekoff(3, std::ios_base::cur, std::ios_base::in) == 6); 34 assert(sb.sgetc() == '6'); 35 assert(sb.pubseekoff(-3, std::ios_base::end, std::ios_base::in) == 7); 36 assert(sb.sgetc() == '7'); 37 } 38 { 39 char buf[] = "0123456789"; 40 std::strstreambuf sb(buf, 0, buf); 41 assert(sb.pubseekoff(3, std::ios_base::beg, std::ios_base::in) == 3); 42 assert(sb.pubseekoff(3, std::ios_base::cur, std::ios_base::in) == 6); 43 assert(sb.pubseekoff(-3, std::ios_base::end, std::ios_base::in) == 7); 44 assert(sb.pubseekoff(3, std::ios_base::beg, std::ios_base::out | std::ios_base::in) == 3); 45 assert(sb.pubseekoff(3, std::ios_base::cur, std::ios_base::out | std::ios_base::in) == -1); 46 assert(sb.pubseekoff(-3, std::ios_base::end, std::ios_base::out | std::ios_base::in) == 7); 47 assert(sb.pubseekoff(3, std::ios_base::beg, std::ios_base::out) == 3); 48 assert(sb.sputc('a') == 'a'); 49 assert(sb.str() == std::string("012a456789")); 50 assert(sb.pubseekoff(3, std::ios_base::cur, std::ios_base::out) == 7); 51 assert(sb.sputc('b') == 'b'); 52 assert(sb.str() == std::string("012a456b89")); 53 assert(sb.pubseekoff(-3, std::ios_base::end, std::ios_base::out) == 7); 54 assert(sb.sputc('c') == 'c'); 55 assert(sb.str() == std::string("012a456c89")); 56 } 57 } 58
