projects / apple / icu.git / blame
| Commit | Line | Data |
|---|---|---|
| 729e4ab9 A |
1 | // Copyright (C) 2009-2010, International Business Machines |
| 2 | // Corporation and others. All Rights Reserved. | |
| 3 | // | |
| 4 | // Copyright 2004 and onwards Google Inc. | |
| 5 | // | |
| 6 | // Author: wilsonh@google.com (Wilson Hsieh) | |
| 7 | // | |
| 8 | ||
| 9 | #include "unicode/utypes.h" | |
| 10 | #include "unicode/stringpiece.h" | |
| 11 | #include "cstring.h" | |
| 12 | #include "cmemory.h" | |
| 13 | ||
| 14 | U_NAMESPACE_BEGIN | |
| 15 | ||
| 16 | StringPiece::StringPiece(const char* str) | |
| 17 | : ptr_(str), length_((str == NULL) ? 0 : static_cast<int32_t>(uprv_strlen(str))) { } | |
| 18 | ||
| 19 | StringPiece::StringPiece(const StringPiece& x, int32_t pos) { | |
| 20 | if (pos < 0) { | |
| 21 | pos = 0; | |
| 22 | } else if (pos > x.length_) { | |
| 23 | pos = x.length_; | |
| 24 | } | |
| 25 | ptr_ = x.ptr_ + pos; | |
| 26 | length_ = x.length_ - pos; | |
| 27 | } | |
| 28 | ||
| 29 | StringPiece::StringPiece(const StringPiece& x, int32_t pos, int32_t len) { | |
| 30 | if (pos < 0) { | |
| 31 | pos = 0; | |
| 32 | } else if (pos > x.length_) { | |
| 33 | pos = x.length_; | |
| 34 | } | |
| 35 | if (len < 0) { | |
| 36 | len = 0; | |
| 37 | } else if (len > x.length_ - pos) { | |
| 38 | len = x.length_ - pos; | |
| 39 | } | |
| 40 | ptr_ = x.ptr_ + pos; | |
| 41 | length_ = len; | |
| 42 | } | |
| 43 | ||
| 44 | void StringPiece::set(const char* str) { | |
| 45 | ptr_ = str; | |
| 46 | if (str != NULL) | |
| 47 | length_ = static_cast<int32_t>(uprv_strlen(str)); | |
| 48 | else | |
| 49 | length_ = 0; | |
| 50 | } | |
| 51 | ||
| 52 | U_EXPORT UBool U_EXPORT2 | |
| 53 | operator==(const StringPiece& x, const StringPiece& y) { | |
| 54 | int32_t len = x.size(); | |
| 55 | if (len != y.size()) { | |
| 56 | return false; | |
| 57 | } | |
| 58 | if (len == 0) { | |
| 59 | return true; | |
| 60 | } | |
| 61 | const char* p = x.data(); | |
| 62 | const char* p2 = y.data(); | |
| 63 | // Test last byte in case strings share large common prefix | |
| 64 | --len; | |
| 65 | if (p[len] != p2[len]) return false; | |
| 66 | // At this point we can, but don't have to, ignore the last byte. | |
| 67 | return uprv_memcmp(p, p2, len) == 0; | |
| 68 | } | |
| 69 | ||
| 70 | ||
| 71 | /* Microsft Visual Studios <= 8.0 complains about redefinition of this | |
| 72 | * static const class variable. However, the C++ standard states that this | |
| 73 | * definition is correct. Perhaps there is a bug in the Microsoft compiler. | |
| 74 | * This is not an issue on any other compilers (that we know of) including | |
| 75 | * Visual Studios 9.0. | |
| 76 | * Cygwin with MSVC 9.0 also complains here about redefinition. | |
| 77 | */ | |
| 78 | #if (!defined(_MSC_VER) || (_MSC_VER > 1500)) && !defined(CYGWINMSVC) | |
| 79 | const int32_t StringPiece::npos; | |
| 80 | #endif | |
| 81 | ||
| 82 | U_NAMESPACE_END |