The Tor Browser / file comparison
comparison: intl/icu/source/common/stringpiece.cpp
intl/icu/source/common/stringpiece.cpp
- branch
- TOR_BUG_3246
- changeset 4
- fc2d59ddac77
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| -1:000000000000 | 0:6ff52a854489 |
|---|---|
| 1 // Copyright (C) 2009-2013, 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 const int32_t StringPiece::npos = 0x7fffffff; | |
| 72 | |
| 73 U_NAMESPACE_END |
