1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/intl/icu/source/common/stringpiece.cpp Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,73 @@
1.4 +// Copyright (C) 2009-2013, International Business Machines
1.5 +// Corporation and others. All Rights Reserved.
1.6 +//
1.7 +// Copyright 2004 and onwards Google Inc.
1.8 +//
1.9 +// Author: wilsonh@google.com (Wilson Hsieh)
1.10 +//
1.11 +
1.12 +#include "unicode/utypes.h"
1.13 +#include "unicode/stringpiece.h"
1.14 +#include "cstring.h"
1.15 +#include "cmemory.h"
1.16 +
1.17 +U_NAMESPACE_BEGIN
1.18 +
1.19 +StringPiece::StringPiece(const char* str)
1.20 + : ptr_(str), length_((str == NULL) ? 0 : static_cast<int32_t>(uprv_strlen(str))) { }
1.21 +
1.22 +StringPiece::StringPiece(const StringPiece& x, int32_t pos) {
1.23 + if (pos < 0) {
1.24 + pos = 0;
1.25 + } else if (pos > x.length_) {
1.26 + pos = x.length_;
1.27 + }
1.28 + ptr_ = x.ptr_ + pos;
1.29 + length_ = x.length_ - pos;
1.30 +}
1.31 +
1.32 +StringPiece::StringPiece(const StringPiece& x, int32_t pos, int32_t len) {
1.33 + if (pos < 0) {
1.34 + pos = 0;
1.35 + } else if (pos > x.length_) {
1.36 + pos = x.length_;
1.37 + }
1.38 + if (len < 0) {
1.39 + len = 0;
1.40 + } else if (len > x.length_ - pos) {
1.41 + len = x.length_ - pos;
1.42 + }
1.43 + ptr_ = x.ptr_ + pos;
1.44 + length_ = len;
1.45 +}
1.46 +
1.47 +void StringPiece::set(const char* str) {
1.48 + ptr_ = str;
1.49 + if (str != NULL)
1.50 + length_ = static_cast<int32_t>(uprv_strlen(str));
1.51 + else
1.52 + length_ = 0;
1.53 +}
1.54 +
1.55 +U_EXPORT UBool U_EXPORT2
1.56 +operator==(const StringPiece& x, const StringPiece& y) {
1.57 + int32_t len = x.size();
1.58 + if (len != y.size()) {
1.59 + return false;
1.60 + }
1.61 + if (len == 0) {
1.62 + return true;
1.63 + }
1.64 + const char* p = x.data();
1.65 + const char* p2 = y.data();
1.66 + // Test last byte in case strings share large common prefix
1.67 + --len;
1.68 + if (p[len] != p2[len]) return false;
1.69 + // At this point we can, but don't have to, ignore the last byte.
1.70 + return uprv_memcmp(p, p2, len) == 0;
1.71 +}
1.72 +
1.73 +
1.74 +const int32_t StringPiece::npos = 0x7fffffff;
1.75 +
1.76 +U_NAMESPACE_END
