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// Copyright (C) 2009-2012, International Business Machines
// Corporation and others. All Rights Reserved.
//
// Copyright 2004 and onwards Google Inc.
//
// Author: wilsonh@google.com (Wilson Hsieh)
//
#include "unicode/utypes.h"
#include "unicode/stringpiece.h"
#include "cstring.h"
#include "cmemory.h"
U_NAMESPACE_BEGIN
StringPiece::StringPiece(const char* str)
: ptr_(str), length_((str == NULL) ? 0 : static_cast<int32_t>(uprv_strlen(str))) { }
StringPiece::StringPiece(const StringPiece& x, int32_t pos) {
if (pos < 0) {
pos = 0;
} else if (pos > x.length_) {
pos = x.length_;
}
ptr_ = x.ptr_ + pos;
length_ = x.length_ - pos;
}
StringPiece::StringPiece(const StringPiece& x, int32_t pos, int32_t len) {
if (pos < 0) {
pos = 0;
} else if (pos > x.length_) {
pos = x.length_;
}
if (len < 0) {
len = 0;
} else if (len > x.length_ - pos) {
len = x.length_ - pos;
}
ptr_ = x.ptr_ + pos;
length_ = len;
}
void StringPiece::set(const char* str) {
ptr_ = str;
if (str != NULL)
length_ = static_cast<int32_t>(uprv_strlen(str));
else
length_ = 0;
}
U_EXPORT UBool U_EXPORT2
operator==(const StringPiece& x, const StringPiece& y) {
int32_t len = x.size();
if (len != y.size()) {
return false;
}
if (len == 0) {
return true;
}
const char* p = x.data();
const char* p2 = y.data();
// Test last byte in case strings share large common prefix
--len;
if (p[len] != p2[len]) return false;
// At this point we can, but don't have to, ignore the last byte.
return uprv_memcmp(p, p2, len) == 0;
}
/* Microsft Visual Studios <= 8.0 complains about redefinition of this
* static const class variable. However, the C++ standard states that this
* definition is correct. Perhaps there is a bug in the Microsoft compiler.
* This is not an issue on any other compilers (that we know of) including
* Visual Studios 9.0.
* Cygwin with MSVC 9.0 also complains here about redefinition.
*/
#if (!defined(_MSC_VER) || (_MSC_VER >= 1500)) && !defined(CYGWINMSVC)
const int32_t StringPiece::npos;
#endif
U_NAMESPACE_END