intl/icu/source/common/stringpiece.cpp@6474c204b198
intl/icu/source/common/stringpiece.cpp
Wed, 31 Dec 2014 06:09:35 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Wed, 31 Dec 2014 06:09:35 +0100
- changeset 0
- 6474c204b198
- permissions
- -rw-r--r--
Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.
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 //
9 #include "unicode/utypes.h"
10 #include "unicode/stringpiece.h"
11 #include "cstring.h"
12 #include "cmemory.h"
14 U_NAMESPACE_BEGIN
16 StringPiece::StringPiece(const char* str)
17 : ptr_(str), length_((str == NULL) ? 0 : static_cast<int32_t>(uprv_strlen(str))) { }
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 }
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 }
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 }
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 }
71 const int32_t StringPiece::npos = 0x7fffffff;
73 U_NAMESPACE_END
