1 /*
2 **********************************************************************
3 * Copyright (c) 2001-2004, International Business Machines
4 * Corporation and others. All Rights Reserved.
5 **********************************************************************
6 * Date Name Description
7 * 11/19/2001 aliu Creation.
8 **********************************************************************
9 */
10
11 #ifndef CHARSTRING_H
12 #define CHARSTRING_H
13
14 #include "unicode/utypes.h"
15 #include "unicode/uobject.h"
16 #include "unicode/unistr.h"
17 #include "cmemory.h"
18
19 //--------------------------------------------------------------------
20 // class CharString
21 //
22 // This is a tiny wrapper class that is used internally to make a
23 // UnicodeString look like a const char*. It can be allocated on the
24 // stack. It only creates a heap buffer if it needs to.
25 //--------------------------------------------------------------------
26
27 U_NAMESPACE_BEGIN
28
29 class U_COMMON_API CharString : public UMemory {
30 public:
31
32 #if !UCONFIG_NO_CONVERSION
33 // Constructor
34 // @param str The unicode string to be converted to char *
35 // @param codepage The char * code page. "" for invariant conversion.
36 // NULL for default code page.
37 // inline CharString(const UnicodeString& str, const char *codepage);
38 #endif
39
40 inline CharString(const UnicodeString& str);
41 inline ~CharString();
42 inline operator const char*() const { return ptr; }
43
44 private:
45 char buf[128];
46 char* ptr;
47
48 CharString(const CharString &other); // forbid copying of this class
49 CharString &operator=(const CharString &other); // forbid copying of this class
50 };
51
52 #if !UCONFIG_NO_CONVERSION
53
54 // PLEASE DON'T USE THIS FUNCTION.
55 // We don't want the static dependency on conversion or the performance hit that comes from a codepage conversion.
56 /*
57 inline CharString::CharString(const UnicodeString& str, const char *codepage) {
58 int32_t len;
59 ptr = buf;
60 len = str.extract(0, 0x7FFFFFFF, buf ,sizeof(buf)-1, codepage);
61 if (len >= (int32_t)(sizeof(buf)-1)) {
62 ptr = (char *)uprv_malloc(len+1);
63 str.extract(0, 0x7FFFFFFF, ptr, len+1, codepage);
64 }
65 }*/
66
67 #endif
68
CharString(const UnicodeString & str)69 inline CharString::CharString(const UnicodeString& str) {
70 int32_t len;
71 ptr = buf;
72 len = str.extract(0, 0x7FFFFFFF, buf, (int32_t)(sizeof(buf)-1), US_INV);
73 if (len >= (int32_t)(sizeof(buf)-1)) {
74 ptr = (char *)uprv_malloc(len+1);
75 str.extract(0, 0x7FFFFFFF, ptr, len+1, US_INV);
76 }
77 }
78
~CharString()79 inline CharString::~CharString() {
80 if (ptr != buf) {
81 uprv_free(ptr);
82 }
83 }
84
85 U_NAMESPACE_END
86
87 #endif
88 //eof
89