1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
|
#ifndef UTF8_UTIL_H
#define UTF8_UTIL_H
#ifdef __cplusplus
extern "C" {
#endif
/**
* UTF-8 utility functions
*
* (c) 2010 Steve Bennett <steveb@workware.net.au>
*
* See LICENCE for licence details.
*/
#include <jim-config.h>
/* Currently we support unicode points up to 2^22-1 */
#define MAX_UTF8_LEN 4
/**
* Converts the given unicode codepoint (0 - 0x1fffff) to utf-8
* and stores the result at 'p'.
*
* Returns the number of utf-8 characters (up to MAX_UTF8_LEN).
*/
int utf8_fromunicode(char *p, unsigned uc);
#ifndef JIM_UTF8
#include <ctype.h>
/* No utf-8 support. 1 byte = 1 char */
#define utf8_strlen(S, B) ((B) < 0 ? strlen(S) : (B))
#define utf8_tounicode(S, CP) (*(CP) = (unsigned char)*(S), 1)
#define utf8_getchars(CP, C) (*(CP) = (C), 1)
#define utf8_upper(C) toupper(C)
#define utf8_title(C) toupper(C)
#define utf8_lower(C) tolower(C)
#define utf8_index(C, I) (I)
#define utf8_charlen(C) 1
#define utf8_prev_len(S, L) 1
#else
#if !defined(JIM_BOOTSTRAP)
#define utf8_getchars utf8_fromunicode
/**
* Returns the length of the utf-8 sequence starting with 'c'.
*
* Returns 1-4, or -1 if this is not a valid start byte.
*
* Note that charlen=4 is not supported by the rest of the API.
*/
int utf8_charlen(int c);
/**
* Returns the number of characters in the utf-8
* string of the given byte length.
*
* Any bytes which are not part of an valid utf-8
* sequence are treated as individual characters.
*
* The string *must* be null terminated.
*
* Does not support unicode code points > \u1fffff
*/
int utf8_strlen(const char *str, int bytelen);
/**
* Returns the byte index of the given character in the utf-8 string.
*
* The string *must* be null terminated.
*
* This will return the byte length of a utf-8 string
* if given the char length.
*/
int utf8_index(const char *str, int charindex);
/**
* Returns the unicode codepoint corresponding to the
* utf-8 sequence 'str'.
*
* Stores the result in *uc and returns the number of bytes
* consumed.
*
* If 'str' is null terminated, then an invalid utf-8 sequence
* at the end of the string will be returned as individual bytes.
*
* If it is not null terminated, the length *must* be checked first.
*
* Does not support unicode code points > \u1fffff
*/
int utf8_tounicode(const char *str, int *uc);
/**
* Returns the number of bytes before 'str' that the previous
* utf-8 character sequence starts (which may be the middle of a sequence).
*
* Looks back at most 'len' bytes backwards, which must be > 0.
* If no start char is found, returns -len
*/
int utf8_prev_len(const char *str, int len);
/**
* Returns the upper-case variant of the given unicode codepoint.
*
* Unicode code points > \uffff are returned unchanged.
*/
int utf8_upper(int uc);
/**
* Returns the title-case variant of the given unicode codepoint.
*
* If none, returns utf8_upper().
*
* Unicode code points > \uffff are returned unchanged.
*/
int utf8_title(int uc);
/**
* Returns the lower-case variant of the given unicode codepoint.
*
* NOTE: Use utf8_upper() in preference for case-insensitive matching.
*
* Unicode code points > \uffff are returned unchanged.
*/
int utf8_lower(int uc);
#endif /* JIM_BOOTSTRAP */
#endif
#ifdef __cplusplus
}
#endif
#endif
|
