1 /*        $NetBSD: lctype.h,v 1.8 2023/04/16 20:46:17 nikita Exp $    */
2 
3 /*
4 ** Id: lctype.h
5 ** 'ctype' functions for Lua
6 ** See Copyright Notice in lua.h
7 */
8 
9 #ifndef lctype_h
10 #define lctype_h
11 
12 #include "lua.h"
13 
14 
15 /*
16 ** WARNING: the functions defined here do not necessarily correspond
17 ** to the similar functions in the standard C ctype.h. They are
18 ** optimized for the specific needs of Lua.
19 */
20 
21 #if !defined(LUA_USE_CTYPE)
22 
23 #if 'A' == 65 && '0' == 48
24 /* ASCII case: can use its own tables; faster and fixed */
25 #define LUA_USE_CTYPE         0
26 #else
27 /* must use standard C ctype */
28 #define LUA_USE_CTYPE         1
29 #endif
30 
31 #endif
32 
33 
34 #if !LUA_USE_CTYPE  /* { */
35 
36 #ifndef _KERNEL
37 #include <limits.h>
38 #endif /* _KERNEL */
39 
40 #include "llimits.h"
41 
42 
43 #define ALPHABIT    0
44 #define DIGITBIT    1
45 #define PRINTBIT    2
46 #define SPACEBIT    3
47 #define XDIGITBIT   4
48 
49 
50 #define MASK(B)               (1 << (B))
51 
52 
53 /*
54 ** add 1 to char to allow index -1 (EOZ)
55 */
56 #define testprop(c,p)         (luai_ctype_[(c)+1] & (p))
57 
58 /*
59 ** 'lalpha' (Lua alphabetic) and 'lalnum' (Lua alphanumeric) both include '_'
60 */
61 #define lislalpha(c)          testprop(c, MASK(ALPHABIT))
62 #define lislalnum(c)          testprop(c, (MASK(ALPHABIT) | MASK(DIGITBIT)))
63 #define lisdigit(c) testprop(c, MASK(DIGITBIT))
64 #define lisspace(c) testprop(c, MASK(SPACEBIT))
65 #define lisprint(c) testprop(c, MASK(PRINTBIT))
66 #define lisxdigit(c)          testprop(c, MASK(XDIGITBIT))
67 
68 
69 /*
70 ** In ASCII, this 'ltolower' is correct for alphabetic characters and
71 ** for '.'. That is enough for Lua needs. ('check_exp' ensures that
72 ** the character either is an upper-case letter or is unchanged by
73 ** the transformation, which holds for lower-case letters and '.'.)
74 */
75 #define ltolower(c)  \
76   check_exp(('A' <= (c) && (c) <= 'Z') || (c) == ((c) | ('A' ^ 'a')),  \
77             (c) | ('A' ^ 'a'))
78 
79 
80 /* one entry for each character and for -1 (EOZ) */
81 LUAI_DDEC(const lu_byte luai_ctype_[UCHAR_MAX + 2];)
82 
83 
84 #else                         /* }{ */
85 
86 /*
87 ** use standard C ctypes
88 */
89 
90 #include <ctype.h>
91 
92 
93 #define lislalpha(c)          (isalpha(c) || (c) == '_')
94 #define lislalnum(c)          (isalnum(c) || (c) == '_')
95 #define lisdigit(c) (isdigit(c))
96 #define lisspace(c) (isspace(c))
97 #define lisprint(c) (isprint(c))
98 #define lisxdigit(c)          (isxdigit(c))
99 
100 #define ltolower(c) (tolower(c))
101 
102 #endif                        /* } */
103 
104 #endif
105 
106