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      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