text: /*
  ** $Id: lctype.h,v 1.12.1.1 2013/04/12 18:48:47 roberto Exp $
  ** 'ctype' functions for Lua
  ** See Copyright Notice in lua.h
  */
  
  #ifndef lctype_h
  #define lctype_h
  
  #include "lua_base5.3/lua.h"
  
  
  /*
  ** WARNING: the functions defined here do not necessarily correspond
  ** to the similar functions in the standard C ctype.h. They are
  ** optimized for the specific needs of Lua
  */
  
  #if !defined(LUA_USE_CTYPE)
  
  #if 'A' == 65 && '0' == 48
  /* ASCII case: can use its own tables; faster and fixed */
  #define LUA_USE_CTYPE	0
  #else
  /* must use standard C ctype */
  #define LUA_USE_CTYPE	1
  #endif
  
  #endif
  
  
  #if !LUA_USE_CTYPE	/* { */
  
  #include <limits.h>
  
  #include "llimits.h"
  
  
  #define ALPHABIT	0
  #define DIGITBIT	1
  #define PRINTBIT	2
  #define SPACEBIT	3
  #define XDIGITBIT	4
  
  
  #define MASK(B)		(1 << (B))
  
  
  /*
  ** add 1 to char to allow index -1 (EOZ)
  */
  #define testprop(c,p)	(luai_ctype_[(c)+1] & (p))
  
  /*
  ** 'lalpha' (Lua alphabetic) and 'lalnum' (Lua alphanumeric) both include '_'
  */
  #define lislalpha(c)	testprop(c, MASK(ALPHABIT))
  #define lislalnum(c)	testprop(c, (MASK(ALPHABIT) | MASK(DIGITBIT)))
  #define lisdigit(c)	testprop(c, MASK(DIGITBIT))
  #define lisspace(c)	testprop(c, MASK(SPACEBIT))
  #define lisprint(c)	testprop(c, MASK(PRINTBIT))
  #define lisxdigit(c)	testprop(c, MASK(XDIGITBIT))
  
  /*
  ** this 'ltolower' only works for alphabetic characters
  */
  #define ltolower(c)	((c) | ('A' ^ 'a'))
  
  
  /* two more entries for 0 and -1 (EOZ) */
  LUAI_DDEC const lu_byte luai_ctype_[UCHAR_MAX + 2];
  
  
  #else			/* }{ */
  
  /*
  ** use standard C ctypes
  */
  
  #include <ctype.h>
  
  
  #define lislalpha(c)	(isalpha(c) || (c) == '_')
  #define lislalnum(c)	(isalnum(c) || (c) == '_')
  #define lisdigit(c)	(isdigit(c))
  #define lisspace(c)	(isspace(c))
  #define lisprint(c)	(isprint(c))
  #define lisxdigit(c)	(isxdigit(c))
  
  #define ltolower(c)	(tolower(c))
  
  #endif			/* } */
  
  #endif
  
  