You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
65 lines
2.8 KiB
65 lines
2.8 KiB
3 months ago
|
/*
|
||
|
|
* UCW Library -- Character Types
|
||
|
|
*
|
||
|
|
* (c) 1997--2004 Martin Mares <mj@ucw.cz>
|
||
|
|
*
|
||
|
|
* This software may be freely distributed and used according to the terms
|
||
|
|
* of the GNU Lesser General Public License.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#ifndef _UCW_CHARTYPE_H
|
||
|
|
#define _UCW_CHARTYPE_H
|
||
|
|
|
||
|
|
/***
|
||
|
|
* We define our own routines to classify 8-bit characters (based on US-ASCII charset).
|
||
|
|
* This way we bypass most possible problems with different compilation environments.
|
||
|
|
*
|
||
|
|
* All functions and macros accept any numbers and if it is necessary, they simply ignore higher bits.
|
||
|
|
* It does not matter whether a parameter is signed or uintigned. Parameters are evaluated exactly once,
|
||
|
|
* so they can have side-effects.
|
||
|
|
***/
|
||
|
|
|
||
|
|
#define _C_UPPER 1 /* Upper-case letters */
|
||
|
|
#define _C_LOWER 2 /* Lower-case letters */
|
||
|
|
#define _C_PRINT 4 /* Printable */
|
||
|
|
#define _C_DIGIT 8 /* Digits */
|
||
|
|
#define _C_CTRL 16 /* Control characters */
|
||
|
|
#define _C_XDIGIT 32 /* Hexadecimal digits */
|
||
|
|
#define _C_BLANK 64 /* White spaces (spaces, tabs, newlines) */
|
||
|
|
#define _C_INNER 128 /* `inner punctuation' -- underscore etc. */
|
||
|
|
|
||
|
|
#define _C_ALPHA (_C_UPPER | _C_LOWER)
|
||
|
|
#define _C_ALNUM (_C_ALPHA | _C_DIGIT)
|
||
|
|
#define _C_WORD (_C_ALNUM | _C_INNER)
|
||
|
|
#define _C_WSTART (_C_ALPHA | _C_INNER)
|
||
|
|
|
||
|
|
extern const byte ucw_c_cat[256], ucw_c_upper[256], ucw_c_lower[256];
|
||
|
|
|
||
|
|
#define Category(x) (ucw_c_cat[(byte)(x)])
|
||
|
|
#define Ccat(x,y) (Category(x) & y)
|
||
|
|
|
||
|
|
#define Cupper(x) Ccat(x, _C_UPPER) /** Checks for an upper-case character (`A-Z`). **/
|
||
|
|
#define Clower(x) Ccat(x, _C_LOWER) /** Checks for a lower-case character (`a-z`). **/
|
||
|
|
#define Calpha(x) Ccat(x, _C_ALPHA) /** Checks for an alphabetic character (`a-z`, `A-Z`). **/
|
||
|
|
#define Calnum(x) Ccat(x, _C_ALNUM) /** Checks for an alpha-numeric character (`a-z`, `A-Z`, `0-9`). */
|
||
|
|
#define Cprint(x) Ccat(x, _C_PRINT) /** Checks for printable characters, including 8-bit values (`\t`, `0x20-0x7E`, `0x80-0xFF`). **/
|
||
|
|
#define Cdigit(x) Ccat(x, _C_DIGIT) /** Checks for a digit (`0-9`). **/
|
||
|
|
#define Cxdigit(x) Ccat(x, _C_XDIGIT) /** Checks for a hexadecimal digit (`0-9`, `a-f`, `A-F`). **/
|
||
|
|
#define Cword(x) Ccat(x, _C_WORD) /** Checks for an alpha-numeric character or an inner punctation (`a-z`, `A-Z`, `0-9`, `_`). **/
|
||
|
|
#define Cblank(x) Ccat(x, _C_BLANK) /** Checks for a white space (`0x20`, `\t`, `\n`, `\r`, `0x8`, `0xC`). **/
|
||
|
|
#define Cctrl(x) Ccat(x, _C_CTRL) /** Checks for control characters (`0x0-0x1F`, `0x7F`). **/
|
||
|
|
#define Cspace(x) Cblank(x)
|
||
|
|
|
||
|
|
#define Cupcase(x) (ucw_c_upper[(byte)(x)]) /** Convert a letter to upper case, leave non-letter characters unchanged. **/
|
||
|
|
#define Clocase(x) (ucw_c_lower[(byte)(x)]) /** Convert a letter to lower case, leave non-letter characters unchanged. **/
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Compute the value of a valid hexadecimal character (ie. passed the @Cxdigit() check).
|
||
|
|
**/
|
||
|
|
static inline uint Cxvalue(byte x)
|
||
|
|
{
|
||
|
|
return (x < (uint)'A') ? x - '0' : (x & 0xdf) - 'A' + 10;
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif
|