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