| 1 | /* The <ctype.h> header file defines some macros used to identify characters.
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| 2 | * It works by using a table stored in chartab.c. When a character is presented
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| 3 | * to one of these macros, the character is used as an index into the table
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| 4 | * (__ctype) to retrieve a byte. The relevant bit is then extracted.
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| 5 | */
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| 6 |
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| 7 | #ifndef _CTYPE_H
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| 8 | #define _CTYPE_H
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| 9 |
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| 10 | #ifndef _ANSI_H
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| 11 | #include <ansi.h>
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| 12 | #endif
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| 13 |
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| 14 | extern char __ctype[]; /* property array defined in chartab.c */
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| 15 |
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| 16 | #define _U 0x01 /* this bit is for upper-case letters [A-Z] */
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| 17 | #define _L 0x02 /* this bit is for lower-case letters [a-z] */
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| 18 | #define _N 0x04 /* this bit is for numbers [0-9] */
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| 19 | #define _S 0x08 /* this bit is for white space \t \n \f etc */
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| 20 | #define _P 0x10 /* this bit is for punctuation characters */
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| 21 | #define _C 0x20 /* this bit is for control characters */
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| 22 | #define _X 0x40 /* this bit is for hex digits [a-f] and [A-F]*/
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| 23 |
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| 24 | /* Function Prototypes (have to go before the macros). */
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| 25 | _PROTOTYPE( int isalnum, (int _c) ); /* alphanumeric [a-z], [A-Z], [0-9] */
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| 26 | _PROTOTYPE( int isalpha, (int _c) ); /* alphabetic */
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| 27 | _PROTOTYPE( int iscntrl, (int _c) ); /* control characters */
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| 28 | _PROTOTYPE( int isdigit, (int _c) ); /* digit [0-9] */
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| 29 | _PROTOTYPE( int isgraph, (int _c) ); /* graphic character */
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| 30 | _PROTOTYPE( int islower, (int _c) ); /* lower-case letter [a-z] */
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| 31 | _PROTOTYPE( int isprint, (int _c) ); /* printable character */
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| 32 | _PROTOTYPE( int ispunct, (int _c) ); /* punctuation mark */
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| 33 | _PROTOTYPE( int isspace, (int _c) ); /* white space sp, \f, \n, \r, \t, \v*/
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| 34 | _PROTOTYPE( int isupper, (int _c) ); /* upper-case letter [A-Z] */
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| 35 | _PROTOTYPE( int isxdigit,(int _c) ); /* hex digit [0-9], [a-f], [A-F] */
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| 36 | _PROTOTYPE( int tolower, (int _c) ); /* convert to lower-case */
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| 37 | _PROTOTYPE( int toupper, (int _c) ); /* convert to upper-case */
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| 38 |
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| 39 | /* Macros for identifying character classes. */
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| 40 | #define isalnum(c) ((__ctype+1)[c]&(_U|_L|_N))
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| 41 | #define isalpha(c) ((__ctype+1)[c]&(_U|_L))
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| 42 | #define iscntrl(c) ((__ctype+1)[c]&_C)
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| 43 | #define isgraph(c) ((__ctype+1)[c]&(_P|_U|_L|_N))
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| 44 | #define ispunct(c) ((__ctype+1)[c]&_P)
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| 45 | #define isspace(c) ((__ctype+1)[c]&_S)
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| 46 | #define isxdigit(c) ((__ctype+1)[c]&(_N|_X))
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| 47 |
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| 48 | #define isdigit(c) ((unsigned) ((c)-'0') < 10)
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| 49 | #define islower(c) ((unsigned) ((c)-'a') < 26)
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| 50 | #define isupper(c) ((unsigned) ((c)-'A') < 26)
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| 51 | #define isprint(c) ((unsigned) ((c)-' ') < 95)
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| 52 | #define isascii(c) ((unsigned) (c) < 128)
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| 53 |
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| 54 | #endif /* _CTYPE_H */
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