58 lines
2.5 KiB
C
58 lines
2.5 KiB
C
/* The <ctype.h> header file defines some macros used to identify characters.
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* It works by using a table stored in chartab.c. When a character is presented
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* to one of these macros, the character is used as an index into the table
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* (__ctype) to retrieve a byte. The relevant bit is then extracted.
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*/
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#ifndef _CTYPE_H
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#define _CTYPE_H
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#ifndef _ANSI_H
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#include <ansi.h>
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#endif
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extern char __ctype[]; /* property array defined in chartab.c */
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#define _U 0x01 /* this bit is for upper-case letters [A-Z] */
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#define _L 0x02 /* this bit is for lower-case letters [a-z] */
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#define _N 0x04 /* this bit is for numbers [0-9] */
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#define _S 0x08 /* this bit is for white space \t \n \f etc */
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#define _P 0x10 /* this bit is for punctuation characters */
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#define _C 0x20 /* this bit is for control characters */
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#define _X 0x40 /* this bit is for hex digits [a-f] and [A-F]*/
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/* Function Prototypes (have to go before the macros). */
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_PROTOTYPE( int isalnum, (int _c) ); /* alphanumeric [a-z], [A-Z], [0-9] */
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_PROTOTYPE( int isalpha, (int _c) ); /* alphabetic */
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_PROTOTYPE( int iscntrl, (int _c) ); /* control characters */
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_PROTOTYPE( int isdigit, (int _c) ); /* digit [0-9] */
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_PROTOTYPE( int isgraph, (int _c) ); /* graphic character */
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_PROTOTYPE( int islower, (int _c) ); /* lower-case letter [a-z] */
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_PROTOTYPE( int isprint, (int _c) ); /* printable character */
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_PROTOTYPE( int ispunct, (int _c) ); /* punctuation mark */
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_PROTOTYPE( int isspace, (int _c) ); /* white space sp, \f, \n, \r, \t, \v*/
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_PROTOTYPE( int isupper, (int _c) ); /* upper-case letter [A-Z] */
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_PROTOTYPE( int isxdigit,(int _c) ); /* hex digit [0-9], [a-f], [A-F] */
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_PROTOTYPE( int tolower, (int _c) ); /* convert to lower-case */
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_PROTOTYPE( int toupper, (int _c) ); /* convert to upper-case */
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_PROTOTYPE( int toascii, (int _c) ); /* convert to 7-bit ASCII */
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/* Macros for identifying character classes. */
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#define isalnum(c) ((__ctype+1)[c]&(_U|_L|_N))
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#define isalpha(c) ((__ctype+1)[c]&(_U|_L))
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#define iscntrl(c) ((__ctype+1)[c]&_C)
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#define isgraph(c) ((__ctype+1)[c]&(_P|_U|_L|_N))
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#define ispunct(c) ((__ctype+1)[c]&_P)
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#define isspace(c) ((__ctype+1)[c]&_S)
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#define isxdigit(c) ((__ctype+1)[c]&(_N|_X))
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#define isdigit(c) ((unsigned) ((c)-'0') < 10)
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#define islower(c) ((unsigned) ((c)-'a') < 26)
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#define isupper(c) ((unsigned) ((c)-'A') < 26)
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#define isprint(c) ((unsigned) ((c)-' ') < 95)
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#define isascii(c) ((unsigned) (c) < 128)
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#define toascii(c) ((c) & 0x7f)
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#endif /* _CTYPE_H */
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