Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/include/ctype.h
Version:
- FREEBSD - FREEBSD-13-STABLE - FREEBSD-13-0 - FREEBSD-12-STABLE - FREEBSD-12-0 - FREEBSD-11-STABLE - FREEBSD-11-0 - FREEBSD-10-STABLE - FREEBSD-10-0 - FREEBSD-9-STABLE - FREEBSD-9-0 - FREEBSD-8-STABLE - FREEBSD-8-0 - FREEBSD-7-STABLE - FREEBSD-7-0 - FREEBSD-6-STABLE - FREEBSD-6-0 - FREEBSD-5-STABLE - FREEBSD-5-0 - FREEBSD-4-STABLE - FREEBSD-3-STABLE - FREEBSD22 - l41 - OPENBSD - linux-2.6 - MK84 - PLAN9 - xnu-8792
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1 /* The <ctype.h> header file defines some macros used to identify characters. 2 * It works by using a table stored in chartab.c. When a character is presented 3 * to one of these macros, the character is used as an index into the table 4 * (__ctype) to retrieve a byte. The relevant bit is then extracted. 5 */ 6 7 #ifndef _CTYPE_H 8 #define _CTYPE_H 9 10 #ifndef _ANSI_H 11 #include <ansi.h> 12 #endif 13 14 extern char __ctype[]; /* property array defined in chartab.c */ 15 16 #define _U 0x01 /* this bit is for upper-case letters [A-Z] */ 17 #define _L 0x02 /* this bit is for lower-case letters [a-z] */ 18 #define _N 0x04 /* this bit is for numbers [0-9] */ 19 #define _S 0x08 /* this bit is for white space \t \n \f etc */ 20 #define _P 0x10 /* this bit is for punctuation characters */ 21 #define _C 0x20 /* this bit is for control characters */ 22 #define _X 0x40 /* this bit is for hex digits [a-f] and [A-F]*/ 23 24 /* Function Prototypes (have to go before the macros). */ 25 _PROTOTYPE( int isalnum, (int _c) ); /* alphanumeric [a-z], [A-Z], [0-9] */ 26 _PROTOTYPE( int isalpha, (int _c) ); /* alphabetic */ 27 _PROTOTYPE( int iscntrl, (int _c) ); /* control characters */ 28 _PROTOTYPE( int isdigit, (int _c) ); /* digit [0-9] */ 29 _PROTOTYPE( int isgraph, (int _c) ); /* graphic character */ 30 _PROTOTYPE( int islower, (int _c) ); /* lower-case letter [a-z] */ 31 _PROTOTYPE( int isprint, (int _c) ); /* printable character */ 32 _PROTOTYPE( int ispunct, (int _c) ); /* punctuation mark */ 33 _PROTOTYPE( int isspace, (int _c) ); /* white space sp, \f, \n, \r, \t, \v*/ 34 _PROTOTYPE( int isupper, (int _c) ); /* upper-case letter [A-Z] */ 35 _PROTOTYPE( int isxdigit,(int _c) ); /* hex digit [0-9], [a-f], [A-F] */ 36 _PROTOTYPE( int tolower, (int _c) ); /* convert to lower-case */ 37 _PROTOTYPE( int toupper, (int _c) ); /* convert to upper-case */ 38 39 /* Macros for identifying character classes. */ 40 #define isalnum(c) ((__ctype+1)[c]&(_U|_L|_N)) 41 #define isalpha(c) ((__ctype+1)[c]&(_U|_L)) 42 #define iscntrl(c) ((__ctype+1)[c]&_C) 43 #define isgraph(c) ((__ctype+1)[c]&(_P|_U|_L|_N)) 44 #define ispunct(c) ((__ctype+1)[c]&_P) 45 #define isspace(c) ((__ctype+1)[c]&_S) 46 #define isxdigit(c) ((__ctype+1)[c]&(_N|_X)) 47 48 #define isdigit(c) ((unsigned) ((c)-'') < 10) 49 #define islower(c) ((unsigned) ((c)-'a') < 26) 50 #define isupper(c) ((unsigned) ((c)-'A') < 26) 51 #define isprint(c) ((unsigned) ((c)-' ') < 95) 52 #define isascii(c) ((unsigned) (c) < 128) 53 54 #endif /* _CTYPE_H */
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