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ctype.h
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C/C++ Source or Header
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1985-11-11
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2KB
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54 lines
/**
*
* This header file defines various ASCII character manipulation macros,
* as follows:
*
* isalpha(c) non-zero if c is alpha
* isupper(c) non-zero if c is upper case
* islower(c) non-zero if c is lower case
* isdigit(c) non-zero if c is a digit (0 to 9)
* isxdigit(c) non-zero if c is a hexadecimal digit (0 to 9, A to F,
* a to f)
* isspace(c) non-zero if c is white space
* ispunct(c) non-zero if c is punctuation
* isalnum(c) non-zero if c is alpha or digit
* isprint(c) non-zero if c is printable (including blank)
* isgraph(c) non-zero if c is graphic (excluding blank)
* iscntrl(c) non-zero if c is control character
* isascii(c) non-zero if c is ASCII
* iscsym(c) non-zero if valid character for C symbols
* iscsymf(c) non-zero if valid first character for C symbols
*
**/
#define _U 1 /* upper case flag */
#define _L 2 /* lower case flag */
#define _N 4 /* number flag */
#define _S 8 /* space flag */
#define _P 16 /* punctuation flag */
#define _C 32 /* control character flag */
#define _B 64 /* blank flag */
#define _X 128 /* hexadecimal flag */
extern char _ctype[]; /* character type table */
#define isalpha(c) (_ctype[(c)+1]&(_U|_L))
#define isupper(c) (_ctype[(c)+1]&_U)
#define islower(c) (_ctype[(c)+1]&_L)
#define isdigit(c) (_ctype[(c)+1]&_N)
#define isxdigit(c) (_ctype[(c)+1]&_X)
#define isspace(c) (_ctype[(c)+1]&_S)
#define ispunct(c) (_ctype[(c)+1]&_P)
#define isalnum(c) (_ctype[(c)+1]&(_U|_L|_N))
#define isprint(c) (_ctype[(c)+1]&(_P|_U|_L|_N|_B))
#define isgraph(c) (_ctype[(c)+1]&(_P|_U|_L|_N))
#define iscntrl(c) (_ctype[(c)+1]&_C)
#define isascii(c) ((unsigned)(c)<=127)
#define iscsym(c) (isalnum(c)||(((c)&127)==0x5f))
#define iscsymf(c) (isalpha(c)||(((c)&127)==0x5f))
#define toupper(c) (islower(c)?((c)-('a'-'A')):(c))
#define tolower(c) (isupper(c)?((c)+('a'-'A')):(c))
#define toascii(c) ((c)&127)