Category : C Source Code
Archive   : ECSTR.ZIP
Filename : CTYPES.H

Output of file : CTYPES.H contained in archive : ECSTR.ZIP
/* File : ctypes.h
Author : Richard A. O'Keefe.
Updated: 26 April 1984
Purpose: Reimplement the UNIX ctype(3) library.

isaneol(c) means that c is a line terminating character.
isalnum, ispunct, isspace, and isaneol are defined on the
range -1..127, i.e. on ASCII U {EOF}, while all the other
macros are defined for any integer.

isodigit(c) checks for Octal digits.
isxdigit(c) checkx for heXadecimal digits.

#define isdigit(c) ((unsigned)((c)-'0') < 10)
#define islower(c) ((unsigned)((c)-'a') < 26)
#define isupper(c) ((unsigned)((c)-'A') < 26)
#define isprint(c) ((unsigned)((c)-' ') < 95)
#define iscntrl(c) ((unsigned)((c)-' ') >= 95)
#define isascii(c) ((unsigned)(c) < 128)
#define isalpha(c) ((unsigned)(((c)|32)-'a') < 26)

extern char _c2type[];

#define isalnum(c) (_c2type[(c)+1] < 36)
#define ispunct(c) (_c2type[(c)+1] == 36)
#define isspace(c) (_c2type[(c)+1] > 37)
#define isaneol(c) (_c2type[(c)+1] > 38)

#define isxdigit(c) (_c2type[(c)+1] < 16)
#define isodigit(c) ((unsigned)((c)-'0') < 8)

/* The following "conversion" macros have been in some versions of UNIX
but are not in all. tocntrl is new. The original motivation for ^?
being a name for DEL was that (x)^64 mapped A..Z to ^A..^Z and also
? to DEL. The trouble is that this trick doesn't work for lower case
letters. The version given here is not mine. I wish it was. It has
the nice property that DEL is mapped to itself (so does EOF).
tolower(c) and toupper(c) are only defined when isalpha(c).
#define tolower(c) ((c)|32)
#define toupper(c) ((c)&~32)
#define tocntrl(c) (((((c)+1)&~96)-1)&127)
#define toascii(c) ((c)&127)

  3 Responses to “Category : C Source Code
Archive   : ECSTR.ZIP
Filename : CTYPES.H

  1. Very nice! Thank you for this wonderful archive. I wonder why I found it only now. Long live the BBS file archives!

  2. This is so awesome! 😀 I’d be cool if you could download an entire archive of this at once, though.

  3. But one thing that puzzles me is the “mtswslnkmcjklsdlsbdmMICROSOFT” string. There is an article about it here. It is definitely worth a read: