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Plan 9 - man page for ctype (plan9 section 2)

CTYPE(2)			       System Calls Manual				 CTYPE(2)

NAME
       isalpha, isupper, islower, isdigit, isxdigit, isalnum, isspace, ispunct, isprint, isgraph,
       iscntrl, isascii, toascii, _toupper, _tolower, toupper, tolower - ASCII character  classi-
       fication

SYNOPSIS
       #include <u.h>
       #include <libc.h>
       #include <ctype.h>

       isalpha(c)

       isupper(c)

       islower(c)

       isdigit(c)

       isxdigit(c)

       isalnum(c)

       isspace(c)

       ispunct(c)

       isprint(c)

       isgraph(c)

       iscntrl(c)

       isascii(c)

       _toupper(c)

       _tolower(c)

       toupper(c)

       tolower(c)

       toascii(c)

DESCRIPTION
       These  macros  classify	ASCII-coded  integer values by table lookup.  Each is a predicate
       returning nonzero for true, zero for false.  Isascii is defined on all integer values; the
       rest  are  defined  only  where isascii is true and on the single non-ASCII value EOF; see
       fopen(2).

       isalpha	c is a letter, a-z or A-Z

       isupper	c is an upper case letter, A-Z

       islower	c is a lower case letter, a-z

       isdigit	c is a digit, 0-9

       isxdigit c is a hexadecimal digit, 0-9 or a-f or A-F

       isalnum	c is an alphanumeric character, a-z or A-Z or 0-9

       isspace	c is a space, horizontal tab, newline, vertical tab, formfeed, or carriage return
		(0x20, 0x9, 0xA, 0xB, 0xC, 0xD)

       ispunct	c is a punctuation character (one of !"#$%&'()*+,-./:;<=>?@[\]^_`{|}~)

       isprint	c is a printing character, 0x20 (space) through 0x7E (tilde)

       isgraph	c is a visible printing character, 0x21 (exclamation) through 0x7E (tilde)

       iscntrl	c is a delete character, 0x7F, or ordinary control character, 0x0 through 0x1F

       isascii	c is an ASCII character, 0x0 through 0x7F

       Toascii	is  not a classification macro; it converts its argument to ASCII range by anding
       with 0x7F.

       If c is an upper case letter, tolower returns the lower case  version  of  the  character;
       otherwise it returns the original character.  Toupper is similar, returning the upper case
       version of a character or the original character.   Tolower  and  toupper  are  functions;
       _tolower  and _toupper are corresponding macros which should only be used when it is known
       that the argument is upper case or lower case, respectively.

   Alef
       These routines are not provided in Alef.

SOURCE
       /sys/include/ctype.h
	      for the macros.

       /sys/src/libc/port/ctype.c
	      for the tables.

BUGS
       These macros are ASCII-centric.

											 CTYPE(2)


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