ctype(3) [osx man page]

CTYPE(3)						   BSD Library Functions Manual 						  CTYPE(3)

NAME

     digittoint, isalnum, isalpha, isascii, isblank, iscntrl, isdigit, isgraph, ishexnumber, isideogram, islower, isnumber, isphonogram, isprint,
     ispunct, isrune, isspace, isspecial, isupper, isxdigit, toascii, tolower, toupper -- character classification macros

LIBRARY

     Standard C Library (libc, -lc)

SYNOPSIS

     #include <ctype.h>

     int
     digittoint(int c);

     int
     isalnum(int c);

     int
     isalpha(int c);

     int
     isascii(int c);

     int
     iscntrl(int c);

     int
     isdigit(int c);

     int
     isgraph(int c);

     int
     ishexnumber(int c);

     int
     isideogram(int c);

     int
     islower(int c);

     int
     isnumber(int c);

     int
     isphonogram(int c);

     int
     isspecial(int c);

     int
     isprint(int c);

     int
     ispunct(int c);

     int
     isrune(int c);

     int
     isspace(int c);

     int
     isupper(int c);

     int
     isxdigit(int c);

     int
     toascii(int c);

     int
     tolower(int c);

     int
     toupper(int c);

DESCRIPTION

     The above functions perform character tests and conversions on the integer c.  They are available as macros, defined in the include file
     <ctype.h>, or as true functions in the C library.	See the specific manual pages for more information.

     Extended locale versions of these functions are documented in ctype_l(3).	See xlocale(3) for more information.

SEE ALSO

     digittoint(3), isalnum(3), isalpha(3), isascii(3), isblank(3), iscntrl(3), isdigit(3), isgraph(3), isideogram(3), islower(3), isphonogram(3),
     isprint(3), ispunct(3), isrune(3), isspace(3), isspecial(3), isupper(3), isxdigit(3), toascii(3), tolower(3), toupper(3), wctype(3),
     ascii(7), ctype_l(3)

STANDARDS

     These functions, except for digittoint(), isascii(), ishexnumber(), isideogram(), isnumber(), isphonogram(), isrune(), isspecial() and
     toascii(), conform to ISO/IEC 9899:1990 (``ISO C90'').

BSD
								  March 30, 2004							       BSD

ISALPHA(3)						     Linux Programmer's Manual							ISALPHA(3)

NAME

       isalnum,  isalpha, isascii, isblank, iscntrl, isdigit, isgraph, islower, isprint, ispunct, isspace, isupper, isxdigit - character classifi-
       cation routines

SYNOPSIS

       #include <ctype.h>

       int isalnum(int c);
       int isalpha(int c);
       int isascii(int c);
       int isblank(int c);
       int iscntrl(int c);
       int isdigit(int c);
       int isgraph(int c);
       int islower(int c);
       int isprint(int c);
       int ispunct(int c);
       int isspace(int c);
       int isupper(int c);
       int isxdigit(int c);

DESCRIPTION

       These functions check whether c, which must have the value of an unsigned char or EOF, falls into a certain character  class  according	to
       the current locale.

       isalnum()
	      checks for an alphanumeric character; it is equivalent to (isalpha(c) || isdigit(c)).

       isalpha()
	      checks  for  an  alphabetic character; in the standard "C" locale, it is equivalent to (isupper(c) || islower(c)).  In some locales,
	      there may be additional characters for which isalpha() is true--letters which are neither upper case nor lower case.

       isascii()
	      checks whether c is a 7-bit unsigned char value that fits into the ASCII character set.  This function is a  BSD	extension  and	is
	      also an SVID extension.

       isblank()
	      checks for a blank character; that is, a space or a tab.	This function is a GNU extension.

       iscntrl()
	      checks for a control character.

       isdigit()
	      checks for a digit (0 through 9).

       isgraph()
	      checks for any printable character except space.

       islower()
	      checks for a lower-case character.

       isprint()
	      checks for any printable character including space.

       ispunct()
	      checks for any printable character which is not a space or an alphanumeric character.

       isspace()
	      checks  for  white-space	characters.   In the "C" and "POSIX" locales, these are: space, form-feed ('f'), newline ('
'), carriage
	      return ('
'), horizontal tab ('	'), and vertical tab ('v').

       isupper()
	      checks for an uppercase letter.

       isxdigit()
	      checks for a hexadecimal digits, i.e. one of 0 1 2 3 4 5 6 7 8 9 a b c d e f A B C D E F.

RETURN VALUE

       The values returned are nonzero if the character c falls into the tested class, and a zero value if not.

CONFORMING TO

       ANSI - C, BSD 4.3.  isascii() is a BSD extension and is also an SVID extension.	isblank() is a GNU extension.

NOTE

       The details of what characters belong into which class depend on the current locale.  For example, isupper() will  not  recognize  an  A  -
       umlaut as an uppercase letter in the default C locale.

SEE ALSO

       tolower(3), toupper(3), setlocale(3), ascii(7), locale(7)

GNU
								    1995-09-02								ISALPHA(3)