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

NAME
       isalnum, isalpha, isascii, isblank, iscntrl, isdigit, isgraph, islower,
       isprint, ispunct, isspace, isupper, isxdigit - character classification
       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 (isal‐
	      pha(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.

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

       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  ('\n'),
	      carriage	return ('\r'), horizontal tab ('\t'), 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 non-zero if the	character  c  falls  into  the
       tested class, and a zero value if not.

CONFORMING TO
       C99,  4.3BSD.   isascii() is a BSD extension and is also an SVr4 exten‐
       sion.  isblank() conforms to POSIX.1-2001 and C99 7.4.1.3.

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

SEE ALSO
       iswalnum(3), iswalpha(3), iswblank(3), iswcntrl(3),  iswdigit(3),  isw‐
       graph(3),  iswlower(3),	iswprint(3),  iswpunct(3), iswspace(3), iswup‐
       per(3), iswxdigit(3), setlocale(3), tolower(3),	toupper(3),  ascii(7),
       locale(7)

GNU				  1995-09-02			    ISALPHA(3)
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