NAME    [Toc]    [Back]

     isalnum -- alphanumeric character test

LIBRARY    [Toc]    [Back]

     Standard C Library (libc, -lc)

SYNOPSIS    [Toc]    [Back]

     #include <ctype.h>

     int
     isalnum(int c);

DESCRIPTION    [Toc]    [Back]

     The isalnum() function tests for any character for which isalpha(3) or
     isdigit(3) is true.  For single C chars locales (see multibyte(3)) the
     value of the argument is representable as an unsigned char or the value
     of EOF.  In the ASCII character set, this includes the following characters
 (with their numeric values shown in octal):

     060 ``0''	   061 ``1''	 062 ``2''     063 ``3''     064 ``4''
     065 ``5''	   066 ``6''	 067 ``7''     070 ``8''     071 ``9''
     101 ``A''	   102 ``B''	 103 ``C''     104 ``D''     105 ``E''
     106 ``F''	   107 ``G''	 110 ``H''     111 ``I''     112 ``J''
     113 ``K''	   114 ``L''	 115 ``M''     116 ``N''     117 ``O''
     120 ``P''	   121 ``Q''	 122 ``R''     123 ``S''     124 ``T''
     125 ``U''	   126 ``V''	 127 ``W''     130 ``X''     131 ``Y''
     132 ``Z''	   141 ``a''	 142 ``b''     143 ``c''     144 ``d''
     145 ``e''	   146 ``f''	 147 ``g''     150 ``h''     151 ``i''
     152 ``j''	   153 ``k''	 154 ``l''     155 ``m''     156 ``n''
     157 ``o''	   160 ``p''	 161 ``q''     162 ``r''     163 ``s''
     164 ``t''	   165 ``u''	 166 ``v''     167 ``w''     170 ``x''
     171 ``y''	   172 ``z''

RETURN VALUES    [Toc]    [Back]

     The isalnum() function returns zero if the character tests false and
     returns non-zero if the character tests true.

COMPATIBILITY    [Toc]    [Back]

     Although isalnum() accepts arguments outside of the range of the unsigned
     char type in locales with large character sets, this is a 4.4BSD extension
 and the iswalnum() function should be used instead for maximum
     portability.

SEE ALSO    [Toc]    [Back]

     ctype(3), isalpha(3), isdigit(3), iswalnum(3), multibyte(3), ascii(7)

STANDARDS    [Toc]    [Back]

     The isalnum() function conforms to ISO/IEC 9899:1990 (``ISO C89'').


FreeBSD 5.2.1			October 6, 2002 		 FreeBSD 5.2.1