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isalnum(3)

NAME

     isalnum -- alphanumeric character test

LIBRARY

     Standard C Library (libc, -lc)

SYNOPSIS

     #include <ctype.h>

     int
     isalnum(int c);

DESCRIPTION

     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 charac-
     ters (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

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

COMPATIBILITY

     The 4.4BSD extension of accepting arguments outside of the range of the
     unsigned char type in locales with large character sets is deprecated.
     The iswalnum() function should be used instead for maximum portability.

SEE ALSO

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

STANDARDS

     The isalnum() function conforms to ISO/IEC 9899:1990 (``ISO C90'').

FreeBSD 5.4			 July 30, 2004			   FreeBSD 5.4

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