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ISALNUM(3)            DragonFly Library Functions Manual            ISALNUM(3)


NAME

     isalnum, isalnum_l -- alphanumeric character test


LIBRARY

     Standard C Library (libc, -lc)


SYNOPSIS

     #include <ctype.h>

     int
     isalnum(int c);

     int
     isalnum_l(int c, locale_t locale);


DESCRIPTION

     The isalnum() and isalnum_l() functions test for any character for which
     isalpha(3) or isdigit(3) is true.  The value of the argument must be
     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''

     The isalnum_l() function takes an explicit locale argument, whereas the
     isalnum() function uses the current global or per-thread locale.


RETURN VALUES

     The isalnum() and isalnum_l() functions return 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 considered
     obsolete and may not be supported in future releases.  The iswalnum() and
     iswalnum_l() functions should be used instead.


SEE ALSO

     ctype(3), ctype_l(3), isalpha(3), isdigit(3), iswalnum(3), iswalnum_l(3),
     xlocale(3), ascii(7)


STANDARDS

     The isalnum() function conforms to ISO/IEC 9899:1990 (``ISO C90'').  The
     isalnum_l() function conforms to IEEE Std 1003.1-2008 (``POSIX.1'').

DragonFly 4.3                  December 25, 2013                 DragonFly 4.3

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