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@(#)isalnum.3 8.1 (Berkeley) 6/4/93
$FreeBSD: head/lib/libc/locale/isalnum.3 232935 2012-03-13 20:02:41Z theraven $
.Dd July 17, 2005 .Dt ISALNUM 3 .Os .Sh NAME .Nm isalnum .Nd alphanumeric character test .Sh LIBRARY .Lb libc .Sh SYNOPSIS n ctype.h .Ft int .Fn isalnum "int c" .Ft int .Fn isalnum_l "int c" "locale_t loc" .Sh DESCRIPTION The .Fn isalnum function tests for any character for which .Xr isalpha 3 or .Xr isdigit 3 is true. The value of the argument must be representable as an .Vt "unsigned char" or the value of .Dv EOF .
p In the ASCII character set, this includes the following characters (with their numeric values shown in octal): l -column 000_``0''__ 000_``0''__ 000_``0''__ 000_``0''__ 000_``0''__ t "060 ``0'' \t061 ``1'' \t062 ``2'' \t063 ``3'' \t064 ``4''" t "065 ``5'' \t066 ``6'' \t067 ``7'' \t070 ``8'' \t071 ``9''" t "101 ``A'' \t102 ``B'' \t103 ``C'' \t104 ``D'' \t105 ``E''" t "106 ``F'' \t107 ``G'' \t110 ``H'' \t111 ``I'' \t112 ``J''" t "113 ``K'' \t114 ``L'' \t115 ``M'' \t116 ``N'' \t117 ``O''" t "120 ``P'' \t121 ``Q'' \t122 ``R'' \t123 ``S'' \t124 ``T''" t "125 ``U'' \t126 ``V'' \t127 ``W'' \t130 ``X'' \t131 ``Y''" t "132 ``Z'' \t141 ``a'' \t142 ``b'' \t143 ``c'' \t144 ``d''" t "145 ``e'' \t146 ``f'' \t147 ``g'' \t150 ``h'' \t151 ``i''" t "152 ``j'' \t153 ``k'' \t154 ``l'' \t155 ``m'' \t156 ``n''" t "157 ``o'' \t160 ``p'' \t161 ``q'' \t162 ``r'' \t163 ``s''" t "164 ``t'' \t165 ``u'' \t166 ``v'' \t167 ``w'' \t170 ``x''" t "171 ``y'' \t172 ``z''" .El
p The .Fn isalnum_l function takes an explicit locale argument, whereas the .Fn isalnum function uses the current global or per-thread locale. .Sh RETURN VALUES The .Fn isalnum function returns zero if the character tests false and returns non-zero if the character tests true. .Sh COMPATIBILITY The x 4.4 extension of accepting arguments outside of the range of the .Vt "unsigned char" type in locales with large character sets is considered obsolete and may not be supported in future releases. The .Fn iswalnum function should be used instead. .Sh SEE ALSO .Xr ctype 3 , .Xr isalpha 3 , .Xr isdigit 3 , .Xr iswalnum 3 , .Xr xlocale 3 , .Xr ascii 7 .Sh STANDARDS The .Fn isalnum function conforms to .St -isoC . The .Fn isalnum_l function conforms to .St -p1003.1-2008 .