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@(#)isalnum.3 8.1 (Berkeley) 6/4/93
$FreeBSD: head/lib/libc/locale/isalnum.3 59180 2000-04-12 18:38:30Z ache $
.Dd June 4, 1993 .Dt ISALNUM 3 .Os .Sh NAME .Nm isalnum .Nd alphanumeric character test .Sh SYNOPSIS .Fd #include <ctype.h> .Ft int .Fn isalnum "int c" .Sh DESCRIPTION The .Fn isalnum function tests for any character for which .Xr isalpha 3 or .Xr isdigit 3 is true. For single C .Va char Ns s locales (see .Xr multibyte 3 ) the value of the argument is representable as an .Li unsigned char or the value of .Dv EOF . In the ASCII character set, this includes the following characters (with their numeric values shown in octal):
p 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 .Sh RETURN VALUES The .Fn isalnum function returns zero if the character tests false and returns non-zero if the character tests true. .Sh SEE ALSO .Xr ctype 3 , .Xr isalpha 3 , .Xr isdigit 3 , .Xr multibyte 3 , .Xr ascii 7 .Sh STANDARDS The .Fn isalnum function conforms to .St -ansiC .