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36 .\" @(#)isalnum.3 8.1 (Berkeley) 6/4/93
37 .\" $FreeBSD: src/lib/libc/locale/isalnum.3,v 1.17 2002/10/06 10:15:38 tjr Exp $
38 .\"
39 .Dd October 6, 2002
40 .Dt ISALNUM 3
41 .Os
42 .Sh NAME
43 .Nm isalnum
44 .Nd alphanumeric character test
45 .Sh LIBRARY
46 .Lb libc
47 .Sh SYNOPSIS
48 .In ctype.h
49 .Ft int
50 .Fn isalnum "int c"
51 .Sh DESCRIPTION
52 The
53 .Fn isalnum
54 function tests for any character for which
55 .Xr isalpha 3
56 or
57 .Xr isdigit 3
58 is true.
59 For single C
60 .Va char Ns s
61 locales (see
62 .Xr multibyte 3 )
63 the value of the argument is
64 representable as an
65 .Li unsigned char
66 or the value of
67 .Dv EOF .
68 In the ASCII character set, this includes the following characters
69 (with their numeric values shown in octal):
70 .Pp
71 .Bl -column \&000_``0''__ \&000_``0''__ \&000_``0''__ \&000_``0''__ \&000_``0''__
72 .It "\&060\ ``0'' \t061\ ``1'' \t062\ ``2'' \t063\ ``3'' \t064\ ``4''"
73 .It "\&065\ ``5'' \t066\ ``6'' \t067\ ``7'' \t070\ ``8'' \t071\ ``9''"
74 .It "\&101\ ``A'' \t102\ ``B'' \t103\ ``C'' \t104\ ``D'' \t105\ ``E''"
75 .It "\&106\ ``F'' \t107\ ``G'' \t110\ ``H'' \t111\ ``I'' \t112\ ``J''"
76 .It "\&113\ ``K'' \t114\ ``L'' \t115\ ``M'' \t116\ ``N'' \t117\ ``O''"
77 .It "\&120\ ``P'' \t121\ ``Q'' \t122\ ``R'' \t123\ ``S'' \t124\ ``T''"
78 .It "\&125\ ``U'' \t126\ ``V'' \t127\ ``W'' \t130\ ``X'' \t131\ ``Y''"
79 .It "\&132\ ``Z'' \t141\ ``a'' \t142\ ``b'' \t143\ ``c'' \t144\ ``d''"
80 .It "\&145\ ``e'' \t146\ ``f'' \t147\ ``g'' \t150\ ``h'' \t151\ ``i''"
81 .It "\&152\ ``j'' \t153\ ``k'' \t154\ ``l'' \t155\ ``m'' \t156\ ``n''"
82 .It "\&157\ ``o'' \t160\ ``p'' \t161\ ``q'' \t162\ ``r'' \t163\ ``s''"
83 .It "\&164\ ``t'' \t165\ ``u'' \t166\ ``v'' \t167\ ``w'' \t170\ ``x''"
84 .It "\&171\ ``y'' \t172\ ``z''"
85 .El
86 .Sh RETURN VALUES
87 The
88 .Fn isalnum
89 function returns zero if the character tests false and
90 returns non-zero if the character tests true.
91 .Sh COMPATIBILITY
92 Although
93 .Fn isalnum
94 accepts arguments outside of the range of the
95 .Vt "unsigned char"
96 type in locales with large character sets,
97 this is a
98 .Bx 4.4
99 extension and the
100 .Fn iswalnum
101 function should be used instead for maximum portability.
102 .Sh SEE ALSO
103 .Xr ctype 3 ,
104 .Xr isalpha 3 ,
105 .Xr isdigit 3 ,
106 .Xr iswalnum 3 ,
107 .Xr multibyte 3 ,
108 .Xr ascii 7
109 .Sh STANDARDS
110 The
111 .Fn isalnum
112 function conforms to
113 .St -isoC .