ISALNUM(3) BSD Library Functions Manual ISALNUM(3)NAMEisalnum — 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 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 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''
RETURN VALUES
The isalnum() function returns zero if the character tests false and
returns non-zero if the character tests true.
SEE ALSOctype(3), isalpha(3), isdigit(3), ascii(7)STANDARDS
The isalnum() function conforms to ISO/IEC 9899:1990 (“ISO C90”).
BSD June 4, 1993 BSD
