ISALNUM(3) |
FreeBSD Library Functions Manual |
ISALNUM(3) |
NAME
isalnum —
alphanumeric character test
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include < ctype.h>
int
isalnum( int c);
int
isalnum_l( int c, locale_t loc);
DESCRIPTION
The
isalnum() function tests 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'' |
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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() function returns 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() function should be used instead.
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”).