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ISALNUM (3) | C library functions | Unix Manual Pages | :man

NAME

isalnum - alphanumeric character test

CONTENTS

Library
Synopsis
Description
Return Values
Compatibility
See Also
Standards

LIBRARY


.Lb libc

SYNOPSIS


.In 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 char s locales (see multibyte(3)) 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.

COMPATIBILITY

The BSD 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 iswalnum function should be used instead.

SEE ALSO

ctype(3), isalpha(3), isdigit(3), iswalnum(3), multibyte(3), ascii(7)

STANDARDS


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