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

NAME

isxdigit, ishexnumber - hexadecimal-digit character test

CONTENTS

Library
Synopsis
Description
Return Values
Compatibility
See Also
Standards
History

LIBRARY


.Lb libc

SYNOPSIS


.In ctype.h int isxdigit "int c" int ishexnumber "int c"

DESCRIPTION

The isxdigit function tests for any hexadecimal-digit character. Regardless of locale, this includes the following characters only:

"‘‘0’’ ‘‘1’’ ‘‘2’’ ‘‘3’’ ‘‘4’’"
"‘‘5’’ ‘‘6’’ ‘‘7’’ ‘‘8’’ ‘‘9’’"
"‘‘A’’ ‘‘B’’ ‘‘C’’ ‘‘D’’ ‘‘E’’"
"‘‘F’’ ‘‘a’’ ‘‘b’’ ‘‘c’’ ‘‘d’’"
"‘‘e’’ ‘‘f’’"

The ishexnumber function behaves similarly to isxdigit, but may recognize additional characters, depending on the current locale setting.

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.

RETURN VALUES

The isxdigit 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 iswxdigit function should be used instead.

SEE ALSO

ctype(3), iswxdigit(3), multibyte(3), ascii(7)

STANDARDS

HISTORY


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