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

NAME

isblank - space or tab character test

CONTENTS

Library
Synopsis
Description
Return Values
Compatibility
See Also
Standards

LIBRARY


.Lb libc

SYNOPSIS


.In ctype.h int isblank "int c"

DESCRIPTION

The isblank function tests for a space or tab character. For any locale, this includes the following standard characters:

"‘‘\t’’ ‘‘ ’’"

In the "C" locale isblank successful test is limited to this characters only. 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 isblank 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 iswblank function should be used instead.

SEE ALSO

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

STANDARDS


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