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The
function tests for the standard white-space characters for which is
false. The standard white-space characters are the following: Space character.
Form feed. New-line. Carriage return. Horizontal tab. And vertical tab.
In the locale, returns true only for the standard white-space characters.
The macro returns zero if the character tests false and returns
non-zero if the character tests true.
The
function conforms to
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