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3.4 isblank—blank character predicate

Synopsis

#include <ctype.h>
int isblank(int c);

Description
isblank is a function which classifies ASCII integer values by table lookup. It is a predicate returning non-zero for blank characters, and 0 for other characters. It is defined only if c is representable as an unsigned char or if c is EOF.


Returns
isblank returns non-zero if c is a blank character.


Portability
isblank is C99.

No supporting OS subroutines are required.