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ISBLANK(3) Library Functions Manual ISBLANK(3)

isblankspace or tab character test

#include <ctype.h>

int
isblank(int c);;

The () function tests for a space or tab character.

The isblank() function returns zero if the character tests false and returns non-zero if the character tests true.

ctype(3), ascii(7)

4.4BSD-Lite2 June 4, 1993 ISBLANK(3)