4.4BSD/usr/share/man/cat3/isblank.0

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ISBLANK(3)                  BSD Programmer's Manual                 ISBLANK(3)

NNAAMMEE
     iissbbllaannkk - space or tab character test

SSYYNNOOPPSSIISS
     ##iinncclluuddee <<ccttyyppee..hh>>

     _i_n_t
     iissbbllaannkk(_i_n_t _c);

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

RREETTUURRNN VVAALLUUEESS
     The iissbbllaannkk() function returns zero if the character tests false and re-
     turns non-zero if the character tests true.

SSEEEE AALLSSOO
     ctype(3),  ascii(7)

4.4BSD                           June 4, 1993                                1