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ISBLANK(3) Library Functions Manual ISBLANK(3)

isblankblank-space character test

#include <ctype.h>

int
isblank(int c);

The () function tests for the standard blank-space characters. The standard blank-space characters are the following:

‘ ’
Space character.
Horizontal tab.

In the C locale, () returns true only for the standard blank-space characters.

The isblank() macro returns zero if the character tests false or non-zero if the character tests true.

isalnum(3), isalpha(3), isascii(3), iscntrl(3), isdigit(3), isgraph(3), islower(3), isprint(3), ispunct(3), isspace(3), isupper(3), isxdigit(3), stdio(3), toascii(3), tolower(3), toupper(3), ascii(7)

The argument to isblank() must be EOF or representable as an unsigned char; otherwise, the result is undefined.

May 31, 2007 OpenBSD-5.1