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ISBLANK(3) Library Functions Manual ISBLANK(3)

isblankblank-space character test

#include <ctype.h>

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() function 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.

July 6, 2013 OpenBSD-5.7