MirBSD manpage: isblank(3)

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

NAME

     isblank - blank-space character test

SYNOPSIS

     #include <ctype.h>

     int
     isblank(int c);

DESCRIPTION

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

           ' '    Space character.
           \t     Horizontal tab.

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

RETURN VALUES

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

SEE ALSO

     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)

CAVEATS

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

MirBSD #10-current            September 14, 1993                             1