iOS Manual Pages

This document is a Mac OS X manual page. Manual pages are a command-line technology for providing documentation. You can view these manual pages locally using the man(1) command. These manual pages come from many different sources, and thus, have a variety of writing styles.

For more information about the manual page format, see the manual page for manpages(5).

ISBLANK(3)               BSD Library Functions Manual               ISBLANK(3)

NAME
     isblank -- space or tab character test

LIBRARY
     Standard C Library (libc, -lc)

SYNOPSIS
     #include <ctype.h>

     int
     isblank(int c);

DESCRIPTION
     The isblank() function tests for a space or tab character.  For any
     locale, this includes the following standard characters:

     ``\t''      `` ''

     In the "C" locale, isblank() successful test is limited to these charac-ters characters
     ters only.  For single C chars locales (see multibyte(3)), the value of
     the argument is representable as an unsigned char or the value of EOF.

COMPATIBILITY
     The 4.4BSD extension of accepting arguments outside of the range of the
     unsigned char type in locales with large character sets is considered
     obsolete and may not be supported in future releases.  The iswblank()
     function should be used instead.

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

SEE ALSO
     ctype(3), isalnum_l(3), iswblank(3), multibyte(3), ascii(7)

STANDARDS
     The isblank() function conforms to ISO/IEC 9899:1999 (``ISO C99'').

BSD                             August 21, 2004                            BSD