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 this characters
     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), iswblank(3), multibyte(3), ascii(7), isalnum_l

STANDARDS

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

BSD                             August 21, 2004                            BSD