ISBLANK(3)             FreeBSD Library Functions Manual             ISBLANK(3)

NAME

     isblank, isblank_l - space or tab character test

LIBRARY

     Standard C Library (libc, -lc)

SYNOPSIS

     #include <ctype.h>

     int
     isblank(int c);

     int
     isblank_l(int c, locale_t loc);

DESCRIPTION

     The isblank() and isblank_l() functions test for a space or tab
     character.  For any locale, this includes the following standard
     characters:

     "\t"    " "

     In the "C" locale, a successful isblank() or isblank_l() test is limited
     to these characters only.  The value of the argument must be
     representable as an unsigned char or the value of EOF.

     The isblank_l() function takes an explicit locale argument, whereas the
     isblank() function uses the current global or per-thread locale.

RETURN VALUES

     The isblank() and isblank_l() functions return zero if the character
     tests false and return non-zero if the character tests true.

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() or
     iswblank_l() function should be used instead.

SEE ALSO

     ctype(3), ctype_l(3), iswblank(3), iswblank_l(3), xlocale(3), ascii(7)

STANDARDS

     The isblank() function conforms to ISO/IEC 9899:1999 ("ISO C99").  The
     isblank_l() function conforms to IEEE Std 1003.1-2008 ("POSIX.1").

FreeBSD 15.1-STABLE-HBSD       December 19, 2022                    ISBLANK(3)