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FreeBSD 11.0 - man page for isblank (freebsd section 3)

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); int isblank_l(int c, locale_t loc);
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, a successful isblank() 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() function returns zero if the character tests false and returns 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() function should be used instead.
SEE ALSO
ctype(3), iswblank(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'').
BSD
July 17, 2005 BSD

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