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

ISSPACE(3)						   BSD Library Functions Manual 						ISSPACE(3)

NAME
isspace -- white-space character test
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <ctype.h> int isspace(int c); int isspace_l(int c, locale_t loc);
DESCRIPTION
The isspace() function tests for white-space characters. For any locale, this includes the following standard characters: ``\t'' ``\n'' ``\v'' ``\f'' ``\r'' `` '' In the "C" locale, isspace() returns non-zero for these characters only. The value of the argument must be representable as an unsigned char or the value of EOF. The isspace_l() function takes an explicit locale argument, whereas the isspace() function uses the current global or per-thread locale.
RETURN VALUES
The isspace() and isspace_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 iswspace() function should be used instead.
SEE ALSO
ctype(3), iswspace(3), multibyte(3), ascii(7)
STANDARDS
The isspace() function conforms to ISO/IEC 9899:1990 (``ISO C90''). The isspace_l() function conforms to IEEE Std 1003.1-2008 (``POSIX.1'').
BSD
July 30, 2012 BSD