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ISSPACE(3) FreeBSD Library Functions Manual ISSPACE(3)
NAME
isspace, isspace_l - 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() and isspace_l() functions test for white-space characters.
For any locale, this includes the following standard characters:
``\t'' ``\n'' ``\v'' ``\f'' ``\r'' `` ''
In the "C" locale, isspace() and isspace_l() return 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() or
iswspace_l() function should be used instead.
SEE ALSO
ctype(3), ctype_l(3), iswspace(3), iswspace_l(3), multibyte(3),
xlocale(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").
HISTORY
The isspace() function first appeared in Version 7 AT&T UNIX.
FreeBSD 14.0-RELEASE-p6 December 19, 2022 FreeBSD 14.0-RELEASE-p6