isspace —
whitespace character test
#include
<ctype.h>
int
isspace(
int
c);
The
isspace() function tests for the standard
whitespace characters for which
isalnum(3) is
false. The standard whitespace characters are the following:
- ‘ ’
- Space character.
\f- Form feed.
\n- New-line.
\r- Carriage return.
\t- Horizontal tab.
\v- And vertical tab.
In the C locale,
isspace() returns true only
for the standard whitespace characters.
The
isspace() function returns zero if the
character tests false or non-zero if the character tests true.
isalnum(3),
isalpha(3),
isascii(3),
isblank(3),
iscntrl(3),
isdigit(3),
isgraph(3),
islower(3),
isprint(3),
ispunct(3),
isupper(3),
isxdigit(3),
stdio(3),
toascii(3),
tolower(3),
toupper(3),
ascii(7)
The
isspace() function conforms to
ANSI X3.159-1989
(“ANSI C89”).
The
isspace() function first appeared in
Version 7 AT&T UNIX.
The argument to
isspace() must be
EOF or representable as an
unsigned char; otherwise, the result is
undefined.
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