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ISBLANK(3) BSD Library Functions Manual ISBLANK(3)
NAME
isblank -- blank-space character test
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <ctype.h>
int
isblank(int c);
DESCRIPTION
The isblank() function tests for the standard blank-space characters. The standard blank-space characters are the following:
' ' Space character.
Horizontal tab.
In the ``C'' locale, isblank() returns true only for the standard blank-space characters.
RETURN VALUES
The isblank() function returns zero if the character tests false and returns non-zero if the character tests true.
SEE ALSO
ctype(3), isalnum(3), isalpha(3), isascii(3), iscntrl(3), isdigit(3), isgraph(3), islower(3), isprint(3), ispunct(3), isspace(3), isupper(3),
isxdigit(3), stdio(3), toascii(3), tolower(3), toupper(3), ascii(7)
CAVEATS
The argument to isblank() must be EOF or representable as an unsigned char; otherwise, the behavior is undefined. See the CAVEATS section of
ctype(3) for more details.
BSD
April 17, 2008 BSD