ISSPACE(3) Library Functions Manual ISSPACE(3)

isspace — white-space character test

Standard C Library (libc, -lc)

#include <ctype.h>

int
isspace(int c);

The () function tests for the white-space characters. For any locale, this includes the following standard characters:

``\t''``\n''``\v''``\f''``\r''`` ''

In the "C" locale, () successful 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 isspace() function returns zero if the character tests false and returns non-zero if the character tests true.

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.

ctype(3), isalnum_l(3), iswspace(3), multibyte(3), ascii(7)

The isspace() function conforms to ISO/IEC 9899:1990 (“ISO C90”).

July 17, 2005 macOS 15.2