ISBLANK(3) BSD Library Functions Manual ISBLANK(3)NAME
isblank -- space or tab character test
Standard C Library (libc, -lc)
The isblank() function tests for a space or tab character. For any locale, this includes the following standard characters:
`` '' `` ''
In the "C" locale, a successful isblank() 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 isblank() 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 iswblank() function should be used instead.
SEE ALSO ctype(3), isalnum_l(3), iswblank(3), ascii(7)STANDARDS
The isblank() function conforms to ISO/IEC 9899:1999 (``ISO C99'').
BSD July 17, 2005 BSD
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