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[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.18.0/] [newlib/] [libc/] [ctype/] [isdigit.c] - Rev 262
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/* FUNCTION <<isdigit>>---decimal digit predicate INDEX isdigit ANSI_SYNOPSIS #include <ctype.h> int isdigit(int <[c]>); TRAD_SYNOPSIS #include <ctype.h> int isdigit(<[c]>); DESCRIPTION <<isdigit>> is a macro which classifies ASCII integer values by table lookup. It is a predicate returning non-zero for decimal digits, and 0 for other characters. It is defined only when <<isascii>>(<[c]>) is true or <[c]> is EOF. You can use a compiled subroutine instead of the macro definition by undefining the macro using `<<#undef isdigit>>'. RETURNS <<isdigit>> returns non-zero if <[c]> is a decimal digit (<<0>>--<<9>>). PORTABILITY <<isdigit>> is ANSI C. No supporting OS subroutines are required. */ #include <_ansi.h> #include <ctype.h> #undef isdigit int _DEFUN(isdigit,(c),int c) { return(__ctype_ptr__[c+1] & _N); }
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