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[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.18.0/] [newlib/] [libc/] [ctype/] [isalpha.c] - Rev 301
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/* FUNCTION <<isalpha>>---alphabetic character predicate INDEX isalpha ANSI_SYNOPSIS #include <ctype.h> int isalpha(int <[c]>); TRAD_SYNOPSIS #include <ctype.h> int isalpha(<[c]>); DESCRIPTION <<isalpha>> is a macro which classifies ASCII integer values by table lookup. It is a predicate returning non-zero when <[c]> represents an alphabetic ASCII character, and 0 otherwise. 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 isalpha>>'. RETURNS <<isalpha>> returns non-zero if <[c]> is a letter (<<A>>--<<Z>> or <<a>>--<<z>>). PORTABILITY <<isalpha>> is ANSI C. No supporting OS subroutines are required. */ #include <_ansi.h> #include <ctype.h> #undef isalpha int _DEFUN(isalpha,(c),int c) { return(__ctype_ptr__[c+1] & (_U|_L)); }
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