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[/] [or1k/] [trunk/] [newlib/] [newlib/] [libc/] [ctype/] [toupper.c] - Rev 1765
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/* FUNCTION <<toupper>>---translate characters to upper case INDEX toupper INDEX _toupper ANSI_SYNOPSIS #include <ctype.h> int toupper(int <[c]>); int _toupper(int <[c]>); TRAD_SYNOPSIS #include <ctype.h> int toupper(<[c]>); int _toupper(<[c]>); DESCRIPTION <<toupper>> is a macro which converts lower-case characters to upper case, leaving all other characters unchanged. It is only defined when <[c]> is an integer in the range <<EOF>> to <<255>>. You can use a compiled subroutine instead of the macro definition by undefining this macro using `<<#undef toupper>>'. <<_toupper>> performs the same conversion as <<toupper>>, but should only be used when <[c]> is known to be a lowercase character (<<a>>--<<z>>). RETURNS <<toupper>> returns the upper-case equivalent of <[c]> when it is a character between <<a>> and <<z>>, and <[c]> otherwise. <<_toupper>> returns the upper-case equivalent of <[c]> when it is a character between <<a>> and <<z>>. If <[c]> is not one of these characters, the behaviour of <<_toupper>> is undefined. PORTABILITY <<toupper>> is ANSI C. <<_toupper>> is not recommended for portable programs. No supporting OS subroutines are required. */ #include <_ansi.h> #include <ctype.h> #undef toupper int _DEFUN(toupper,(c),int c) { return islower(c) ? c - 'a' + 'A' : c; }