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#if 0
#include <ctype.h>
/** convert an uppercase letter to lowercase **/
#define _tolower(__c) tolower(__c)
/***
converts an uppercase letter to its equivalent lowercase letter in the current
locale.
***/
/*
ASSERT_REPRESENTABLE(c, 0, UCHAR_MAX, unsigned char, EOF)
RETURN_SUCCESS(ARGUMENT(c) converted to uppercase)
UNDEFINED(ARGUMENT(c) is not an upper-case letter)
LC_CTYPE
XOPEN(4)
XOBSOLETE(700, FUNCTION(tolower))
*/
#endif
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