_tolower - transliterate upper-case characters to lower-case
#include <ctype.h> int _tolower(int c);
The _tolower() macro is equivalent to tolower(3C) except that the argument c must be an upper-case letter.
On successful completion, _tolower() returns the lower-case letter corresponding to the argument passed.
No errors are defined.
See attributes(5) for descriptions of the following attributes:
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