_tolower - transliterate uppercase characters to lowercase
#include <ctype.h> int _tolower(int c);
The _tolower() macro is equivalent to tolower(3C) except that the argument c must be an uppercase letter.
On successful completion, _tolower() returns the lowercase letter corresponding to the argument passed.
No errors are defined.
See attributes(7) for descriptions of the following attributes:
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isupper(3C), tolower(3C), attributes(7), standards(7)
The Single UNIX Specification, Version 4 standard marked this interface obsolescent.