_tolower - transliterate uppercase characters to lowercase
[XSI] #include <ctype.h>
int _tolower(int c);
The _tolower() macro shall be equivalent to tolower(c) except that the application shall ensure that the argument c is an uppercase letter.
Upon successful completion, _tolower() shall return the lowercase letter corresponding to the argument passed.
No errors are defined.
tolower(), isupper(), the Base Definitions volume of IEEE Std 1003.1-2001, Chapter 7, Locale, <ctype.h>
First released in Issue 1. Derived from Issue 1 of the SVID.
The DESCRIPTION is updated to avoid use of the term "must" for application requirements.