_tolower - transliterate uppercase characters to lowercase
[OB 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.
Applications should use the tolower() function instead of the obsolescent _tolower() function.
The _tolower() function may be removed in a future version.
XBD Locale, <ctype.h>
First released in Issue 1. Derived from Issue 1 of the SVID.
The normative text is updated to avoid use of the term "must" for application requirements.
The _tolower() function is marked obsolescent.
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