wconv(3W) — MISC. REFERENCE MANUAL PAGES
NAME
wconv: towupper, towlower − translate characters
SYNOPSIS
#include <ctype.h>
#include <widec.h>
#include <wctype.h> wchar_t towupper(wchar_t c); wchar_t towlower(wchar_t c);
DESCRIPTION
If the argument to towupper() represents a lower-case letter of the ASCII or supplementary code sets, the result is the corresponding upper-case letter. If the argument to towlower() represents an upper-case letter of the ASCII or supplementary code sets, the result is the corresponding lower-case letter.
In the case of all other arguments, the return value in unchanged. The table which is used for translation is generated by wchrtbl(1M).