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Both csetlen() and csetcol() take a code set number codeset, which must be 0, 1, 2, or 3. The csetlen() function returns
the number of bytes needed to represent a character of the given Extended Unix Code (EUC) code set, excluding the single-shift characters SS2 and SS3 for codesets 2 and 3. The csetcol()
function returns the number of columns a character in the given EUC code set would take on the display.
The csetno() function is implemented as a macro that returns a codeset number (0, 1, 2, or 3) for the EUC character whose first byte is c. For example,
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#include<euc.h>
...
x+=csetcol(csetno(c));
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increments a counter "x" (such as the cursor position) by the width of the character whose first byte is c.
The wcsetno() function is implemented as a macro that returns a codeset number (0, 1, 2, or 3) for the given process code character pc. For example,
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#include<euc.h>
#include<widec.h>
...
x+=csetcol(wcsetno(pc));
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increments a counter "x" (such as the cursor position) by the width of the Process Code character pc.
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