copych( tostrng, topos, fromstr, frompos, count );
COPYCH copies "count" characters from string "fromstr" starting at character position "frompos" into string "tostrng" starting at character position "TOPOS". It does not put a "*0" at the end of the copied string and it copies exactly "count" characters so a call with "count" equal to zero does nothing.
For instance, if you have
a = "abcdefgh" b = "1234567890"
and you make the following call:
copych(a, 3, b, 4, 2);
Then you would have
a = "abc56fgh" b = "1234567890"
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