newptr = _bcdptr(oldptr,offset);
"_bcdptr" creates a BCD pointer. This is a special type of "(void *)" pointer guaranteed to point to a BCD character. For example,
new = _bcdptr(old,-1)returns a pointer to the BCD character immediately preceding the one indicated by "old". "old" can be a pointer to a word boundary, or to another BCD character.
BCD pointers can only be used in a limited set of operations: comparisons for equality/inequality and assignments. The BCD string indicated by a BCD pointer can be printed with the "%_s" placeholder of "printf" and related routines.
expl c lib _bcdasc
expl c lib _ascbcd
expl c lib printf
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