String primitives

You can use these primitives to manipulate strings (in the argument field of GASP statements):

.LEN("str")

Calculate the length of string "str", as an absolute expression. For example, `.RES.B .LEN("sample")' reserves six bytes of memory.

.INSTR("string", "seg", ix)

Search for the first occurrence of seg after position ix of string. For example, `.INSTR("ABCDEFG", "CDE", 0)' evaluates to the absolute result 2. The result is -1 if seg does not occur in string after position ix.

.SUBSTR("string",start,len)

The substring of string beginning at byte number start and extending for len bytes.