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51 lines
1.4 KiB
Plaintext
51 lines
1.4 KiB
Plaintext
; Convert characters to screen codes
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; Macro that converts one character.
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; scrbyte() can be used as an instruction operand
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.define scrbyte(code) (<(.strat ("h@dbdlhh", code >> 5) << 4) ^ code)
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; Helper macro that stores one character
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.macro _scrcode char
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.if (char < 256)
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.byte scrbyte {char}
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.else
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.error "scrcode: Character constant out of range"
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.endif
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.endmacro
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.macro scrcode arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8, arg9
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; Bail out if next argument is empty
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.if .blank ({arg1})
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.exitmacro
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.endif
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; Check for a string
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.if .match ({arg1}, "")
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; Walk over all string chars
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.repeat .strlen (arg1), i
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_scrcode {.strat (arg1, i)}
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.endrepeat
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; Check for a number
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.elseif .match (.left (1, {arg1}), 0)
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; Just output the number
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_scrcode arg1
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; Check for a character
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.elseif .match (.left (1, {arg1}), 'a')
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; Just output the character
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_scrcode arg1
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; Anything else is an error
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.else
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.error "scrcode: invalid argument type"
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.endif
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; Call the macro recursively with the remaining args
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scrcode arg2, arg3, arg4, arg5, arg6, arg7, arg8, arg9
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.endmacro
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