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; 20221210 bkw:
; Convert characters to inverse video (set bit 7). Actually, toggles
; bit 7 (passing it inverse video characters turn them into normal ones).
; Based on scrcode macro from cc65's atari.mac. Probably this should
; ship with cc65...
; Helper macro that converts and outputs one character
.macro _inv char
.if char > $ff
.error "inverse: Character constant out of range"
.else
.byte char .bitxor $80
.endif
.endmacro
.macro inverse arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8, arg9
; Bail out if next argument is empty
.if .blank (arg1)
.exitmacro
.endif
; Check for a string
.if .match ({arg1}, "")
; Walk over all string chars
.repeat .strlen (arg1), i
_inv {.strat (arg1, i)}
.endrepeat
; Check for a number
.elseif .match (.left (1, {arg1}), 0)
; Just output the number
_inv arg1
; Check for a character
.elseif .match (.left (1, {arg1}), 'a')
; Just output the character
_inv arg1
; Anything else is an error
.else
.error "inv: invalid argument type"
.endif
; Call the macro recursively with the remaining args
inverse arg2, arg3, arg4, arg5, arg6, arg7, arg8, arg9
.endmacro
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