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39 lines
598 B
NASM
39 lines
598 B
NASM
%macro DosPrintMsg 1+
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%ifnid %1
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section .data
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%%str_to_print:db %1
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section .text
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mov dx,%%str_to_print
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mov ah,9
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int 0x21
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%else
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mov dx,(%1)
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mov ah,9
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int 0x21
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%endif
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%endmacro
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%macro DosExit 1
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%if (%1) == 0
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;use short-form return 0 exit
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int 0x20
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%elif ((%1) < 256) && ((%1) > 0)
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mov ax,0x4C00 | (%1)
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int 0x21
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%else
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%error Invalid return value
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%endif
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%endmacro
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section .text
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DosPrintMsg predefined_str
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DosPrintMsg "Using string with macro-defined label",10,0
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DosExit 0
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DosExit 1
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section .data
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predefined_str:db "Using string with predefined label",10,0
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