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Téma musí začínat písmenem nebo číslem, může obsahovat pomlčky („-“) a může být dlouhé až 35 znaků.
110 řádky
2.3 KiB
110 řádky
2.3 KiB
void strcpy (destination, destination_segment, source, source_segment );
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void memcpy (destination, destination_segment, source, source_segment, num_bytes );
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void strcpy (destination, destination_segment, source, source_segment )
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char *destination;
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int destination_segment;
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char *source;
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int source_segment;
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{
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#asm
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; copy two strings
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; IN si: the first (zero terminated) string
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; IN di: the second (zero terminated) string
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; OUT SF and ZF (same semantics as cmp)
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#define DESTINATION 4[bp];
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#define DESTINATION_SEGMENT 6[bp];
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#define SOURCE 8[bp];
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#define SOURCE_SEGMENT 10[bp];
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push bp
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mov bp,sp
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stringcompare:
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push ax
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push bx
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push di
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push es
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push si
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push ds
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mov ax, DESTINATION;
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mov di, ax
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mov ax, DESTINATION_SEGMENT;
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mov es, ax
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mov ax, SOURCE;
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mov si, ax
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mov ax, SOURCE_SEGMENT;
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mov ds, ax
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mov cx, 0x050 // TODO(Jørn) Hardcded number of bytes to copy
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.loop:
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movsb
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cmp cx, 0x0
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je .end
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dec cx
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jmp .loop
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.end:
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pop ds
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pop si
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pop es
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pop di
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pop bx
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pop ax
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pop bp
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#endasm
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}
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void memcpy (destination, destination_segment, source, source_segment, num_bytes)
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void *destination;
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int destination_segment;
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void *source;
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int source_segment;
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int num_bytes;
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{
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#asm
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; copy two strings
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; IN si: the first (zero terminated) string
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; IN di: the second (zero terminated) string
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; OUT SF and ZF (same semantics as cmp)
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#define DESTINATION 4[bp];
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#define DESTINATION_SEGMENT 6[bp];
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#define SOURCE 8[bp];
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#define SOURCE_SEGMENT 10[bp];
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#define NUM_BYTES 12[bp];
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push bp
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mov bp,sp
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memcpy:
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push ax
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push bx
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push di
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push es
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push si
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push ds
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mov ax, DESTINATION;
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mov di, ax
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mov ax, DESTINATION_SEGMENT;
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mov es, ax
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mov ax, SOURCE;
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mov si, ax
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mov ax, SOURCE_SEGMENT;
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mov ds, ax
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mov cx, NUM_BYTES
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.memcpy_loop:
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movsb
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cmp cx, 0x0
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je .end
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dec cx
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jmp .loop
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.memcpy_end:
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pop ds
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pop si
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pop es
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pop di
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pop bx
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pop ax
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pop bp
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#endasm
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}
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