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Add set16 function
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@ -58,6 +58,7 @@ extern int vm_segment_copy_buf(vm_segment *, const vm_8bit *, size_t, size_t, si
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extern int vm_segment_fread(vm_segment *, FILE *, size_t, size_t);
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extern int vm_segment_read_map(vm_segment *, size_t, vm_segment_read_fn);
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extern int vm_segment_set(vm_segment *, size_t, vm_8bit);
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extern int vm_segment_set16(vm_segment *, size_t, vm_16bit);
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extern int vm_segment_write_map(vm_segment *, size_t, vm_segment_write_fn);
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extern vm_16bit vm_segment_get16(vm_segment *, size_t);
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extern vm_8bit vm_segment_get(vm_segment *, size_t);
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@ -303,3 +303,28 @@ vm_segment_get_map_machine()
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{
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return map_mach;
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}
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int
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vm_segment_set16(vm_segment *segment, size_t addr, vm_16bit value)
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{
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vm_8bit lsb, msb;
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int err;
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lsb = value & 0xff;
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msb = value >> 8;
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// This data needs to be saved in little-endian order; e.g. if we
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// get $1234, then we need to store it as $34 $12.
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err = vm_segment_set(segment, addr, lsb);
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// If the previous set() worked out, then let's try it again with
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// the msb.
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if (err == OK) {
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err = vm_segment_set(segment, addr + 1, msb);
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}
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// If err != OK above, we will just return the err code. If err was
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// OK, but is not OK after the msb set, then we'll return with that
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// code.
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return err;
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}
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@ -174,3 +174,9 @@ Test(vm_segment, get16)
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cr_assert_eq(vm_segment_get16(segment, 0), 0x1234);
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}
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Test(vm_segment, set16)
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{
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vm_segment_set16(segment, 0, 0x2345);
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cr_assert_eq(vm_segment_get16(segment, 0), 0x2345);
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}
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