mirror of
https://github.com/byteworksinc/ORCA-C.git
synced 2024-11-15 07:06:05 +00:00
81 lines
2.1 KiB
NASM
81 lines
2.1 KiB
NASM
mcopy ccommon.macros
|
|
****************************************************************
|
|
*
|
|
* CopyString - copy a string
|
|
*
|
|
* Inputs:
|
|
* toPtr - location to copy to
|
|
* fromPtr - location to copy from
|
|
*
|
|
****************************************************************
|
|
*
|
|
CopyString start cc
|
|
|
|
subroutine (4:toPtr,4:fromPtr),0
|
|
|
|
short I,M
|
|
lda [fromPtr]
|
|
sta [toPtr]
|
|
tay
|
|
lb1 lda [fromPtr],Y
|
|
sta [toPtr],Y
|
|
dey
|
|
bne lb1
|
|
long I,M
|
|
|
|
return
|
|
end
|
|
|
|
****************************************************************
|
|
*
|
|
* Hash - find hash displacement
|
|
*
|
|
* Finds the displacement into an array of pointers using a
|
|
* hash function.
|
|
*
|
|
* Inputs:
|
|
* sPtr - points to string to find hash for
|
|
*
|
|
* Outputs:
|
|
* Returns the disp into the hash table
|
|
*
|
|
****************************************************************
|
|
*
|
|
Hash start cc
|
|
hashSize equ 876 # hash buckets - 1
|
|
|
|
sum equ 0 hash
|
|
length equ 2 length of string
|
|
|
|
subroutine (4:sPtr),4
|
|
|
|
stz sum default to bucket 0
|
|
lda [sPtr] set the length of the string
|
|
and #$00FF
|
|
sta length
|
|
ldy #1 start with char 1
|
|
lda [sPtr] if 1st char is '~', start with char 6
|
|
and #$FF00
|
|
cmp #'~'*256
|
|
bne lb1
|
|
ldy #6
|
|
|
|
lb1 lda [sPtr],Y get the value to add in
|
|
and #$3F3F
|
|
cpy length if there is only 1 char left then
|
|
bne lb2
|
|
and #$00FF and out the high byte
|
|
lb2 clc add it to the sum
|
|
adc sum
|
|
sta sum
|
|
iny next char
|
|
iny
|
|
cpy length
|
|
ble lb1
|
|
mod2 sum,#hashSize+1 return disp
|
|
asl sum
|
|
asl sum
|
|
|
|
return 2:sum
|
|
end
|