42 lines
854 B
C
42 lines
854 B
C
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#include "mbrmake.h"
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WORD HashAtomStr (char *pStr) {
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WORD hash = 0;
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while (*pStr)
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hash += (hash << 5) + *pStr++;
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return (hash % (MAXSYMPTRTBLSIZ-1));
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}
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#if rjsa
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HashAtomStr PROC NEAR USES DS SI, npsz:DWORD
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xor ax,ax ; (ax) = byte-extended-to-word
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mov cx,ax ; (cx) = hash
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mov dx,ax ; (dx) = high part for later div
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cld
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lds si,npsz ; (si) = pointer to string
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align 4
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hfs1: lodsb ; get next byte
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or al,al ; are we at end of string?
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jz hfs2 ; yes, compute div and we're done
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mov bx,cx
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shl bx,1
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shl bx,1
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shl bx,1
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shl bx,1
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shl bx,1
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add cx,bx ; (newcx) = (oldcx) + (oldcx) << 5
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add cx,ax ; (cx) += (cx) << 5 + (ax)
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jmp hfs1
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hfs2: mov ax,4094 ; magic divider
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xchg ax,cx ; (dx:ax) = number, (cx) = dividend
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div cx
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mov ax,dx
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ret
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HashAtomStr ENDP
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end
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#endif
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