The Best of Select: Games 5/cd.iso/games/snarf/mandir.asm

Assembly Source File | 1988-01-16 | 6KB | 466 lines

page 60,132
title TFMISC --- MISCELLANEOUS ASSEMBLY ROUTINES FOR TIGER FOX
;
debug    equ    0
;
_text    segment    byte public 'code'
_text    ends
_data    segment    word public 'data'
_data    ends
const    segment    word public 'const'
const    ends
_bss    segment    word public 'bss'
_bss    ends
;
        extrn    _flabel:near
;
        public    _set_bug_loc
        public    _bug_dir
        public    _man_dirs
        public    _man_dist
;
dgroup    group    const, _bss, _data
    assume    cs:_text, ds:dgroup, ss:dgroup, es:dgroup
;
_data    segment    word public 'data'
;
wmaze        db    820 dup (?)
stack1        db    400 dup (0)
stack2        db    400 dup (0)
mandist        dw    ?
mandir        db    ?
stk2ptr        dw    ?
stk1ptr        dw    ?
buglocs        dw    20 dup (-2)
bugdirs        dw    20 dup (?)
;
_data    ends
;
;
;
_text    segment
;
;
; man_dirs(&field, man-field-index);
;
_man_dirs:
    push    bp
    mov    bp,sp
    push    si
    push    di
    call    mansub2
    pop    di
    pop    si
    pop    bp
    ret
;
; man_dist(&field, loc x, loc y, man x, man y);
;
_man_dist:
    push    bp
    mov    bp,sp
    push    si
    push    di
    call    mansub1
    mov    ax,mandist
    pop    di
    pop    si
    pop    bp
    ret
;
; bug_dir(n);
;
_bug_dir:
    push    bp
    mov    bp,sp
    mov    bx,[bp+4]
    shl    bx,1
    mov    ax,[bx+bugdirs]
    pop    bp
    ret
;
; set_bug_loc(n, bug-field-index);
;
_set_bug_loc:
    push    bp
    mov    bp,sp
    lea    ax,wmaze
    mov    ax,[bp+6]
    mov    bx,[bp+4]
    shl    bx,1
    mov    [bx+buglocs],ax
    pop    bp
    ret
;
;
mansub1:
    cld
    mov    mandist,1
    mov    mandir,-1
    mov    si,[bp+4]        ; get maze address
    lea    di,wmaze
    mov    cx,410
    rep    movsw

    mov    ax,[bp+12]        ; get man y
    mov    bl,41
    mul    bl
    add    ax,[bp+10]
    lea    si,wmaze
    add    si,ax
    mov    byte ptr [si],30h    ; place man flag

    mov    ax,[bp+8]        ; get ptr to bug location
    mov    bl,41
    mul    bl
    add    ax,[bp+6]
    lea    si,wmaze
    add    si,ax            ; si = search start point

    mov    byte ptr [si],1        ; put brick at bug's start point

    lea    ax,stack1        ; init stacks
    mov    stk1ptr,ax
    lea    ax,stack2
    mov    stk2ptr,ax

    mov    dh,0            ; seed stack1 with first 4 dirs
    mov    di,si
    inc    di
    call    chkmovi

    mov    dh,1
    mov    di,si
    sub    di,41
    call    chkmovi

    mov    dh,2
    mov    di,si
    dec    di
    call    chkmovi

    mov    dh,3
    mov    di,si
    add    di,41
    call    chkmovi
whilp10:
    lea    si,stack1        ; ripple search out from there
    cmp    si,stk1ptr
    mov    si,stk1ptr
    jz    whilp20
    dec    si
    mov    dh,[si]
    dec    si
    dec    si
    mov    stk1ptr,si
    mov    di,[si]

    push    di
    inc    di
    call    chkmov
    pop    di

    push    di
    sub    di,41
    call    chkmov
    pop    di

    push    di
    dec    di
    call    chkmov
    pop    di

    add    di,41
    call    chkmov
    cmp    mandir,-1
    jz    whilp10
exitmandir:
    ret
whilp20:
    inc    mandist
    lea    si,stack2
    lea    di,stack1
    mov    cx,stk2ptr
    sub    cx,si
    jz    exitmandir
    mov    stk2ptr,si
    rep    movsb
    mov    stk1ptr,di
    jmp    whilp10
;
; di=maze ptr    dh=original direction
;
chkmov:
    cmp    byte ptr [di],0        ; empty?
    jz    cmiyes            ; jif yes
    cmp    byte ptr [di],30h    ; man?
    jnz    cmino            ; jif no
    mov    mandir,dh
cmiyes:
    mov    byte ptr [di],1        ; mark as been there
    mov    ax,di
    mov    di,stk2ptr
    stosw
    mov    al,dh
    stosb
    mov    stk2ptr,di
cmino:
    ret
;
;
;
chkmovi:
    call    chkmov
    lea    di,stack2
    cmp    di,stk2ptr
    jz    cmino
    mov    stk2ptr,di
    mov    ax,[di]
    mov    bx,stk1ptr
    mov    [bx],ax
    inc    bx
    inc    bx
    mov    al,[di+2]
    mov    [bx],al
    inc    bx
    mov    stk1ptr,bx
    ret
;
;
;
;
;
mansub2:
    cld
    mov    si,[bp+4]        ; get maze address
    lea    di,wmaze
    mov    cx,410
    rep    movsw

    lea    di,bugdirs        ; clear bugdirs table
    mov    cx,20
    mov    ax,-1
    rep    stosw

    lea    si,buglocs
    lea    bx,wmaze
    mov    al,50h            ; bug flag
ms21:
    mov    di,[si]            ; get ptr to bug location
    inc    si
    inc    si
    cmp    di,-2            ; end of list?
    jz    ms22            ; jif yes
    or    di,di            ; bug exist?
    jz    ms26
    add    di,bx
    mov    [di],al            ; set bug location in maze
ms26:
    inc    al            ; bump flag to next bug number
    jmp    ms21
ms22:
    lea    si,wmaze
    add    si,[bp+6]            ; si = search start point
    mov    byte ptr [si],1        ; put brick at man's start point

    lea    ax,stack1        ; init stacks
    mov    stk1ptr,ax
    lea    ax,stack2
    mov    stk2ptr,ax

    mov    dx,2            ; seed stack1 with first 4 dirs
    mov    di,si
    inc    di
    call    chkmovi2

    mov    dx,3
    mov    di,si
    sub    di,41
    call    chkmovi2

    mov    dx,0
    mov    di,si
    dec    di
    call    chkmovi2

    mov    dx,1
    mov    di,si
    add    di,41
    call    chkmovi2
ms23:
    lea    si,stack1        ; ripple search out from there
    cmp    si,stk1ptr
    mov    si,stk1ptr
    jnz    ms24

    lea    si,stack2
    lea    di,stack1
    mov    cx,stk2ptr
    sub    cx,si
    jz    ms25
    mov    stk2ptr,si
    rep    movsb
    mov    stk1ptr,di
    jmp    ms23
ms24:
    dec    si
    dec    si
    mov    stk1ptr,si
    mov    di,[si]

    push    di
    inc    di
    mov    dx,2
    call    chkmov2
    pop    di

    push    di
    sub    di,41
    mov    dx,3
    call    chkmov2
    pop    di

    push    di
    dec    di
    mov    dx,0
    call    chkmov2
    pop    di

    add    di,41
    mov    dx,1
    call    chkmov2
    jmp    ms23
ms25:
    ret
;
; di=maze ptr    dh=original direction
;
chkmov2:
    cmp    byte ptr [di],0        ; empty?
    jz    cmiyes2            ; jif yes
    mov    al,[di]            ; get byte
    and    al,0f0h
    cmp    al,50h            ; bug?
    jnz    cmino2            ; jif no
    mov    bl,[di]
    and    bl,0fh
    xor    bh,bh
    shl    bx,1
    mov    [bx+bugdirs],dx
cmiyes2:
    mov    byte ptr [di],1        ; mark as been there
    mov    ax,di
    mov    di,stk2ptr
    stosw
    mov    stk2ptr,di
cmino2:
    ret
;
;
;
chkmovi2:
    call    chkmov2
    lea    di,stack2
    cmp    di,stk2ptr
    jz    cmino2
    mov    stk2ptr,di
    mov    ax,[di]
    mov    di,stk1ptr
    stosw
    mov    stk1ptr,di
    ret
;
if debug
;
;
showhere:
    push    bp
    push    si
    push    di
    mov    bp,sp
    lea    di,wmaze
    cld
    add    al,'0'
    stosb
    xor    ax,ax
    stosb
    push    ax
    push    ax
    mov    ax,15
    push    ax
    lea    di,wmaze
    push    di
    mov    ax,8
    push    ax
    mov    ax,30
    push    ax
    call    _flabel
    mov    sp,bp
    pop    di
    pop    si
    pop    bp
    ret
;
;
show_hex:
    push    ax
    push    bp
    push    si
    push    di
    mov    bp,sp
    lea    di,wmaze
    cld
    push    ax
    mov    al,ah
    call    show_al
    pop    ax
    call    show_al
    xor    ax,ax
    stosb
    push    ax
    push    ax
    mov    ax,15
    push    ax
    lea    di,wmaze
    push    di
    mov    ax,8
    push    ax
    mov    ax,50
    push    ax
    call    _flabel
    mov    sp,bp
    pop    di
    pop    si
    pop    bp
    pop    ax
    ret

show_al:
    shl    ax,1
    shl    ax,1
    shl    ax,1
    shl    ax,1
    shr    al,1
    shr    al,1
    shr    al,1
    shr    al,1
    and    ax,0f0fh
    add    ax,3030h
    cmp    al,'9'
    jbe    alok
    add    al,7
alok:
    cmp    ah,'9'
    jbe    ahok
    add    ah,7
ahok:
    xchg    al,ah
    stosw
    ret
;
endif
;
_text    ends
;
    end