page 60,132 title Assembler utilities .286 ;------------------------------------------------------------------------------ ; ASMTOOLS.ASM Alan C. Partis ; Copyright (C) AP MicroSystems, Inc. ; 1994 - All rights reserved ; ; Description: This is a collection of ASM utility routines ; ; Technical Reference: ; ; ; Contents: fstrcpy() ; GetDOSVer() ; GetIntVect() ; HexDump() ; PrintXByte() ; SetIntVect() ; StrDump() ; _StrDump() ; ; Date Initials Comments ; ----------------------------------------------------------------------- ; 08-20-94 acp initial creation ; ;------------------------------------------------------------------------------ include stdapms.inc DGROUP group _DATA, _CONST, _BSS ;linker order _DATA segment word public 'DATA' assume ds:DGROUP _DATA ends _CONST segment word public 'CONST' assume ds:DGROUP _CONST ends _BSS segment word public 'BSS' assume ds:DGROUP _BSS ends _ASMTOOLS segment word public 'CODE' assume cs:_ASMTOOLS, ds:DGROUP ;------------------------------------------------------------------------------ ; _fstrcpy Alan Partis ; Copyright (C) AP MicroSystems, Inc. ; 1994 - All rights reserved ; ; Description: copies bytes from 'src' string to 'dest' string up to, and ; including, a terminating NULL in the 'dest' string. ; ; Input: bp+6 ;far pointer to 'dest' string ; bp+10 ;far pointer to 'src' string ; ; Output: none ; ; Date Initials Rev Comments ; ----------------------------------------------------------------------- ; 09-27-94 acp 01 initial creation ; ;------------------------------------------------------------------------------ ; public _fstrcpy _fstrcpy proc far push bp ;save application stack offset pointer mov bp,sp ;load current stack point ; ; save regs ; push ds push es push si push di ; ; access arguments es:di = 'dest' ds:si = 'src' ; mov ax,word ptr [bp+8] ;segment to dest mov es,ax mov di,word ptr [bp+6] ;offset to dest mov ax,word ptr [bp+12] ;segment to src mov ds,ax mov si,word ptr [bp+10] ;offset to src ; ; copy src bytes to dest location until a NULL is copied ; fsc1: movsb ;copy byte cmp byte ptr [si],0 ;check for NULL jnz fsc1 ;go again if no NULL found ; ; restore regs ; pop di pop si pop es pop ds pop bp ret _fstrcpy endp ;------------------------------------------------------------------------------ ; _GetIntVect() Alan Partis ; Copyright (C) AP MicroSystems, Inc. ; 1994 - All rights reserved ; ; Description: Retrieves a given interrupt vector value via DOS services. ; ; Input: bp+6 word hex vector to retrieve ; ; Output: ax offset of retrieved vector ; dx segment address of retrieved vector ; ; Date Initials Rev Comments ; ----------------------------------------------------------------------- ; 09-30-94 acp 01 initial creation ; ;------------------------------------------------------------------------------ ; public _GetIntVect _GetIntVect proc far push bp ;access stacked args mov bp,sp ; ; save affected regs ; push bx push es ; ; get vector ; mov ax,[bp+6] mov ah,GET_INT_VECT int 21h ; ; set up return value ; mov dx,es mov ax,bx ; ; restore regs ; pop es pop bx pop bp ;reset stack frame retf _GetIntVect endp ;------------------------------------------------------------------------------ ; _GetDOSVer Alan Partis ; Copyright (C) AP MicroSystems, Inc. ; 1993 - All rights reserved ; ; Description: Updates two global variables (_osmajor & _osminor) with the ; REAL DOS ver (not masked with SETVER). ; ; Input: none ; ; Output: ax 0 = DOS 5.0 or greater ; 1 = prior DOS version ; ; Date Initials Rev Comments ; ----------------------------------------------------------------------- ; 08-21-94 acp 01 initial creation ; ;------------------------------------------------------------------------------ ; extrn __osmajor:byte extrn __osminor:byte public _GetDOSVer _GetDOSVer proc far ; ; save regs ; push bx push dx ; ; get DOS version - first check the documented ; version, but since this can be overridden by ; SETVER, we'll possibly override this with the ; results from the undocumented version. ; xor ax,ax ;clear return values xor bx,bx mov ah,GET_DOS_VER int 21h mov __osmajor,al ;save results mov __osminor,ah mov ax,GET_REAL_DOS xor bx,bx ;preset - if 0 on return do nothing int 21h cmp bx,0 ;if 0, function is unsupported je gdv1 mov __osmajor,bl ;override with real DOS version mov __osminor,bh xor ax,ax ;DOS version 5.0 or later jmp gdvx gdv1: mov ax,0001h ;DOS version pre-5.0 ; ; restore regs and get outta Dodge ; gdvx: pop dx pop bx retf _GetDOSVer endp ;------------------------------------------------------------------------------ ; _HexDump Alan Partis ; Copyright (C) AP MicroSystems, Inc. ; 1993 - All rights reserved ; ; Description: Outputs a block of raw bytes in hex format as specified ; by the input parameters to the console for diagnostics ; ; Input: bp+6 ;4 byte pointer to data ; bp+10 ;size of data ; ; Output: none ; ; Date Initials Rev Comments ; ----------------------------------------------------------------------- ; 05-20-93 acp 01 initial creation ; ;------------------------------------------------------------------------------ ; public _HexDump _HexDump proc far push bp ;save application stack offset pointer mov bp,sp ;load current stack point ; ;save registers ; push ax push bx push cx push dx push es ; ;get parameters ; mov ax,word ptr [bp+8] ;segment to data mov es,ax mov bx,word ptr [bp+6] ;offset to data mov cx,[bp+10] ;count ; ;print address first ; mov ax,es mov dl,ah call PrintXByte mov dl,al call PrintXByte PRINTC COLON mov dl,bh call PrintXByte mov dl,bl call PrintXByte PRINTC SPACE PRINTC SPACE ; ;display byte ; hd1: mov dl,byte ptr es:[bx] ;byte to display call PrintXByte ; ;output a space ; PRINTC SPACE ; ;update pointer and loop ; inc bx loop hd1 ; ;put out cr/lf and return ; PRINTC CR PRINTC LF ; ;exit back to caller ; pop es pop dx pop cx pop bx pop ax pop bp ret _HexDump endp ;------------------------------------------------------------------------------ ; PrintXByte Alan Partis ; Copyright (C) AP MicroSystems, Inc. ; 1993 - All rights reserved ; ; Description: Displays a given hexidecimal byte to the console ; ; Input: dl ;byte to display ; ; Output: none ; ; Date Initials Rev Comments ; ----------------------------------------------------------------------- ; 08-20-94 acp 01 initial creation ; ;------------------------------------------------------------------------------ ; ASCII db 30h, 31h, 32h, 33h, 34h, 35h, 36h, 37h db 38h, 39h, 41h, 42h, 43h, 44h, 45h, 46h PrintXByte proc near push bx mov al,dl ;get entire byte lea bx,ASCII ;get pointer to translation table and ax,00f0h ;isolate high nibble shr ax,4 ;move high nibble to low nibble xlat ASCII ;convert to ASCII PRINTC al ; ;low nibble ; mov al,dl ;get entire byte lea bx,ASCII ;get pointer to translation table and ax, 000fh ;isolate low nibble xlat ASCII ;convert to ASCII PRINTC al pop bx ret PrintXByte endp ;------------------------------------------------------------------------------ ; _SetIntVect() Alan Partis ; Copyright (C) AP MicroSystems, Inc. ; 1994 - All rights reserved ; ; Description: Sets a given interrupt vector value via DOS services. ; ; Input: bp+6 word hex vector to retrieve ; bp+8 offset of new ISR ; bp+10 segment of new ISR ; ; Output: none ; ; Date Initials Rev Comments ; ----------------------------------------------------------------------- ; 09-30-94 acp 01 initial creation ; ;------------------------------------------------------------------------------ ; public _SetIntVect _SetIntVect proc far push bp ;access stacked args mov bp,sp ; ; save affected regs ; push dx push ds ; ; get ISR pointer and interrupt number ; mov ax,[bp+10] mov ds,ax mov dx,[bp+8] mov ax,[bp+6] mov ah,SET_INT_VECT int 21h ; ; restore regs ; pop ds pop dx pop bp ;reset stack frame retf _SetIntVect endp ;------------------------------------------------------------------------------ ; _StrDump Alan Partis ; Copyright (C) AP MicroSystems, Inc. ; 1993 - All rights reserved ; ; Description: Outputs a block of characters as specified ; by the input parameters to the console for diagnostics ; ; Input: bp+6 ;4 byte pointer to data ; bp+10 ;size of data ; ; Output: none ; ; Date Initials Rev Comments ; ----------------------------------------------------------------------- ; 05-20-93 acp 01 initial creation ; ;------------------------------------------------------------------------------ ; public _StrDump _StrDump proc far push bp ;save application stack offset pointer mov bp,sp ;load current stack point ; ;save registers ; push ax push bx push cx push dx push es ; ;get parameters ; mov ax,word ptr [bp+8] ;segment to data mov es,ax mov bx,word ptr [bp+6] ;offset to data mov cx,[bp+10] ;count ; ;display byte ; sd1: PRINTC [es:bx] ; ;update pointer and loop ; inc bx loop sd1 ; ;put out cr/lf and return ; PRINTC CR PRINTC LF ; ;exit back to caller ; pop es pop dx pop cx pop bx pop ax pop bp ret _StrDump endp ;------------------------------------------------------------------------------ ; __StrDump Alan Partis ; Copyright (C) AP MicroSystems, Inc. ; 1994 - All rights reserved ; ; Description: Outputs a block of characters via ROM BIOS as specified ; by the input parameters to the console for diagnostics ; ; Input: bp+6 ;4 byte pointer to data ; bp+10 ;size of data ; ; Output: none ; ; Date Initials Rev Comments ; ----------------------------------------------------------------------- ; 09-27-94 acp 01 initial creation ; ;------------------------------------------------------------------------------ ; public __StrDump __StrDump proc far push bp ;save application stack offset pointer mov bp,sp ;load current stack point ; ;save registers ; push ax push bx push cx push dx push es ; ;get parameters ; mov ax,word ptr [bp+8] ;segment to data mov es,ax mov bx,word ptr [bp+6] ;offset to data mov cx,[bp+10] ;count ; ;display byte ; _sd1: PRINTC_B [es:bx] ; ;update pointer and loop ; inc bx loop _sd1 ; ;put out cr/lf and return ; PRINTC_B CR PRINTC_B LF ; ;exit back to caller ; pop es pop dx pop cx pop bx pop ax pop bp ret __StrDump endp _ASMTOOLS ends end
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