CD Shareware Magazine 1996 December

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Text File | 1996-09-01 | 71.7 KB | 2,724 lines

~~~C_STR1 Ideal Public strlen,strcpy,strcat,strcmp Model Tiny CodeSeg P386 ;****************** strlen() -- Get length of string ;int strlen(char *strp); strp equ bp+4 Proc strlen push bp ;Set up stack frame mov bp,sp push si ;Save SI mov si,[strp] ;SI = string pointer p1_loop: lodsb ;Load char test al,al ;Loop while not zero jnz p1_loop sub si,[strp] ;AX = length dec si xchg ax,si pop si ;Restore SI pop bp ;Delete stack frame ret 2 ;Return EndP strlen ;****************** strcpy() -- Copy a string ;void strcpy(char *str1, char *str2); str1 equ bp+6 str2 equ bp+4 Proc strcpy push bp ;Set up stack frame mov bp,sp pusha ;Save all registers mov si,[str2] ;SI = source mov di,[str1] ;DI = destination p2_loop: lodsb ;Load char mov [di],al ;Store char inc di test al,al ;Loop while not zero jnz p2_loop popa ;Restore registers pop bp ;Delete stack frame ret 4 ;Return EndP strcpy ;****************** strcat() -- Concatenate strings ;void strcat(char *str1, char *str2); str1 equ bp+6 str2 equ bp+4 Proc strcat push bp ;Set up stack frame mov bp,sp pusha ;Save all registers mov si,[str1] ;SI = destination p3_cloop: lodsb ;Load char test al,al ;Loop while not zero jnz p3_cloop mov di,si ;DI = destination mov si,[str2] ;SI = source dec di p3_loop: lodsb ;Load char mov [di],al ;Store char inc di test al,al ;Loop while not zero jnz p3_loop popa ;Restore registers pop bp ;Delete stack frame ret 4 ;Return EndP strcat ;****************** strcmp() -- Compare strings ;void strcmp(char *str1, char *str2); str1 equ bp+6 str2 equ bp+4 Proc strcmp push bp ;Set up stack frame mov bp,sp push si di ;Save registers mov si,[str1] ;SI = source mov di,[str2] ;DI = destination p4_loop: lodsb ;Load char 1 mov ah,[di] ;Load char 2 inc di cmp al,ah ;Not equal? jne p4_nope test al,al ;Loop while not zero jnz p4_loop xor ax,ax ;Equal, return 0 p4_done: pop di si ;Restore registers pop bp ;Delete stack frame ret 4 ;Return p4_nope: sub al,ah ;Not equal, return difference cbw ;in first unequal position jmp p4_done EndP strcmp End ~~~C_STR2 Ideal Extrn strlen:near Public strchr,strstr Model Tiny CodeSeg P386 ;****************** strchr() -- Search string for char ;int strchr(char *strp, int chr); strp equ bp+6 chr equ bp+4 Proc strchr push bp ;Set up stack frame mov bp,sp push si ;Save SI mov si,[strp] ;SI = string pointer mov ah,[chr] ;AH = char p1_loop: lodsb ;Load char test al,al ;Null, not found jz p1_nope cmp al,ah ;Loop while not equal jne p1_loop sub si,[strp] ;AX = position of char dec si xchg ax,si p1_done: pop si ;Restore SI pop bp ;Delete stack frame ret 4 ;Return p1_nope: mov ax,-1 ;Not found, return -1 jmp p1_done EndP strchr ;****************** strstr() -- Search string for substring ;int strstr(char *strp, char *subp); strp equ bp+6 subp equ bp+4 Proc strstr push bp ;Set up stack frame mov bp,sp pusha ;Save all registers push es push ds ;ES = DS pop es mov si,[strp] ;SI = string pointer mov bx,[subp] ;BX = substring pointer push bx ;Get length of substring call strlen ;into DX xchg dx,ax mov ah,[bx] ;AH = first char p3_loop: lodsb ;Load char test al,al ;Null, not found jz p3_nope cmp al,ah ;Loop while not equal jne p3_loop mov cx,dx ;CX = length mov di,bx ;DI = substring push si ;Save SI dec si ;Push back char repe cmpsb ;Compare strings pop si ;Restore SI jne p3_loop ;Loop if not equal sub si,[strp] ;AX = position of char dec si p3_done: mov [bp-2],si ;Change pushed AX pop es ;Restore registers popa pop bp ;Delete stack frame ret 4 ;Return p3_nope: mov si,-1 ;Not found, return -1 jmp p3_done EndP strstr End ~~~C_STR3 Ideal Public stricmp,strlwr,strupr Model Tiny CodeSeg P386 ;****************** stricmp() -- Compare strings, case insensitive ;void stricmp(char *str1, char *str2); str1 equ bp+6 str2 equ bp+4 Proc stricmp push bp ;Set up stack frame mov bp,sp push si di ;Save registers mov si,[str1] ;SI = source mov di,[str2] ;DI = destination p1_loop: lodsb ;Load char 1 mov ah,[di] ;Load char 2 inc di cmp al,'a' ;Convert AL to uppercase jb p1_setAH cmp al,'z' ja p1_setAH sub al,20h p1_setAH: cmp ah,'a' ;Convert AH to uppercase jb p1_comp cmp ah,'z' ja p1_comp sub ah,20h p1_comp: cmp al,ah ;Equal? jne p1_nope test al,al ;Loop while not zero jnz p1_loop inc ax ;Equal, return 1 p1_done: pop di si ;Restore registers pop bp ;Delete stack frame ret 4 ;Return p1_nope: xor ax,ax ;Not equal, return 0 jmp p1_done EndP stricmp ;****************** strlwr() -- Convert string to lowercase ;int strlwr(char *strp); strp equ bp+4 Proc strlwr push bp ;Set up stack frame mov bp,sp pusha ;Save registers mov si,[strp] ;SI = string pointer p2_loop: lodsb ;Load char test al,al ;Check for null jz p2_done cmp al,'A' ;Check for uppercase jb p2_loop cmp al,'Z' ja p2_loop add al,20h ;Convert to lowercase mov [si-1],al ;Store char jmp p2_loop p2_done: popa ;Restore registers pop bp ;Delete stack frame ret 2 ;Return EndP strlwr ;****************** strupr() -- Convert string to uppercase ;int strupr(char *strp); strp equ bp+4 Proc strupr push bp ;Set up stack frame mov bp,sp pusha ;Save registers mov si,[strp] ;SI = string pointer p3_loop: lodsb ;Load char test al,al ;Check for null jz p3_done cmp al,'a' ;Check for lowercase jb p3_loop cmp al,'z' ja p3_loop sub al,20h ;Convert to uppercase mov [si-1],al ;Store char jmp p3_loop p3_done: popa ;Restore registers pop bp ;Delete stack frame ret 2 ;Return EndP strupr End ~~~C_STR4 Ideal Public strrtrim,strltrim Model Tiny CodeSeg P386 ;****************** strrtrim() -- Trim trailing spaces off a string ;int strrtrim(char *strp); strp equ bp+4 Proc strrtrim push bp ;Set up stack frame mov bp,sp pusha ;Save registers mov si,[strp] ;SI = string pointer mov di,si ;DI = SI p1_loop: lodsb ;Load char test al,al ;Check for null jz p1_done cmp al,' ' ;Check for space je p1_loop mov di,si ;Set pointer jmp p1_loop p1_done: mov [byte di+1],al ;Terminate string popa ;Restore registers pop bp ;Delete stack frame ret 2 ;Return EndP strrtrim ;****************** strltrim() -- Trim leading spaces off a string ;int strltrim(char *strp); strp equ bp+4 Proc strltrim push bp ;Set up stack frame mov bp,sp pusha ;Save registers mov si,[strp] ;SI, DI = string pointer mov di,si p2_loop: lodsb ;Load char test al,al ;Check for null jz p2_cont cmp al,' ' ;Loop while space je p2_loop p2_cont: dec si ;Move back one char cmp si,di ;No spaces, quit je p2_done p2_cloop: lodsb ;Shift the string over mov [di],al inc di test al,al jnz p2_cloop p2_done: popa ;Restore registers pop bp ;Delete stack frame ret 2 ;Return EndP strltrim End ~~~C_MEM1 Ideal Public memcpy,memset Model Tiny CodeSeg P386 ;****************** memcpy() -- Copy memory block ;void memcpy(void *p1, void *p2, int nbytes); p1 equ bp+8 p2 equ bp+6 nbytes equ bp+4 Proc memcpy push bp ;Set up stack frame mov bp,sp push es ;Save registers pusha push ds ;ES = DS pop es mov si,[p2] ;SI = source mov di,[p1] ;DI = destination mov cx,[nbytes] ;CX = count cmp di,si ;Make forward moves jb p1_go ;in reverse je p1_done std ;Set direction flag add si,cx ;Move offsets to end add di,cx dec si dec di p1_go: rep movsb ;Copy memory p1_done: cld ;Clear direction flag popa ;Restore registers pop es pop bp ;Delete stack frame ret 6 ;Return EndP memcpy ;****************** memset() -- Set memory block ;void memset(void *ptr, int nbytes, int chr); ptr equ bp+8 nbytes equ bp+6 chr equ bp+4 Proc memset push bp ;Set up stack frame mov bp,sp push es ;Save registers pusha push ds ;ES = DS pop es mov di,[ptr] ;DI = block mov cx,[nbytes] ;CX = count mov al,[chr] ;AL = char rep stosb ;Set memory popa ;Restore registers pop es pop bp ;Delete stack frame ret 6 ;Return EndP memset End ~~~C_MEM2 Ideal Public memcmp,memchr Model Tiny CodeSeg P386 ;****************** memcmp() -- Compare memory blocks ;void memcmp(void *p1, void *p2, int nbytes); p1 equ bp+8 p2 equ bp+6 nbytes equ bp+4 Proc memcmp push bp ;Set up stack frame mov bp,sp push es ;Save registers push cx si di push ds ;ES = DS pop es mov si,[p2] ;SI = source mov di,[p1] ;DI = destination mov cx,[nbytes] ;CX = count repe cmpsb ;Compare memory mov ax,1 ;Assume equal je p1_done ;Jump if equal xor ax,ax ;Not equal, return 0 p1_done: pop di si cx ;Restore registers pop es pop bp ;Delete stack frame ret 6 ;Return EndP memcmp ;****************** memchr() -- Scan memory for char ;void memchr(void *ptr, int nbytes, int chr); ptr equ bp+8 nbytes equ bp+6 chr equ bp+4 Proc memchr push bp ;Set up stack frame mov bp,sp push es ;Save registers push cx si di push ds ;ES = DS pop es mov di,[ptr] ;DI = block mov cx,[nbytes] ;CX = count mov al,[chr] ;AL = char repne scasb ;Scan memory jne p2_nope ;Jump if not found sub di,[ptr] ;AX = position of char dec di xchg ax,di p2_done: pop di si cx ;Restore registers pop es pop bp ;Delete stack frame ret 6 ;Return p2_nope: mov ax,-1 ;Not found, return -1 jmp p2_done EndP memchr End ~~~C_ISRCH Ideal Public isearch Model Tiny P386 CodeSeg ;****************** isearch() -- Search a sorted array of integers ;int isearch(int *ary, int size, int elem); ary equ bp+8 size equ bp+6 elem equ bp+4 Proc isearch push bp ;Set up stack frame mov bp,sp push bx cx dx si di ;Save registers mov bx,[ary] ;BX = array xor cx,cx ;CX = lower limit mov dx,[size] ;DX = upper limit dec dx p1_loop: mov si,cx ;SI = middle element add si,dx shr si,1 add si,si mov ax,[bx+si] ;Get element shr si,1 ;Fix SI cmp ax,[elem] ;Check element je p1_found ;Equal? jl p1_less ;Too low? p1_greater: mov di,si ;Set first half mov si,cx jmp p1_cont p1_less: mov di,dx ;Set second half inc si p1_cont: cmp cx,dx ;Min = Max, done je p1_nope mov cx,si ;Set limits mov dx,di jmp p1_loop ;Loop back p1_found: xchg ax,si ;AX = result p1_done: pop di si dx cx bx ;Restore registers pop bp ;Delete stack frame ret 6 ;Return p1_nope: mov ax,-1 ;Not found, return -1 jmp p1_done EndP isearch End ~~~C_LSRCH Ideal Public lsearch Model Tiny P386 CodeSeg ;****************** lsearch() -- Search a sorted array of longs ;int lsearch(long *ary, int size, long elem); ary equ bp+10 size equ bp+8 elem equ bp+4 Proc lsearch push bp ;Set up stack frame mov bp,sp push es ;Save registers pushad mov bx,[ary] ;BX = array xor cx,cx ;CX = lower limit mov dx,[size] ;DX = upper limit dec dx p1_loop: mov si,cx ;SI = middle element add si,dx shr si,1 shl si,2 mov eax,[bx+si] ;Get element shr si,2 ;Fix SI cmp eax,[elem] ;Check element je p1_done ;Equal? jl p1_less ;Too low? p1_greater: mov di,si ;Set first half mov si,cx jmp p1_cont p1_less: mov di,dx ;Set second half inc si p1_cont: cmp cx,dx ;Min = Max, done je p1_nope mov cx,si ;Set limits mov dx,di jmp p1_loop ;Loop back p1_done: mov es,si ;ES = result popad ;Restore registers mov ax,es ;AX = result pop es ;Restore ES pop bp ;Delete stack frame ret 8 ;Return p1_nope: mov si,-1 ;Not found, return -1 jmp p1_done EndP lsearch End ~~~C_XSRCH Ideal Public xsearch Model Tiny P386 CodeSeg ;****************** xsearch() -- Search sorted array, generalized ;int xsearch(void **ary, int size, void *elem, void *func); ary equ bp+10 size equ bp+8 elem equ bp+6 func equ bp+4 Proc xsearch push bp ;Set up stack frame mov bp,sp push bx cx dx si di ;Save registers mov bx,[ary] ;BX = array xor cx,cx ;CX = lower limit mov dx,[size] ;DX = upper limit dec dx p3_loop: mov si,cx ;SI = middle element add si,dx shr si,1 add si,si mov ax,[bx+si] ;Get element shr si,1 ;Fix SI push ax [word elem] ;Check element call [word func] test ax,ax je p3_found ;Equal? jl p3_less ;Too low? p3_greater: mov di,si ;Set first half mov si,cx jmp p3_cont p3_less: mov di,dx ;Set second half inc si p3_cont: cmp cx,dx ;Min = Max, done je p3_nope mov cx,si ;Set limits mov dx,di jmp p3_loop ;Loop back p3_found: xchg ax,si ;AX = result p3_done: pop di si dx cx bx ;Restore registers pop bp ;Delete stack frame ret 8 ;Return p3_nope: mov ax,-1 ;Not found, return -1 jmp p3_done EndP xsearch End ~~~C_SSRCH Ideal Extrn strcmp:near Public ssearch Model Tiny P386 CodeSeg ;****************** ssearch() -- Search a sorted array of strings ;int ssearch(char **ary, int size, char *elem); ary equ bp+8 size equ bp+6 elem equ bp+4 Proc ssearch push bp ;Set up stack frame mov bp,sp push bx cx dx si di ;Save registers mov bx,[ary] ;BX = array xor cx,cx ;CX = lower limit mov dx,[size] ;DX = upper limit dec dx p1_loop: mov si,cx ;SI = middle element add si,dx shr si,1 add si,si mov ax,[bx+si] ;Get element shr si,1 ;Fix SI push ax [word elem] ;Check element call strcmp test ax,ax je p1_found ;Equal? jl p1_less ;Too low? p1_greater: mov di,si ;Set first half mov si,cx jmp p1_cont p1_less: mov di,dx ;Set second half inc si p1_cont: cmp cx,dx ;Min = Max, done je p1_nope mov cx,si ;Set limits mov dx,di dec di jmp p1_loop ;Loop back p1_found: xchg ax,si ;AX = result p1_done: pop di si dx cx bx ;Restore registers pop bp ;Delete stack frame ret 6 ;Return p1_nope: mov ax,-1 ;Not found, return -1 jmp p1_done EndP ssearch End ~~~C_ISORT Ideal Public isort Model Tiny P386 CodeSeg ;****************** isort() -- Sort an array of integers ;void isort(int *ary, int size); ary equ bp+6 max equ bp+4 Proc isort push bp ;Set up stack frame mov bp,sp pusha ;Save all registers mov bx,[ary] ;Call recursive routine xor cx,cx mov dx,[max] dec dx add dx,dx call p1_qsort popa ;Restore registers pop bp ;Delete stack frame ret 4 ;Return p1_qsort: cmp cx,dx ;One element, return je p1_ret pusha mov ax,dx ;Two elements, sort them sub ax,cx cmp ax,2 jne p1_cont mov si,cx ;SI, DI = low, high mov di,dx mov ax,[bx+si] ;Check them cmp ax,[bx+di] jle p1_done xchg ax,[bx+di] ;Switch them mov [bx+si],ax jmp p1_done p1_cont: mov si,cx ;AX = middle element add si,dx shr si,2 add si,si mov ax,[bx+si] mov si,cx ;SI = low, DI = high mov di,dx p1_loop: cmp si,dx ;While [BX+SI] < AX and jge p1_loop2 ; SI < DX, advance SI cmp ax,[bx+si] jle p1_loop2 add si,2 jmp p1_loop p1_loop2: cmp di,cx ;While [BX+DI] > AX and jle p1_cont2 ; DI > CX, advance DI cmp ax,[bx+di] jge p1_cont2 sub di,2 jmp p1_loop2 p1_cont2: cmp si,di ;Hit in middle, recurse jge p1_rec push [word bx+si] ;Swap elements push [word bx+di] pop [word bx+si] pop [word bx+di] add si,2 ;Advance SI, DI sub di,2 jmp p1_loop ;Loop back p1_rec: cmp cx,si ;If first half isn't empty, je p1_skip1 ;recurse to sort it xchg dx,di call p1_qsort xchg dx,di p1_skip1: cmp dx,di ;If second half isn't empty, je p1_done ;recurse to sort it xchg cx,si call p1_qsort xchg cx,si p1_done: popa ;Restore registers p1_ret: ret ;Return EndP isort End ~~~C_LSORT Ideal Public lsort Model Tiny P386 CodeSeg ;****************** lsort() -- Sort an array of longs ;void lsort(long *ary, int size); ary equ bp+6 max equ bp+4 num equ bp-4 Proc lsort push bp ;Set up stack frame mov bp,sp pushad ;Save all registers mov bx,[ary] ;Call recursive routine xor cx,cx mov dx,[max] dec dx shl dx,2 call p1_qsort popad ;Restore registers pop bp ;Delete stack frame ret 4 ;Return p1_qsort: cmp cx,dx ;One element, return je p1_ret pusha mov ax,dx ;Two elements, sort them sub ax,cx cmp ax,4 jne p1_cont mov si,cx ;SI, DI = low, high mov di,dx mov eax,[bx+si] ;Check them cmp eax,[bx+di] jle p1_done xchg eax,[bx+di] ;Switch them mov [bx+si],eax jmp p1_done p1_cont: mov si,cx ;AX = middle element add si,dx shr si,3 shl si,2 mov eax,[bx+si] mov si,cx ;SI = low, DI = high mov di,dx p1_loop: cmp si,dx ;While [BX+SI] < EAX and jge p1_loop2 ; SI < DX, advance SI cmp eax,[bx+si] jle p1_loop2 add si,4 jmp p1_loop p1_loop2: cmp di,cx ;While [BX+DI] > EAX and jle p1_cont2 ; DI > CX, advance DI cmp eax,[bx+di] jge p1_cont2 sub di,4 jmp p1_loop2 p1_cont2: cmp si,di ;Hit in middle, recurse jge p1_rec push [dword bx+si] ;Swap elements push [dword bx+di] pop [dword bx+si] pop [dword bx+di] add si,4 ;Advance SI, DI sub di,4 jmp p1_loop ;Loop back p1_rec: cmp cx,si ;If first half isn't empty, je p1_skip1 ;recurse to sort it xchg dx,di call p1_qsort xchg dx,di p1_skip1: cmp dx,di ;If second half isn't empty, je p1_done ;recurse to sort it xchg cx,si call p1_qsort xchg cx,si p1_done: popa ;Restore registers p1_ret: ret ;Return EndP lsort End ~~~C_SSORT Ideal Extrn strcmp:near Public ssort Model Tiny P386 CodeSeg ;****************** ssort() -- Sort an array of strings ;void ssort(char **ary, int size); ary equ bp+6 max equ bp+4 Proc ssort push bp ;Set up stack frame mov bp,sp pusha ;Save all registers mov bx,[ary] ;Call recursive routine xor cx,cx mov dx,[max] dec dx add dx,dx call p1_qsort popa ;Restore registers pop bp ;Delete stack frame ret 4 ;Return p1_qsort: cmp cx,dx ;One element, return jne $+3 ret pusha mov ax,dx ;Two elements, sort them sub ax,cx cmp ax,2 jne p1_cont mov si,cx ;SI, DI = low, high mov di,dx mov ax,[bx+si] ;Check them push ax [word bx+di] call strcmp test ax,ax jle p1_done push [word bx+si] ;Switch them push [word bx+di] pop [word bx+si] pop [word bx+di] jmp p1_done p1_cont: mov si,cx ;AX = middle element add si,dx shr si,2 add si,si mov ax,[bx+si] mov si,cx ;SI = low, DI = high mov di,dx p1_loop: cmp si,dx ;While [BX+SI] < AX and jge p1_loop2 ; SI < DX, advance SI push ax ax [word bx+si] call strcmp pop ax jle p1_loop2 add si,2 jmp p1_loop p1_loop2: cmp di,cx ;While [BX+DI] > AX and jle p1_cont2 ; DI > CX, advance DI push ax ax [word bx+di] call strcmp pop ax jge p1_cont2 sub di,2 jmp p1_loop2 p1_cont2: cmp si,di ;Hit in middle, recurse jge p1_rec push [word bx+si] ;Swap elements push [word bx+di] pop [word bx+si] pop [word bx+di] add si,2 ;Advance SI, DI sub di,2 jmp p1_loop ;Loop back p1_rec: cmp cx,si ;If first half isn't empty, je p1_skip1 ;recurse to sort it xchg dx,di call p1_qsort xchg dx,di p1_skip1: cmp dx,di ;If second half isn't empty, je p1_done ;recurse to sort it xchg cx,si call p1_qsort xchg cx,si p1_done: popa ;Restore registers p1_ret: ret ;Return EndP ssort End ~~~C_XSORT Ideal Public xsort Model Tiny P386 CodeSeg ;****************** xsort() -- Sort array, generalized ;void xsort(void **ary, int size, void *func); ary equ bp+8 max equ bp+6 func equ bp+4 Proc xsort push bp ;Set up stack frame mov bp,sp pusha ;Save all registers mov bx,[ary] ;Call recursive routine xor cx,cx mov dx,[max] dec dx add dx,dx call p1_qsort popa ;Restore registers pop bp ;Delete stack frame ret 4 ;Return p1_qsort: cmp cx,dx ;One element, return jne $+3 ret pusha mov ax,dx ;Two elements, sort them sub ax,cx cmp ax,2 jne p1_cont mov si,cx ;SI, DI = low, high mov di,dx mov ax,[bx+si] ;Check them push ax [word bx+di] call [word func] test ax,ax jle p1_done push [word bx+si] ;Switch them push [word bx+di] pop [word bx+si] pop [word bx+di] jmp p1_done p1_cont: mov si,cx ;AX = middle element add si,dx shr si,2 add si,si mov ax,[bx+si] mov si,cx ;SI = low, DI = high mov di,dx p1_loop: cmp si,dx ;While [BX+SI] < AX and jge p1_loop2 ; SI < DX, advance SI push ax ax [word bx+si] call [word func] pop ax jle p1_loop2 add si,2 jmp p1_loop p1_loop2: cmp di,cx ;While [BX+DI] > AX and jle p1_cont2 ; DI > CX, advance DI push ax ax [word bx+di] call [word func] pop ax jge p1_cont2 sub di,2 jmp p1_loop2 p1_cont2: cmp si,di ;Hit in middle, recurse jge p1_rec push [word bx+si] ;Swap elements push [word bx+di] pop [word bx+si] pop [word bx+di] add si,2 ;Advance SI, DI sub di,2 jmp p1_loop ;Loop back p1_rec: cmp cx,si ;If first half isn't empty, je p1_skip1 ;recurse to sort it xchg dx,di call p1_qsort xchg dx,di p1_skip1: cmp dx,di ;If second half isn't empty, je p1_done ;recurse to sort it xchg cx,si call p1_qsort xchg cx,si p1_done: popa ;Restore registers p1_ret: ret ;Return EndP xsort End ~~~C_LSHL Ideal Public lshl Model Tiny CodeSeg P386 ;****************** lshl() -- Shift long integer to the left ;long lshl(long x, int d); Included for compatibility. x equ bp+6 d equ bp+4 Proc lshl push bp ;Set up stack frame mov bp,sp push ebx cx ;Save registers mov ebx,[x] ;EBX = x mov cl,[d] ;CL = distance shl ebx,cl ;Shift left xchg ax,bx ;DX:AX = result shr ebx,16 mov dx,bx pop cx ebx ;Restore registers pop bp ;Delete stack frame ret 6 ;Return EndP lshl End ~~~C_LSHR Ideal Public lshr Model Tiny CodeSeg P386 ;****************** lshr() -- Shift long integer to the right ;long lshr(long x, int d); Included for compatibility. x equ bp+6 d equ bp+4 Proc lshr push bp ;Set up stack frame mov bp,sp push ebx cx ;Save registers mov ebx,[x] ;EBX = x mov cl,[d] ;CL = distance shr ebx,cl ;Shift right xchg ax,bx ;DX:AX = result shr ebx,16 mov dx,bx pop cx ebx ;Restore registers pop bp ;Delete stack frame ret 6 ;Return EndP lshr End ~~~C_LSAR Ideal Public lsar Model Tiny CodeSeg P386 ;****************** lsar() -- Shift long integer to the right, signed ;long lsar(long x, int d); Included for compatibility. x equ bp+6 d equ bp+4 Proc lsar push bp ;Set up stack frame mov bp,sp push ebx cx ;Save registers mov ebx,[x] ;EBX = x mov cl,[d] ;CL = distance sar ebx,cl ;Shift right, signed xchg ax,bx ;DX:AX = result shr ebx,16 mov dx,bx pop cx ebx ;Restore registers pop bp ;Delete stack frame ret 6 ;Return EndP lsar End ~~~C_LMUL Ideal Public lmul Model Tiny CodeSeg P386 ;****************** lmul() -- Multiply long integers ;long lmul(long x, long y); Included for compatibility. x equ bp+8 y equ bp+4 Proc lmul push bp ;Set up stack frame mov bp,sp push ebx ;Save registers mov ebx,[x] ;EBX = x * y imul ebx,[y] xchg ax,bx ;DX:AX = result shr ebx,16 mov dx,bx pop ebx ;Restore registers pop bp ;Delete stack frame ret 8 ;Return EndP lmul End ~~~C_LIMUL Ideal Public limul Model Tiny CodeSeg P386 ;****************** limul() -- Multiply long integers, signed ;long limul(long x, long y); Included for compatibility x equ bp+8 y equ bp+4 Proc limul push bp ;Set up stack frame mov bp,sp push ebx ;Save registers mov ebx,[x] ;EBX = x * y imul ebx,[y] xchg ax,bx ;DX:AX = result shr ebx,16 mov dx,bx pop ebx ;Restore registers pop bp ;Delete stack frame ret 8 ;Return EndP limul End ~~~C_LDIV Ideal Public ldiv Model Tiny CodeSeg P386 ;****************** ldiv() -- Divide long integers ;long ldiv(long x, long y); Included for compatibility. x equ bp+8 y equ bp+4 Proc ldiv push bp ;Set up stack frame mov bp,sp push ebx ecx esi ;Save registers mov ecx,edx ;Save EDX:EAX xchg ebx,eax mov eax,[x] ;EAX = x / y mov esi,[y] xor edx,edx div esi mov edx,ecx ;Restore EDX:EAX xchg ebx,eax xchg ax,bx ;DX:AX = result shr ebx,16 mov dx,bx pop esi ecx ebx ;Restore registers pop bp ;Delete stack frame ret 8 ;Return EndP ldiv End ~~~C_LIDIV Ideal Public lidiv Model Tiny CodeSeg P386 ;****************** lidiv() -- Divide long integers, signed ;long lidiv(long x, long y); Included for compatibility. x equ bp+8 y equ bp+4 Proc lidiv push bp ;Set up stack frame mov bp,sp push ebx ecx esi ;Save registers mov ecx,edx ;Save EDX:EAX xchg ebx,eax mov eax,[x] ;EAX = x / y mov esi,[y] cdq idiv esi mov edx,ecx ;Restore EDX:EAX xchg ebx,eax xchg ax,bx ;DX:AX = result shr ebx,16 mov dx,bx pop esi ecx ebx ;Restore registers pop bp ;Delete stack frame ret 8 ;Return EndP lidiv End ~~~C_LMOD Ideal Public lmod Model Tiny CodeSeg P386 ;****************** lmod() -- Modulo on long integers ;long lmod(long x, long y); Included for compatibility. x equ bp+8 y equ bp+4 Proc lmod push bp ;Set up stack frame mov bp,sp push ebx ecx esi ;Save registers mov ecx,edx ;Save EDX:EAX xchg ebx,eax mov eax,[x] ;EAX = x / y mov esi,[y] xor edx,edx div esi xchg edx,ecx ;Restore EDX:EAX xchg ebx,eax xchg ax,cx ;DX:AX = result shr ecx,16 mov dx,cx pop esi ecx ebx ;Restore registers pop bp ;Delete stack frame ret 8 ;Return EndP lmod End ~~~C_LIMOD Ideal Public limod Model Tiny CodeSeg P386 ;****************** limod() -- Modulo on long integers, signed ;long limod(long x, long y); Included for compatibility. x equ bp+8 y equ bp+4 Proc limod push bp ;Set up stack frame mov bp,sp push ebx ecx esi ;Save registers mov ecx,edx ;Save EDX:EAX xchg ebx,eax mov eax,[x] ;EAX = x / y mov esi,[y] cdq idiv esi xchg edx,ecx ;Restore EDX:EAX xchg ebx,eax xchg ax,cx ;DX:AX = result shr ecx,16 mov dx,cx pop esi ecx ebx ;Restore registers pop bp ;Delete stack frame ret 8 ;Return EndP limod End ~~~C_FIXMUL Ideal Public fixmul Model Tiny CodeSeg P386 ;****************** fixmul() -- Multiply fixed point numbers ;long fixmul(long x, long y); 48 clocks (486) x equ bp+8 y equ bp+4 Proc fixmul push bp ;Set up stack frame mov bp,sp push ebx ecx ;Save registers mov ecx,edx ;Save EDX:EAX xchg ebx,eax mov eax,[x] ;EAX = x / y (fixed point) mov edx,[y] imul edx shrd eax,edx,16 mov edx,ecx ;Restore EDX:EAX xchg ebx,eax xchg ax,bx ;DX:AX = result shr ebx,16 mov dx,bx pop ecx ebx ;Restore registers pop bp ;Delete stack frame ret 8 ;Return EndP fixmul End ~~~C_FIXDIV Ideal Public fixdiv Model Tiny CodeSeg P386 ;****************** fixdiv() -- Divide fixed point numbers ;long fixdiv(long x, long y); 57-86 clocks (486) x equ bp+8 y equ bp+4 Proc fixdiv push bp ;Set up stack frame mov bp,sp push ebx ecx esi ;Save registers mov ecx,edx ;Save EDX:EAX xchg ebx,eax mov eax,[x] ;EAX = x / y (fixed point) mov esi,[y] cdq shld edx,eax,16 shl eax,16 idiv esi mov edx,ecx ;Restore EDX:EAX xchg ebx,eax xchg ax,bx ;DX:AX = result shr ebx,16 mov dx,bx pop esi ecx ebx ;Restore registers pop bp ;Delete stack frame ret 8 ;Return EndP fixdiv End ~~~C_TRIG Ideal Extrn fixdiv:near Public sine, cosine, tangent, cotangent Public secant, cosecant Model Tiny CodeSeg P386 ;****************** TaylorSine() -- Calculate sine by Taylor series ;long TaylorSine(long x); Returns value in EBX ; *──────────────────────────────────────────────────* ; │ x^3 x^5 x^7 x^9 │ ; │ sin(x) = x - ───── + ───── - ───── + ───── - ... │ ; │ 3 ! 5 ! 7 ! 9 ! │ ; *──────────────────────────────────────────────────* x equ bp+4 Proc TaylorSine push bp ;Set up stack frame mov bp,sp push eax ecx edx esi ;Save registers mov eax,[x] ;First term = x xor ebx,ebx ;Result = 0 mov esi,1 ;Count = 1 TS_loop: add ebx,eax ;Add in term imul [dword x] ;term = last-term * x^2 shrd eax,edx,16 imul [dword x] shrd eax,edx,16 add esi,2 ;n = n + 2 mov ecx,esi ;ECX = n * (n - 1) dec ecx imul ecx,esi cdq ;term = last-term * x^2 / n(n-1) idiv ecx neg eax ;Invert sign test eax,eax ;Loop while not zero jnz TS_loop pop esi edx ecx eax ;Restore registers pop bp ;Delete stack frame ret 4 ;Return EndP TaylorSine Pi dd 0003243Fh ;Pi (3.243F6A88... hex) TwoPi dd 0006487Fh ;Pi*2 (6.487ED511... hex) HalfPi dd 00019220h ;Pi/2 (1.921FB544... hex) ;****************** sine() -- Trigonometric sine function ;long sine(long x); x equ bp+4 Proc sine push bp ;Set up stack frame mov bp,sp push ebx ;Save EBX mov ebx,[x] ;EBX = x + Pi add ebx,[Pi] push ebx [TwoPi] ;Divide by 2*Pi call fixdiv movsx ebx,dx ;EBX = integer part imul ebx,[TwoPi] ;Multiply by 2*Pi neg ebx ;EBX = x - EBX add ebx,[x] push ebx ;Calculate sine call TaylorSine xchg ax,bx ;Result in DX:AX shr ebx,16 mov dx,bx pop ebx ;Restore EBX pop bp ;Delete stack frame ret 4 ;Return EndP sine ;****************** cosine() -- Trigonometric cosine function ;long cosine(long x); x equ bp+4 Proc cosine push bp ;Set up stack frame mov bp,sp mov dx,[x+2] ;DX:AX = x mov ax,[x] add ax,[word HalfPi] ; x + Pi+2 adc dx,[word HalfPi+2] push dx ax ;cos(x) = sin(x + Pi/4) call sine pop bp ;Delete stack frame ret 4 ;Return EndP cosine ;****************** tangent() -- Trigonometric tangent function ;long tangent(long x); x equ bp+4 Proc tangent push bp ;Set up stack frame mov bp,sp push bx cx ;Save registers push [dword x] ;CX:BX = sin(x) call sine mov cx,dx xchg bx,ax push [dword x] ;DX:AX = cos(x) call cosine push cx bx dx ax ;tan(x) = sin(x) / cos(x) call fixdiv pop cx bx ;Restore registers pop bp ;Delete stack frame ret 4 ;Return EndP tangent ;****************** cotangent() -- Trigonometric cotangent function ;long cotangent(long x); x equ bp+4 Proc cotangent push bp ;Set up stack frame mov bp,sp push bx cx ;Save registers push [dword x] ;CX:BX = sin(x) call sine mov cx,dx xchg bx,ax push [dword x] ;DX:AX = cos(x) call cosine push dx ax cx bx ;cot(x) = cos(x) / sin(x) call fixdiv pop cx bx ;Restore registers pop bp ;Delete stack frame ret 4 ;Return EndP cotangent ;****************** secant() -- Trigonometric secant function ;long secant(long x); x equ bp+4 Proc secant push bp ;Set up stack frame mov bp,sp push [dword x] ;DX:AX = cos(x) call cosine push 1 0 dx ax ;sec(x) = 1 / cos(x) call fixdiv pop bp ;Delete stack frame ret 4 ;Return EndP secant ;****************** cosecant() -- Trigonometric cosecant function ;long cosecant(long x); x equ bp+4 Proc cosecant push bp ;Set up stack frame mov bp,sp push [dword x] ;DX:AX = cos(x) call sine push 1 0 dx ax ;csc(x) = 1 / sin(x) call fixdiv pop bp ;Delete stack frame ret 4 ;Return EndP cosecant End ~~~C_FIXTOA Ideal Public fixtoa Model Tiny CodeSeg P386 ;****************** fixtoa() -- Convert fixed point number to string ;void fixtoa(int n, char *strp); n equ bp+6 strp equ bp+4 Proc fixtoa push bp ;Set up stack frame mov bp,sp pusha ;Save all registers mov di,[strp] ;DI = string pointer mov dx,[n+2] ;DX:AX = n mov ax,[n] test dx,dx ;Negative? jge p1_noneg mov [byte di],'-' ;Store minus sign inc di neg dx ;Make it positive neg ax sbb dx,0 p1_noneg: push dx ;Save DX xor bx,bx ;Zero rem flag add ax,ax ;Shift out high bit adc bx,0 ;BX = rem flag shr ax,1 ;Restore AX mov cx,50000 ;AX = AX * 50000 mul cx shr ax,15 ;AX = AX / 32768 shl dx,1 or ax,dx pop dx ;Restore DX push bx ax ;Save BX, AX xchg dx,ax ;Integer part in AX xor cx,cx ;Zero CX mov si,10 ;SI = 10 p1_dloop: xor dx,dx ;Divide by 10 div si mov bl,dl ;Remainder in BL add bl,30h ;Convert to digit push bx ;Push digit inc cx test ax,ax ;Loop back jnz p1_dloop p1_ploop: pop ax ;Pop digit mov [di],al ;Store digit inc di loop p1_ploop ;Loop back mov [byte di],'.' ;Store decimal point inc di pop ax bx ;Restore low data xor dx,dx ;Zero DX test bx,bx ;Check for high part jz p1_nohigh add ax,50000 ;Add in 50000 adc dx,0 p1_nohigh: mov si,10 ;SI = 10 mov cx,5 ;5 digits jmp p1_skip1 p1_dloopb: xor dx,dx ;Zero DX p1_skip1: div si ;Divide by 10 mov bl,dl ;Remainder in BL add bl,30h ;Convert to digit push bx ;Push digit loop p1_dloopb ;Loop back mov cx,5 ;5 digits p1_ploopb: pop ax ;Pop digit mov [di],al ;Store digit inc di loop p1_ploopb ;Loop back mov [byte di],0 ;Add the null byte p1_done: popa ;Restore registers pop bp ;Delete stack frame ret 6 ;Return EndP fixtoa End ~~~C_ATOFIX Ideal Public atofix Model Tiny CodeSeg P386 ;****************** atofix() -- Convert string to fixed point number ;long atofix(char *strp); strp equ bp+4 Proc atofix push bp ;Set up stack frame mov bp,sp push bx cx si di bp ;Save registers mov si,[strp] ;SI = string xor ax,ax ;AX = 0 xor bh,bh ;BH = 0 mov cx,10 ;CX = 10 p1_ploop: mov bl,[si] ;Load char inc si cmp bl,' ' ;Loop while char is space je p1_ploop ;(20h, or 09h thru 0Dh) cmp bl,9 jna p1_go cmp bl,13 jbe p1_ploop p1_go: xor bp,bp ;BP = 0 cmp bl,'+' ;If char = '+', ignore je p1_loop cmp bl,'-' ;If char <> '-', keep it jne p1_skip inc bp ;Set negative flag p1_loop: mov bl,[si] ;Load char inc si p1_skip: xor dx,dx ;Clear DX cmp bl,'.' ;Decimal point, continue je p1_cont cmp bl,'9' ;Not a digit, finish ja p1_finish sub bl,'0' jc p1_finish mul cx ;Multiply by 10 add ax,bx ;Add in digit... jmp p1_loop ;Loop back p1_cont: push ax ;Save integer part xor ax,ax ;Zero AX mov di,1 ;DI = 1 p1_floop: mov bl,[si] ;Load char inc si cmp bl,'9' ;Not a digit, finish ja p1_ffinish sub bl,'0' jc p1_ffinish mul cx ;Multiply by 10 add ax,bx ;Add in digit... adc dx,0 imul di,10 ;Multiply divisor by 10 jnc p1_floop ;Loop while < 5 digits shr dx,1 ;5 digits, divide by 2 rcr ax,1 ;and set DI to 50000 mov di,50000 ;instead of 100000 p1_ffinish: xchg dx,ax ;Multiply by 65536 xor ax,ax div di ;Divide by 10^digits xchg dx,ax ;Fractional part in DX pop ax ;Restore integer part p1_finish: xchg dx,ax ;DX:AX = number dec bp ;Positive, don't negate jl p1_done neg dx ;Negate the result neg ax sbb dx,0 p1_done: pop bp di si cx bx ;Restore registers pop bp ;Delete stack frame ret 2 ;Return EndP atofix End ~~~C_BITS Ideal Public bitcnt,highbit Model Tiny P386 CodeSeg ;****************** bitcnt() -- Count set bits in integer ;int bitcnt(int x); x equ bp+4 Proc bitcnt push bp ;Set up stack frame mov bp,sp push bx cx ;Save registers xor cx,cx ;CX = 0 mov ax,[x] ;AX = number test ax,ax ;Zero? jz p1_done p1_loop: mov bx,ax ;Kill last bit dec bx and ax,bx loopnz p1_loop ;Loop while not zero p1_done: sub ax,cx ;Negative of CX pop cx bx ;Restore registers pop bp ;Delete stack frame ret 2 ;Return EndP bitcnt ;****************** highbit() -- Find high bit in integer ;int highbit(int x); returns -1 if it was zero x equ bp+4 Proc highbit push bp ;Set up stack frame mov bp,sp bsr ax,[x] ;Scan for bit jnz $+5 ;No bit set? mov ax,-1 ;Return -1 pop bp ;Delete stack frame ret 2 ;Return EndP highbit End ~~~C_SQRT Ideal Public sqrt Model Tiny P386 CodeSeg ;****************** sqrt() -- Returns the square root of a ; long. Result is an integer. ;int sqrt(long num); 60-350 clocks (486) num equ bp+4 Proc sqrt push bp ;Set up stack frame mov bp,sp push cx dx ;Save registers mov ax,[num] ;DX:AX = num mov dx,[num+2] mov cx,32 ;32 bits p1_bloop: add ax,ax ;Find the highest set bit adc dx,dx jc p1_gotbit loop p1_bloop p1_gotbit: mov ax,1 ;CX = first guess 2^(log2(n)/2) shr cx,1 shl ax,cl xchg cx,ax p1_loop: mov ax,[num] ;DX:AX = num mov dx,[num+2] div cx ;AX = num/guess add cx,ax ;CX = (guess+(num/guess))/2 shr cx,1 sub ax,cx ;If the difference is 1 cmp ax,1 ;or less, then done ja p1_loop ;Loop back xchg ax,cx ;AX = result pop dx cx ;Restore registers pop bp ;Delete stack frame ret 4 ;Return EndP sqrt End ~~~C_ROMAN Ideal Public roman Model Tiny CodeSeg P386 ;****************** roman() -- Convert integer to Roman Numerals num equ bp+6 buf equ bp+4 Proc roman push bp ;Set up stack frame mov bp,sp pusha ;Save all registers mov di,[buf] ;DI = buffer mov dx,[num] ;DX = number mov si,offset RNTbl_1 ;SI, BX = tables mov bx,offset RNTbl_2 p1_loop: lodsw ;Load size test ax,ax ;Done? jz p1_done p1_iloop: cmp dx,ax jl p1_lb mov cx,[bx] ;AX = code mov [di],cl ;Store first char inc di cmp ch,'.' ;If second char, then je p1_ilb ; store second char mov [di],ch inc di p1_ilb: sub dx,ax ;Reduce number jmp p1_iloop ;Loop back p1_lb: add bx,2 ;Advance pointer jmp p1_loop ;Loop back p1_done: mov [di],al ;Terminate string popa ;Restore registers pop bp ;Delete stack frame ret 4 ;Return EndP roman RNTbl_1 dw 1000,900,500,400,100 dw 90,50,40,10,9,5,4,1,0 RNTbl_2 db 'M.CMD.CDC.XCL.XLX.IXV.IVI.' End ~~~C_CRC16 Ideal Public crc16 Model Tiny CodeSeg P386 ;****************** crc16() -- Calculate 16-bit CRC ;int crc16(void *ptr, int cnt) ptr equ bp+6 cnt equ bp+4 Proc crc16 push bp ;Set up stack frame mov bp,sp push bx cx dx si ;Save registers mov si,[ptr] ;SI = pointer mov bx,[cnt] ;BX = count xor dx,dx ;Start with 0 p1_loop: lodsb ;Load byte xor dh,al ;XOR into result mov cx,8 ;8 bits p1_iloop: add dx,dx ;Shift left jnc $+5 ;If bit = 1, then xor dx,1021h ;XOR in CRC value loop p1_iloop ;Loop back dec bx ;Byte loop jnz p1_loop xchg dx,ax ;Result in AX p1_done: pop si dx cx bx ;Restore registers pop bp ;Delete stack frame ret 4 ;Return EndP crc16 End ~~~C_CRC32 Ideal Public crc32 Model Tiny CodeSeg P386 ;****************** crc32() -- Calculate 32-bit CRC ;long crc32(void *ptr, int cnt) ptr equ bp+6 cnt equ bp+4 Proc crc32 push bp ;Set up stack frame mov bp,sp push bx cx si di ;Save registers mov si,[ptr] ;SI = pointer mov bx,[cnt] ;BX = count xor dx,dx ;Start with 0 xor di,di p1_loop: lodsb ;Load byte xor dh,al ;XOR into result mov cx,8 ;8 bits p1_iloop: add di,di ;Shift left adc dx,dx jnc $+8 ;If bit = 1, then xor dx,04C1h ;XOR in CRC value xor di,1DB7h loop p1_iloop ;Loop back dec bx ;Byte loop jnz p1_loop xchg di,ax ;Result in DX:AX p1_done: pop di si cx bx ;Restore registers pop bp ;Delete stack frame ret 4 ;Return EndP crc32 End ; Virtual memory system by Tylisha C. Andersen. ; Support routines added by Tenie Remmel. ~~~C_VMEM Ideal Public vminit,vmclose,vmread,vmwrite Model Tiny P386 CodeSeg ;****************** vminit() -- Init virtual memory system ;int vminit(void); Proc vminit push bp ;Set up stack frame mov bp,sp mov ah,0 ;Init VM system call VMproc sbb ax,ax ;AX = 1 if ok, 0 if not inc ax pop bp ;Delete stack frame ret ;Return EndP vminit ;****************** vmclose() -- Close virtual memory system ;int vmclose(void); Proc vmclose push bp ;Set up stack frame mov bp,sp push ax ;Save AX mov ah,1 ;Close VM system call VMproc pop ax ;Restore AX pop bp ;Delete stack frame ret ;Return EndP vmclose ;****************** vmread() -- Read block of virtual memory ;int vmread(void *buf, long offs, int len); buf equ bp+10 offs equ bp+6 len equ bp+4 Proc vmread push bp ;Set up stack frame mov bp,sp push ebx cx dx ;Save registers mov ah,2 ;Read VM memory mov dx,[buf] mov ebx,[offs] mov cx,[len] call VMproc sbb ax,ax ;AX = 1 if ok, 0 if not inc ax pop dx cx ebx ;Restore registers pop bp ;Delete stack frame ret ;Return EndP vmread ;****************** vmwrite() -- Write block of virtual memory ;int vmwrite(void *buf, long offs, int len); buf equ bp+10 offs equ bp+6 len equ bp+4 Proc vmwrite push bp ;Set up stack frame mov bp,sp push ebx cx dx ;Save registers mov ah,3 ;Write VM memory mov dx,[buf] mov ebx,[offs] mov cx,[len] call VMproc sbb ax,ax ;AX = 1 if ok, 0 if not inc ax pop dx cx ebx ;Restore registers pop bp ;Delete stack frame ret ;Return EndP vmwrite ;---------------------------- Internal data section xmshandle dw 0 ; xms handle -6 xmssize dd 0 ; xms length -4 xmscall dd 0 ; xms call point +0 fhandle dw 0 ; file handle +4 fname db 'C:\$VM$.TMP',0 ; file name +6 ;---------------------------- VMproc: VM call point ; ------------------------ ; -- ah = 0: init ; -- ah = 1: close ; -- ah = 2: read ; ds:dx = buffer ; ebx = offset in VM ; cx = length ; -- ah = 3: write ; ds:dx = buffer ; ebx = offset in VM ; cx = length ; ------------------------ ; Returns cf = error flag ; ------------------------ ; Offsets and lengths for ; read/write must be even. Proc VMproc pushad ; save all registers push ds es ; load frame pointer mov di, offset xmscall test ah, ah ; service 0, init? jne vmm_cont cmp [word cs:di+4], 0 ; already initialized? jne vmm_bad push cs ; ds = cs pop ds mov ah, 3Ch ; create the temp file xor cx, cx lea dx, [di+6] int 21h jc vmm_done mov [di+4], ax ; save file handle mov ax, 4300h ; check for xms int 2Fh test al, al jz vmm_noxms mov al, 10h ; get xms call point int 2Fh mov [di], bx mov [di+2], es mov ah, 8 ; get free xms size call [dword di] test ax, ax ; no xms memory free? jz vmm_noxms push ax xchg dx, ax ; allocate all xms mov ah, 9 call [dword di] test ax, ax ; didn't work? jz vmm_noxms xor ebx,ebx ; ebx = xms size pop bx shl ebx, 10 mov [di-4], ebx ; save xms size mov [di-6], dx ; save xms handle jmp vmm_done ; return vmm_noxms: xor eax, eax ; set xms size 0 mov [di-4], eax jmp vmm_done vmm_bad: stc ; invalid request jmp vmm_done vmm_cont: cmp ah, 4 ; service out of range? jae vmm_bad cmp [word cs:di+4], 0 ; not initialized yet? je vmm_bad cmp ah, 1 ; check service number jne vmm_rw push cs ; ds = cs pop ds xor eax, eax ; clear the handle mov [di+4], ax cmp [di-4], eax ; check for xms je vmm_skip mov ah, 10 ; free xms block mov dx, [di-6] call [dword di] vmm_skip: mov ah, 3Eh ; close temp file mov bx, [di+4] int 21h mov ah, 41h ; delete temp file lea dx, [di+6] int 21h vmm_done: pop es ds ; restore registers popad ret ; return vmm_rw: test ebx, 0F0000001h ; offset and length must be jnz vmm_bad ; even for read/write, also test cl, 1 ; the length can't be zero. jnz vmm_bad test cx, cx jz vmm_bad mov ebp, [cs:di-4] ; ebp = xms length movzx ecx, cx ; ecx = end offset add ecx, ebx cmp ebx, ebp ; check for xms part jae vmm_file pushad ; save all registers push ds cmp ecx, ebp ; partly in file? jb $+5 mov ecx, ebp sub ecx, ebx ; ecx = length, si = block pusha ; get 16 bytes space mov si, sp push ss cmp ah, 2 ; check service number jne vmm_write mov [ss:si+14], ds ; set segment, ds = ss pop ds mov ax, [di-6] ; set xms handle mov [si+4], ax mov [si+6], ebx ; set xms offset mov [word si+10], 0 mov [si+12], dx ; set buffer offset jmp vmm_xcont ; jump to continue vmm_write: mov [ss:si+8], ds ; set segment, ds = cs pop ds mov ax, [di-6] ; set xms handle mov [si+10], ax mov [si+12], ebx ; set xms offset mov [word si+4], 0 mov [si+6], dx ; set buffer offset vmm_xcont: mov [si], ecx ; set length mov ah, 11 ; do it call [dword cs:di] add sp, 16 ; release the block cmp al, 1 ; check return value pop ds ; restore registers popad jc vmm_jdone ; jump if error vmm_file: sub ecx, ebp ; no file part? cmc jnc vmm_jdone sub ebx, ebp ; ebx = start in file jge $+5 xor ebx, ebx xchg bp, ax ; save service number sub ecx, ebx ; ecx = length push cx dx mov dx, bx ; cx:dx = offset shr ebx, 16 mov cx, bx mov ax, 4200h ; seek to position mov bx, [cs:di+4] int 21h pop dx cx jc vmm_jdone ; jump if error xchg bp, ax ; ah = service add ah, 3Dh int 21h ; read/write file data vmm_jdone: jmp vmm_done ; return EndP VMproc End