fix: correction de bogues dans la fonction MBCreate : le segment reservé n'etait pas correctement renvoyé si l'espace mémoire etait pile.

noyau/mcb.asm

@@ -59,6 +59,7 @@ tables dw MBinit		;Table qui contient les adresses de toutes les fonctions de VI
          dw MBCreate
          dw MBresident
          dw MBGet
+         dw MBFind
          
 FirstMB dw 0
 
@@ -93,12 +94,16 @@ notforfree:
 ;Libère le bloc de mémoire GS
 MBFree:
 	push	bx es
+	pushad
+	mov dx,gs
+	mov cx,16
+	mov ah,0ah
+	int 47h
+	popad
 	mov	bx,gs
 	dec     bx
 	dec     bx
 	mov	es,bx
-	cmp	es:[MB.Check],'NH'
-	je	wasfree
 	cmp	es:[MB.Reference],Free
 	je	wasfree
 	cmp	es:[MB.IsResident],true
@@ -146,6 +151,235 @@ foundmcb:
 	ret
 	
 	
+	
+	
+	
+
+;==============================Affiche le nombre nb hexa en EDX de taille CX et couleur BL==============
+ShowHex:
+        push    ax bx cx edx si di
+        mov     di,cx
+        sub     cx,32
+        neg     cx
+        shl     edx,cl
+        shr     di,2
+        mov 	ah,09h
+        and 	bx,1111b
+Hexaize:
+        rol     edx,4
+        mov     si,dx
+	and	si,1111b
+	mov	al,cs:[si+offset tab]
+	push    cx
+	mov     cx,1
+        cmp     al,32
+        jb       control2
+        mov         ah,09h
+        int       10h
+control2:
+        mov    ah,0Eh
+        int    10h
+        pop     cx
+        dec     di
+        jnz     Hexaize
+        pop     di si edx cx bx ax
+        ret
+Tab db '0123456789ABCDEF'
+
+;==============================Affiche une chaine DS:SI de couleur BL==============
+showstr:
+        push ax bx cx si
+        mov cx,1
+again:
+        lodsb
+        or al,al
+        jz fin
+        and bx,0111b
+        cmp al,32
+        jb  control
+        mov ah,09h
+        int 10h
+control:
+        mov ah,0Eh
+        int 10h
+        jmp again
+        fin:
+        pop si cx bx ax
+        ret
+
+
+;================================================
+;Routine de débogage
+;================================================
+regdata:
+eaxr dd 0
+ebxr dd 0
+ecxr dd 0
+edxr dd 0
+esir dd 0
+edir dd 0
+espr dd 0
+ebpr dd 0
+csr dw 0
+dsr dw 0
+esr dw 0
+fsr dw 0
+gsr dw 0
+ssr dw 0
+
+reg db 0Dh,0Ah,"eax : ",0
+    db 0Dh,0Ah,"ebx : ",0
+    db 0Dh,0Ah,"ecx : ",0
+    db 0Dh,0Ah,"edx : ",0
+    db 0Dh,0Ah,"esi : ",0
+    db 0Dh,0Ah,"edi : ",0
+    db 0Dh,0Ah,"esp : ",0
+    db 0Dh,0Ah,"ebp : ",0
+    db 0Dh,0Ah,"cs  : ",0
+    db 0Dh,0Ah,"ds  : ",0
+    db 0Dh,0Ah,"es  : ",0
+    db 0Dh,0Ah,"fs  : ",0
+    db 0Dh,0Ah,"gs  : ",0
+    db 0Dh,0Ah,"ss  : ",0
+
+showreg:
+pushad
+pushf
+push ds
+mov cs:[eaxr],eax
+mov cs:[ebxr],ebx
+mov cs:[ecxr],ecx
+mov cs:[edxr],edx
+mov cs:[esir],esi
+mov cs:[edir],edi
+mov cs:[espr],esp
+mov cs:[ebpr],ebp
+mov cs:[csr],cs
+mov cs:[dsr],ds
+mov cs:[esr],es
+mov cs:[fsr],fs
+mov cs:[gsr],gs
+mov cs:[ssr],ss
+push cs
+pop ds
+mov si,offset poppp
+call Showstr
+mov si,offset reg
+mov di,offset regdata
+mov bx,7
+showregs:
+cmp byte ptr cs:[si+6],":"
+jne endshowregs
+call Showstr
+cmp byte ptr cs:[si+4]," "
+je segsss
+mov edx,cs:[di]
+mov cx,32
+call Showhex
+add di,4
+jmp showmax
+segsss:
+mov dx,cs:[di]
+mov cx,16
+call Showhex
+add di,2
+showmax:
+add si,9
+mov bp,dx
+push si
+mov si,offset beginds
+call showstr
+mov si,bp
+mov cx,8
+mov al,0
+letshow:
+mov dl,ds:[si]
+inc si
+call showhex
+inc al
+cmp al,10
+jb letshow
+mov si,offset ende
+call showstr
+mov si,offset begines
+call showstr
+mov si,bp
+mov cx,8
+mov al,0
+letshow2:
+mov dl,es:[si]
+inc si
+call showhex
+inc al
+cmp al,10
+jb letshow2
+mov si,offset ende
+call showstr
+pop si
+jmp showregs
+endshowregs:
+mov si,offset poppp
+call Showstr
+xor ax,ax
+int 16h
+pop ds
+popf
+popad
+ret
+begines db ' es[',0
+beginds db ' ds[',0
+ende db '] ',0	
+	
+	
+	
+	
+poppp db '*********',0	
+	
+	
+	
+	
+	
+;Renvoie en GS le MCB qui correspond a ds:si
+MBFind:
+        push    ax bx si di
+        mov	bx,cs:firstmb
+	dec	bx
+	dec	bx
+	mov     di,MB.Names
+search:
+	mov     gs,bx
+	cmp	gs:[MB.Check],'NH'
+	jne	itsend2
+        inc     bx
+        inc     bx
+	add	bx,gs:[MB.Sizes]
+	cmp     word ptr gs:[MB.Sizes],0
+	je      itsend2
+	push    si di
+cmpnames:
+        mov     al,gs:[di]
+        cmp     al,ds:[si]
+        jne     ok
+        cmp     al,0
+        je      ok
+        inc     si
+        inc     di
+        jmp     cmpnames
+ok:
+        pop     di si
+	je      foundmcb2
+	cmp	gs:[MB.IsNotLast],true
+	je	search
+itsend2:
+	stc
+	pop	di si bx ax
+	ret
+foundmcb2:
+	clc
+	pop	di si bx ax
+	ret
+		
+
 ;Creér un bloc de nom ds:si de taille cx (octets) -> n°segment dans GS
 MBCreate:
 	push	ax bx cx dx si di es	
@@ -172,7 +406,6 @@ searchfree:
 	mov	es:[MB.IsNotLast],True
 	mov	es:[MB.Reference],cs
 	mov	es:[MB.IsResident],False
-	mov	es:[MB.Sizes],cx
 	mov     di,MB.Names
 	push	ax cx
 	mov 	cx,32
@@ -191,15 +424,17 @@ endofloops:
 	mov	al,0
 	rep	stosb
 	pop	cx ax
-	sub	ax,cx
-	dec	ax
-	dec	ax
-	;js	nofree
 	inc     bx
 	inc     bx	
-	mov	gs,bx
-	add	bx,cx
-	mov	es,bx	
+        sub	ax,cx
+	dec	ax
+	dec	ax
+	cmp     ax,0
+	js	nofree
+	je      nofree
+	mov	es:[MB.Sizes],cx
+	add	cx,bx
+	mov	es,cx	
 	mov	es:[MB.IsNotLast],dl
 	mov	es:[MB.IsResident],False
 	mov	es:[MB.Reference],Free
@@ -208,6 +443,7 @@ endofloops:
 	mov	dword ptr es:[MB.Names+4],0
 	mov	es:[MB.Check],'NH'
 nofree:
+	mov	gs,bx
 	clc
 	pop	es di si dx cx bx ax
 	ret