Properly fix 1987/lievaart invalid input checks

Now the game will re-prompt the player if invalid input is entered both
for the level and for the move. The way it was fixed is described in the
thanks-for-fixes.md file but here is a summary of the previous problem
and the fix.

If one entered an invalid level it proceeded to prompt for the move.
Thus if one entered '.' or anything other than a number it would still
move on. As for the move if one entered invalid input it would prompt
again but in an infinite loop, not letting one enter anything and
instead flooding the screen. The format specifier was thus a '%d'. Now
it's a '%2s' on a 'char A[100]'. After the scanf() it uses atoi(). For
the level it checks if > 10 || < 0 || !isdigit(*A) and if the if is 1 it
goes back to prompting the level. Of course since '-' is not a digit the
check for < 0 is superfluous but I did it anyway. Now prior to prompting
the level it zeroes out 'A' (*A='\0'). For the movement the do..while
loop condition checks for invalid input but it needed a scanf() with
"%2s" also and then use atoi() on the string (A). But in that case there
was no need to zero out the string (might not even be in the other but I
did it anyway).

Now as far as the level goes I checked for > 10 only because later in
the code it checks for < 10 and if so it increments it by 2 so I presume
that it's invalid if it's >10. This might or might not be correct but I
do not know the rules of the game and neither do I know the author's
intentions.

One more important point is that it does seem to stop playing the game,
making the same move again and again, but this might be another problem
or maybe it's a draw or something else. As I said I don't know how to
play the game so I can't verify it either way.

1987/lievaart/Makefile

@@ -62,11 +62,11 @@ CDEFINE=
 
 # Include files that are needed to compile
 #
-CINCLUDE=
+CINCLUDE= -include stdio.h
 
 # Optimization
 #
-OPT= -O3
+OPT=
 
 # Default flags for ANSI C compilation
 #

1987/lievaart/lievaart.c

@@ -6,15 +6,17 @@
 #define l int
 #define C y=v+111;H(x,v)*y++= *x
 #define H(a,b)R(a=b+11;a<b+89;a++)
-#define s(a)t=scanf("%d",&a)
+#define s(a)t=scanf("%2s",a)
+char A[100];
 l V[1100],u,r[]={-1,-11,-10,-9,1,11,10,9},h[]={11,18,81,88},ih[]={22,27,72,77},
 bz,lv=60,*x,*y,m,t;S(d,v,f,a,b)l*v;{l c=0,*n=v+100,bw=d<u-1?a:-9000,w,z,i,zb,q=
 3-f;if(d>u){R(w=i=0;i<4;i++)w+=(m=v[h[i]])==f?300:m==q?-300:(t=v[ih[i]])==f?-50
 :t==q?50:0;return w;}H(z,0){if(GZ(v,z,f,100)){c++;w= -S(d+1,n,q,-b,-bw);if(w>bw
 ){zb=z;bw=w;if(w>=b||w>=8003)Y w;}}}if(!c){bz=0;C;Y-S(d+1,n,q,-b,-bw);}bz=zb;Y
 d>=u-1?bw+(c<<3):bw;}main(){R(;t<1100;t+=100)R(m=0;m<100;m++)V[t+m]=m<11||m>88
-||(m+1)%10<2?3:0;V[44]=V[55]=1;V[45]=V[54]=2;I("Level:");s(u);e(lv>0){do{I("Yo\
-u:");s(m);if(t<1)break;}e(!GZ(V,m,2,0)&&m!=99);if(m!=99)lv--;if(lv<15&&u<10)u+=2;I("Wait\n")
+||(m+1)%10<2?3:0;V[44]=V[55]=1;V[45]=V[54]=2;x:*A='\0';I("Level:");s(A);if((u
+=atoi(A))>10||u<0||!isdigit(*A))goto x;e(lv>0){do{I("You:");s(A);m=atoi(A);*A='\0';
+}e(!GZ(V,m,2,0)&&m!=99);if(m!=99)lv--;if(lv<15&&u<10)u+=2;I("Wait\n")
 ;I("Value:%d\n",S(0,V,1,-9000,9000));I("move: %d\n",(lv-=GZ(V,bz,1,0),bz));}}GZ
 (v,z,f,o)l*v;{l*j,q=3-f,g=0,i,h,*k=v+z;if(*k==0)R(i=7;i>=0;i--){j=k+(h=r[i]);e(
 *j==q)j+=h;if(*j==f&&j-h!=k){if(!g){g=1;C;}e(j!=k)*((j-=h)+o)=f;}}Y g;}

1987/lievaart/lievaart2.c

@@ -7,8 +7,9 @@
 #define W if
 #define C y=v+111;H(x,v)*y++= *x
 #define H(a,b)R(a=b+11;a<b+89;a++)
-#define s(a)t=scanf("%d",&a)
+#define s(a)t=scanf("%2s",&a)
 #define U Z I
+char A[100];
 #define Z I("123\
 45678\n");H(x,V){putchar(".XO"[*x]);W((x-V)%10==8){x+=2;I("%d\n",(x-V)/10-1);}}
 l V[1600],u,r[]={-1,-11,-10,-9,1,11,10,9},h[]={11,18,81,88},ih[]={22,27,72,77},
@@ -17,8 +18,9 @@ bz,lv=60,*x,*y,m,t;S(d,v,f,_,a,b)l*v;{l c=0,*n=v+100,j=d<u-1?a:-9000,w,z,i,g,q=
 t==q?50:0;Y w;}H(z,0){W(E(v,z,f,100)){c++;w= -S(d+1,n,q,0,-b,-j);W(w>j){g=bz=z;
 j=w;W(w>=b||w>=8003)Y w;}}}W(!c){g=0;W(_){H(x,v)c+= *x==f?1:*x==3-f?-1:0;Y c>0?
 8000+c:c-8000;}C;j= -S(d+1,n,q,1,-b,-j);}bz=g;Y d>=u-1?j+(c<<3):j;}main(){R(;t<
-1600;t+=100)R(m=0;m<100;m++)V[t+m]=m<11||m>88||(m+1)%10<2?3:0;I("Level:");V[44]
-=V[55]=1;V[45]=V[54]=2;s(u);e(lv>0){Z do{I("You:");s(m);if(t<1)break;}e(!E(V,m,2,0)&&m!=99);
+1600;t+=100)R(m=0;m<100;m++)V[t+m]=m<11||m>88||(m+1)%10<2?3:0;x:I("Level:");V[44]
+=V[55]=1;V[45]=V[54]=2;s(A);if(((u=atoi(A))>10)||u<0||!isdigit(*A))goto x;e(lv>0){Z
+do{I("You:");s(A);m=atoi(A);*A='\0';}e(!E(V,m,2,0)&&m!=99);
 W(m!=99)lv--;W(lv<15&&u<10)u+=2;U("Wait\n");I("Value:%d\n",S(0,V,1,0,-9000,9000
 ));I("move: %d\n",(lv-=E(V,bz,1,0),bz));}}E(v,z,f,o)l*v;{l*j,q=3-f,g=0,i,w,*k=v
 +z;W(*k==0)R(i=7;i>=0;i--){j=k+(w=r[i]);e(*j==q)j+=w;W(*j==f&&j-w!=k){W(!g){g=1