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X-Admin:	news AT aol DOT com
From:	sterten AT aol DOT com (Sterten)
Newsgroups:	comp.os.msdos.djgpp
Date:	29 Feb 2004 12:27:21 GMT
Organization:	AOL Bertelsmann Online GmbH & Co. KG http://www.germany.aol.com
Subject:	error under DOS , symify output
Message-ID:	<20040229072721.12245.00000640@mb-m02.aol.com>
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp
Reply-To:	djgpp AT delorie DOT com

I get this error when booting DOS from floppy  (DOS from Win98)


C:\PANCAKE>a:sprc kkk
Exiting due to signal SIGSEGV
Page fault at eip=0000171c, error=0004
eax=00000000 ebx=000a098c ecx=00000005 edx=0000d500 esi=00000054 edi=000a0974
ebp=000a07b0 esp=000a0790 program=a:\SPRC.EXE
cs: sel=00a7  base=10000000  limit=000affff
ds: sel=00af  base=10000000  limit=000affff
es: sel=00af  base=10000000  limit=000affff
fs: sel=008f  base=00030f20  limit=0000ffff
gs: sel=00bf  base=00000000  limit=0010ffff
ss: sel=00af  base=10000000  limit=000affff
App stack: [000a07d4..000207d4]  Exceptn stack: [00020730..0001e7f0]

Call frame traceback EIPs:
  0x0000171c _main+60
  0x000038c8 ___crt1_startup+176

C:\PANCAKE>symify sprc.exe


for the program below, compiled with gcc sprc.c -O2 -g -o sprc.exe
It runs correctly  in a DOS box under Win98.
any ideas how to correct it ?



#include <stdio.h>
FILE *file1;
int A[122][122],Min[222],I[222],F[222],Node[222]={0},zz[99]={0};
int im,x,y,z,i,j,k,kj,n,a,ii,c,a1,a2,a3,a4,a5,f,adj,solus,node=0,max=0;
char qwe;

int getnumber();
int spr();
int adjacencies();

int main(int argc,char* argv[]){
  if(argc<2){printf("\n\nusage:spr file [n,s] \n\n");
             printf("sorts permutations by prefix reversal\n");
             printf(" n  :  prints nodecounts\n");
             printf(" p  :  prints solution\n");
             printf(" s  :  prints nodecounts + all best solutions are
counted\n");
             printf(" v  :  prints partial results \n");
    ;exit(1);}
  if((file1=fopen(argv[1],"rb"))==NULL){printf("file-error");exit(1);}
qwe=argv[2][0];

m0:n=1;
m1:A[0][n]=getnumber();
   if(A[0][n]<0)n--;
   if(a!=13){n++;goto m1;}
//   if(A[0][n]<0)n--;

//for(j=1;j<=n;j++)printf("%i ",A[0][j]);printf("  %i\n",n);
c=spr();for(j=1;j<=n;j++)printf("%i ",A[0][j]);printf("  %i\n",c);
if(qwe=='p'){for(j=1;j<=i;j++)printf("%i ",I[j]);printf("\n");}
if(qwe=='n'||argv[2][0]=='s'){k=0;for(j=0;j<=i;j++){k+=Node[j];printf("%i
",Node[j]);}printf("   %i  %i\n",k,zz[0]);}
if(feof(file1)==0)goto m0;

if(qwe=='v'){printf("\n\n");for(i=0;i<10;i++)printf("%i ",zz[i]);printf("\n");}
fclose(file1);
}

//--------------------------------------------------------------
    int spr(){
    for(i=0;i<=n+33;i++)Node[i]=0;
    i=0;adj=adjacencies();f=n-adj;
    if(adj==n)return 0;
m70:for(i=0;i<222;i++)Min[i]=0;max=0;
     solus=0;i=0;F[0]=adj;
m80:i++;I[i]=1;
m100:ii=I[i]+1;I[i]=ii;if(ii>n)goto m170;
     if(ii==n && A[i-1][n]==n)goto m100;
     k=F[i-1];
     if(ii==n){if(A[i-1][1]==n)k++;goto m110;}
     if(abs(A[i-1][1]-A[i-1][ii+1])==1)k++;
     if(abs(A[i-1][ii]-A[i-1][ii+1])==1)k--;
m110:if(k<Min[i])goto m100;
     if(n-k+i>f)goto m100;
     Min[i]=k;if(i>max){max=i;
        if(qwe=='n'){
          for(j=0;j<=i;j++)printf("%i ",I[j]);printf("   %i %i\n",f,max);
          printf("-");for(j=1;j<=n;j++)printf("%i ",A[i-1][j]);printf("   %i
%i\n",f,max);
    }}

node++;if(node==1000000){node=0;
        if(qwe=='n'){for(j=0;j<n;j++)printf("%i ",Node[j]);printf("\n");}}
     ii=I[i];for(j=1;j<=ii;j++){A[i][j]=A[i-1][ii+1-j];}
     for(j=ii+1;j<=n;j++){A[i][j]=A[i-1][j];}
     F[i]=k;Node[i]++;
     if(F[i]==n){solus++;im=i;if(qwe!='s')return i;}
     goto m80;
m170:i--;if(i>0)goto m100;
    f++;
    if(qwe=='v')printf("--%i %i %i--\n",n,f,adj);
    if(solus==0)goto m70;
    i=im;return i;

}



int adjacencies(){
    j=0;if(A[i][n]==n)j++;
    for(kj=1;kj<n;kj++)if(A[i][kj]+1==A[i][kj+1] || A[i][kj]==A[i][kj+1]+1)j++;
    return j;}


int getnumber(){
gnu1:if(feof(file1)==0)goto gnu6;
 fin3:if(qwe=='v'){printf("\n\n");for(i=0;i<10;i++)printf("%i
",zz[i]);printf("\n");}
     exit(0);
gnu6:  a=fgetc(file1);
      if(a==13 || a==10)return -1;
       if(a<48||a>57)goto gnu1;c=a-48;
gnu2:if(feof(file1))goto fin3;a=fgetc(file1);
      if(a>47&&a<58){c=c*10+a-48;goto gnu2;}
return c ;}

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