Anyone have a description for this problem?

[vasil angelov]

My program uses the following code

#include <stdio.h>
#include <stdlib.h>
void in_mas(FILE *f,int *a,int *len)
{ 
    int ch,c,fl=0,l=10;long see=0;
    long i=0;
  while(i<=l||(!feof(f)))
  {
 
      fscanf(f,"%d",&c);
       (*len)++;
        a[i]=c;
        i++;
  }  
     if(!feof(f)) printf("fdfd");
      if (!feof(f))
      {
          while(!feof(f))
              {
                 fscanf(f,"%d",&ch);
                 (*len)++;
              }
              a=(int*) realloc(a,(*len)*sizeof(int));
              printf("%d\n ",(*len));
              rewind(f);l=0;
              printf("%d ",i);
              while(!feof(f))
              {
                  fscanf(f,"%d",&c);
                  if(l>i)
                      a[l]=c;
                  l++;
              }
 
      }
}
 
 
  void out_mas(int *a,int *len)
  {
      int i=0;
      for( i;i<*len;i++)
      {printf("%d ",a[i]);}
  }
  int main()
  {
      int *a;
      int *len;
      int p;
      len=&p;
      *len=0;
      FILE *fpr;
      fpr=fopen("t.txt","r");
 
      if((a=(int *)malloc(10*sizeof(int)))==NULL)
             printf("Error\n");
      else
      {
      in_mas(fpr,a,len);
      out_mas(a,len);
      free(a);}
      return 0;
  }
 

It works just fine, but after i run it i get the following error message:
Debug error!
DAMAGE:after Normal block(#45) at 0x001C1D20
Can anyone please tell me what's the reason for this error?

[mac11]

Probably related to the first while in in_mas. That one looks fishy to me. Maybe go through that loop in your head and draw out your array and it's contents on paper as you go.

[donbock]

Can you find the statements that printed out that error message? There ought to be a conditional test nearby that would help to explain what went wrong.

[Banfa]

I believe that message is produced by the Debug C runtime library because it has detected corruption in a block of allocated memory either as it was freed or as the program exited.

Since you only allocate 1 block of memory, the cryptically named a the problem must be with what you are doing with that.

A agree with mac11, you loop lines 7 - 14 needs careful examination with reference to the size of a.