Zigzag in C

Here is the zigzag decoder in C

//=======================================================
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
int main (int argc, char *argv[]) {
 
 const int ArraySize= 10001 ;
 char cryptStr[ArraySize];
 int rowlen,r,newrow;
 char array[ArraySize];

 if ( argc < 3 ){
 printf("%s\n","zigzag_d rowlen cryptmessage");
 } else { 
 
 rowlen = atoi(argv[1]) ;
 strcpy(cryptStr,argv[2]);
//adjust for zero-numbering 
 rowlen--  ;

//init the array 
 for (r=0;r <=ArraySize  ;r++){  array[r]=0; }

int rowIndex =0;
int tempIndex=0;
int arrayLen = strlen(cryptStr)-1;
r=0;
newrow=0;

while(r <= arrayLen ){  
 if (newrow == 1 ) { 
// new row
  rowIndex++;
  tempIndex = rowIndex;
  array[tempIndex] = cryptStr[r]; 
  if (rowIndex == rowlen) { 
    tempIndex = tempIndex+2*rowlen;
  } else { 
    tempIndex = tempIndex+(2*(rowlen-rowIndex));
  } 
  r++;
  newrow=0;
 } else {

   if((rowIndex > 0 ) ) { //don't do on first row
     if(newrow==0) {
       array[tempIndex] = cryptStr[r]; 
       r++;
       tempIndex = tempIndex+2*rowlen-(2*(rowlen-rowIndex));
       if (tempIndex >arrayLen) { newrow =1; }
     } 
   }

   if(rowIndex != rowlen) { //don't do on last row
     if(newrow==0){ 
       array[tempIndex] = cryptStr[r];
       r++; 
       tempIndex = tempIndex+(2*(rowlen-rowIndex));
       if (tempIndex > arrayLen) { newrow =1 ; }
     }
   }
 }
}

 printf("%s\n", array);
} 
}
//=====================================================================