/* break70.c - Don Yang (uguu.org)

   Insert newline every 70 characters.

   09/03/04
                                                                           */

#include<stdio.h>

#define BREAK_LIMIT     70

int main(int argc, char **argv)
{
   FILE *infile;
   int i, c;

   if( argc > 1 )
   {
      if( (infile = fopen(argv[1], "rb")) == NULL )
         return printf("Can not open %s\n", argv[1]);
   }
   else
   {
      infile = stdin;
   }

   c = BREAK_LIMIT;
   while( (i = fgetc(infile)) != EOF )
   {
      (void)fputc(i, stdout);
      if( --c == 0 )
      {
         c = BREAK_LIMIT;
         (void)fputc('\n', stdout);
      }
   }

   return fclose(infile);
}