diplodocus.org Git - nmh/blob - docs/historical/mh-nov-1983/subs/fdcompare.c

   1 fdcompare(fd1, fd2)
   2 {
   3         int n1, n2, resp;
   4         register int i;
   5         register char *c1, *c2;
   6         char b1[512], b2[512];
   7
   8         resp = 1;
   9         while((n1 = read(fd1, b1, 512)) >= 0 &&
  10               (n2 = read(fd2, b2, 512)) >= 0 &&
  11                n1 == n2) {
  12
  13                 c1 = b1; c2 = b2;
  14                 for(i = n1 < 512? n1 : 512; i--; )
  15                         if(*c1++ != *c2++) {
  16                                 resp = 0;
  17                                 goto leave;
  18                         }
  19                 if(n1 < 512)
  20                         goto leave;
  21         }
  22         resp = 0;
  23 leave:
  24         lseek(fd1, 0l, 0);
  25         lseek(fd2, 0l, 0);
  26         return(resp);
  27 }