4.3BSD - /usr/src/new/mh/sbr/fdcompare.c

   1: /* fdcompare.c - are two files identical? */
   2: 
   3: #include "../h/mh.h"
   4: #include <stdio.h>
   5: 
   6: long lseek();
   7: 
   8: 
   9: fdcompare (fd1, fd2)
  10: register int fd1,
  11:          fd2;
  12: {
  13:     register int    i,
  14:             n1,
  15:                     n2,
  16:                     resp;
  17:     register char  *c1,
  18:                    *c2;
  19:     char    b1[BUFSIZ],
  20:             b2[BUFSIZ];
  21: 
  22:     resp = 1;
  23:     while ((n1 = read (fd1, b1, sizeof b1)) >= 0
  24:         && (n2 = read (fd2, b2, sizeof b2)) >= 0
  25:         && n1 == n2) {
  26:     c1 = b1;
  27:     c2 = b2;
  28:     for (i = n1 < sizeof b1 ? n1 : sizeof b1; i--;)
  29:         if (*c1++ != *c2++) {
  30:         resp = 0;
  31:         goto leave;
  32:         }
  33:     if (n1 < sizeof b1)
  34:         goto leave;
  35:     }
  36:     resp = 0;
  37: 
  38: leave: ;
  39:     (void) lseek (fd1, 0L, 0);
  40:     (void) lseek (fd2, 0L, 0);
  41:     return resp;
  42: }

Defined functions