diplodocus.org Git - nmh/blob - docs/historical/mh-jun-1982/subs/fdcompare.c

   1 #ifdef COMMENT
   2         Proprietary Rand Corporation, 1981.
   3         Further distribution of this software
   4         subject to the terms of the Rand
   5         license agreement.
   6 #endif
   7
   8 #include "../mh.h"
   9 long lseek();
  10
  11 fdcompare(fd1, fd2)
  12 {
  13         int n1, n2, resp;
  14         register int i;
  15         register char *c1, *c2;
  16         char b1[512], b2[512];
  17
  18         resp = 1;
  19         while((n1 = read(fd1, b1, 512)) >= 0 &&
  20               (n2 = read(fd2, b2, 512)) >= 0 &&
  21                n1 == n2) {
  22
  23                 c1 = b1; c2 = b2;
  24                 for(i = n1 < 512? n1 : 512; i--; )
  25                         if(*c1++ != *c2++) {
  26                                 resp = 0;
  27                                 goto leave;
  28                         }
  29                 if(n1 < 512)
  30                         goto leave;
  31         }
  32         resp = 0;
  33 leave:
  34         VOID lseek(fd1, 0l, 0);
  35         VOID lseek(fd2, 0l, 0);
  36         return(resp);
  37 }