source: trunk/third/nmh/sbr/fdcompare.c @ 12455

/*
 * fdcompare.c -- are two files identical?
 *
 * $Id: fdcompare.c,v 1.1.1.1 1999-02-07 18:14:08 danw Exp $
 */

#include <h/mh.h>


int
fdcompare (int fd1, int fd2)
{
    register int i, n1, n2, resp;
    register char *c1, *c2;
    char b1[BUFSIZ], b2[BUFSIZ];

    resp = 1;
    while ((n1 = read (fd1, b1, sizeof(b1))) >= 0
            && (n2 = read (fd2, b2, sizeof(b2))) >= 0
            && n1 == n2) {
        c1 = b1;
        c2 = b2;
        for (i = n1 < sizeof(b1) ? n1 : sizeof(b1); i--;)
            if (*c1++ != *c2++) {
                resp = 0;
                goto leave;
            }
        if (n1 < sizeof(b1))
            goto leave;
    }
    resp = 0;

leave: ;
    lseek (fd1, (off_t) 0, SEEK_SET);
    lseek (fd2, (off_t) 0, SEEK_SET);
    return resp;
}