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accidently removed the "dont compare > 8MB files hack".

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didn't rewind the files after the read()s in the non-mmap compare.
This commit is contained in:
Peter Wemm 1996-09-05 07:33:24 +00:00
parent 7b7fc30379
commit 8a4854e0f7
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=18039
1 changed files with 37 additions and 31 deletions
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68
usr.bin/xinstall/xinstall.c
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@ -40,7 +40,7 @@ static const char copyright[] =
#ifndef lint
/*static char sccsid[] = "From: @(#)xinstall.c 8.1 (Berkeley) 7/21/93";*/
static const char rcsid[] =
"$Id: xinstall.c,v 1.9 1996/08/12 17:03:30 peter Exp $";
"$Id: xinstall.c,v 1.10 1996/09/05 07:27:43 peter Exp $";
#endif /* not lint */
/*-
@ -490,39 +490,45 @@ compare(int from_fd, const char *from_name, int to_fd, const char *to_name,
tsize = (size_t)from_sb->st_size;
if (tsize <= 8 * 1024 * 1024 && trymmap(from_fd) && trymmap(to_fd)) {
p = mmap(NULL, tsize, PROT_READ, 0, from_fd, (off_t)0);
if ((long)p == -1)
err(EX_OSERR, "mmap %s", from_name);
q = mmap(NULL, tsize, PROT_READ, 0, to_fd, (off_t)0);
if ((long)q == -1)
err(EX_OSERR, "mmap %s", to_name);
if (tsize <= 8 * 1024 * 1024) {
if (trymmap(from_fd) && trymmap(to_fd)) {
p = mmap(NULL, tsize, PROT_READ, 0, from_fd, (off_t)0);
if ((long)p == -1)
err(EX_OSERR, "mmap %s", from_name);
q = mmap(NULL, tsize, PROT_READ, 0, to_fd, (off_t)0);
if ((long)q == -1)
err(EX_OSERR, "mmap %s", to_name);
rv = memcmp(p, q, tsize);
munmap(p, tsize);
munmap(q, tsize);
} else {
char buf1[16384];
char buf2[16384];
int n1, n2;
rv = memcmp(p, q, tsize);
munmap(p, tsize);
munmap(q, tsize);
} else {
char buf1[16384];
char buf2[16384];
int n1, n2;
rv = 0;
lseek(from_fd, 0, SEEK_SET);
lseek(to_fd, 0, SEEK_SET);
while (rv == 0) {
n1 = read(from_fd, buf1, sizeof(buf1));
if (n1 == 0)
break;
else if (n1 > 0) {
n2 = read(to_fd, buf2, n1);
if (n2 == n1)
rv = memcmp(buf1, buf2, n1);
else
rv = 1;
} else
rv = 1;
rv = 0;
lseek(from_fd, 0, SEEK_SET);
lseek(to_fd, 0, SEEK_SET);
while (rv == 0) {
n1 = read(from_fd, buf1, sizeof(buf1));
if (n1 == 0)
break; /* EOF */
else if (n1 > 0) {
n2 = read(to_fd, buf2, n1);
if (n2 == n1)
rv = memcmp(buf1, buf2, n1);
else
rv = 1; /* out of sync */
} else
rv = 1; /* read failure */
}
lseek(from_fd, 0, SEEK_SET);
lseek(to_fd, 0, SEEK_SET);
}
}
} else
rv = 1; /* don't bother in this case */
return rv;
}