determine the endianness of the `struct fs *o' superblock from o->fs_magic
and set needswap as necessary, rather than trusting the caller to get
it right. invariably, almost every caller of ffs_sb_swap() was calling it
with ns set to the wrong value for ns anyway!
ansi KNF ffs_bswap.c declarations whilst here.
this fixes all sorts of problems when trying to use other-endian file systems,
notably the kernel trying to access memory *way* off, possibly corrupting or
panicing, and userland programs SEGVing and/or corrupting things (e.g,
"fsck_ffs -B" to swap a file system endianness).
whilst the previous rev of ffs_bswap.c (1.10, 2000/12/23) made this problem
worse, i suspect that the problem was always there and previous versions
just happened not to trash things at the wrong time.
FFS_EI should now be a lot more stable.
guard pages. Can only debug one malloc type at a time, and nothing
larger than 1 page. But can be useful for debugging certain types
of "data modified on freelist" type problems.
Modified from code in OpenBSD.
though it has nothing in the top half. Reading it as
only 8 bits can sometimes give erroneous values. Under
DEBUG, also stash the value read in the buserr_reg global,
since the value is only latched until read.
bytes in instead of at the start, to leave room for a .cpload to store
the gp at offset 0 in the frame. Allow 8 bytes for each (for mips64
one day...).
.cpload overwrite problems noted by Michael Hitch.
Modify the regex handling so that we can match fortunes in rot13'ed
databases (rot13 the pattern and maintain a second compiled pattern)
and rot13 the rot13'ed fortune before output.
Move the rot13 code to a function since it's now used in three places
instead of just one.
Initialize posfile in one place since it appears to get used without
being initialized when using debugging.
Make a *slight* improvement to the random seeding by squaring the pid
and then xor'ing against the current time, since just xor'ing the time
with the pid will not change if they both advance by one from "odd" to
"even".
