Avoid using NULL in non-pointer contexts: use 0 for integer values and '\0'
for chars.

rcsid[] and sccsid[] and copyright[] are essentially unmaintained (and
unmaintainable). these days, people use source. these id's do not provide
any benefit, and do hurt the small install media
(the 33,000 line diff is essentially mechanical)
ok with the idea millert, ok dms

set cp to the value of PAGER, so that type1 doesn't try to use it
uninitialized (page=1), or use wrong previously-set value of crt
(page=0). ok millert@

make it work with height 4 (division by zero)
ok millert@

Change how the line output from the 'h' command is formatted.
Previously if you had an ungodly number of messages the line could
wrap the screen. We now format the line in a buffer and then only
print as many characters as will fit instead of printing the parts
piecemeal.

Remove the advertising clause in the UCB license which Berkeley
rescinded 22 July 1999. Proofed by myself and Theo.

Use vis() on any remotely created input before displaying it on a screen.
deraadt@ ok

o kill strcpy()
o check return values of malloc and friends
o use strdup() when sensible

o ANSIfy
o Style nits
o Use const to silent stupid -Wall warnings
o strnc{py,at} -> strlc{py,at}
o Use strpbrk() instead of homegrown anyof()
o Use NULL instead of #defines with 0 cast to a pointer
This still could use a proper audit

Major signal overhaul. We no longer longjmp all over the place.
Instead, routines responsible to gathering user input (or in some
cases outputting data) catch the signals and set flags as needed.
Because of this some handlers are install without the SA_RESTART
flag so syscalls are not restarted and we can check the flag. All
signal handlers are now safe.

This should make the flow of control a bit more grokable but the
code is still ugly.

Instead of using a longjmp to catch SIGPIPE, just set to SIG_IGN and
check the return value on writes for error.

Save and restore terminal modes when piping to a command so we end
up with a known good state if the command terminates uncleanly.

Remove evil #ifdef __GNUC__ garbage to avoid longjmp clobbering and
use volatile instead.

Changes from Don Beusee:
o escape From line with a leading '>' when needed
o only print To: address and Subject lines if actually present
o new variable 'allnet' to treat user@foo and user@bar as the same "user"
o folders command now takes an optional argument like ls.
o new "pipe" (|) command to pipe the message through an arbitrary command
o make header display format the same as SunOS 4.1.3 /usr/ucb/mail
o tilde commands work regardless of interactive mode.
o fix "read: Interrupted system call" error by retrying if EINTR
o expanded help file
Changes by me:
o read the help file via the PAGER as it is now more than 24 lines long

warnx?/errx? paranoia (use "%s" not a bare string unless it is a
constant). These are not security holes but it is worth fixing
them anyway both for robustness and so folks looking for examples
in the tree are not misled into doing something potentially dangerous.
Furthermore, it is a bad idea to assume that pathnames will not
include '%' in them and that error routines don't return strings
with '%' in them (especially in light of the possibility of locales).

branches: 1.15.2;
Change the name of mail's send() function to sendmessages() to
avoid shadowing the libc send(2); gadams@avernus.com

When incorporating new messages, clear the "new" count before the
inc so the count of new messages is useful afterwards. This makes
mail behave more like the SunOS version in this respect.

fix scrolling and 'z' command; matt debergalis <deberg@mit.edu>

NetBSD changes (mostly comsmetic):
replace panic() with calls to err()/errx()
use S_IS* instead of doing by hand with S_IF*.
Use TIMESPEC_TO_TIMEVAL() and gettimeofday instead of time(2)
Use _POSIX_VDISABLE, not 0
Kill register

Fix one possible oflow (not exploitable) and do a wee bit of KNF.
Much more remains to be done.

tempnam(3) goes bye bye.

grabh() now returns SIGINT if it was interrupted (previously always
returned 0 and the return val was always ignored).
Add gethfromtty() to get a header (using grabh) from the tty and
quit on two ^C's.
Use gethfromtty() when getting Subject, Cc, and Bcc headers so
we can quit nicely. Closes PR #291.
Don't use longs where it doesn't make sense.

NOSTR -> NULL
Use sigsetjmp/siglongjmp instead of sigjmp/longjmp for portability.

bcopy() -> memcpy() and fix some casts.

Merge in NetBSD and 4.4BSD-lite2 changes as well as some of my own.
- handle long lines safely (from NetBSD)
- use puts/fputs and putchar/putc when it makes sense
- use err/errx and warn/warnx when it makes sense
- make return() and sizeof() style consisten
- some more buffer safety

overflows abound

Use ``mail.local -H'' to do dot locking so we can have mode 755 mail
spool, change an occurrence of tempnam() to mkstemp(), change some
longs and shorts to ints. Mail is now usable again.

from christos;
- Fix PR/105: Implement dot locking protocol and check return value of flock.
- Fix PR/2247: Don't call unknown users "ubluit". Issue an error message.
- Fix/add prototypes.
- Fix warnings.
- Use POSIX signal mask calls.

From NetBSD: merge of 960317

branches: 1.1.1;
Initial revision