Use getline(3) to handle lines longer than 8192 bytes in patch files

Spotted by jsg@ when working on mesa. Diff tested by sthen@ in
a partial i386 bulk. Input from and ok jsg@ millert@

Remove support for automatically checking files out of RCS. The
behavior is confusing to users and even GNU patch no longer does
it by default. OK krw@ guenther@

Introduce strtolinenum to properly check line numbers while parsing:
no signs, no spaces, just digits, 0 <= x <= LONG_MAX

ok millert, otto

Remove SCCS support. For this to work, we would need "get", which we don't
even have in ports. XSI functionality of POSIX, therefore optional.

ok deraadt, schwarze, tedu

type police and assorted cleanup. From Lionel Fourquaux; ok ray@

o fairly major man page reorganization
o add --posix option for strict POSIX conformance
o change filename determination to match GNU patch
Tested by various people, including a full ports build by n

o fairly major man page reorganization
o add --posix option for strict POSIX conformance
o change filename determination to match GNU patch
Tested by various people, including a full ports build by naddy@

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Add license from patch.c to original source files missing a license.

ok deraadt@

Do not add an extra newline at the end if the last line of the input
file contains no newline and the diff does not touch the last line.
Contributions from millert@.

ok millert@ tedu@

- use stdbool.h instead of roll-your-own booleans
- fix some -Wall warnings
- fix asserts: in some cases remove them, in other cases they have
become Internal errors or detection of malformed patch f

- use stdbool.h instead of roll-your-own booleans
- fix some -Wall warnings
- fix asserts: in some cases remove them, in other cases they have
become Internal errors or detection of malformed patch files.
- fix some free() related code

ok millert@ tedu@

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Print a maximum of one invalid line number warning per patch in a patch file.
Thanks to espie@ for spotting the problem.

ok millert@ henning@ espie@

minor knf and cleanups; otto ok

More cleanup: sprinkled some const, removed ugly EXTERN/INTERN.h,
some rewriting of code to make it more readable and more KNF.

ok millert@ tedu@ deraadt@

Missed this in the rejname commit.

More cleanup.
ok millert@ tedu@

fix header

remove a bit more junk

knf and other cleanup; ok otto

remove junk; ok otto tedu

oh, and the false protos can go

Strcat and Strcpy are no longer used

Use libc basename(3) and dirname(3) instead of defining our own. Also clean up some nasty assumptions that basename() returns a pointer that lies within its argument

Start of -Wall and cleaning up icky bits.

I hate static buffer sizes! Prolongue the max length of a line to 8K
(from 1K which a patch in ports/print/ghostscript5 had a line longer than).

*** empty log message ***

rindex -> strrchr