Fix temp file handling.
o honor TMPDIR environment variable as per man page
o need 2 temp files if both file1 and file2 are devices
o add error() and errorx() which cleanup temp file and then
call er

Fix temp file handling.
o honor TMPDIR environment variable as per man page
o need 2 temp files if both file1 and file2 are devices
o add error() and errorx() which cleanup temp file and then
call err() and errx() respectively.

OK tedu@

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Fix temp file handling and deal with the case where we might need 2 temp files.

put all the flags and globals in diff.c, and declare externs in diff.h
ok millert@

o use S_ISDIR instead of doing it by hand
o rename talloc -> emalloc and ralloc -> erealloc
o struct direct -> struct dirent (POSIX)
o kill remaining strcpy()
o fix unterminated string in setfile()
d

o use S_ISDIR instead of doing it by hand
o rename talloc -> emalloc and ralloc -> erealloc
o struct direct -> struct dirent (POSIX)
o kill remaining strcpy()
o fix unterminated string in setfile()
deraadt@ OK

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o use getopt()
o use err/warn
o only call done() when needed (after mkstemp)
o add "-C lines" like GNU grep
OK deraadt@

remove silly signal catcher, and just use done. ok deraadt@

exit path signal race safe

cleanup. ansi, headers, correct prototypes, some safer string and
tempfile functions, whitespace, ...
no functional improvements yet

caldera licenses

4.3reno diff. This is free because of the Caldera license. Nasty, but a
place to start.