Simplify redundant malloc'ing in sed -e.

When encountering an -e argument, sed currently mallocs a string to COPY
the optarg -- with '\n' appended. The appendage does not seem necessary --
indeed, t

Simplify redundant malloc'ing in sed -e.

When encountering an -e argument, sed currently mallocs a string to COPY
the optarg -- with '\n' appended. The appendage does not seem necessary --
indeed, the same call to add_compunit processing the sole command (given
without -e) passes the *argv verbatim: without making a copy, and without
appending newline.

This matches what is done in other BSDs.

Submitted by: Mikhail T.
PR: 195929
MFC after: 2 weeks

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Merge sync of head

Merge from HEAD

Merge ^/head r277804 through r277843.

sed: fix pasto from previous r277802.

MFC after: 3 days

Merging ^/head r277777 through r277803.

Fix resource leak and dereference after NULL.

process.c:
Protect access against NULL.

main.c:
Prevent outfile overwrite resource leak.

CID: 271181
CID: 1006930

Obtained from: NetBSD
MFC after: 3

Fix resource leak and dereference after NULL.

process.c:
Protect access against NULL.

main.c:
Prevent outfile overwrite resource leak.

CID: 271181
CID: 1006930

Obtained from: NetBSD
MFC after: 3 days

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MFhead @ r277403

Reintegrate head: r274132-r277384

Sponsored by: The FreeBSD Foundation

Reintegrate head revisions r273096-r277147

Sponsored by: The FreeBSD Foundation

sed: Address warnings with clang and gcc48.

MFC after: 2 weeks

Merge from head@274682

IFC @r269962

Submitted by: Anish Gupta (akgupt3@gmail.com)

Merge head from 7/28

Sync to HEAD@r269943.

sed(1): Don't force a newline on last line, if input stream doesn't have one

While here, change how we check if the current line is the last one.
Before, we just checked if there were more files aft

sed(1): Don't force a newline on last line, if input stream doesn't have one

While here, change how we check if the current line is the last one.
Before, we just checked if there were more files after the current one.
Now, we check the actual content of those files: they files may not have
a line at all. This matches the definition of the "last line" by the
Open Group.

The new behavior is closer to GNU sed.

PR: 160745
Phabric: https://phabric.freebsd.org/D431
Reviewed by: jilles
Approved by: jilles
Exp-run by: antoine

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More sed(1) usage fixing: the extension -i is not optional.

Pointed out by: jmallet
MFC after: 3 days

Fix sed(1) usage: the extension -i is not an optional.

MFC after: 3 days

Drop ifdef nonsense: just use setvbuf(3).

Pointed out by: kib, bde

Add -u (unbuffered output) after GNU sed.

Obtained from: NetBSD
MFC after: 1 week

Merge head r233826 through r256722.

Merge from head

IFC @ r254014

IFC @253398

IFC @ r252288