sh(1): bring sh from freebsd

I used freebsd@19bed3ae2eb256a2c68dabbcb77eff2835d569de.

* Write absolute path in command -vV and type
* Keep ignored SIGINT/SIGQUIT after set in a background job
* pri

sh(1): bring sh from freebsd

I used freebsd@19bed3ae2eb256a2c68dabbcb77eff2835d569de.

* Write absolute path in command -vV and type
* Keep ignored SIGINT/SIGQUIT after set in a background job
* print a newline when ^D quits sh
* Do not ignore INTOFF during a trap
* Fix description of the "\$" sequence for PS1
* Allow more scripts without #!
* Fix double INTON with vfork
* Assert INTOFF rather than applying it in ck*
* Remove remnants to compile out fc completely
* Fix a "may be unused" warning on mips-gcc
* remove duplicate el definition
* fix read builtin on 32-bit systems
* Improve performance of "read" built-in command when using a seekable
* Fix rare memory leak with SIGINT
* Do not use our custom completion function, it is not needed anymore
* Add set -o pipefail
* Send normal output from bind builtin to stdout
* Restore $((x)) error checking after fix for $((-9223372036854775808))
* Make sh(1) support \u in PS1. This removes one fork/exec on
interactive
* Send libedit "ferr" output to fd 2
* Fix an edge case when parsing large numbers which resulted in
inconsistent
* Do not place exported but unset variables into the environment
* Make sh(1) collapse $HOME into "~" in PS1.
* Remove -c string from set builtin documentation
* Fix ${param?} default error message
* Use 126 and 127 exit status for failures opening a script
* Unify EXERROR and EXEXEC
* Use exitstatus instead of exerrno to pass EXEXEC status
* Fix formal overflow in pointer arithmetic
* Describe how to prevent *.core files from being created using ulimit.
* Don't treat % specially in CDPATH
* Don't use padvance() for MAIL/MAILPATH
* Split CNL syntax category to avoid a check on state[level].syntax
* Allow unquoted newlines in word in ${param+word} etc.
* Don't have [ match any [[:class:]]
* Allow overriding VTABSIZE at compile-time.
* Refactor job status printing, preparing for -o pipefail and similar
* Move various structs from jobs.h to jobs.c
* Fix a few speelling errors
* Don't leak wait* implementation details from jobs.c
* Markup and spelling fixes
* Fix mandoc -Tlint warnings in bin/
* General further adoption of SPDX licensing ID tags.
* Remove broken #ifdef NOHACK code (related to sh -c).
* Ignore error when cd writes the directory actually switched to.
* Enable interrupts before executing EXIT trap and doing final flush.
* Call fc -e editor with interrupts enabled.
* Make sure to process SIGINT if SETINTON re-enables processing.
* Allow defining nofork builtins from builtins.def and move always-safe
ones there.
* Fix INTOFF leak when a redirection on a compound command fails.
* Keep output buffer across builtins.
* Ensure memout.bufsize matches allocated buffer, if it exists.
* Simplify output buffering.
* Fix '-' from quoted arithmetic in case/glob pattern range.
* Fix INTOFF leak after a builtin with different locale settings.
* Update TOUR and comments for some code changes, some of them old.
* Simplify handling of newlines in command substitution.
* Simplify setinteractive().
* Fix use after free when resetting an in-use alias.
* Fix unalias -a while an alias is currently in use.
* Reduce size of limits table.
* Remove an XXX comment: it is normal for builtins to use argptr.
* Remove global state from collate_range_cmp().
* Don't scan word twice in ${param=word}.
* Don't scan word twice in ${param#%##%%word}.
* Don't scan word twice in ${param+-word}.
* Remove unused function declaration for arith_lex_reset().
* Remove unused return value of subevalvar_misc().
* Get rid of global variable argbackq.
* Fix executing wrong command with ${unsetvar#$(cmdsubst)}$(cmdsubst).
* Fix crash if a -T trap is taken during command substitution.
* bin: normalize paths using SRCTOP-relative paths or :H when possible
* Remove empty Li
* Do not import IFS's value from the environment.
* Fix a clang warning.
* Path generation was not according to collate
* Back out non-collating [a-z] ranges.
* After removing collation for [a-z] ranges in r302512, do it here too.
* Improve descriptions in 'ulimit -a' output.
* Clarify the explanations for the hostname and FQDN entries.
* Match the descriptions of the \H and \h prompt string sequences to reality.
* Hopefully fix Coverity CID 1008328 (Out-of-bounds write) in /bin/sh.
* Handle empty hostname and $PWD when building prompt
* Write LINENO value to stack string directly.
* Merge the projects/release-pkg branch to head.
* Simplify code by removing variable bracketed_name.
* replace 0 with NULL for pointers.
* Fix use-after-free if a trap replaces itself.
* Fix copying uninitialized field 'special'.
* Fix handling of umtxp resource limit in sh(1)/ulimit(1), limits(1), add
* Avoid out-of-bounds access in setoptionbyindex() for 'set -o nolog'.
* Fix some dead stores.
* Remove a redundant STPUTC check.
* Don't trust that signal descriptions fit within 49 bytes.
* Fix set -v and multiline history after r295825.
* Don't hash alias name when there are no aliases.
* Optimize setprompt(0).
* Remove unnecessary flushouts while reading script.
* Rework code to remove '\0' from shell input.
* Don't allocate a redirtab if there are no redirections.
* Document 'cd -'.
* Constify internal representation in expand.c.
* Remove a global variable from cd.c.
* Use OLDPWD shell variable for 'cd -'.
* Clean a readonly local, even if the variable does not exist outside.
* Simplify some code related to positional parameters.
* Update associated state when restoring locals while leaving a function.
* Reduce size of options table.
* Ensure OPTIND=1 in subshell without forking does not affect outer env.
* Reduce size of builtins table.
* Remove redundant CTLQUOTEMARK checks.
* Reindent expandmeta().
* Perform pathname generation during the first expansion phases.
* Perform IFS splitting during the first expansion phases.
* Split subevalvar() in #/##/%/%% and =/? parts.
* sh/mknodes: Close files and check for errors when writing.
* Fix use-after-free when attempting to modify a read-only variable.
* Remove global state from nodes.c.
* Fix ""$@, which should not use the special case for "$@".
* Avoid copying argv for simple commands.
* Make struct arglist an array instead of a linked list.
* Allow empty << EOF markers.
* Fix read with escaped IFS characters at the end.
* Add set -o nolog.
* Fix out of bounds read when there is no ] after a [:class:].
* Don't create bad parse result when postponing a bad substitution error.
* Avoid negative character values from $'\Uffffffff' etc.
* Backslash-newline should not affect field splitting in read builtin.
* When setting option via long name, don't go via letter.
* libedit has supported multibyte encodings for a while.
* Fix some arithmetic undefined behaviour.

Taken-from: FreeBSD

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sh: Sync with FreeBSD:

* Expand assignment-like words specially for export/readonly/local.
* Remove unused variables.
* Reset pendingsigs before checking pending traps, not after.
* Track continued

sh: Sync with FreeBSD:

* Expand assignment-like words specially for export/readonly/local.
* Remove unused variables.
* Reset pendingsigs before checking pending traps, not after.
* Track continued jobs (even if not continued by bg or fg).
* Inline waitproc() into its only caller.
* Fix EINTR race condition in "wait" and "set -T" using sigsuspend().
* use setinputfile instead of open/setinputfd.
* Prefer internal nextopt() to libc getopt().
* Use C99 flexible array instead of accessing array beyond bounds.
* Fix two issues when an alias is redefined.
* Detect and flag write errors on stdout in builtins.
* Prefer strsignal() to accessing sys_siglist directly.
* Don't lose $? when backquoted command ends with semicolon or newline.
* Fix crash when parsing '{ } &'.
* Pass $? to command substitution containing compound/multiple commands.
* Simplify cd-hash interaction.
* Remove mkinit's initialization routine.
* Move some stackmarks to fix high memory usage in some loops.
* Show negated commands (!) in jobs output.
* Prefer our character classification functions to <ctype.h>.
* Expand here documents in the current process.
* Do not test for digit_contig in mksyntax.
* Simplify mksyntax
* Fix a crash with the stackmark code.
* If a SIGINT or SIGQUIT interrupts "wait", return status 128+sig.
* When executing a trap, keep exit status along with evalskip.
* Update $FreeBSD$ to include SVN id.

Obtained-from: FreeBSD

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Initial import of binutils 2.22 on the new vendor branch

Future versions of binutils will also reside on this branch rather
than continuing to create new binutils branches for each new version.

Add regression tests for /bin/sh.

Obtained-from: FreeBSD