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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