appease gcc -Wuninitialized

Check quoting before merging ifs regions.
sh -c 'set -- a; x="b c"; set -- "$@"$x'
now correctly gives $1=ab, $2=c

Don't merge ifs regions with different quoting requirements

expbackq() was incorrectly backing up a temporary buffer when removing \n
from the end of output of commands inside $(...) substitutions.
If the program output is n*128+1 bytes long (ending in a \n)

expbackq() was incorrectly backing up a temporary buffer when removing \n
from the end of output of commands inside $(...) substitutions.
If the program output is n*128+1 bytes long (ending in a \n) then the code
checks buf[-1] for another \n - looking an uninitialised stack.
On a big-endian system an integer of value 10 will satisfy this (unlikely
on little endian) and can happen depending on the last code path to use
a lot of stack!
This caused the problem with newvers.sh on sparc64 after ', 2005' was
added to the date list.
Fixed PR/28852

show more ...

Add new builtin `wordexp' to support wordexp(3).

From FreeBSD.
Provided in PR lib/26123.
Approved by kleink@.

Correctly apply IFS to unquoted text in ${x-text}.
Fixes PR/26058 and the 'for i in ${x-a b c}; do ...' and ${x-'a b' c}.
I can't find a PR for the latter problem.
Regression test goind in shortly.

Remove a broken optimistion that crept in earlier today.

Kill a diagnostic I accidentally left in.

No functional changes (intended).
Rename some variables, add some comments, and restructure a little.
In preparation for fixing "set ${x-a b c}" and friends.

Undo previous fix, breaks:
#!/bin/sh
echo ${1+"$@"}
./sh.new foo.sh a b c
a b c b c
I'll revisit this when I have some more time.

"for i in ${x-a b c}; do echo $i; done" should print "a\nb\nc\n" not "a b c\n"
like other shells do. mark the expansion for ifs splitting. XXX: linux has a
very complicated fix for this. I wonder why.

minor optimization in evalvar()
change sent in bin/23813 by VaX#n8

Fix 'set "*" b; case "* b" in "$@") ...' and 'set "*"; case 1 in "${#1}") ...'
Which got broken by the previous fix.

PR/22640: Paul Jarc: sh mishandles positional parameters in case. Fixed
from FreeBSD PR 56147.

Move UCB-licensed code from 4-clause to 3-clause licence.

Patches provided by Joel Baker in PR 22249, verified by myself.

Fixes from David Laight:
- ansification
- format of output of jobs command (etc)
- job identiers %+, %- etc
- $? and $(...)
- correct quoting of output of set, export -p and readonly -p
- differentia

Fixes from David Laight:
- ansification
- format of output of jobs command (etc)
- job identiers %+, %- etc
- $? and $(...)
- correct quoting of output of set, export -p and readonly -p
- differentiation between nornal and 'posix special' builtins
- correct behaviour (posix) for errors on builtins and special builtins
- builtin printf and kill
- set -o debug (if compiled with DEBUG)
- cd src obj (as ksh - too useful to do without)
- unset -e name, remove non-readonly variable from export list.
(so I could unset -e PS1 before running the test shell...)

show more ...

Revert previous change. No need to save rootshell. It is only affecting
the non-vfork case. Having said that, it would be nice if pipelines of
simple commands were vforked too. Right now they are not

Revert previous change. No need to save rootshell. It is only affecting
the non-vfork case. Having said that, it would be nice if pipelines of
simple commands were vforked too. Right now they are not.
Explain that setpgid() might fail because we are doing it both in the
parent and the child case, because we don't know which one will come
first.
Suspending a pipeline prints %1 Suspended n times where n is the number
of processes, but that was there before. It is easy to fix, but I'll
leave the code alone for now.

show more ...

Deal with rootshell not being maintained correctly in the vfork() case.
Propagate isroot, throughout the eval process and maintain it properly.
Fixes sleep 10 | cat^C not exiting because sleep and ca

Deal with rootshell not being maintained correctly in the vfork() case.
Propagate isroot, throughout the eval process and maintain it properly.
Fixes sleep 10 | cat^C not exiting because sleep and cat ended up in
their own process groups, because wasroot was always true in the children.

show more ...

Implement unset variable error messages from Ben Harris.

make sure we do not truncate arith expresssion > 10 digits.
freebsd bin/sh/expand.c revision 1.15. NetBSD PR 13943.

Globbing should match broken symlinks. stat()->lstat() to fix this.

remove redundant declarations and nexted externs.

Fix doubled 'the' in comment.

compile with WARNS = 2

Fix for bin/7502, from Tor Egge / FreeBSD. Their commit message:
> During variable expansion, the internal representation of the expression
> might be relocated. Handle this case.