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Increase shcomp bytecode header version; doc updates

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src/cmd/ksh93/include/version.h:
- Centrally define the 93u+m copyright (SH_RELEASE_CPYR) for adding
  to the original AT&T copyright in 'ksh --man' and 'shcomp --man'.
- Centrally define the binary header version number for bytecode
  generated by shcomp: SHCOMP_HDR_VERSION.
- Bump SHCOMP_HDR_VERSION from 3 to 4. Converting all the preset
  aliases to builtin commands has caused new bytecode to be
  incompatible with old ksh. (However, old bytecode runs fine on
  93u+m, because shcomp pre-expands the preset aliases.)

src/cmd/ksh93/sh/shcomp.c:
- Instead of keeping its own version date (not changed since 2003),
  use the same version string as ksh itself (SH_RELEASE).
- Use SH_RELEASE_CPYR for the extra 93u+m copyright string.
- Use SHCOMP_HDR_VERSION for the bytecode header.

src/cmd/ksh93/sh/parse.c: sh_parse():
- Use SHCOMP_HDR_VERSION for the bytecode version check.

src/cmd/ksh93/data/builtins.c: opt_ksh[]:
- Use SH_RELEASE_CPYR for the extra 93u+m copyright string.

src/cmd/ksh93/COMPATIBILITY:
- Mention that 93u+m shcomp bytecode won't run on older ksh.
- Document changes in printf %T (re: 9526b3fa).

src/cmd/ksh93/README:
- Mention that we run on UnixWare (with major regressions).
  https://github.com/ksh93/ksh/pull/159#issuecomment-764667929
This commit is contained in:
Martijn Dekker 2021-01-21 14:15:30 +00:00
parent 9f43f8d10b
commit 7fdeadd4f1
6 changed files with 40 additions and 16 deletions
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31
src/cmd/ksh93/COMPATIBILITY
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@ -11,19 +11,22 @@ For more details, see the NEWS file and for complete details, see the git log.
POSIX standard more closely. See the manual page for details. It is
enabled by default if ksh is invoked as sh.
1. File name generation (a.k.a. pathname expansion, a.k.a. globbing) now
1. Bytecode compiled by shcomp 93u+m will not run on older ksh versions.
(However, bytecode compiled by older shcomp will run on ksh 93u+m.)
2. File name generation (a.k.a. pathname expansion, a.k.a. globbing) now
never matches the special navigational names '.' (current directory)
and '..' (parent directory). This change makes a pattern like .*
useful; it now matches all hidden 'dotfiles' in the current directory.
2. The bash-style &>foo redirection operator (shorthand for >foo 2>&1) can
3. The bash-style &>foo redirection operator (shorthand for >foo 2>&1) can
now always be used if -o posix is off, and not only in profile scripts.
3. Most predefined aliases have been converted to regular built-in
4. Most predefined aliases have been converted to regular built-in
commands that work the same way. 'unalias' no longer removes these.
To remove a built-in command, use 'builtin -d'. The 'history' and 'r'
predefined aliases remain, but are now only set on interactive shells.
There are some minor changes in behaviour in some former aliases:
There are some minor changes in behavior in some former aliases:
- 'redirect' now checks if all arguments are valid redirections
before performing them. If an error occurs, it issues an error
message instead of terminating the shell.
@ -31,12 +34,12 @@ For more details, see the NEWS file and for complete details, see the git log.
no parent shell to return to and the login session would freeze.
- 'times' now gives high precision output in a POSIX compliant format.
4. 'command' no longer expands aliases in its first argument, as this is
5. 'command' no longer expands aliases in its first argument, as this is
no longer required after change 3 above. In the unlikely event that you
still need this behavior, you can set:
alias command='command '
5. The undocumented 'login' and 'newgrp' builtin commands have been
6. The undocumented 'login' and 'newgrp' builtin commands have been
removed. These replaced your shell session with the external commands
by the same name, as in 'exec'. If an error occurred (e.g. due to a
typo), you would end up immediately logged out. If you do want this
@ -44,7 +47,7 @@ For more details, see the NEWS file and for complete details, see the git log.
alias login='exec login'
alias newgrp='exec newgrp'
6. 'case' no longer retries to match patterns as literal strings if they
7. 'case' no longer retries to match patterns as literal strings if they
fail to match as patterns. This undocumented behaviour broke validation
use cases that are expected to work. For example:
n='[0-9]'
@ -58,17 +61,23 @@ For more details, see the NEWS file and for complete details, see the git log.
echo "$n is a number or the number pattern" ;;
esac
7. If 'set -u'/'set -o nounset' is active, then the shell now errors out
8. If 'set -u'/'set -o nounset' is active, then the shell now errors out
if a nonexistent positional parameter such as $1, $2, ... is accessed.
(This does *not* apply to "$@" and "$*".)
8. If 'set -u'/'set -o nounset' is active, then the shell now errors out
9. If 'set -u'/'set -o nounset' is active, then the shell now errors out
if $! is accessed before the shell has launched any background process.
9. The 'print', 'printf' and 'echo' builtin commands now return a nonzero
10. The 'print', 'printf' and 'echo' builtin commands now return a nonzero
exit status if an input/output error occurs.
10. The 'typeset' builtin now properly detects and reports options that
11. Four obsolete date format specifiers for 'printf %(format)T' were
changed to make them compatible with modern date(1) commands:
- %k and %l now return a blank-padded hour (24-hour and 12-hour clock).
- %f now returns a date with the format '%Y.%m.%d-%H:%M:%S'.
- %q now returns the quarter of the current year.
12. The 'typeset' builtin now properly detects and reports options that
cannot be used together if they are given as part of the same command.
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