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Imported from ../bash-2.05b.tar.gz.

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Jari Aalto 2002-07-17 14:10:11 +00:00
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This document details the changes between this version, bash-2.05b-release,
and the previous version, bash-2.05b-beta2.
1. Changes to Bash
a. Fixed an off-by-one error in the function that translates job
specifications.
b. Note that we're running under Emacs and disable line editing if
$EMACS == `t'.
------------------------------------------------------------------------------
This document details the changes between this version, bash-2.05b-beta2,
and the previous version, bash-2.05b-beta1.
1. Changes to Bash
a. Fixed the /= and %= arithmetic operators to catch division by zero.
b. Added putenv, setenv, unsetenv to getenv replacement for completeness.
c. Fixed a bug that could cause the -O expand_aliases invocation option
to not take effect.
d. Fixed a problem with process substitution that resulted in incorrect
behavior when the number of process substitutions in an individual
command approached 64.
2. Changes to Readline
a. Fixed a problem with backward-char-search when on a system with support
for multibyte characters when running in a locale without any multibyte
characters.
------------------------------------------------------------------------------
This document details the changes between this version, bash-2.05b-beta1,
and the previous version, bash-2.05b-alpha1.
1. Changes to Bash
a. Fixed a problem when parsing a POSIX.2 character class name while
evaluating a bracket expression containing multibyte characters.
b. Changed the help text for `bind' to make it clear that any command
that may be placed in ~/.inputrc is a valid argument to `bind'.
c. Added `help' builtin entries for `((', `[[', and arithmetic for.
d. malloc updated again:
o slightly better overflow and underflow detection by putting the
chunk size at the beginning and end of the chunk and making
sure they match in free/realloc
o partial page allocated to make things page-aligned no longer
completely wasted
o block coalescing now enabled by default
o splitting and coalescing enabled for 32-byte chunks, the most
common size requested
o fixed a problem that resulted in spurious underflow messages and
aborts
o bin sizes are precomputed and stored in an array rather than
being computed at run time
o malloc will return memory blocks back to the system if the block
being freed is at the top of the heap and of sufficient size to
make it worthwhile
o malloc/free/realloc now inline memset instead of calling the
libc function; uses Duff's device for good performance
e. Check for getservent(); make the service name completion code dependent
on its presence.
f. Changed the readline callback that executes a command bound to a key
sequence to not save the executed command on the history list and to
save and restore the parsing state.
g. Changes to lib/sh/snprintf.c: fixed some bugs in the `g' and `G'
floating point format display; implemented the "'" flag character
that turns on thousands' grouping; fixed behavior on systems where
MB_CUR_MAX does not evaluate to a constant.
h. The `unset' builtin no longer returns a failure status when asked to
unset a previously-unset variable or function.
i. Changes to the build system to make it easier to cross-compile bash
for different systems.
j. Added `,' to the characters that are backslash-escaped during filename
completion, to avoid problems with complete-into-braces and RCS filenames
containing commas.
k. Some changes to the multibyte character support code to avoid many calls
to strlen().
l. Bash now correctly honors setting LANG to some value when LC_ALL does not
already have a value.
m. Fixed a bug that could cause SIGSEGV when processing nested traps with
trap handlers.
n. The `source/.' builtin now restores the positional parameters when it
returns unless they were changed using the `set' builtin during the file's
execution.
o. Fixed a bug that caused a syntax error when a command was terminated by
EOF.
2. New Features in Bash
a. There is now support for placing the long help text into separate files
installed into ${datadir}/bash. Not enabled by default; can be turned
on with `--enable-separate-helpfiles' option to configure.
b. All builtins that take operands accept a `--' pseudo-option, except
`echo'.
c. The `echo' builtin now accepts \0xxx (zero to three octal digits following
the `0') in addition to \xxx (one to three octal digits) for SUSv3/XPG6/
POSIX.1-2001 compliance.
3. Changes to Readline
a. Fixed a small problem in _rl_insert_char with multibyte characters.
b. Fixes from IBM for line wrapping problems when using multibyte characters.
c. Fixed a problem which caused the display to be messed up when the last
line of a multi-line prompt (possibly containing invisible characters)
was longer than the screen width.
d. Fixed a problem with the vi-mode `r' command that ocurred on systems with
support for multibyte characters when running in a locale without any
multibyte characters.
------------------------------------------------------------------------------
This document details the changes between this version, bash-2.05b-alpha1,
and the previous version, bash-2.05a-release.
1. Changes to Bash
a. Some changes to work around inlining differences between compilers.
b. Added more prototypes for internal shell typedefs, to catch argument
passing errors when using pointers to functions.
c. The `cd' builtin now fails in posix mode when a valid directory cannot be
constructed from a relative pathname argument and the $PWD using pathname
canonicalization, and the -P option has not been supplied. Previously,
the shell would attempt to use what the user typed, leading to weird
values for $PWD and discrepancies between the value of $PWD and the
actual working directory.
d. The `cd' builtin now resets $PWD when canonicalization fails but a chdir
to the pathname passed as an argument succeeds (when not in posix mode).
e. The `fc' builtin has been fixed, as POSIX requires, to use the closest
history position in range when given an out-of-range argument.
f. The history file loading code was changed to allow lines to be saved in
the history list from the shell startup files.
g. `history -s args' now works bettern in compound commands.
h. The tilde expansion code was fixed to better recognize when it's being
invoked in an assignment context, which enables expansion after `='
and `:'.
i. Fixed the command name completion code so a slash is no longer appended
to a single match if there happens to be a directory with that name in
$PWD.
j. Fixed compound array assignment to no longer perform alias expansion, to
allow reserved words as array members, and to not produce extra output
when the `-v' option had been enabled.
k. Fixed the programmable completion code to better handle newlines in lists
of possible completions (e.g., `complete -W').
l. Removed the reserved words from the `bash-builtins' manual page.
m. Parser error reporting now attempts to do a better job of identifying the
token in error rather than doing straight textual analysis.
n. Fixes for Inf/NaN, locales, wide/multibyte characters and zero-length
arguments in the library snprintf(3) replacement.
o. `read -e' no longer does command name completion on the first word on
the line being read.
p. `select' now returns failure if the read of the user's selection fails.
q. Fixed a bug that could cause a core dump when setting $PIPESTATUS.
r. Fixes to not allocate so many job slots when the shell is running a loop
with job control enabled in a subshell of an interactive shell.
s. Fixed a bug in the trap code that caused traps to be inherited by
command substitutions in some cases.
t. Fixed a bug that could cause alias expansion to inappropriately expand
the word following the alias.
u. Fixed a bug in the `kill' builtin that mishandled negative pid arguments.
v. The parser is less lenient when parsing assignment statements where the
characters before the `=' don't comprise a valid identifier.
w. The arithmetic expression evaluation code now honors the setting of the
`-u' option when expanding variable names.
x. Fixed the arithmetic evaluation code to allow array subscripts to be
assigned (`let b[7]=42') and auto-incremented and auto-decremented
(e.g., b[7]++).
y. Reimplemented the existing prompt string date and time expansions using
strftime(3), which changed the output of \@ in some locales.
z. Fixed a bug that could cause a core dump when a special shell variable
(like RANDOM) was converted to an array with a variable assignment.
aa. Fixed a bug that would reset the handler for a signal the user had
trapped to a function that would exit the shell when setting the exit
trap in a non-interactive shell.
bb. Changed the execve(2) wrapper code to check whether or not a failing
command is a directory before looking at whether a `#!' interpreter
failed for some reason.
cc. Fixed a bug in the command printing code so it no longer inserts a `;'
after a newline, which produces a syntax error when reused as input.
dd. The code that expands $PS4 no longer inherits the `-x' flag.
ee. The bash-specific completion functions may now take advantage of the
double-TAB and M-? features of the standard readline completion
functions.
ff. The mail checking code no longer prints a message if the checked file's
size has not increased, even if the access time is less than the modification time.
gg. Rewrote the variable symbol table code: there is now a stack of
contexts, each possibly including a separate symbol table; there can
be more than one temporary environment supplied to nested invocations
of `./source'; the temporary environments no longer require so much
special-case code; shell functions now handle the temporary environment
and local variables more consistently; function scope exit is faster now
that the entire symbol table does not have to be traversed to dispose of
local variables; it is now easier to push vars from the temporary
environment to the shell's variable table in posix mode; some duplicated
code has been removed.
hh. Regularized the error message printing code; builtin_error is now called
more consistently, and common error message strings are handled by small
functions. This should make eventual message translation easier.
ii. Error messages now include the line number in a script when the shell
is not interactive.
jj. Array subscript expansion now takes place even when the array variable is
unset, so side effects will take place.
kk. Fixed a bug in the SICGHLD child-reaping code so that it won't find
jobs already marked as terminated if the OS reuses pids quickly enough.
ll. Fixed a bug that could cause a signal to not interrupt the `wait'
builtin while it was waiting for a background process to terminate.
mm. A couple of changes to make it easier for multiple shells to share history
files using `history -n', `history -r', and `history -w'.
nn. The `getopts' builtin always increments OPTIND to point to the next
option to be handled when an option is returned, whether it's valid
or not, as POSIX 1003.x-2001 requires.
oo. Changed some parts of the expansion code to avoid allocating and
immediately freeing memory without using the results for anything.
pp. The shell now keeps track of $IFS internally, updating its internal map
each time the variable is assigned a new value (or at local scope exit).
This saves thousands of hash lookups for IFS, which, while individually
cheap, add up.
qq. Rewrote the hash table code: searching and insertion are much faster now,
and it uses a better string hashing function; augmented the function
interface to simplify other parts of the code and remove duplicated code
rr. The shell now uses a simple, generic `object cache' for allocating and
caching words and word lists, which were the major users of
malloc/free.
ss. Fixed the assignment statement parsing code to allow whitespace and
newlines in subscripts when performing array element assignment.
tt. The shell now issues many fewer calls to sigprocmask and other signal
masking system calls.
uu. Fixed the `test' and conditional command file comparison operators to
work right when one file has a non-positive timestamp and the other
does not exist.
vv. Fixed some cases where the special characters '\001' and '\177' in the
values of variables or positional parameters caused incorrect expansion
results.
2. Changes to Readline
a. Fixed output of comment-begin character when listing variable values.
b. Added some default key bindings for common escape sequences produced by
HOME and END keys.
c. Fixed the mark handling code to be more emacs-compatible.
d. A bug was fixed in the code that prints possible completions to keep it
from printing empty strings in certain circumstances.
e. Change the key sequence printing code to print ESC as M\- if ESC is a
meta-prefix character -- it's easier for users to understand than \e.
f. Fixed unstifle_history() to return values that match the documentation.
g. Fixed the event loop (rl_event_hook) to handle the case where the input
file descriptor is invalidated.
h. Fixed the prompt display code to work better when the application has a
custom redisplay function.
i. Changes to make reading and writing the history file a little faster, and
to cope with huge history files without calling abort(3) from xmalloc.
j. The vi-mode `S' and `s' commands are now undone correctly.
3. New Features in Bash
a. If set, TMOUT is the default timeout for the `read' builtin.
b. `type' has two new options: `-f' suppresses shell function lookup, and
`-P' forces a $PATH search.
c. New code to handle multibyte characters.
d. `select' was changed to be more ksh-compatible, in that the menu is
reprinted each time through the loop only if REPLY is set to NULL.
The previous behavior is available as a compile-time option.
e. `complete -d' and `complete -o dirnames' now force a slash to be
appended to names which are symlinks to directories.
f. There is now a bindable edit-and-execute-command readline command,
like the vi-mode `v' command, bound to C-xC-e in emacs mode.
g. Added support for ksh93-like [:word:] character class in pattern matching.
h. The $'...' quoting construct now expands \cX to Control-X.
i. A new \D{...} prompt expansion; passes the `...' to strftime and inserts
the result into the expanded prompt.
j. The shell now performs arithmetic in the largest integer size the
machine supports (intmax_t), instead of long.
k. If a numeric argument is supplied to one of the bash globbing completion
functions, a `*' is appended to the word before expansion is attempted.
l. The bash globbing completion functions now allow completions to be listed
with double tabs or if `show-all-if-ambiguous' is set.
m. New `-o nospace' option for `complete' and `compgen' builtins; suppresses
readline's appending a space to the completed word.
n. New `here-string' redirection operator: <<< word.
o. When displaying variables, function attributes and definitions are shown
separately, allowing them to be re-used as input (attempting to re-use
the old output would result in syntax errors).
p. There is a new configuration option `--enable-mem-scramble', controls
bash malloc behavior of writing garbage characters into memory at
allocation and free time.
q. The `complete' and `compgen' builtins now have a new `-s/-A service'
option to complete on names from /etc/services.
r. `read' has a new `-u fd' option to read from a specified file descriptor.
s. Fix the completion code so that expansion errors in a directory name
don't cause a longjmp back to the command loop.
t. Fixed word completion inside command substitution to work a little more
intuitively.
u. The `printf' %q format specifier now uses $'...' quoting to print the
argument if it contains non-printing characters.
v. The `declare' and `typeset' builtins have a new `-t' option. When applied
to functions, it causes the DEBUG trap to be inherited by the named
function. Currently has no effect on variables.
w. The DEBUG trap is now run *before* simple commands, ((...)) commands,
[[...]] conditional commands, and for ((...)) loops.
x. The expansion of $LINENO inside a shell function is only relative to the
function start if the shell is interactive -- if the shell is running a
script, $LINENO expands to the line number in the script. This is as
POSIX-2001 requires.
y. The bash debugger in examples/bashdb has been modified to work with the
new DEBUG trap semantics, the command set has been made more gdb-like,
and the changes to $LINENO make debugging functions work better. Code
from Gary Vaughan.
z. New [n]<&word- and [n]>&word- redirections from ksh93 -- move fds (dup
and close).
aa. There is a new `-l' invocation option, equivalent to `--login'.
bb. The `hash' builtin has a new `-l' option to list contents in a reusable
format, and a `-d' option to remove a name from the hash table.
4. New Features in Readline
a. Support for key `subsequences': allows, e.g., ESC and ESC-a to both
be bound to readline functions. Now the arrow keys may be used in vi
insert mode.
b. When listing completions, and the number of lines displayed is more than
the screen length, readline uses an internal pager to display the results.
This is controlled by the `page-completions' variable (default on).
c. New code to handle editing and displaying multibyte characters.
d. The behavior introduced in bash-2.05a of deciding whether or not to
append a slash to a completed name that is a symlink to a directory has
been made optional, controlled by the `mark-symlinked-directories'
variable (default is the 2.05a behavior).
e. The `insert-comment' command now acts as a toggle if given a numeric
argument: if the first characters on the line don't specify a
comment, insert one; if they do, delete the comment text
f. New application-settable completion variable:
rl_completion_mark_symlink_dirs, allows an application's completion
function to temporarily override the user's preference for appending
slashes to names which are symlinks to directories.
g. New function available to application completion functions:
rl_completion_mode, to tell how the completion function was invoked
and decide which argument to supply to rl_complete_internal (to list
completions, etc.).
h. Readline now has an overwrite mode, toggled by the `overwrite-mode'
bindable command, which could be bound to `Insert'.
i. New application-settable completion variable:
rl_completion_suppress_append, inhibits appending of
rl_completion_append_character to completed words.
j. New key bindings when reading an incremental search string: ^W yanks
the currently-matched word out of the current line into the search
string; ^Y yanks the rest of the current line into the search string,
DEL or ^H deletes characters from the search string.
------------------------------------------------------------------------------
This document details the changes between this version, bash-2.05a-release,
and the previous version, bash-2.05a-rc1.