ptest() was using this idea already.
As far as I can see, this is safe. Ttestsuite passes.
One downside is that a temporary from e.g. printf invocation
won't be freed until the next printf call.
function old new delta
awk_printf 481 468 -13
as_regex 137 111 -26
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 0/2 up/down: 0/-39) Total: -39 bytes
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
It seems to be designed to reduce overhead of malloc's auxiliary data,
by allocating at least 64 variables as a block.
With "struct var" being about 20-32 bytes long (32/64 bits),
malloc overhead for one temporary indeed is high, ~33% more memory used
than needed.
function old new delta
evaluate 3137 3145 +8
modprobe_main 798 803 +5
exec_builtin 1414 1419 +5
awk_printf 476 481 +5
as_regex 132 137 +5
EMSG_INTERNAL_ERROR 15 - -15
nvfree 169 116 -53
nvalloc 145 - -145
------------------------------------------------------------------------------
(add/remove: 0/2 grow/shrink: 5/1 up/down: 28/-213) Total: -185 bytes
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
hash_find(): do not caclculate hash twice. Do not divide - can use
cheap multiply-by-8 shift.
nextword(): do not repeatedly increment in-memory value, do it in register,
then store final result.
hashwalk_init(): do not strlen() twice.
function old new delta
hash_search3 - 49 +49
hash_find 259 281 +22
nextword 19 16 -3
evaluate 3141 3137 -4
hash_search 54 28 -26
------------------------------------------------------------------------------
(add/remove: 1/0 grow/shrink: 1/3 up/down: 71/-33) Total: 38 bytes
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
We can free them after they are no longer needed.
(Currently, being a NOEXEC applet is much larger waste of memory
for the case of long-running awk script).
function old new delta
awk_main 831 827 -4
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
The same stored search pattern applies to both search ('/') and
search/replace (':s') operations.
A search/replace operation with an empty "find" string (':s//abc/')
should use the last stored search pattern, if available, and issue an
error message if there is none.
If the "find" string is not empty it should replace the stored search
pattern.
function old new delta
colon 3952 4024 +72
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 1/0 up/down: 72/0) Total: 72 bytes
Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Let's adopt Herbert Xu's patch, not waiting for it to reach dash git:
hush already has a similar fix.
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
When the '-t DIR' option is used the loop over the remaining
arguments should terminate when a NULL pointer is reached.
function old new delta
mv_main 585 590 +5
cp_main 492 496 +4
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 2/0 up/down: 9/0) Total: 9 bytes
Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
If it's needed, there has to be a comment why. There isn't.
function old new delta
.rodata 103686 103669 -17
remove_file 598 571 -27
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 0/2 up/down: 0/-44) Total: -44 bytes
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Add O_NOFOLLOW (and O_NOCTTY for good measure) to open calls like e2fsprogs does.
In lsattr, when recursing, operate only on regular files, symlinks, and directories.
(Otherwise, "lsattr /dev" can e.g. open a watchdog device... not good).
At this time, looks like chattr/lsattr can't operate on symlink inodes -
ioctls do not work on open(O_PATH | O_NOFOLLOW) fds.
function old new delta
lsattr_dir_proc 168 203 +35
change_attributes 410 408 -2
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 1/1 up/down: 35/-2) Total: 33 bytes
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
-R is not an "unset these flags" argument, thus no conflict with "=".
function old new delta
.rodata 103684 103686 +2
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
