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of associated functions.
The motivation for this change was to avoid having to convert to/from
ucs2 strings for so many operations. Doing that was slow, used many
static buffers, and was also incorrect as it didn't cope properly with
unicode codepoints above 65536 (which could not be represented
correctly as smb_ucs2_t chars)
The two core functions that allowed this change are next_codepoint()
and push_codepoint(). These functions allow you to correctly walk a
arbitrary multi-byte string a character at a time without converting
the whole string to ucs2.
While doing this cleanup I also fixed several ucs2 string handling
bugs. See the commit for details.
The following code (which counts the number of occuraces of 'c' in a
string) shows how to use the new interface:
size_t count_chars(const char *s, char c)
{
size_t count = 0;
while (*s) {
size_t size;
codepoint_t c2 = next_codepoint(s, &size);
if (c2 == c) count++;
s += size;
}
return count;
}
(This used to be commit 814881f0e50019196b3aa9fbe4aeadbb98172040)
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(This used to be commit 5045482b14dfcbb535eab3e5fa63ef1c3b46c40f)
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which is much clearer and simpler to use. It removes a specific parent
from a pointer, no matter whether that parent is a "reference" or a
direct parent. This gives complete control over the free process.
(This used to be commit 6c563887f1b9b8c842309a523e88b6f2a32db10f)
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the % coverage in terms of lines of code of a test suite. I thought a
good first place to start with gcov was the talloc test suite. When I
started the test suite covered about 60% of all lines of code in
talloc.c, and now it covers about 99%. The only lines not covered are
talloc corruption errors, as that would cause smb_panic() to fire.
It will be interesting to try gcov on the main Samba test suite for
smbd. We won't achieve 100% coverage, but it would be nice to get to
90% or more.
I also modified the talloc.c sources to be able to be build standalone, using:
gcc -c -D_STANDALONE_ -Iinlcude lib/talloc.c
that should make it much easier to re-use talloc in other projects
(This used to be commit 8d4dc99b82efdf24b6811851c7bdd4af5a4c52c9)
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- made the LOCAL-TALLOC smbtorture test much stricter, checking that
block counts for every pointer are correct after every operation
(This used to be commit 18d3e2647f0bedbba699d1ba2649c0cfe4526ef6)
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- added documentation for talloc_unreference()
- made the abandoned child logic in talloc_free() clearer and more consistent
(This used to be commit a87584c8e3fb06cd3ff29a918f681b5c6c32b9ff)
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MEASURING TALLOC VS MALLOC SPEED
talloc: 279154 ops/sec
malloc: 318758 ops/sec
which I think is an acceptable overhead for the increased functionality
(This used to be commit 91669ea830c16db2730c5e43a7cad26d9db5c585)
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The problem was that the simple "uint_t ref_count;" in a talloc chunk
did not give enough information. It told us that a pointer was
referenced more than once, but it didn't say who it was referenced
by. This means that when the pointer was freed we had no sane way to
clean up the reference.
I have now replaced ref_count with a "refs" list, which means that
references point to the pointer, and the pointer has a linked list of
references. So now we can cleanup from either direction without losing track of anything.
I've also added a LOCAL-TALLOC smbtorture test that tests talloc
behaviour for some common uses.
(This used to be commit 911a8d590cb184bcb892810729955c2c4cf02550)
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(This used to be commit 5cf9333f6021479d62cc99475f4fb9a19588f928)
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potentially we can test any charset
(This used to be commit e754d0cbcab7cb5a65322e5bbbd1d2a8bcdf5375)
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I had previously thought this was unnecessary, as windows doesn't use
standards compliant UTF-16, and for filesystem operations treats bytes
as UCS-2, but Bjoern Jacke has pointed out to me that this means we
don't correctly store extended UTF-16 characters as UTF-8 on
disk. This can be seen with (for example) the gothic characters with
codepoints above 64k.
This commit also adds a LOCAL-ICONV torture test that tests the first
1 million codepoints against the system iconv library, and tests 5
million random UTF-16LE buffers for identical error handling to the
system iconv library.
the lib/iconv.c changes need backporting to samba3
(This used to be commit 756f28ac95feaa84b42402723d5f7286865c78db)
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