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1M, or in the case of non-UTF charsets, above 256
(This used to be commit 02595c14ac44403dd193d084dea9b91a67554a94)
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(This used to be commit 264ce9181089922547e8f6f67116f2d7277a5105)
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(This used to be commit 70055fb1f499cd40e996e56c7ba9ef8d2267b421)
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(This used to be commit 7067bb9b52223cafa28470f264f0b60646a07a01)
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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 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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