r2857: this commit gets rid of smb_ucs2_t, wpstring and fpstring, plus lots 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)

1 files changed, 2 insertions, 11 deletions

diff --git a/source4/libcli/raw/rawrequest.c b/source4/libcli/raw/rawrequest.c
index a15d681a5c..89155451da 100644
--- a/source4/libcli/raw/rawrequest.c
+++ b/source4/libcli/raw/rawrequest.c
@@ -517,11 +517,7 @@ static size_t smbcli_req_pull_ucs2(struct smbcli_request *req, TALLOC_CTX *mem_c
 		src_len = byte_len;
 	}
 
-	src_len2 = strnlen_w((const smb_ucs2_t *)src, src_len/2) * 2;
-	if (src_len2 < src_len - 2) {
-		/* include the termination if we didn't reach the end of the packet */
-		src_len2 += 2;
-	}
+	src_len2 = utf16_len_n(src, src_len);
 
 	/* ucs2 strings must be at least 2 bytes long */
 	if (src_len2 < 2) {
@@ -722,12 +718,7 @@ static size_t smbcli_blob_pull_ucs2(TALLOC_CTX* mem_ctx,
 		return 0;
 	}
 
-	src_len2 = strnlen_w((const smb_ucs2_t *)src, src_len/2) * 2;
-
-	if (src_len2 < src_len - 2) {
-		/* include the termination if we didn't reach the end of the packet */
-		src_len2 += 2;
-	}
+	src_len2 = utf16_len_n(src, src_len);
 
 	ret = convert_string_talloc(mem_ctx, CH_UTF16, CH_UNIX, src, src_len2, (void **)&dest2);
 	if (ret == -1) {