https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=6131
Joke Snelders <j.snelders@xxxxxxxxxx> changed:
What |Removed |Added
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CC| |j.snelders@xxxxxxxxxx
--- Comment #1 from Joke Snelders <j.snelders@xxxxxxxxxx> 2011-07-16 07:48:41 PDT ---
Here is the answer from helloworld:
http://ask.wireshark.org/questions/5069/tshark-custom-columns-why-dont-i-get-an-error-message
The bug is that prefs.c:2044 and prefs.c:2069 compare only the first few
characters of "%Custttttttttttttt", which match the expected string (%Cus):
const gchar *cust_format = col_format_to_string(COL_CUSTOM);
size_t cust_format_len = strlen(cust_format);
//...
if (strncmp(col_l_elt->data, cust_format, cust_format_len) == 0) {
cfmt->fmt = g_strdup(cust_format);
prefs_fmt = g_strdup(col_l_elt->data);
cust_format_info = g_strsplit(&prefs_fmt[cust_format_len+1],":",3); /*
add 1 for ':' */
cfmt->custom_field = g_strdup(cust_format_info[0]);
//....
If we add 1 to cust_format_len, the string comparison would include the null
terminator in cust_format, which would cause the desired syntax error:
if (strncmp(col_l_elt->data, cust_format, cust_format_len+1) == 0) {
//...
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