[gmime-devel] g_mime_header_list_clear leaving a list in limbo

[Ludo Brands <ludo brands free fr>]

Dear all,

I want to reorder the headers in a particular order. The easiest is to 
extract all headers, order them, clear the headerlist with 
g_mime_header_list_clear and append the headers again in the desired 
order with g_mime_header_list_append. Problem is that I'm getting a 
sigsegv when calling g_mime_header_list_append (the 4th or 5th line). 
When appending to a headerlist created with g_mime_header_list_new there 
is no problem and when I do a g_mime_header_iter_remove for the complete 
list, there is no problem either.
Looking in the sources I see that there is a loop over next = 
header->next; ... header = next; until header NULL. But afaiu this 
leaves list->tailpred pointing to a released node.

Also when deleting all headers with  g_mime_header_iter_remove, iter is 
not invalidated and while g_mime_header_iter_first returns false, 
g_mime_header_iter_last returns true indicating that tailpred isn't 
updated neither. g_mime_header_iter_get_name returns a random value 
after g_mime_header_iter_last. This seems to indicate that my "deleting 
all headers with  g_mime_header_iter_remove" workaround isn't that 
reliable and crash prone at one point.

Unrelated but kinda surprising to find that g_mime_header_list_prepend 
calls list_append instead of list_prepend. The hash table is updated to 
point to the newly added header but it is last in the headerlist.

thanks, Ludo