question ong_list_insert_sorted usage

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Hi,

OK, I know this is not a list for this question, but I have posted on the GTK
list, but that is very low volume, and the answer is killing me. So, I
apologize for this question, but after struggling with this for over a day, I
wanted to ask you for your help regarding usage for g_list_insert_sorted. Can
someone please help. Here are the operative parts of my program:

I have the following struct:

typedef struct _message_info
{
char *from;
char *subject;
char *face;
long *ctime;
} MESSAGE_INFO;

I have the following comparison function:

static gint compare_ctime (gconstpointer a, gconstpointer b)
{
const MESSAGE_INFO *p1=a,*p2=b;

return ((p1->ctime > p2->ctime) ? +1: (p1->ctime == p2->ctime) ? 0 : -1);
}

and the following calling part:

Glist *headers;
.....
   MESSAGE_INFO *m;
   m = g_new(MESSAGE_INFO,1);
   m->from = safe_strdup (from);
   m->subject = safe_strdup (subject);
   m->face = safe_strdup (xface);
   m->ctime = ctime;
   headers = g_list_insert_sorted (headers, m,(GCompareFunc)compare_ctime);
....

I get segmentation fault with this, and was wondering how I could fix it. I
guess my question is how to use g_list_insert_sorted.

I have Googled quite a bit on this, but have not been able to devise the fix.
This is a programming error, I think, based on my inadequate knowledge. Any
help would be very appreciated. 

Many thanks and best wishes,
trotter


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