format c program

I want to edit and format (pretty print) someone else c programs.
It should use hard-tab and tabstop=8, but indentation sometime use tab
while sometime use spaces, like

/* return a pointer to a cell's [struct ent *], creating if needed */
struct ent *
lookat(int row, int col)
{
register struct ent **pp;

checkbounds(&row, &col);
pp = ATBL(tbl, row, col);
if (*pp == NULL) {
if (freeents != NULL) {
*pp = freeents;
(*pp)->flags &= ~is_clear;
(*pp)->flags |= may_sync;
freeents = freeents->next;
} else
*pp = (struct ent *) scxmalloc((unsigned)sizeof(struct ent));
if (row > maxrow) maxrow = row;
if (col > maxcol) maxcol = col;
(*pp)->label = (char *)0;

I'm not sure what indentation style it is called, but want to reformat
it. using gq seems like format it as text. Any idea how to do it?

--
regards,
====================================================
GPG key 1024D/4434BAB3 2008-08-24
gpg --keyserver subkeys.pgp.net --recv-keys 4434BAB3

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