This patch implements the logic that process trailers
from file and arguments.
At the beginning trailers from file are in their own
infile_tok doubly linked list, and trailers from
arguments are in their own arg_tok doubly linked list.
The lists are traversed and when an arg_tok should be
applied, it is removed from its list and inserted
into the infile_tok list.
Signed-off-by: Christian Couder chrisc...@tuxfamily.org
---
trailer.c | 189 ++
1 file changed, 189 insertions(+)
diff --git a/trailer.c b/trailer.c
index aed25e1..e9ccfa5 100644
--- a/trailer.c
+++ b/trailer.c
@@ -46,3 +46,192 @@ static size_t alnum_len(const char *buf, size_t len)
while (--len = 0 !isalnum(buf[len]));
return len + 1;
}
+
+static void add_arg_to_infile(struct trailer_item *infile_tok,
+ struct trailer_item *arg_tok)
+{
+ if (arg_tok-conf-where == WHERE_AFTER) {
+ arg_tok-next = infile_tok-next;
+ infile_tok-next = arg_tok;
+ arg_tok-previous = infile_tok;
+ if (arg_tok-next)
+ arg_tok-next-previous = arg_tok;
+ } else {
+ arg_tok-previous = infile_tok-previous;
+ infile_tok-previous = arg_tok;
+ arg_tok-next = infile_tok;
+ if (arg_tok-previous)
+ arg_tok-previous-next = arg_tok;
+ }
+}
+
+static int check_if_different(struct trailer_item *infile_tok,
+ struct trailer_item *arg_tok,
+ int alnum_len, int check_all)
+{
+ enum action_where where = arg_tok-conf-where;
+ do {
+ if (!infile_tok)
+ return 1;
+ if (same_trailer(infile_tok, arg_tok, alnum_len))
+ return 0;
+ /*
+* if we want to add a trailer after another one,
+* we have to check those before this one
+*/
+ infile_tok = (where == WHERE_AFTER) ? infile_tok-previous :
infile_tok-next;
+ } while (check_all);
+ return 1;
+}
+
+static void apply_arg_if_exist(struct trailer_item *infile_tok,
+ struct trailer_item *arg_tok,
+ int alnum_len)
+{
+ switch (arg_tok-conf-if_exist) {
+ case EXIST_DO_NOTHING:
+ free(arg_tok);
+ break;
+ case EXIST_OVERWRITE:
+ free((char *)infile_tok-value);
+ infile_tok-value = xstrdup(arg_tok-value);
+ free(arg_tok);
+ break;
+ case EXIST_ADD:
+ add_arg_to_infile(infile_tok, arg_tok);
+ break;
+ case EXIST_ADD_IF_DIFFERENT:
+ if (check_if_different(infile_tok, arg_tok, alnum_len, 1))
+ add_arg_to_infile(infile_tok, arg_tok);
+ else
+ free(arg_tok);
+ break;
+ case EXIST_ADD_IF_DIFFERENT_NEIGHBOR:
+ if (check_if_different(infile_tok, arg_tok, alnum_len, 0))
+ add_arg_to_infile(infile_tok, arg_tok);
+ else
+ free(arg_tok);
+ break;
+ }
+}
+
+static void remove_from_list(struct trailer_item *item,
+struct trailer_item **first)
+{
+ if (item-next)
+ item-next-previous = item-previous;
+ if (item-previous)
+ item-previous-next = item-next;
+ else
+ *first = item-next;
+}
+
+static struct trailer_item *remove_first(struct trailer_item **first)
+{
+ struct trailer_item *item = *first;
+ *first = item-next;
+ if (item-next) {
+ item-next-previous = NULL;
+ item-next = NULL;
+ }
+ return item;
+}
+
+static void process_infile_tok(struct trailer_item *infile_tok,
+ struct trailer_item **arg_tok_first,
+ enum action_where where)
+{
+ struct trailer_item *arg_tok;
+ struct trailer_item *next_arg;
+
+ int tok_alnum_len = alnum_len(infile_tok-token,
strlen(infile_tok-token));
+ for (arg_tok = *arg_tok_first; arg_tok; arg_tok = next_arg) {
+ next_arg = arg_tok-next;
+ if (same_token(infile_tok, arg_tok, tok_alnum_len)
+ arg_tok-conf-where == where) {
+ /* Remove arg_tok from list */
+ remove_from_list(arg_tok, arg_tok_first);
+ /* Apply arg */
+ apply_arg_if_exist(infile_tok, arg_tok, tok_alnum_len);
+ /*
+* If arg has been added to infile,
+* then we need to process it too now.
+*/
+ if ((where == WHERE_AFTER ?
