[PATCH nft 1/3] scanner: move the file descriptor to be in the input_descriptor structure

[Laurent Fasnacht <fasnacht@protonmail.ch>]

This prevents a static allocation of file descriptors array, thus allows
more flexibility.

Signed-off-by: Laurent Fasnacht <fasnacht@protonmail.ch>
---
 include/nftables.h |  3 ++-
 src/scanner.l      | 17 ++++++++---------
 2 files changed, 10 insertions(+), 10 deletions(-)

diff --git a/include/nftables.h b/include/nftables.h
index 90d33196..ca0fbcaf 100644
--- a/include/nftables.h
+++ b/include/nftables.h
@@ -122,7 +122,6 @@ struct nft_ctx {
 	void			*scanner;
 	struct scope		*top_scope;
 	void			*json_root;
-	FILE			*f[MAX_INCLUDE_DEPTH];
 };
 
 enum nftables_exit_codes {
@@ -176,6 +175,7 @@ enum input_descriptor_types {
  * struct input_descriptor
  *
  * @location:		location, used for include statements
+ * @f:          file descriptor
  * @type:		input descriptor type
  * @name:		name describing the input
  * @union:		buffer or file descriptor, depending on type
@@ -186,6 +186,7 @@ enum input_descriptor_types {
  */
 struct input_descriptor {
 	struct list_head		list;
+	FILE*                   f;
 	struct location			location;
 	enum input_descriptor_types	type;
 	const char			*name;
diff --git a/src/scanner.l b/src/scanner.l
index 99ee8355..2016acd5 100644
--- a/src/scanner.l
+++ b/src/scanner.l
@@ -691,13 +691,13 @@ static void scanner_pop_buffer(yyscan_t scanner)
 }
 
 static void scanner_push_file(struct nft_ctx *nft, void *scanner,
-			      const char *filename, const struct location *loc)
+				  FILE *f, const char *filename, const struct location *loc)
 {
 	struct parser_state *state = yyget_extra(scanner);
 	struct input_descriptor *indesc;
 	YY_BUFFER_STATE b;
 
-	b = yy_create_buffer(nft->f[state->indesc_idx], YY_BUF_SIZE, scanner);
+	b = yy_create_buffer(f, YY_BUF_SIZE, scanner);
 	yypush_buffer_state(b, scanner);
 
 	indesc = xzalloc(sizeof(struct input_descriptor));
@@ -706,6 +706,7 @@ static void scanner_push_file(struct nft_ctx *nft, void *scanner,
 		indesc->location = *loc;
 	indesc->type	= INDESC_FILE;
 	indesc->name	= xstrdup(filename);
+	indesc->f = f;
 	init_pos(indesc);
 
 	scanner_push_indesc(state, indesc);
@@ -731,8 +732,7 @@ static int include_file(struct nft_ctx *nft, void *scanner,
 			     filename, strerror(errno));
 		goto err;
 	}
-	nft->f[state->indesc_idx] = f;
-	scanner_push_file(nft, scanner, filename, loc);
+	scanner_push_file(nft, scanner, f, filename, loc);
 	return 0;
 err:
 	erec_queue(erec, state->msgs);
@@ -944,6 +944,10 @@ static void input_descriptor_list_destroy(struct parser_state *state)
 	struct input_descriptor *indesc, *next;
 
 	list_for_each_entry_safe(indesc, next, &state->indesc_list, list) {
+		if (indesc->f) {
+			fclose(indesc->f);
+			indesc->f = NULL;
+		}
 		list_del(&indesc->list);
 		input_descriptor_destroy(indesc);
 	}
@@ -955,11 +959,6 @@ void scanner_destroy(struct nft_ctx *nft)
 
 	do {
 		yypop_buffer_state(nft->scanner);
-
-		if (nft->f[state->indesc_idx]) {
-			fclose(nft->f[state->indesc_idx]);
-			nft->f[state->indesc_idx] = NULL;
-		}
 	} while (state->indesc_idx--);
 
 	input_descriptor_list_destroy(state);
-- 
2.20.1