Check for duplicates

1 files changed, 23 insertions, 1 deletions

diff --git a/pom.c b/pom.c
index d0d8406..5846226 100644
--- a/pom.c
+++ b/pom.c
@@ -926,7 +926,29 @@ parser_finish(struct parser *parser) {
 #endif
 	}
 	qsort(items, items_count, sizeof *items, conf_item_cmp_qsort);
-	// TODO: check for duplicates
+	for (size_t i = 0; i + 1 < items_count; i++) {
+		struct conf_item *item1 = &items[i];
+		struct conf_item *item2 = &items[i+1];
+		if (strcmp(item1->key, item2->key) != 0) {
+			// OK
+			continue;
+		}
+		uint64_t min_line, max_line;
+		if (item1->line < item2->line) {
+			min_line = item1->line;
+			max_line = item2->line;
+		} else {
+			min_line = item2->line;
+			max_line = item1->line;
+		}
+		parser->line_number = max_line;
+		parser_error(parser, "Re-definition of %s (previously defined on line %" PRIu64 ")",
+			item1->key, min_line);
+	}
+	if (parser->errors.count) {
+		conf_free(conf);
+		return NULL;
+	}
 
 	pom_conf *root = conf_calloc(conf, 1, sizeof *root);
 	if (!root) goto out_of_memory;