[ovs-dev] [join ovsdb schema v2 6/8] ovsdb: add logic for parsing schema file names from a string

[Andy Zhou]

Any ovsdb programs that accepts a single schema file name will be
extended to accept multiple file names. This patch implements the
parsing logic for future patches.

Signed-off-by: Andy Zhou <azhou at nicira.com>
---
 ovsdb/ovsdb.c | 38 ++++++++++++++++++++++++++++++++++++++
 ovsdb/ovsdb.h |  2 ++
 2 files changed, 40 insertions(+)

diff --git a/ovsdb/ovsdb.c b/ovsdb/ovsdb.c
index 5929306..5305360 100644
--- a/ovsdb/ovsdb.c
+++ b/ovsdb/ovsdb.c
@@ -24,6 +24,7 @@
 #include "ovsdb-parser.h"
 #include "ovsdb-types.h"
 #include "simap.h"
+#include "sset.h"
 #include "table.h"
 #include "transaction.h"
 
@@ -673,3 +674,40 @@ error:
 
     return err;
 }
+
+/*
+ * Parse schema file names from a string.
+ *
+ * A leading comma indicates the default schema name.
+ *
+ * Duplicated filenames will be ignored.   */
+void
+ovsdb_parse_schema_file_names(const char *file_names, struct sset *name_set,
+                              const char *default_schema)
+{
+    const char *delimiter=", \t\r\n";
+    const char *filename;
+    char *saveptr;
+    char *fns;
+
+    if (!file_names) {
+        sset_add(name_set, default_schema);
+        return;
+    }
+
+    if (*file_names == ',') {
+        sset_add(name_set, default_schema);
+    }
+
+    fns = xstrdup(file_names);
+    filename = strtok_r(fns, delimiter, &saveptr);
+    if (!filename) {
+        filename = default_schema;
+    }
+
+    while(filename) {
+        sset_add(name_set, filename);
+        filename = strtok_r(NULL, delimiter, &saveptr);
+    }
+    free(fns);
+}
diff --git a/ovsdb/ovsdb.h b/ovsdb/ovsdb.h
index 2e7f7e0..b61b6ba 100644
--- a/ovsdb/ovsdb.h
+++ b/ovsdb/ovsdb.h
@@ -56,6 +56,8 @@ struct shash *ovsdb_schemas_clone(const struct shash *schemas);
 struct ovsdb_error *ovsdb_schemas_from_files(const struct sset *files,
                                              struct shash** )
     OVS_WARN_UNUSED_RESULT;
+void ovsdb_parse_schema_file_names(const char *file_names, struct sset *names,
+                                   const char *default_schema);
 void ovsdb_schemas_destroy(struct shash *schemas);
 struct json *ovsdb_schemas_to_json(const struct shash *schemas)
     OVS_WARN_UNUSED_RESULT;
-- 
1.9.1