add: endpoint /tags

fix: leaks from config (now using static length for config strings)

models/tag.c

@@ -77,6 +77,50 @@ tag_get_tag(int id)
     return result;
 }
 
+char**
+tag_get_all()
+{
+    sqlite3_stmt *stmt;
+
+    sqlite3_prepare_v2(global_database, "SELECT tag FROM tags;", -1, &stmt, NULL);
+
+    char **all_tags = malloc(sizeof(char*));
+
+    int row = 0;
+
+    while(true)
+    {
+        int s;
+
+        s = sqlite3_step(stmt);
+        if (s == SQLITE_ROW)
+        {
+            const char *new_tag = (const char *)sqlite3_column_text(stmt, 0);
+            int new_tag_len = strlen(new_tag);
+            row++;
+
+            all_tags = (char**)realloc(all_tags, sizeof(char*) * (row + 1));
+            all_tags[row - 1] = malloc(sizeof(char) * (new_tag_len + 1));
+            strcpy(all_tags[row - 1], new_tag);
+        }
+        else
+        {
+            if(s == SQLITE_DONE)
+            {
+                break;
+            }
+            else
+            {
+                LOG_ERROR("error selecting tags from database: %s\n", sqlite3_errstr(s));
+                break;
+            }
+        }
+    }
+    sqlite3_finalize(stmt);
+    all_tags[row] = NULL;
+    return all_tags;
+}
+
 int
 tag_get_id(const char *tag)
 {