csv plugin: Re-implement value_list_to_filename().

The new implementation is faster, because it doesn't use snprintf().

diff --git a/src/csv.c b/src/csv.c
index 02d62c1..afb4f83 100644 (file)
--- a/src/csv.c
+++ b/src/csv.c
@@ -121,65 +121,49 @@ static int value_list_to_string (char *buffer, int buffer_len,
        return (0);
 } /* int value_list_to_string */
 
-static int value_list_to_filename (char *buffer, int buffer_len,
-               const data_set_t *ds, const value_list_t *vl)
+static int value_list_to_filename (char *buffer, size_t buffer_size,
+               value_list_t const *vl)
 {
-       int offset = 0;
        int status;
 
-       assert (0 == strcmp (ds->type, vl->type));
-
-       if (datadir != NULL)
-       {
-               status = ssnprintf (buffer + offset, buffer_len - offset,
-                               "%s/", datadir);
-               if ((status < 1) || (status >= buffer_len - offset))
-                       return (-1);
-               offset += status;
-       }
+       char *ptr;
+       size_t ptr_size;
+       time_t now;
+       struct tm struct_tm;
 
-       status = ssnprintf (buffer + offset, buffer_len - offset,
-                       "%s/", vl->host);
-       if ((status < 1) || (status >= buffer_len - offset))
-               return (-1);
-       offset += status;
+       status = FORMAT_VL (buffer, buffer_size, vl);
+       if (status != 0)
+               return (status);
 
-       if (strlen (vl->plugin_instance) > 0)
-               status = ssnprintf (buffer + offset, buffer_len - offset,
-                               "%s-%s/", vl->plugin, vl->plugin_instance);
-       else
-               status = ssnprintf (buffer + offset, buffer_len - offset,
-                               "%s/", vl->plugin);
-       if ((status < 1) || (status >= buffer_len - offset))
-               return (-1);
-       offset += status;
+       /* Skip all the time formatting stuff when printing to STDOUT or
+        * STDERR. */
+       if (use_stdio)
+               return (0);
 
-       if (strlen (vl->type_instance) > 0)
-               status = ssnprintf (buffer + offset, buffer_len - offset,
-                               "%s-%s", vl->type, vl->type_instance);
-       else
-               status = ssnprintf (buffer + offset, buffer_len - offset,
-                               "%s", vl->type);
-       if ((status < 1) || (status >= buffer_len - offset))
-               return (-1);
-       offset += status;
+       ptr_size = buffer_size - strlen (buffer);
+       ptr = buffer + strlen (buffer);
 
-       if (!use_stdio)
+       /* "-2013-07-12" => 11 bytes */
+       if (ptr_size < 12)
        {
-               time_t now;
-               struct tm stm;
+               ERROR ("csv plugin: Buffer too small.");
+               return (ENOMEM);
+       }
 
-               /* TODO: Find a way to minimize the calls to `localtime_r',
-                * since they are pretty expensive.. */
-               now = time (NULL);
-               if (localtime_r (&now, &stm) == NULL)
-               {
-                       ERROR ("csv plugin: localtime_r failed");
-                       return (1);
-               }
+       /* TODO: Find a way to minimize the calls to `localtime_r',
+        * since they are pretty expensive.. */
+       now = time (NULL);
+       if (localtime_r (&now, &struct_tm) == NULL)
+       {
+               ERROR ("csv plugin: localtime_r failed");
+               return (-1);
+       }
 
-               strftime (buffer + offset, buffer_len - offset,
-                               "-%Y-%m-%d", &stm);
+       status = strftime (ptr, ptr_size, "-%Y-%m-%d", &struct_tm);
+       if (status == 0) /* yep, it returns zero on error. */
+       {
+               ERROR ("csv plugin: strftime failed");
+               return (-1);
        }
 
        return (0);
@@ -275,7 +259,8 @@ static int csv_write (const data_set_t *ds, const value_list_t *vl,
                return -1;
        }
 
-       if (value_list_to_filename (filename, sizeof (filename), ds, vl) != 0)
+       status = value_list_to_filename (filename, sizeof (filename), vl);
+       if (status != 0)
                return (-1);
 
        DEBUG ("csv plugin: csv_write: filename = %s;", filename);