curl_json plugin: Use the "number" callback of libyajl.

The "integer" callback only works with "long"s, which are 32bit on
x86 and other 32bit architectures. The "number" callback gets the raw
string for us to parse ourselves – honoring the data source type in the
process.

The "integer" and "double" callbacks have been removed, since they are not
used if the "number" callback is present.

src/curl_json.c

@@ -1,7 +1,7 @@
 /**
  * collectd - src/curl_json.c
  * Copyright (C) 2009       Doug MacEachern
- * Copyright (C) 2006-2009  Florian octo Forster
+ * Copyright (C) 2006-2010  Florian octo Forster
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License as published by the
@@ -130,59 +130,57 @@ static int cj_get_type (cj_key_t *key)
 }
 
 /* yajl callbacks */
-static int cj_cb_integer (void *ctx, long val)
+#define CJ_CB_ABORT    0
+#define CJ_CB_CONTINUE 1
+
+/* "number" may not be null terminated, so copy it into a buffer before
+ * parsing. */
+static int cj_cb_number (void *ctx,
+    const char *number, unsigned int number_len)
 {
+  char buffer[number_len + 1];
+
   cj_t *db = (cj_t *)ctx;
   cj_key_t *key = db->state[db->depth].key;
+  char *endptr;
+  value_t vt;
+  int type;
 
-  if (key != NULL)
-  {
-    value_t vt;
-    int type;
+  if (key == NULL)
+    return (CJ_CB_CONTINUE);
 
-    type = cj_get_type (key);
-    if (type == DS_TYPE_COUNTER)
-      vt.counter = (counter_t) val;
-    else if (type == DS_TYPE_GAUGE)
-      vt.gauge = (gauge_t) val;
-    else if (type == DS_TYPE_DERIVE)
-      vt.derive = (derive_t) val;
-    else if (type == DS_TYPE_ABSOLUTE)
-      vt.absolute = (absolute_t) val;
-    else
-      return 0;
+  memcpy (buffer, number, number_len);
+  buffer[sizeof (buffer) - 1] = 0;
 
-    cj_submit (db, key, &vt);
-  }
-  return 1;
-}
+  type = cj_get_type (key);
 
-static int cj_cb_double (void *ctx, double val)
-{
-  cj_t *db = (cj_t *)ctx;
-  cj_key_t *key = db->state[db->depth].key;
+  endptr = NULL;
+  errno = 0;
 
-  if (key != NULL)
+  if (type == DS_TYPE_COUNTER)
+    vt.counter = (counter_t) strtoull (buffer, &endptr, /* base = */ 0);
+  else if (type == DS_TYPE_GAUGE)
+    vt.gauge = (gauge_t) strtod (buffer, &endptr);
+  else if (type == DS_TYPE_DERIVE)
+    vt.derive = (derive_t) strtoll (buffer, &endptr, /* base = */ 0);
+  else if (type == DS_TYPE_ABSOLUTE)
+    vt.absolute = (absolute_t) strtoull (buffer, &endptr, /* base = */ 0);
+  else
   {
-    value_t vt;
-    int type;
-
-    type = cj_get_type (key);
-    if (type == DS_TYPE_COUNTER)
-      vt.counter = (counter_t) val;
-    else if (type == DS_TYPE_GAUGE)
-      vt.gauge = (gauge_t) val;
-    else if (type == DS_TYPE_DERIVE)
-      vt.derive = (derive_t) val;
-    else if (type == DS_TYPE_ABSOLUTE)
-      vt.absolute = (absolute_t) val;
-    else
-      return 0;
+    ERROR ("curl_json plugin: Unknown data source type: \"%s\"", key->type);
+    return (CJ_CB_ABORT);
+  }
 
-    cj_submit (db, key, &vt);
+  if ((endptr == &buffer[0]) || (errno != 0))
+  {
+    NOTICE ("curl_json plugin: Overflow while parsing number. "
+        "Ignoring this value.");
+    return (CJ_CB_CONTINUE);
   }
-  return 1;
-}
+
+  cj_submit (db, key, &vt);
+  return (CJ_CB_CONTINUE);
+} /* int cj_cb_number */
 
 static int cj_cb_map_key (void *ctx, const unsigned char *val,
                             unsigned int len)
@@ -287,9 +285,9 @@ static int cj_cb_end_array (void * ctx)
 static yajl_callbacks ycallbacks = {
   NULL, /* null */
   NULL, /* boolean */
-  cj_cb_integer,
-  cj_cb_double,
-  NULL, /* number */
+  NULL, /* integer */
+  NULL, /* double */
+  cj_cb_number,
   cj_cb_string,
   cj_cb_start_map,
   cj_cb_map_key,