Add cron functionality

apps/time/resource_crontab.c

@@ -0,0 +1,118 @@
+/**
+ * \file
+ *      Resource for crontab entry
+ * \author
+ *      Ralf Schlatterbeck <rsc@runtux.com>
+ *
+ * \brief get/put crontab entry
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "contiki.h"
+#include "time_resource.h"
+#include "jsonparse.h"
+#include "er-coap.h"
+#include "generic_resource.h"
+#include "cron.h"
+
+static size_t get_index_from_uri (const char *uri)
+{
+  const char *s;
+  char *endptr;
+  size_t idx;
+  if (uri == NULL) {
+    return MAX_CRON_ENTRIES;
+  }
+  if (NULL == (s = strrchr (uri, '/'))) {
+    return MAX_CRON_ENTRIES;
+  }
+  idx = strtoul (s+1, &endptr, 10);
+  if (s == endptr || *endptr != '\0') {
+    return MAX_CRON_ENTRIES;
+  }
+  return idx;
+}
+
+int crontab_from_string (const char *name, const char *uri, const char *s)
+{
+  const char *err;
+  int res;
+  size_t idx = get_index_from_uri (uri);
+  if (idx >= MAX_CRON_ENTRIES) {
+    return -1;
+  }
+  res = parse_crontab_line (s, get_cron_entry (idx), &err);
+  if (res < 0) {
+    printf ("Error parsing: %s\n", err);
+    return -1;
+  }
+  return 0;
+}
+
+size_t
+crontab_to_string (const char *name, const char *uri, char *buf, size_t bsize)
+{
+  /* FIXME: For now we only return "valid" or "invalid" until someone
+   * comes up with a clever algorithm to reconstruct a crontab string
+   * from the cron_entry struct.
+   */
+  size_t idx = get_index_from_uri (uri);
+  struct cron_entry *e;
+  if (idx >= MAX_CRON_ENTRIES) {
+    return MAX_GET_STRING_LENGTH;
+  }
+  e = get_cron_entry (idx);
+  if (e->flags & VALID) {
+    return snprintf (buf, bsize, "valid");
+  }
+  return snprintf (buf, bsize, "invalid");
+}
+
+GENERIC_RESOURCE
+  ( crontab
+  , crontab-entry
+  , s
+  , 1
+  , crontab_from_string
+  , crontab_to_string
+  );
+
+/* Allocate all cron entries and the necessary resources */
+void activate_cron_resources (void)
+{
+  size_t n;
+  for (n=0; n<MAX_CRON_ENTRIES; n++) {
+    resource_t *res;
+    char *buf;
+    size_t len;
+    struct cron_entry *e;
+    char name [15];
+    /* Need to copy the resource because resource->url holds the path
+     * under which we activate it using rest_activate_resource
+     */
+    if (NULL == (res = malloc (sizeof (*res)))) {
+        printf ("Error malloc\n");
+        break;
+    }
+    memcpy (res, &res_crontab, sizeof (*res));
+    e = allocate_cron_entry ();
+    assert (!(e->flags & VALID));
+    len = snprintf (name, sizeof (name), "crontab/%u", n);
+    name [sizeof (name) -1] = '\0';
+    assert (len < 15);
+    if (NULL == (buf = malloc (len + 1))) {
+        printf ("Error malloc\n");
+        break;
+    }
+    strcpy (buf, name);
+    rest_activate_resource (res, buf);
+  }
+}
+
+/*
+ * VI settings, see coding style
+ * ex:ts=8:et:sw=2
+ */
+