X-Git-Url: https://git.octo.it/?a=blobdiff_plain;f=common.c;h=dab0b70f52c7038dc1abc82cef872d3546e3e375;hb=b2db68ebb7acdb345c07985fcdb35dcfbb36d4aa;hp=ec267af957a80ea15ff5707a671d3ee9903512cf;hpb=4bd1536081d134fdb0d21067d0c7ddcdc422e6c9;p=collection4.git

diff --git a/common.c b/common.c
index ec267af..dab0b70 100644
--- a/common.c
+++ b/common.c
@@ -1,5 +1,7 @@
 #include <stdlib.h>
 #include <stdio.h>
+#include <stdint.h>
+#include <inttypes.h>
 #include <string.h>
 #include <errno.h>
 #include <sys/types.h>
@@ -7,8 +9,12 @@
 #include <unistd.h>
 #include <dirent.h>
 #include <assert.h>
+#include <math.h>
+
+#include <rrd.h>
 
 #include "common.h"
+#include "graph_list.h"
 
 static int foreach_rrd_file (const char *dir, /* {{{ */
     int (*callback) (const char *, void *),
@@ -170,6 +176,128 @@ size_t c_strlcat (char *dst, const char *src, size_t size) /* {{{ */
   return (retval);
 } /* }}} size_t c_strlcat */
 
+int ds_list_from_rrd_file (char *file, /* {{{ */
+    size_t *ret_dses_num, char ***ret_dses)
+{
+  char *rrd_argv[] = { "info", file, NULL };
+  int rrd_argc = (sizeof (rrd_argv) / sizeof (rrd_argv[0])) - 1;
+
+  rrd_info_t *info;
+  rrd_info_t *ptr;
+
+  char **dses = NULL;
+  size_t dses_num = 0;
+
+  info = rrd_info (rrd_argc, rrd_argv);
+  if (info == NULL)
+  {
+    printf ("%s: rrd_info (%s) failed.\n", __func__, file);
+    return (-1);
+  }
+
+  for (ptr = info; ptr != NULL; ptr = ptr->next)
+  {
+    size_t keylen;
+    size_t dslen;
+    char *ds;
+    char **tmp;
+
+    if (strncmp ("ds[", ptr->key, strlen ("ds[")) != 0)
+      continue;
+
+    keylen = strlen (ptr->key);
+    if (keylen < strlen ("ds[?].index"))
+      continue;
+
+    dslen = keylen - strlen ("ds[].index");
+    assert (dslen >= 1);
+
+    if (strcmp ("].index", ptr->key + (strlen ("ds[") + dslen)) != 0)
+      continue;
+
+    ds = malloc (dslen + 1);
+    if (ds == NULL)
+      continue;
+
+    memcpy (ds, ptr->key + strlen ("ds["), dslen);
+    ds[dslen] = 0;
+
+    tmp = realloc (dses, sizeof (*dses) * (dses_num + 1));
+    if (tmp == NULL)
+    {
+      free (ds);
+      continue;
+    }
+    dses = tmp;
+
+    dses[dses_num] = ds;
+    dses_num++;
+  }
+
+  rrd_info_free (info);
+
+  if (dses_num < 1)
+  {
+    assert (dses == NULL);
+    return (ENOENT);
+  }
+
+  *ret_dses_num = dses_num;
+  *ret_dses = dses;
+
+  return (0);
+} /* }}} int ds_list_from_rrd_file */
+
+static int hsv_to_rgb (double *hsv, double *rgb) /* {{{ */
+{
+  double c = hsv[2] * hsv[1];
+  double h = hsv[0] / 60.0;
+  double x = c * (1.0 - fabs (fmod (h, 2.0) - 1));
+  double m = hsv[2] - c;
+
+  rgb[0] = 0.0;
+  rgb[1] = 0.0;
+  rgb[2] = 0.0;
+
+       if ((0.0 <= h) && (h < 1.0)) { rgb[0] = 1.0; rgb[1] = x; rgb[2] = 0.0; }
+  else if ((1.0 <= h) && (h < 2.0)) { rgb[0] = x; rgb[1] = 1.0; rgb[2] = 0.0; }
+  else if ((2.0 <= h) && (h < 3.0)) { rgb[0] = 0.0; rgb[1] = 1.0; rgb[2] = x; }
+  else if ((3.0 <= h) && (h < 4.0)) { rgb[0] = 0.0; rgb[1] = x; rgb[2] = 1.0; }
+  else if ((4.0 <= h) && (h < 5.0)) { rgb[0] = x; rgb[1] = 0.0; rgb[2] = 1.0; }
+  else if ((5.0 <= h) && (h < 6.0)) { rgb[0] = 1.0; rgb[1] = 0.0; rgb[2] = x; }
+
+  rgb[0] += m;
+  rgb[1] += m;
+  rgb[2] += m;
+
+  return (0);
+} /* }}} int hsv_to_rgb */
+
+static uint32_t rgb_to_uint32 (double *rgb) /* {{{ */
+{
+  uint8_t r;
+  uint8_t g;
+  uint8_t b;
+
+  r = (uint8_t) (255.0 * rgb[0]);
+  g = (uint8_t) (255.0 * rgb[1]);
+  b = (uint8_t) (255.0 * rgb[2]);
+
+  return ((((uint32_t) r) << 16)
+      | (((uint32_t) g) << 8)
+      | ((uint32_t) b));
+} /* }}} uint32_t rgb_to_uint32 */
+
+uint32_t get_random_color (void) /* {{{ */
+{
+  double hsv[3] = { 0.0, 1.0, 1.0 };
+  double rgb[3] = { 0.0, 0.0, 0.0 };
+
+  hsv[0] = 360.0 * ((double) rand ()) / (((double) RAND_MAX) + 1.0);
+
+  hsv_to_rgb (hsv, rgb);
 
+  return (rgb_to_uint32 (rgb));
+} /* }}} uint32_t get_random_color */
 
 /* vim: set sw=2 sts=2 et fdm=marker : */