graph_ident.[ch]: Move the graph_ident_t data structure into an own module.

[collection4.git] / common.c

diff --git a/common.c b/common.c
index 5d2a67d..15fbe6a 100644 (file)
--- 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>
@@ -7,12 +9,16 @@
 #include <unistd.h>
 #include <dirent.h>
 #include <assert.h>
+#include <math.h>
 
 #include <rrd.h>
 
 #include "common.h"
 #include "graph_list.h"
 
+#include <fcgiapp.h>
+#include <fcgi_stdio.h>
+
 static int foreach_rrd_file (const char *dir, /* {{{ */
     int (*callback) (const char *, void *),
     void *user_data)
@@ -245,4 +251,76 @@ int ds_list_from_rrd_file (char *file, /* {{{ */
   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 */
+
+int print_debug (const char *format, ...) /* {{{ */
+{
+  static _Bool have_header = 0;
+
+  va_list ap;
+  int status;
+
+  if (!have_header)
+  {
+    printf ("Content-Type: text/plain\n\n");
+    have_header = 1;
+  }
+
+  va_start (ap, format);
+  status = vprintf (format, ap);
+  va_end (ap);
+
+  return (status);
+} /* }}} int print_debug */
+
 /* vim: set sw=2 sts=2 et fdm=marker : */