From 24ce486813103f5f8037b4386a53fa11d1632253 Mon Sep 17 00:00:00 2001
From: Thorsten Töpper <atsutane@freethoughts.de>
Date: Mon, 10 Jan 2011 20:45:59 +0100
Subject: Aufgabe 2: statistic implementiert, kleinere Schönheitskorrekturen.
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---
 aufgabe2/statistic.c | 41 +++++++++++++++++++++++++++++++++++++++--
 1 file changed, 39 insertions(+), 2 deletions(-)

(limited to 'aufgabe2/statistic.c')

diff --git a/aufgabe2/statistic.c b/aufgabe2/statistic.c
index b83776a..31230cf 100644
--- a/aufgabe2/statistic.c
+++ b/aufgabe2/statistic.c
@@ -1,18 +1,55 @@
 /*
  * vim:ts=4:sw=4:expandtab
- * 
+ *
  */
 #include <stdlib.h>
 #include <stdio.h>
 #include <unistd.h>
 
+#include "queue.h"
+
+FILE *pipe_conv;
+FILE *pipe_mon;
+char *message;
+
 void statistic() {
+    int current_value = 0, last_value = 0, result;
+
     printf("statistic started\n");
-    for (;;) {
+
+    /* Die Pipe zum conv Prozess lesend öffnen, die zum monitor schreibend */
+    if (((pipe_conv = fdopen(queue[D_CONV_TO_STAT][READ], "r")) == NULL) ||
+        ((pipe_mon = fdopen(queue[D_STAT_TO_MON][WRITE], "w")) == NULL)) {
+        perror("statistic.c fdopen()");
+        exit(EXIT_FAILURE);
+    }
+
+    /* Speicher für Nachricht reservieren */
+    if ((message = calloc(1, sizeof(char)*SIZE_HEX+1)) == NULL) {
+        perror("statistic.c calloc()");
+        exit(EXIT_FAILURE);
+    }
+
+    /*
+     * Auslesen der Nachrichten vom conv Prozess, Hälfte des Wertest mit der
+     * des letzten Wert addieren und an den monitor Prozess schicken.
+     */
+    while (fgets(message, SIZE_HEX+1, pipe_conv)) {
+        sscanf(message, "%x\n", &current_value); /* HEX -> DEC */
+
+        result = current_value/2 + last_value/2;
+        fprintf(pipe_mon, "%x\n", result);
+
+        last_value = current_value;
     }
 }
 
 void statistic_cleanup() {
     printf("statistic cleanup\n");
+    fclose(pipe_conv);
+    fclose(pipe_mon);
+    free(message);
+    close(queue[D_CONV_TO_STAT][READ]);
+    close(queue[D_STAT_TO_MON][WRITE]);
     _exit(EXIT_SUCCESS);
 }
-- 
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