--- joko/Uni/BSArch/04/bmp_fractal.c	2006/07/02 12:33:35	1.17
+++ joko/Uni/BSArch/04/bmp_fractal.c	2006/07/02 12:41:56	1.18
@@ -5,7 +5,7 @@
  * Uebung 4.4 
  */
 
-// $Id: bmp_fractal.c,v 1.17 2006/07/02 12:33:35 joko Exp $
+// $Id: bmp_fractal.c,v 1.18 2006/07/02 12:41:56 joko Exp $
 
 #include <windows.h>
 #include <stdio.h>
@@ -217,7 +217,7 @@
 
   // check command line arguments
   if (argc < 2) {
-    fprintf(stderr, "Can not run without arguments!\nPlease specify '-t {number of threads}' or '-p {number of processes}' and an image filename.\n");
+    fprintf(stderr, "Error: Can not run without arguments!\nPlease specify '-t {number of threads}' or '-p {number of processes}' and an image filename.\n");
     exit(EXIT_FAILURE);
   }
 
@@ -233,7 +233,7 @@
   
   } else if (scan_argv(argc, argv, "-p", arg_value)) {
     if (strlen(arg_value) == 0) {
-      fprintf(stderr, "Please specify number of processes!\n");
+      fprintf(stderr, "Error: Please specify number of processes!\n");
       exit(EXIT_FAILURE);
     }
     use_processes = TRUE;
@@ -241,16 +241,20 @@
     workers = atoi(arg_value);
   
   } else if (scan_argv(argc, argv, "-t", arg_value)) {
-    if (strlen(arg_value) == 0) {
-      fprintf(stderr, "Please specify number of threads!\n");
+    
+    if (strlen(arg_value) == 0)
+      fprintf(stderr, "Error: Please specify number of threads!\n"),
       exit(EXIT_FAILURE);
-    }
+    
     use_processes = FALSE;
     is_worker_process = FALSE;
     workers = atoi(arg_value);
     
   }
-  
+
+  if (!is_worker_process && workers < 1)
+    fprintf(stderr, "Error: Number of threads/processes must be >0!\n"),
+    exit(EXIT_FAILURE);
   
   if (VERBOSE && use_processes) {
     fprintf(stdout, "===================================================== ");
@@ -265,7 +269,7 @@
   if (!is_worker_process) {
     
     if (argc < 4) {
-      fprintf(stderr, "Must give filename of image as third argument!\n");
+      fprintf(stderr, "Error: Must give filename of image as third argument!\n");
       exit(EXIT_FAILURE);
     }