--- joko/Uni/BSArch/01/prime.c	2006/05/15 11:27:10	1.16
+++ joko/Uni/BSArch/01/prime.c	2006/05/15 11:36:52	1.17
@@ -1,4 +1,4 @@
-/* $Id: prime.c,v 1.16 2006/05/15 11:27:10 franky Exp $ */
+/* $Id: prime.c,v 1.17 2006/05/15 11:36:52 franky Exp $ */
 
 #include <stdio.h>
 #include <stdlib.h>
@@ -50,6 +50,7 @@
 	if (*endptr != '\0') {
 		char message[256];
 		snprintf(message, 255, "Could not convert '%s' to a valid (integer) number.", nptr);
+		errno=EINVAL;
 		if(warn) 
 			PRINTWARNING(message);
 		else{
@@ -63,6 +64,7 @@
 	if (errno == ERANGE) {
 		char message[256];
 		snprintf(message, 255, "Number is not in range of 'long int': %s", nptr);
+		errno=EINVAL;
 		if(warn)
 			PRINTWARNING(message);
 		else{			
@@ -98,10 +100,11 @@
 		/* try to open file for reading */
 		FILE * fp = fopen(argv[1], "r");
 		err=errno;
+		errno=0;
 		/* (1) test-single-number mode: first argument is not a filename */
 		if (fp == NULL) {
 			long int number = convert_number(argv[1],TRUE);
-			if(err){
+			if(errno){
 				fprintf(stderr, "%s: %s\n", argv[1], strerror(err));
 				return -1;
 			}