This patch fixes segfaults.

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diff -rauw /gateway-cvs/test/test_hmac.c /gateway/test/test_hmac.c
--- /gateway-cvs/test/test_hmac.c  2009-01-14 10:24:21.000000000 +0100
+++ /gateway/test/test_hmac.c  2009-02-06 14:35:41.000000000 +0100
@@ -95,10 +95,18 @@
 
     get_and_set_debugs(argc, argv, NULL);
 
+    if (argc < 3) {
+        printf("Syntax: %s <file>\n", argv[0]);
+        return -1;
+    }
+  
     key = octstr_create(argv[1]);    
     filename = octstr_create(argv[2]);
     data = octstr_read_file(octstr_get_cstr(filename));
 
+    if (data == NULL)
+        panic(0, "Cannot read file.");
+
     debug("",0,"Dumping file `%s':", octstr_get_cstr(filename));
     octstr_dump(data, 0);
 
diff -rauw /gateway-cvs/test/test_md5.c /gateway/test/test_md5.c
--- /gateway-cvs/test/test_md5.c 2009-01-14 10:24:21.000000000 +0100
+++ /gateway/test/test_md5.c   2009-02-06 14:38:29.000000000 +0100
@@ -74,6 +74,11 @@
 
     get_and_set_debugs(argc, argv, NULL);
 
+    if (argc < 2) {
+        printf("Syntax: %s <txt>\n", argv[0]);
+        return -1;
+    }
+
     data = octstr_create(argv[1]);
     enc = md5(data);
 
diff -rauw /gateway-cvs/test/test_octstr_dump.c /gateway/test/test_octstr_dump.c
--- /gateway-cvs/test/test_octstr_dump.c 2009-01-14 10:24:21.000000000 +0100
+++ /gateway/test/test_octstr_dump.c   2009-02-06 14:32:29.000000000 +0100
@@ -74,9 +74,17 @@
 
     get_and_set_debugs(argc, argv, NULL);
 
+    if (argc < 2) {
+        printf("Syntax: %s <file>\n", argv[0]);
+        return -1;
+    }
+
     filename = octstr_create(argv[1]);
     data = octstr_read_file(octstr_get_cstr(filename));
 
+    if (data == NULL)
+        panic(0, "Cannot read file.");
+
     /* 
      * We test if this is a text/plain file with hex values in it.
      * Therefore copy the data and trail off any CR and LF from 
diff -rauw /gateway-cvs/test/test_regex.c /gateway/test/test_regex.c
--- /gateway-cvs/test/test_regex.c 2009-01-14 10:24:22.000000000 +0100
+++ /gateway/test/test_regex.c 2009-02-06 14:40:11.000000000 +0100
@@ -81,6 +81,11 @@
 
     get_and_set_debugs(argc, argv, NULL);
 
+    if (argc < 4) {
+        printf("Syntax: %s <os> <re> <sub>\n", argv[0]);
+        return -1;
+    }
+
     os = octstr_create(argv[1]);
     re = octstr_create(argv[2]);
     sub = octstr_create(argv[3]);

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