Enhancement in ttail init checking function

To handle case where none of the file given as argument is readable

src/ttail_init.c

@@ -144,6 +144,25 @@ given\n");
 
 int ttail_init_check(ttail_t* t)
 {
+	size_t i, ret;
+	if(t->logfile_sz)
+	{
+		ret = 0;
+		for(i=0; i<t->logfile_sz; i++)
+		{
+			if(t->logfile[i])
+			{
+				ret = 1;
+				break;
+			}
+		}
+		if(!ret)
+		{
+			fprintf(stderr, "Unable to read from any of the files \
+given as argument\n");
+			return -1;
+		}
+	}
 	if(t->flag & TTAIL_FLAG_DATE_MAX)
 	{
 		fprintf(stderr, "Warning : date-max not yet implemented\n");
@@ -198,6 +217,7 @@ int ttail_add_logfile(ttail_t* res, const char* filename)
 	if(!fp)
 	{
 		fprintf(stderr, "Unable to open file : %s\n", filename);
+		res->logfile[res->logfile_sz-1] = NULL;
 		ret = 1;
 	}
 	res->logfile[res->logfile_sz-1] = fp;

tests/ttail_search_check.c

@@ -321,7 +321,7 @@ START_TEST (test_search_files1)
 	ttail_set_fmt(ttail, "%B%n%d %H:%M");
 
 	ret = _ttail_search_closest_files(ttail, &tm);
-	ck_assert_int_eq(ret, 1);
+	ck_assert_int_eq(ret, 0);
 	ck_assert(ttail->session->file.id == 0);
 	ck_assert(ttail->session->file.off == 0);
 }