From deb77f01ce96ff9b46cd8706fabd6ee6b6b17f22 Mon Sep 17 00:00:00 2001
From: midipix <writeonce@midipix.org>
Date: Oct 26 2016 03:01:59 +0000
Subject: sfrt_map_input(): improved error trace support.


---

diff --git a/src/logic/sfrt_map_input.c b/src/logic/sfrt_map_input.c
index 77cc40e..d73ace6 100644
--- a/src/logic/sfrt_map_input.c
+++ b/src/logic/sfrt_map_input.c
@@ -29,9 +29,16 @@ int sfrt_map_input(
 	if ((ret = fstat(fd,&st) < 0) && fnew)
 		close(fd);
 
+	else if ((st.st_size == 0) && fnew)
+		close(fd);
+
 	if (ret < 0)
 		return SFRT_SYSTEM_ERROR(dctx);
 
+	else if (st.st_size == 0)
+		return SFRT_CUSTOM_ERROR(
+			dctx,SFRT_ERR_SOURCE_SIZE_ZERO);
+
 	map->size = st.st_size;
 	map->addr = mmap(0,map->size,prot,MAP_PRIVATE,fd,0);