* Fix segmentation fault with -O2 while unpacking (thanks for reporting) * Various random checks to ensure read/write ops are success

src/main.h

@@ -102,7 +102,7 @@ extern char *modes[];
 extern char *root_devices[];
 
 // fiasco
-int openfiasco(char *name, const char *grep, int v);
+int openfiasco(const char *name, const char *grep, int v);
 int fiasco_new(const char *filename, const char *name);
 void fiasco_data_read(struct header_t *header);
 int fiasco_add_eof(int fd);