Security review: check results of snprintf.

Calls marked with xSnprintf shouldn't fail.
Abort program cleanly if any of them does.

1 files changed, 3 insertions, 0 deletions

diff --git a/XAlloc.h b/XAlloc.h
index eaebb087..2ebee1a8 100644
--- a/XAlloc.h
+++ b/XAlloc.h
@@ -7,6 +7,7 @@
 #define _GNU_SOURCE
 #endif
 
+#include <err.h>
 #include <assert.h>
 #include <stdlib.h>
 
@@ -16,6 +17,8 @@ void* xCalloc(size_t nmemb, size_t size);
 
 void* xRealloc(void* ptr, size_t size);
 
+#define xSnprintf(fmt, len, ...) do { int _l=len; int _n=snprintf(fmt, _l, __VA_ARGS__); if (!(_n > -1 && _n < _l)) { curs_set(1); endwin(); err(1, NULL); } } while(0)
+
 #undef xStrdup
 #undef xStrdup_
 #ifdef NDEBUG