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, 1 deletions

diff --git a/XAlloc.c b/XAlloc.c
index 5f2e9a4b..fbc642cc 100644
--- a/XAlloc.c
+++ b/XAlloc.c
@@ -5,11 +5,11 @@
 #ifndef _GNU_SOURCE
 #define _GNU_SOURCE
 #endif
-#include <err.h>
 #include <stdlib.h>
 #include <string.h>
 
 /*{
+#include <err.h>
 #include <assert.h>
 #include <stdlib.h>
 }*/
@@ -44,6 +44,8 @@ void* xRealloc(void* ptr, size_t size) {
    return data;
 }
 
+#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