xmalloc: Add and use xcalloc

Add a wrapper for calloc which checks for integer overflows in the
calculation of the size to allocate.

Use xcalloc to allocate an array of objects instead of calculating the
size ourselves, which might cause an integer overflow.

Signed-off-by: Tobias Klauser <tklauser@distanz.ch>

1 files changed, 1 insertions, 0 deletions

diff --git a/xmalloc.h b/xmalloc.h
index 952b827..2ad0372 100644
--- a/xmalloc.h
+++ b/xmalloc.h
@@ -7,6 +7,7 @@
 #include "die.h"
 
 extern void *xmalloc(size_t size) __hidden;
+extern void *xcalloc(size_t nmemb, size_t size) __hidden;
 extern void *xzmalloc(size_t size) __hidden;
 extern void *xmallocz(size_t size) __hidden;
 extern void *xmalloc_aligned(size_t size, size_t alignment) __hidden;