Add reallocarray(3).

libc/Makefile

@@ -179,6 +179,7 @@ stdlib/mbstowcs.o \
 stdlib/mbtowc.o \
 stdlib/qsort.o \
 stdlib/qsort_r.o \
+stdlib/reallocarray.o \
 stdlib/realloc.o \
 stdlib/strtod.o \
 stdlib/strtof.o \

libc/include/stdlib.h

@@ -170,6 +170,7 @@ int unlockpt(int);
 uint32_t arc4random(void);
 void arc4random_buf(void*, size_t);
 uint32_t arc4random_uniform(uint32_t);
+void* reallocarray(void*, size_t, size_t);
 #endif
 
 __END_DECLS

libc/stdlib/reallocarray.cpp

@@ -0,0 +1,34 @@
+/*******************************************************************************
+
+    Copyright(C) Jonas 'Sortie' Termansen 2014.
+
+    This file is part of the Sortix C Library.
+
+    The Sortix C Library is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Lesser General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or (at your
+    option) any later version.
+
+    The Sortix C Library is distributed in the hope that it will be useful, but
+    WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+    or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
+    License for more details.
+
+    You should have received a copy of the GNU Lesser General Public License
+    along with the Sortix C Library. If not, see <http://www.gnu.org/licenses/>.
+
+    stdlib/reallocarray.cpp
+    Reallocates a chunk of memory from the dynamic memory heap.
+
+*******************************************************************************/
+
+#include <errno.h>
+#include <stdint.h>
+#include <stdlib.h>
+
+extern "C" void* reallocarray(void* ptr, size_t nmemb, size_t size)
+{
+	if ( size && nmemb && SIZE_MAX / size < nmemb )
+		return errno = ENOMEM, (void*) NULL;
+	return realloc(ptr, nmemb * size);
+}