pw: fix building for iOS, completely untested

1 files changed, 11 insertions, 0 deletions

diff --git a/pw/reallocarray.c b/pw/reallocarray.c
new file mode 100644
index 0000000..7310133
--- /dev/null
+++ b/pw/reallocarray.c
@@ -0,0 +1,11 @@
+#include "reallocarray.h"
+
+#define MUL_NO_OVERFLOW ((size_t)1 << (sizeof(size_t) * 4))
+void *reallocarray(void *optr, size_t nmemb, size_t size) {
+    if ((nmemb >= MUL_NO_OVERFLOW || size >= MUL_NO_OVERFLOW) &&
+        nmemb > 0 && SIZE_MAX / nmemb < size) {
+        errno = ENOMEM;
+        return NULL;
+    }
+    return realloc(optr, size * nmemb);
+}