add recallocarray replacement and dependency

recallocarray() needs getpagesize() so add a tiny replacement for that.

1 files changed, 23 insertions, 0 deletions

diff --git a/openbsd-compat/bsd-getpagesize.c b/openbsd-compat/bsd-getpagesize.c
new file mode 100644
index 00000000..9daddfbd
--- /dev/null
+++ b/openbsd-compat/bsd-getpagesize.c
@@ -0,0 +1,23 @@
+/* Placed in the public domain */
+
+#ifndef HAVE_GETPAGESIZE
+
+#include <unistd.h>
+#include <limits.h>
+
+int
+getpagesize(void)
+{
+#if defined(HAVE_SYSCONF) && defined(_SC_PAGESIZE)
+	long r = sysconf(_SC_PAGESIZE);
+	if (r > 0 && r < INT_MAX)
+		return (int)r;
+#endif
+	/*
+	 * This is at the lower end of common values and appropriate for
+	 * our current use of getpagesize() in recallocarray().
+	 */
+	return 4096;
+}
+
+#endif /* HAVE_GETPAGESIZE */