add compat for endian (now required by imsg)

configure

@@ -244,6 +244,22 @@ if ! runtest wait_any WAIT_ANY; then
 	CFLAGS="${CFLAGS} -DWAIT_ANY=-1"
 fi
 
+HAVE_ENDIAN_H=0
+HAVE_SYS_ENDIAN_H=0
+HAVE_MACHINE_ENDIAN=0
+
+runtest endian_h	ENDIAN_H	|| \
+runtest sys_endian_h	SYS_ENDIAN_H	|| \
+runtest machine_endian	MACHINE_ENDIAN	|| true
+
+if [ ${HAVE_ENDIAN_H} -eq 0 -a \
+     ${HAVE_SYS_ENDIAN_H} -eq 0 -a \
+     ${HAVE_MACHINE_ENDIAN} -eq 0 ]; then
+	echo "FATAL: no endian header found" 1>&2
+	echo "FATAL: no endian header found" 1>&3
+	exit 1
+fi
+
 runtest err		ERR		|| true
 runtest explicit_bzero	EXPLICIT_BZERO	|| true
 runtest freezero	FREEZERO	|| true
@@ -349,6 +365,20 @@ cat <<__HEREDOC__
 
 __HEREDOC__
 
+if [ ${HAVE_ENDIAN_H} -eq 1 ]; then
+	echo "#include <endian.h>"
+elif [ ${HAVE_SYS_ENDIAN_H} -eq 1 ]; then
+	echo "#include <sys/endian.h>"
+elif [ ${HAVE_MACHINE_ENDIAN} -eq 1 ]; then
+	cat <<__HEREDOC__
+#include <machine/endian.h>
+#include <libkern/OSByteOrder.h>
+#define htobe16(x) OSSwapHostToBigInt16(x)
+#define htobe32(x) OSSwapHostToBigInt32(x)
+#define htobe64(x) OSSwapHostToBigInt64(x)
+__HEREDOC__
+fi
+
 [ ${HAVE_EXPLICIT_BZERO} -eq 0 -o \
   ${HAVE_FREEZERO} -eq 0 -o \
   ${HAVE_REALLOCARRAY} -eq 0 -o \

have/endian_h.c

@@ -0,0 +1,27 @@
+/*
+ * Copyright (c) 2023 Omar Polo <op@omarpolo.com>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <endian.h>
+#include <stdint.h>
+
+int
+main(void)
+{
+	uint16_t	x;
+
+	x = 42;
+	return (htobe16(x));
+}

have/machine_endian.c

@@ -0,0 +1,28 @@
+/*
+ * Copyright (c) 2023 Omar Polo <op@omarpolo.com>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <machine/endian.h>
+#include <libkern/OSByteOrder.h>
+#include <stdint.h>
+
+int
+main(void)
+{
+	uint16_t	x;
+
+	x = 42;
+	return (OSSwapHostToBigInt16(x));
+}

have/sys_endian_h.c

@@ -0,0 +1,27 @@
+/*
+ * Copyright (c) 2023 Omar Polo <op@omarpolo.com>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <sys/endian.h>
+#include <stdint.h>
+
+int
+main(void)
+{
+	uint16_t	x;
+
+	x = 42;
+	return (htobe16(x));
+}