From 4a8eb8d13e4cbeaaa72312159b65d2a51876ec32 Mon Sep 17 00:00:00 2001
From: Harald Welte <laforge@gnumonks.org>
Date: Tue, 11 Mar 2014 10:32:12 +0100
Subject: vty/buffer.c: Work on systems that don't implement writev()

.. such as Nuttx.
---
 src/vty/buffer.c | 31 ++++++++++++++++++++++++++++++-
 1 file changed, 30 insertions(+), 1 deletion(-)

diff --git a/src/vty/buffer.c b/src/vty/buffer.c
index e0abe813..51140f96 100644
--- a/src/vty/buffer.c
+++ b/src/vty/buffer.c
@@ -26,12 +26,37 @@
 #include <string.h>
 #include <errno.h>
 #include <stddef.h>
-#include <sys/uio.h>
 
 #include <osmocom/core/talloc.h>
 #include <osmocom/vty/buffer.h>
 #include <osmocom/vty/vty.h>
 
+#ifdef HAVE_SYS_UIO_H
+#include <sys/uio.h>
+#else
+/* some platforms (e.g. Nuttx) don't have writev(), so we reimplement it
+ * here */
+struct iovec
+{
+	void *iov_base;
+	size_t iov_len;
+};
+static ssize_t writev(int fd, const struct iovec *iovec, int count)
+{
+	int i, rc;
+	ssize_t written = 0;
+
+	for (i = 0; i < count; i++) {
+		rc = write(fd, iovec[i].iov_base, iovec[i].iov_len);
+		if (rc <= 0)
+			return rc;
+		written += rc;
+	}
+
+	return written;
+}
+#endif
+
 /* Buffer master. */
 struct buffer {
 	/* Data list. */
@@ -76,7 +101,11 @@ struct buffer *buffer_new(void *ctx, size_t size)
 	else {
 		static size_t default_size;
 		if (!default_size) {
+#ifdef HAVE_SYSCONF
 			long pgsz = sysconf(_SC_PAGESIZE);
+#else
+			long pgsz = 4096;
+#endif
 			default_size =
 			    ((((BUFFER_SIZE_DEFAULT - 1) / pgsz) + 1) * pgsz);
 		}
-- 
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