WIP

1 files changed, 93 insertions, 0 deletions

diff --git a/c_src/net_read_write.c b/c_src/net_read_write.c
new file mode 100644
index 0000000..f8f14f0
--- /dev/null
+++ b/c_src/net_read_write.c
@@ -0,0 +1,93 @@
+/*
+ * Copyright (c) 1995, 1996, 1997, 1998 Kungliga Tekniska Högskolan
+ * (Royal Institute of Technology, Stockholm, Sweden).
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * 3. Neither the name of the Institute nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/types.h>
+#include <sys/uio.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+
+#include "net_read_write.h"
+
+/*
+ * Like read but never return partial data.
+ */
+
+ssize_t
+net_read (int fd, void *buf, size_t nbytes)
+{
+    char *cbuf = (char *)buf;
+    ssize_t count;
+    size_t rem = nbytes;
+
+    while (rem > 0) {
+	count = read (fd, cbuf, rem);
+	if (count < 0) {
+	    if (errno == EINTR)
+		continue;
+	    else
+		return count;
+	} else if (count == 0) {
+	    return count;
+	}
+	cbuf += (size_t) count;
+	rem -= (size_t) count;
+    }
+    return (ssize_t)nbytes;
+}
+
+/*
+ * Like write but never return partial data.
+ */
+
+ssize_t
+net_write (int fd, const void *buf, size_t nbytes)
+{
+    const char *cbuf = (const char *)buf;
+    ssize_t count;
+    size_t rem = nbytes;
+
+    while (rem > 0) {
+	count = write (fd, cbuf, rem);
+	if (count < 0) {
+	    if (errno == EINTR)
+		continue;
+	    else
+		return count;
+	}
+	cbuf += (size_t)count;
+	rem -= (size_t)count;
+    }
+    return (ssize_t)nbytes;
+}