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-rw-r--r--c_src/net_read_write.c93
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diff --git a/c_src/net_read_write.c b/c_src/net_read_write.c
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+/*
+ * 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;
+}