1 files changed, 87 insertions, 0 deletions
diff --git a/cbtcommon/sio.c b/cbtcommon/sio.c
new file mode 100644
index 0000000..a9faf81
--- /dev/null
+++ b/cbtcommon/sio.c
@@ -0,0 +1,87 @@
+/*
+ * Copyright 2001, 2002, 2003 David Mansfield and Cobite, Inc.
+ * See COPYING file for license information 
+ */
+
+#include <stdio.h>
+
+#ifdef WIN32
+#include <io.h>
+#else
+#include <unistd.h>
+#endif
+
+#include <errno.h>
+
+#include "sio.h"
+#include "rcsid.h"
+
+RCSID("$Id: sio.c,v 1.5 2001/10/25 18:36:11 adam Exp $");
+
+ssize_t readn(int fd, void *buf, size_t len)
+{
+
+  int nleft,nread;
+
+  nleft = len;
+
+  while (nleft > 0)
+  {
+    nread = read(fd,buf,nleft);
+
+    /* there is an issue which EINTR which could leave us a bit haywire
+     * if we get a signal after having read some bytes. special handling
+     * N.B: we *do* return EINTR if no data has been read yet (thanks Karl)
+     */
+    if (nread < 0)
+    {
+      if (errno == EINTR && nleft != (int)len)
+        continue;
+      else
+	    return (nread);
+    }
+    else if (nread == 0)
+      break;
+
+    nleft -= nread;
+
+    if (nleft)
+      buf = ((char *)buf) + nread;
+  }
+  return (len - nleft);
+}
+
+ssize_t writen(int fd, const void *buf, size_t len)
+{
+  
+  int nleft, nwritten;
+
+  nleft = len;
+
+  while (nleft > 0)
+  {
+    nwritten = write(fd,buf,nleft);
+
+    /* there is an issue with EINTR if we have already written
+       a few bytes! return if we have not written any yet */
+    if (nwritten < 0 && errno == EINTR)
+    {
+      if (nleft == (int)len)
+	return nwritten;
+      
+      continue;
+    }
+    
+
+    if (nwritten <= 0)
+      return nwritten;
+
+    nleft -= nwritten;
+
+    if (nleft)
+      buf = ((char *)buf) + nwritten;
+  }
+  
+  return (len - nleft);
+}
+