Cleanup: consolidate swrite

swrite.cpp

@@ -0,0 +1,23 @@
+#include <unistd.h>
+#include <string.h>
+#include <stdio.h>
+
+#include "swrite.hpp"
+
+int swrite( int fd, const char *str, ssize_t len )
+{
+  ssize_t total_bytes_written = 0;
+  ssize_t bytes_to_write = ( len >= 0 ) ? len : strlen( str );
+  while ( total_bytes_written < bytes_to_write ) {
+    ssize_t bytes_written = write( fd, str + total_bytes_written,
+				   bytes_to_write - total_bytes_written );
+    if ( bytes_written <= 0 ) {
+      perror( "write" );
+      return -1;
+    } else {
+      total_bytes_written += bytes_written;
+    }
+  }
+
+  return 0;
+}