Adding src/transport.c for the SECSH transport layer read/write in a non-

blocking way. The channel code is now responsible for enabling/disabling
blocking status and to work with it.

I've also modified indenting and fixed compiler warnings at places, and
added a bunch of new examples in example/simple that I've used to verify that
the code still runs like before.

libssh2_channel_{read|write}nb_ex() and libssh2_sftp_{read|write}nb() are the
four new functions that supposedly work non-blocking.

example/simple/sftp.c

@@ -1,5 +1,5 @@
 /*
- * $Id: sftp.c,v 1.1 2007/01/24 14:15:36 bagder Exp $
+ * $Id: sftp.c,v 1.2 2007/02/02 16:21:20 bagder Exp $
  *
  * Sample showing how to do SFTP transfers.
  */
@@ -109,6 +109,7 @@ int main(int argc, char *argv[])
 		}
 	}
 
+	fprintf(stderr, "libssh2_sftp_init()!\n");
 	sftp_session = libssh2_sftp_init(session);
 
 	if (!sftp_session) {
@@ -116,6 +117,7 @@ int main(int argc, char *argv[])
 		goto shutdown;
 	}
 
+	fprintf(stderr, "libssh2_sftp_open()!\n");
 	/* Request a file via SFTP */
 	sftp_handle =
 		libssh2_sftp_open(sftp_session, sftppath, LIBSSH2_FXF_READ, 0);
@@ -129,6 +131,7 @@ int main(int argc, char *argv[])
 		char mem[512];
 
 		/* loop until we fail */
+		fprintf(stderr, "libssh2_sftp_read()!\n");
 		rc = libssh2_sftp_read(sftp_handle, mem, sizeof(mem));
 		if(rc > 0) {
 			write(2, mem, rc);