[prompt] Replace shell_banner() with a generic prompt() function

Signed-off-by: Michael Brown <mcb30@ipxe.org>

src/core/main.c

 #include <ipxe/init.h>
 #include <ipxe/features.h>
 #include <ipxe/shell.h>
-#include <ipxe/shell_banner.h>
 #include <ipxe/image.h>
+#include <ipxe/keys.h>
+#include <usr/prompt.h>
 #include <usr/autoboot.h>
 #include <config/general.h>
 
 #define BOLD	"\033[1m"
 #define CYAN	"\033[36m"
 
+/**
+ * Prompt for shell entry
+ *
+ * @ret	enter_shell		User wants to enter shell
+ */
+static int shell_banner ( void ) {
+
+	/* Skip prompt if timeout is zero */
+	if ( BANNER_TIMEOUT <= 0 )
+		return 0;
+
+	return ( prompt ( "\nPress Ctrl-B for the iPXE command line...",
+			  ( BANNER_TIMEOUT * 100 ), CTRL_B ) == 0 );
+}
+
 /**
  * Main entry point
  *

src/include/ipxe/errfile.h

 #define ERRFILE_gdbstub_cmd	      ( ERRFILE_OTHER | 0x001f0000 )
 #define ERRFILE_sanboot_cmd	      ( ERRFILE_OTHER | 0x00200000 )
 #define ERRFILE_bofm		      ( ERRFILE_OTHER | 0x00210000 )
+#define ERRFILE_prompt		      ( ERRFILE_OTHER | 0x00220000 )
 
 /** @} */
 

src/include/ipxe/shell_banner.h

-#ifndef _IPXE_SHELL_BANNER_H
-#define _IPXE_SHELL_BANNER_H
-
-/** @file
- *
- * Shell startup banner
- *
- */
-
-FILE_LICENCE ( GPL2_OR_LATER );
-
-extern int shell_banner ( void );
-
-#endif /* _IPXE_SHELL_BANNER_H */

src/include/usr/prompt.h

+#ifndef _USR_PROMPT_H
+#define _USR_PROMPT_H
+
+/** @file
+ *
+ * Prompt for keypress
+ *
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER );
+
+extern int prompt ( const char *text, unsigned int wait_ms, int key );
+
+#endif /* _USR_PROMPT_H */

src/hci/shell_banner.c → src/usr/prompt.c

 /*
- * Copyright (C) 2006 Michael Brown <mbrown@fensystems.co.uk>.
+ * Copyright (C) 2011 Michael Brown <mbrown@fensystems.co.uk>.
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License as
 
 FILE_LICENCE ( GPL2_OR_LATER );
 
-#include <stdio.h>
-#include <console.h>
-#include <config/general.h>
-#include <ipxe/keys.h>
-#include <ipxe/timer.h>
-#include <ipxe/shell_banner.h>
-
 /** @file
  *
- * Shell startup banner
+ * Prompt for keypress
  *
  */
 
+#include <errno.h>
+#include <stdio.h>
+#include <console.h>
+#include <ipxe/timer.h>
+#include <usr/prompt.h>
+
 /**
- * Print shell banner and prompt for shell entry
+ * Prompt for keypress
+ *
+ * @v text		Prompt string
+ * @v wait_ms		Time to wait, in milliseconds (0=indefinite)
+ * @v key		Key to wait for (0=any key)
+ * @ret rc		Return status code
  *
- * @ret	enter_shell		User wants to enter shell
+ * Returns success if the specified key was pressed within the
+ * specified timeout period.
  */
-int shell_banner ( void ) {
-	int key;
-
-	/* Skip prompt if timeout is zero */
-	if ( BANNER_TIMEOUT <= 0 )
-		return 0;
+int prompt ( const char *text, unsigned int wait_ms, int key ) {
+	int key_pressed;
 
 	/* Display prompt */
-	printf ( "\nPress Ctrl-B for the iPXE command line..." );
+	printf ( "%s", text );
 
 	/* Wait for key */
-	key = getkey ( ( BANNER_TIMEOUT * TICKS_PER_SEC ) / 10 );
+	key_pressed = getkey ( ( wait_ms * TICKS_PER_SEC ) / 1000 );
+
+	/* Clear the prompt line */
+	while ( *(text++) )
+		printf ( "\b \b" );
+
+	/* Check for timeout */
+	if ( key_pressed < 0 )
+		return -ETIMEDOUT;
 
-	/* Clear the "Press Ctrl-B" line */
-	printf ( "\r                                         \r" );
+	/* Check for correct key pressed */
+	if ( key && ( key_pressed != key ) )
+		return -ECANCELED;
 
-	return ( key == CTRL_B );
+	return 0;
 }