[U-Boot] [PATCH 1/3 v2] common: add possibility for readline_into_buffer timeout

[Stephan Linz <linz@li-pro.net>]

Hello Heiko,

it seems there is a problem with this patch for some architectures. On
Microblaze I run into linker errors:

common/libcommon.o: In function `cread_line':
u-boot-bref/common/main.c:717: undefined reference to `get_ticks'
u-boot-mbref/common/main.c:717: undefined reference to `get_tbclk'
u-boot-mbref/common/main.c:720: undefined reference to `get_ticks'

AFAICS some architectures lacking these symbols. What is the default
U-Boot design line here. Should we implement the missing symbols for
Microblaze or can you introduce a CONFIG_ option to disable this new
feature?

br,
Stephan

Am Dienstag, den 17.01.2012, 08:13 +0100 schrieb Heiko Schocher: 
> add possibility to add a timeout when reading a line
> into a buffer.
> 
> Signed-off-by: Heiko Schocher <hs@denx.de>
> Cc: Mike Frysinger <vapier@gentoo.org>
> 
> ---
> - changes for v2:
>   - add comments from Mike Frysinger <vapier@gentoo.org>:
>     - remove useless inner parens
>     - rework timeout handling in readline_into_buffer():
>       use endtick(), drop CONIG_SYS_HZ usage
> 
>  common/cmd_nvedit.c |    2 +-
>  common/main.c       |   20 ++++++++++++++++----
>  common/menu.c       |    3 ++-
>  include/common.h    |    3 ++-
>  4 files changed, 21 insertions(+), 7 deletions(-)
> 
> diff --git a/common/cmd_nvedit.c b/common/cmd_nvedit.c
> index 63afc82..20080dc 100644
> --- a/common/cmd_nvedit.c
> +++ b/common/cmd_nvedit.c
> @@ -502,7 +502,7 @@ int do_env_edit(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
>  	else
>  		buffer[0] = '\0';
>  
> -	readline_into_buffer("edit: ", buffer);
> +	readline_into_buffer("edit: ", buffer, 0);
>  
>  	return setenv(argv[1], buffer);
>  }
> diff --git a/common/main.c b/common/main.c
> index e96c95a..248744b 100644
> --- a/common/main.c
> +++ b/common/main.c
> @@ -685,7 +685,8 @@ static void cread_add_str(char *str, int strsize, int insert, unsigned long *num
>  	}
>  }
>  
> -static int cread_line(const char *const prompt, char *buf, unsigned int *len)
> +static int cread_line(const char *const prompt, char *buf, unsigned int *len,
> +		int timeout)
>  {
>  	unsigned long num = 0;
>  	unsigned long eol_num = 0;
> @@ -695,6 +696,7 @@ static int cread_line(const char *const prompt, char *buf, unsigned int *len)
>  	int esc_len = 0;
>  	char esc_save[8];
>  	int init_len = strlen(buf);
> +	int first = 1;
>  
>  	if (init_len)
>  		cread_add_str(buf, init_len, 1, &num, &eol_num, buf, *len);
> @@ -707,6 +709,16 @@ static int cread_line(const char *const prompt, char *buf, unsigned int *len)
>  			WATCHDOG_RESET();
>  		}
>  #endif
> +		if (first && timeout) {
> +			uint64_t etime = endtick(timeout);
> +
> +			while (!tstc()) {	/* while no incoming data */
> +				if (get_ticks() >= etime)
> +					return -2;	/* timed out */
> +				WATCHDOG_RESET();
> +			}
> +			first = 0;
> +		}
>  
>  		ichar = getcmd_getch();
>  
> @@ -922,11 +934,11 @@ int readline (const char *const prompt)
>  	 */
>  	console_buffer[0] = '\0';
>  
> -	return readline_into_buffer(prompt, console_buffer);
> +	return readline_into_buffer(prompt, console_buffer, 0);
>  }
>  
> 
> -int readline_into_buffer (const char *const prompt, char * buffer)
> +int readline_into_buffer(const char *const prompt, char *buffer, int timeout)
>  {
>  	char *p = buffer;
>  #ifdef CONFIG_CMDLINE_EDITING
> @@ -949,7 +961,7 @@ int readline_into_buffer (const char *const prompt, char * buffer)
>  		if (prompt)
>  			puts (prompt);
>  
> -		rc = cread_line(prompt, p, &len);
> +		rc = cread_line(prompt, p, &len, timeout);
>  		return rc < 0 ? rc : len;
>  
>  	} else {
> diff --git a/common/menu.c b/common/menu.c
> index 5e0817c..3b1e0d0 100644
> --- a/common/menu.c
> +++ b/common/menu.c
> @@ -222,7 +222,8 @@ static inline int menu_interactive_choice(struct menu *m, void **choice)
>  
>  		menu_display(m);
>  
> -		readret = readline_into_buffer("Enter choice: ", cbuf);
> +		readret = readline_into_buffer("Enter choice: ", cbuf,
> +				m->timeout);
>  
>  		if (readret >= 0) {
>  			choice_item = menu_item_by_key(m, cbuf);
> diff --git a/include/common.h b/include/common.h
> index 3df1def..7a9b3a2 100644
> --- a/include/common.h
> +++ b/include/common.h
> @@ -265,7 +265,8 @@ int	run_command	(const char *cmd, int flag);
>  int run_command2(const char *cmd, int flag);
>  #endif
>  int	readline	(const char *const prompt);
> -int	readline_into_buffer	(const char *const prompt, char * buffer);
> +int	readline_into_buffer(const char *const prompt, char *buffer,
> +			int timeout);
>  int	parse_line (char *, char *[]);
>  void	init_cmd_timeout(void);
>  void	reset_cmd_timeout(void);