[syslinux] [PATCH] cat.c32: check if filename exists

[Michael D. Setzer II]

On 3 May 2010 at 17:07, Gert Hulselmans wrote:

Date sent:      	Mon, 3 May 2010 17:07:43 -0700
From:           	"Gert Hulselmans" <gerth at zytor.com>
To:             	"For discussion of Syslinux and tftp-hpa" 
<syslinux at zytor.com>
Subject:        	[syslinux] [PATCH] cat.c32: check if filename exists
Send reply to:  	For discussion of Syslinux and tftp-hpa 
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> cat.c32: check if filename exists.
> 

Related to this. I have used a modified version of cat.c32 to display some 
text files from the isolinux menu. Just built a new image using the pre-40, 
and it locks when trying to display the file. I also have the original 
display.c32 and tried it from the command prompt, and it freezes as well.

Ctrl-Alt-Del doesn't restart it. Power off only.

Two other issues?
At the very beginning, it flashes a Hello, World from (hello.c) message?

The hdt when displaying the syslinux information seems to get a new line 
before the version, and throws of the screen.

The syslinux seems to work fine with the rest of the menus?

Tested on an AMD FX cpu system.

> Signed-off-by: Gert Hulselmans <gerth at zytor.com>
> ---
>  com32/samples/cat.c |    9 +++++++--
>  1 files changed, 7 insertions(+), 2 deletions(-)
> 
> diff --git a/com32/samples/cat.c b/com32/samples/cat.c
> index 16380b0..3930f74 100644
> --- a/com32/samples/cat.c
> +++ b/com32/samples/cat.c
> @@ -15,13 +15,18 @@ int main(int argc, char *argv[])
>  	printf("argv[%d] = %p = \"%s\"\n", i, argv[i], argv[i]);
> 
>      if (argc < 2) {
> -	fprintf(stderr, "Missing file name!\n");
> -	exit(1);
> +	fprintf(stderr, "Usage: cat.c32 filename\n");
> +	return 1;
>      }
> 
>      printf("File = %s\n", argv[1]);
> 
>      f = fopen(argv[1], "r");
> +    if (!f) {
> +	fprintf(stderr, "File name \"%s\" does not exist.\n", argv[1]);
> +	return 1;
> +    }
> +
>      while ((ch = getc(f)) != EOF)
>  	putchar(ch);
> 
> -- 
> 1.6.0.4
> 
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+----------------------------------------------------------+
  Michael D. Setzer II -  Computer Science Instructor      
  Guam Community College  Computer Center                  
  mailto:mikes at kuentos.guam.net                            
  mailto:msetzerii at gmail.com
  http://www.guam.net/home/mikes
  Guam - Where America's Day Begins                        
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