Re: [PATCH] xenalyze: correct symbol name length fscanf() specifier

[Alejandro Vallejo <alejandro.garciavallejo@xxxxxxx>]

On Mon Jul 28, 2025 at 5:52 PM CEST, Jan Beulich wrote:
> SYMBOL_NAME_SIZE is 124, not 128. Use the symbolic name there as well,
> to avoid any disconnect.
>
> While there correct indentation on the following line as well.
>
> Coverity ID: 1659391
> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
> ---
> There's no useful Fixes: tag; the code was imported from HG this way
> about 10 years ago.
>
> --- a/tools/xentrace/xenalyze.c
> +++ b/tools/xentrace/xenalyze.c
> @@ -321,11 +321,10 @@ void parse_symbol_file(char *fn) {
>              (*p)->next=NULL;
>          }
>  
> -        /* FIXME -- use SYMBOL_NAME_SIZE */
>          /* FIXME -- use regexp.  This won't work for symbols with spaces 
> (yes they exist) */
>          (*p)->symbols[(*p)->count].addr = 0xDEADBEEF;
> -        if ( fscanf(symbol_file, "%llx %128s",
> -               &(*p)->symbols[(*p)->count].addr,
> +        if ( fscanf(symbol_file, "%llx %" STR(SYMBOL_NAME_SIZE) "s",

nit: A comment at the #define stating it's used this way would prevent future
"oops" situations when/if someone tries to do (e.g) "#define SYMBOL_NAME_SIZE (1
<< 4)"

Though arguably that would cause a compile-time error anyway (except perhaps
an octal literal?), so meh. With or without the adjustment:

  Reviewed-by: Alejandro Vallejo <alejandro.garciavallejo@xxxxxxx>

> +                    &(*p)->symbols[(*p)->count].addr,
>                      (*p)->symbols[(*p)->count].name) == 0 )
>              break;
>