Re: [PATCH 13/13] gdb/tracepoint: remove uses of sprintf

[Andrew Burgess <aburgess@redhat.com>]

Simon Marchi <simon.marchi@efficios.com> writes:

> When building on macOS, I get some:
>
>     /Users/smarchi/src/binutils-gdb/gdb/tracepoint.c:1196:4: error: 'sprintf' is deprecated: This function is provided for compatibility reasons only.  Due to security concerns inherent in the design of sprintf(3), it is highly recommended that you use snprintf(3) instead. [-Werror,-Wdeprecated-declarations]
>      1196 |           sprintf (end, "M-1,%s,%lX", phex_nz (m_memranges[i].start, 0),
>           |           ^
>
> Replace them with xsnprintf.

LGTM.

Approved-By: Andrew Burgess <aburgess@redhat.com>

Thanks,
Andrew

>
> Change-Id: Id3ec76c47e5c0091fa3a028e36063b2115378e7e
> ---
>  gdb/tracepoint.c | 25 +++++++++++++++++--------
>  1 file changed, 17 insertions(+), 8 deletions(-)
>
> diff --git a/gdb/tracepoint.c b/gdb/tracepoint.c
> index 798bb9a552d8..932a8f557e44 100644
> --- a/gdb/tracepoint.c
> +++ b/gdb/tracepoint.c
> @@ -1164,6 +1164,9 @@ collection_list::stringify ()
>      gdb_printf ("\n");
>    if (!m_memranges.empty () && info_verbose)
>      gdb_printf ("Collecting memranges: \n");
> +
> +  char *buf_end = temp_buf.data () + temp_buf.size ();
> +
>    for (i = 0, count = 0, end = temp_buf.data ();
>         i < m_memranges.size (); i++)
>      {
> @@ -1193,11 +1196,12 @@ collection_list::stringify ()
>  	   "FFFFFFFF" (or more, depending on sizeof (unsigned)).
>  	   Special-case it.  */
>  	if (m_memranges[i].type == memrange_absolute)
> -	  sprintf (end, "M-1,%s,%lX", phex_nz (m_memranges[i].start, 0),
> -		   (long) length);
> +	  xsnprintf (end, buf_end - end, "M-1,%s,%lX",
> +		     phex_nz (m_memranges[i].start, 0), (long) length);
>  	else
> -	  sprintf (end, "M%X,%s,%lX", m_memranges[i].type,
> -		   phex_nz (m_memranges[i].start, 0), (long) length);
> +	  xsnprintf (end, buf_end - end, "M%X,%s,%lX",
> +		     m_memranges[i].type, phex_nz (m_memranges[i].start, 0),
> +		     (long) length);
>        }
>  
>        count += strlen (end);
> @@ -1213,7 +1217,9 @@ collection_list::stringify ()
>  	  count = 0;
>  	  end = temp_buf.data ();
>  	}
> -      sprintf (end, "X%08X,", (int) m_aexprs[i]->buf.size ());
> +
> +      xsnprintf (end, buf_end - end, "X%08X,",
> +		 (int) m_aexprs[i]->buf.size ());
>        end += 10;		/* 'X' + 8 hex digits + ',' */
>        count += 10;
>  
> @@ -2816,11 +2822,14 @@ encode_source_string (int tpnum, ULONGEST addr,
>  {
>    if (80 + strlen (srctype) > buf_size)
>      error (_("Buffer too small for source encoding"));
> -  sprintf (buf, "%x:%s:%s:%x:%x:",
> -	   tpnum, phex_nz (addr),
> -	   srctype, 0, (int) strlen (src));
> +
> +  xsnprintf (buf, buf_size, "%x:%s:%s:%x:%x:",
> +	     tpnum, phex_nz (addr),
> +	     srctype, 0, (int) strlen (src));
> +
>    if (strlen (buf) + strlen (src) * 2 >= buf_size)
>      error (_("Source string too long for buffer"));
> +
>    bin2hex ((gdb_byte *) src, buf + strlen (buf), strlen (src));
>    return -1;
>  }
> -- 
> 2.55.0