linux-kernel - Re: [PATCH] tools: perf: util: sort.c: Changed from using strncat to strlcat

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Message-ID: <20141013124401.GA5888@krava.redhat.com>
Date:	Mon, 13 Oct 2014 14:44:02 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Jiri Olsa <jolsa@...nel.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Don Zickus <dzickus@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] tools: perf: util: sort.c:  Changed from using strncat
 to strlcat

On Sun, Oct 12, 2014 at 10:40:35PM +0200, Rickard Strandqvist wrote:
> Changed from using strncat to strlcat to simplify the code
> 
> Signed-off-by: Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se>
> ---
>  tools/perf/util/sort.c |   12 ++++--------
>  1 file changed, 4 insertions(+), 8 deletions(-)
> 
> diff --git a/tools/perf/util/sort.c b/tools/perf/util/sort.c
> index 14e5a03..6e242f0 100644
> --- a/tools/perf/util/sort.c
> +++ b/tools/perf/util/sort.c
> @@ -759,8 +759,7 @@ static int hist_entry__snoop_snprintf(struct hist_entry *he, char *bf,
>  				    size_t size, unsigned int width)
>  {
>  	char out[64];
> -	size_t sz = sizeof(out) - 1; /* -1 for null termination */
> -	size_t i, l = 0;
> +	size_t i;
>  	u64 m = PERF_MEM_SNOOP_NA;
>  
>  	out[0] = '\0';
> @@ -771,12 +770,9 @@ static int hist_entry__snoop_snprintf(struct hist_entry *he, char *bf,
>  	for (i = 0; m && i < NUM_SNOOP_ACCESS; i++, m >>= 1) {
>  		if (!(m & 0x1))
>  			continue;
> -		if (l) {
> -			strcat(out, " or ");
> -			l += 4;
> -		}
> -		strncat(out, snoop_access[i], sz - l);
> -		l += strlen(snoop_access[i]);
> +		if (*out != '\0')
> +			strlcat(out, " or ", sizeof(out));
> +		strlcat(out, snoop_access[i], sizeof(out));

I've got compile error..

[jolsa@...va perf]$ make JOBS=1
  BUILD:   Doing 'make -j1' parallel build
  CC       perf.o
  CC       builtin-annotate.o
  CC       builtin-bench.o
  CC       bench/sched-messaging.o
  CC       bench/sched-pipe.o
  CC       util/sort.o
util/sort.c: In function ‘hist_entry__snoop_snprintf’:
util/sort.c:778:4: error: implicit declaration of function ‘strlcat’ [-Werror=implicit-function-declaration]
    strlcat(out, " or ", sizeof(out));
    ^
util/sort.c:778:4: error: nested extern declaration of ‘strlcat’ [-Werror=nested-externs]
cc1: all warnings being treated as errors
make[1]: *** [util/sort.o] Error 1
make: *** [all] Error 2

jirka
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