Re: [PATCH v2 10/10] app/test-dma-perf: fix parsing of DMA address

[Bruce Richardson <bruce.richardson@intel.com>]

On Thu, Nov 14, 2024 at 11:25:08AM -0800, Stephen Hemminger wrote:
> There was useless loop when looking at the DMA address.
> It looks like it was meant to skip whitespace before
> calling strtok.
> 
> Good time to replace strtok with strtok_r as well.
> 
> Link: https://pvs-studio.com/en/blog/posts/cpp/1179/
> 
> Fixes: 623dc9364dc6 ("app/dma-perf: introduce DMA performance test")
> Cc: cheng1.jiang@intel.com
> Cc: stable@dpdk.org
> 
> Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>

One comment inline below. With that fixed:

Acked-by: Bruce Richardson <bruce.richardson@intel.com>

> ---
>  app/test-dma-perf/main.c | 12 ++++++------
>  1 file changed, 6 insertions(+), 6 deletions(-)
> 
> diff --git a/app/test-dma-perf/main.c b/app/test-dma-perf/main.c
> index 18219918cc..dccb0a3541 100644
> --- a/app/test-dma-perf/main.c
> +++ b/app/test-dma-perf/main.c
> @@ -217,27 +217,27 @@ parse_lcore_dma(struct test_configure *test_case, const char *value)
>  	struct lcore_dma_map_t *lcore_dma_map;
>  	char *input, *addrs;
>  	char *ptrs[2];
> -	char *start, *end, *substr;
> +	char *start, *end, *substr, *saveptr;
>  	uint16_t lcore_id;
>  	int ret = 0;
>  
>  	if (test_case == NULL || value == NULL)
>  		return -1;
>  
> -	input = strndup(value, strlen(value) + 1);
> +	input = strdup(value);
>  	if (input == NULL)
>  		return -1;
> -	addrs = input;
>  
> -	while (*addrs == '\0')
> -		addrs++;
> +	addrs = input;
> +	while (isspace(*addrs))
> +		++addrs;
>  	if (*addrs == '\0') {
>  		fprintf(stderr, "No input DMA addresses\n");
>  		ret = -1;
>  		goto out;
>  	}
>  
> -	substr = strtok(addrs, ",");
> +	substr = strtok_r(addrs, ",", &saveptr);

Don't need to use strtok here at all. Just use strchr, and then no need for
a new temporary variable.

>  	if (substr == NULL) {
>  		fprintf(stderr, "No input DMA address\n");
>  		ret = -1;
> -- 
> 2.45.2
>