linux-kernel - Re: [PATCH 05/13] perf tools: Introduce strtobool() to string.c

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Date:	Mon, 16 Nov 2015 11:17:18 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Wang Nan <wangnan0@...wei.com>
Cc:	masami.hiramatsu.pt@...achi.com, ast@...nel.org,
	lizefan@...wei.com, pi3orama@....com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 05/13] perf tools: Introduce strtobool() to string.c

Em Mon, Nov 16, 2015 at 12:10:07PM +0000, Wang Nan escreveu:
> This patch clones strtobool() from kernel's string.c to perf's string.c,
> then add the function entry to tools/perf/util/include/linux/string.h.
> 
> string.h in perf utils doesn't have #ifdef guard. This patch fixes it.
> 
> This is preparation for enforcing BPF program configuration, which
> would allow config string like 'inlines=yes'.

This is not perf specific at all, we're trying to move stuff out of
tools/perf/ so that it becomes generally usable by other tools/ living
code, not just perf.

I'll move it to where I think it should be and post as a reply to this
message.

- Arnaldo
 
> Signed-off-by: Wang Nan <wangnan0@...wei.com>
> Cc: Alexei Starovoitov <ast@...nel.org>
> Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
> Cc: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
> Cc: Zefan Li <lizefan@...wei.com>
> Cc: pi3orama@....com
> ---
>  tools/perf/util/include/linux/string.h |  5 +++++
>  tools/perf/util/string.c               | 28 ++++++++++++++++++++++++++++
>  2 files changed, 33 insertions(+)
> 
> diff --git a/tools/perf/util/include/linux/string.h b/tools/perf/util/include/linux/string.h
> index 6f19c54..2bb0057 100644
> --- a/tools/perf/util/include/linux/string.h
> +++ b/tools/perf/util/include/linux/string.h
> @@ -1,3 +1,8 @@
> +#ifndef PERF_LINUX_STRING_H_
> +#define PERF_LINUX_STRING_H_
>  #include <string.h>
>  
>  void *memdup(const void *src, size_t len);
> +
> +int strtobool(const char *s, bool *res);
> +#endif
> diff --git a/tools/perf/util/string.c b/tools/perf/util/string.c
> index fc8781d..c7fd44d 100644
> --- a/tools/perf/util/string.c
> +++ b/tools/perf/util/string.c
> @@ -396,3 +396,31 @@ out_err_overflow:
>  	free(expr);
>  	return NULL;
>  }
> +
> +/**
> + * strtobool - convert common user inputs into boolean values
> + * @s: input string
> + * @res: result
> + *
> + * This routine returns 0 iff the first character is one of 'Yy1Nn0'.
> + * Otherwise it will return -EINVAL.  Value pointed to by res is
> + * updated upon finding a match.
> + */
> +int strtobool(const char *s, bool *res)
> +{
> +	switch (s[0]) {
> +	case 'y':
> +	case 'Y':
> +	case '1':
> +		*res = true;
> +		break;
> +	case 'n':
> +	case 'N':
> +	case '0':
> +		*res = false;
> +		break;
> +	default:
> +		return -EINVAL;
> +	}
> +	return 0;
> +}
> -- 
> 1.8.3.4
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