[PATCH 1/3] fs/parseopt: Add parseopt_llu_suffix

[Sascha Hauer]

On Thu, Feb 01, 2018 at 11:37:15AM +0100, Philipp Zabel wrote:
> Add an option parser using strtoull_suffix that can be used to
> parse a loop mount offset option.
> 
> Signed-off-by: Philipp Zabel <p.zabel at pengutronix.de>
> ---
>  include/parseopt.h |  2 ++
>  lib/parseopt.c     | 30 ++++++++++++++++++++++++++++++
>  2 files changed, 32 insertions(+)

Applied, thanks

Sascha

> 
> diff --git a/include/parseopt.h b/include/parseopt.h
> index 1f9763f8c9..273a371ac3 100644
> --- a/include/parseopt.h
> +++ b/include/parseopt.h
> @@ -1,5 +1,7 @@
>  #ifndef __PARSEOPT_H__
>  #define __PARSEOPT_H__
> +void parseopt_llu_suffix(const char *options, const char *opt,
> +			 unsigned long long *val);
>  
>  void parseopt_b(const char *options, const char *opt, bool *val);
>  void parseopt_hu(const char *options, const char *opt, unsigned short *val);
> diff --git a/lib/parseopt.c b/lib/parseopt.c
> index 8211733e3b..70983066d9 100644
> --- a/lib/parseopt.c
> +++ b/lib/parseopt.c
> @@ -122,3 +122,33 @@ again:
>  
>  	*val = xstrndup(parsed, endp - parsed);
>  }
> +
> +void parseopt_llu_suffix(const char *options, const char *opt,
> +			 unsigned long long *val)
> +{
> +	const char *start;
> +	size_t optlen = strlen(opt);
> +	unsigned long long v;
> +	char *endp;
> +
> +again:
> +	start = strstr(options, opt);
> +
> +	if (!start)
> +		return;
> +
> +	if (start > options && start[-1] != ',') {
> +		options = start;
> +		goto again;
> +	}
> +
> +	if (start[optlen] != '=') {
> +		options = start;
> +		goto again;
> +	}
> +
> +	v = strtoull_suffix(start + optlen + 1, &endp, 0);
> +
> +	if (*endp == ',' || *endp == '\0')
> +		*val = v;
> +}
> -- 
> 2.15.1
> 
> 
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