linux-kernel - Re: [PATCHv3] drivers: isdn: get rid of custom strtoul()

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Date:	Sun, 07 Mar 2010 00:54:48 +0100
From:	Tilman Schmidt <tilman@...p.cc>
To:	Andy Shevchenko <andy.shevchenko@...il.com>
CC:	linux-kernel@...r.kernel.org, Hansjoerg Lipp <hjlipp@....de>
Subject: Re: [PATCHv3] drivers: isdn: get rid of custom strtoul()

Am 26.02.2010 08:26 schrieb Andy Shevchenko:
> There were two methods isdn_gethex() and isdn_getnum() which are custom
> implementations of strtoul(). Get rid of them in regard to
> strict_strtoul() kernel's function.
> 
> The patch should be applied on top of "[PATCH 3/4] gigaset: reduce syslog
> clutter" [1]
> 
> [1] http://patchwork.kernel.org/patch/81327/
> 
> Signed-off-by: Andy Shevchenko <andy.shevchenko@...il.com>
> Cc: Hansjoerg Lipp <hjlipp@....de>
> Cc: Tilman Schmidt <tilman@...p.cc>

Acked-by: Tilman Schmidt <tilman@...p.cc>

Thanks,
Tilman

> ---
>  drivers/isdn/gigaset/ev-layer.c |   82 +++++++++-----------------------------
>  1 files changed, 20 insertions(+), 62 deletions(-)
> 
> diff --git a/drivers/isdn/gigaset/ev-layer.c b/drivers/isdn/gigaset/ev-layer.c
> index c8f89b7..b1a334b 100644
> --- a/drivers/isdn/gigaset/ev-layer.c
> +++ b/drivers/isdn/gigaset/ev-layer.c
> @@ -420,64 +420,18 @@ static const struct zsau_resp_t {
>  	{NULL,				ZSAU_UNKNOWN}
>  };
>  
> -/*
> - * Get integer from char-pointer
> - */
> -static int isdn_getnum(char *p)
> -{
> -	int v = -1;
> -
> -	gig_dbg(DEBUG_EVENT, "string: %s", p);
> -
> -	while (*p >= '0' && *p <= '9')
> -		v = ((v < 0) ? 0 : (v * 10)) + (int) ((*p++) - '0');
> -	if (*p)
> -		v = -1; /* invalid Character */
> -	return v;
> -}
> -
> -/*
> - * Get integer from char-pointer
> - */
> -static int isdn_gethex(char *p)
> -{
> -	int v = 0;
> -	int c;
> -
> -	gig_dbg(DEBUG_EVENT, "string: %s", p);
> -
> -	if (!*p)
> -		return -1;
> -
> -	do {
> -		if (v > (INT_MAX - 15) / 16)
> -			return -1;
> -		c = *p;
> -		if (c >= '0' && c <= '9')
> -			c -= '0';
> -		else if (c >= 'a' && c <= 'f')
> -			c -= 'a' - 10;
> -		else if (c >= 'A' && c <= 'F')
> -			c -= 'A' - 10;
> -		else
> -			return -1;
> -		v = v * 16 + c;
> -	} while (*++p);
> -
> -	return v;
> -}
> -
>  /* retrieve CID from parsed response
>   * returns 0 if no CID, -1 if invalid CID, or CID value 1..65535
>   */
>  static int cid_of_response(char *s)
>  {
> -	int cid;
> +	unsigned long cid;
> +	int rc;
>  
>  	if (s[-1] != ';')
>  		return 0;	/* no CID separator */
> -	cid = isdn_getnum(s);
> -	if (cid < 0)
> +	rc = strict_strtoul(s, 10, &cid);
> +	if (rc)
>  		return 0;	/* CID not numeric */
>  	if (cid < 1 || cid > 65535)
>  		return -1;	/* CID out of range */
> @@ -647,24 +601,28 @@ void gigaset_handle_modem_response(struct cardstate *cs)
>  		case RT_ZCAU:
>  			event->parameter = -1;
>  			if (curarg + 1 < params) {
> -				i = isdn_gethex(argv[curarg]);
> -				j = isdn_gethex(argv[curarg + 1]);
> -				if (i >= 0 && i < 256 && j >= 0 && j < 256)
> -					event->parameter = (unsigned) i << 8
> -							   | j;
> -				curarg += 2;
> +				unsigned long hi, lo;
> +				int rh, rl;
> +
> +				rh = strict_strtoul(argv[curarg++], 16, &hi);
> +				rl = strict_strtoul(argv[curarg++], 16, &lo);
> +
> +				if (rh == 0 && hi < 256 && rl == 0 && lo < 256)
> +					event->parameter = (hi << 8) | lo;
>  			} else
>  				curarg = params - 1;
>  			break;
>  		case RT_NUMBER:
>  		case RT_HEX:
>  			if (curarg < params) {
> -				if (param_type == RT_HEX)
> -					event->parameter =
> -						isdn_gethex(argv[curarg]);
> -				else
> -					event->parameter =
> -						isdn_getnum(argv[curarg]);
> +				int base = (param_type == RT_HEX) ? 16 : 10;
> +				unsigned long res;
> +				int rc;
> +
> +				rc = strict_strtoul(argv[curarg], base, &res);
> +				if (rc == 0)
> +					event->parameter = res;
> +
>  				++curarg;
>  			} else
>  				event->parameter = -1;

-- 
Tilman Schmidt                    E-Mail: tilman@...p.cc
Bonn, Germany
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