lkml.org 
[lkml]   [2006]   [May]   [16]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
From
SubjectRe: [RFC] [Patch 2/8] statistics infrastructure - prerequisite: parser enhancement
On Tue, 16 May 2006, Martin Peschke wrote:

> This patch adds two match_* derivates for 64 bit operands to the parser
> library.
>
> Signed-off-by: Martin Peschke <mp3@de.ibm.com>
> ---
>
> include/linux/parser.h | 2 +
> lib/parser.c | 60
> +++++++++++++++++++++++++++++++++++++++++++++++++
> 2 files changed, 62 insertions(+)
>
> diff -Nurp a/include/linux/parser.h b/include/linux/parser.h
> --- a/include/linux/parser.h 2006-03-20 06:53:29.000000000 +0100
> +++ b/include/linux/parser.h 2006-05-15 17:56:25.000000000 +0200
> @@ -31,3 +31,5 @@ int match_octal(substring_t *, int *resu
> int match_hex(substring_t *, int *result);
> void match_strcpy(char *, substring_t *);
> char *match_strdup(substring_t *);
> +int match_u64(substring_t *, u64 *result, int);
> +int match_s64(substring_t *, s64 *result, int);
> diff -Nurp a/lib/parser.c b/lib/parser.c
> --- a/lib/parser.c 2006-03-20 06:53:29.000000000 +0100
> +++ b/lib/parser.c 2006-05-15 17:56:25.000000000 +0200
> @@ -140,6 +140,64 @@ static int match_number(substring_t *s,
> }
>
> /**
> + * match_u64: scan a number in the given base from a substring_t
> + * @s: substring to be scanned
> + * @result: resulting integer on success
> + * @base: base to use when converting string
> + *
> + * Description: Given a &substring_t and a base, attempts to parse the
> substring
> + * as a number in that base. On success, sets @result to the u64 represented
> + * by the string and returns 0. Returns either -ENOMEM or -EINVAL on
> failure.
> + */
> +int match_u64(substring_t *s, u64 *result, int base)
> +{
> + char *endp;
> + char *buf;
> + int ret;
> +
> + buf = kmalloc(s->to - s->from + 1, GFP_KERNEL);
> + if (!buf)
> + return -ENOMEM;
> + memcpy(buf, s->from, s->to - s->from);
> + buf[s->to - s->from] = '\0';

Why not match_strdup:

buf = match_strdup(s);
if (unlikely(!buf))
return -ENOMEM;

> + *result = simple_strtoull(buf, &endp, base);
> + ret = 0;
> + if (endp == buf)
> + ret = -EINVAL;
> + kfree(buf);
> + return ret;
> +}
> +
> +/**
> + * match_s64: scan a number in the given base from a substring_t
> + * @s: substring to be scanned
> + * @result: resulting integer on success
> + * @base: base to use when converting string
> + *
> + * Description: Given a &substring_t and a base, attempts to parse the
> substring
> + * as a number in that base. On success, sets @result to the s64 represented
> + * by the string and returns 0. Returns either -ENOMEM or -EINVAL on
> failure.
> + */
> +int match_s64(substring_t *s, s64 *result, int base)
> +{
> + char *endp;
> + char *buf;
> + int ret;
> +
> + buf = kmalloc(s->to - s->from + 1, GFP_KERNEL);
> + if (!buf)
> + return -ENOMEM;
> + memcpy(buf, s->from, s->to - s->from);
> + buf[s->to - s->from] = '\0';

Same story here.

> + *result = simple_strtoll(buf, &endp, base);
> + ret = 0;
> + if (endp == buf)
> + ret = -EINVAL;
> + kfree(buf);
> + return ret;
> +}
> +
> +/**
> * match_int: - scan a decimal representation of an integer from a
> substring_t
> * @s: substring_t to be scanned
> * @result: resulting integer on success
> @@ -218,3 +276,5 @@ EXPORT_SYMBOL(match_octal);
> EXPORT_SYMBOL(match_hex);
> EXPORT_SYMBOL(match_strcpy);
> EXPORT_SYMBOL(match_strdup);
> +EXPORT_SYMBOL(match_u64);
> +EXPORT_SYMBOL(match_s64);

Thanks,
Chase
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
\
 
 \ /
  Last update: 2006-05-16 20:38    [W:2.158 / U:1.640 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site