On Wed, 27 Apr 2011 18:16:45 +0200 Stefan Assmann wrote:
> Adding this function to allow easy parsing of unsigned long values from the
> beginning of strings. Convenience function to parse pointers from the kernel
> command line.
>
> Signed-off-by: Stefan Assmann <sassmann@xxxxxxxxx>
> ---
> include/linux/kernel.h | 1 +
> lib/cmdline.c | 35 +++++++++++++++++++++++++++++++++++
> 2 files changed, 36 insertions(+), 0 deletions(-)
>
> diff --git a/include/linux/kernel.h b/include/linux/kernel.h
> index 2fe6e84..b6ded39 100644
> --- a/include/linux/kernel.h
> +++ b/include/linux/kernel.h
> @@ -218,6 +218,7 @@ extern int vsscanf(const char *, const char *, va_list)
>
> extern int get_option(char **str, int *pint);
> extern char *get_options(const char *str, int nints, int *ints);
> +extern int get_next_ulong(char **str, unsigned long *val, char sep, int base);
> extern unsigned long long memparse(const char *ptr, char **retptr);
>
> extern int core_kernel_text(unsigned long addr);
> diff --git a/lib/cmdline.c b/lib/cmdline.c
> index f5f3ad8..82a6616 100644
> --- a/lib/cmdline.c
> +++ b/lib/cmdline.c
> @@ -114,6 +114,41 @@ char *get_options(const char *str, int nints, int *ints)
> }
>
> /**
> + * get_next_ulong - Parse unsigned long at the beginning of a string
> + * @strp: (output) String to be parsed
^ input/output
> + * @val: (output) unsigned long carrying the result
> + * @sep: character specifying the separator
> + * @base: number system of the parsed value
> + *
> + * This function parses an unsigned long value at the beginning of a
> + * string. The string may begin with a separator or an unsigned long
> + * value.
> + * After the function is run val will contain the parsed value and strp
@val @strp
> + * will point to the character *after* the parsed unsigned long.
> + *
> + * In the error case 0 is returned, val and *strp stay unaltered.
@val and @strp
> + * Otherwise return 1.
> + */
> +int get_next_ulong(char **strp, unsigned long *val, char sep, int base)
> +{
> + char *tmp;
> +
> + if (!strp || !(*strp))
> + return 0;
> +
> + tmp = *strp;
> + if (*tmp == sep)
> + tmp++;
> +
> + *val = simple_strtoul(tmp, strp, base);
> +
> + if (tmp == *strp)
> + return 0; /* no new value parsed */
> + else
> + return 1;
> +}
> +
> +/**
> * memparse - parse a string with mem suffixes into a number
> * @ptr: Where parse begins
> * @retptr: (output) Optional pointer to next char after parse completes
> --
---
~Randy
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