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[PATCHv12 1/3] lib/string: add sysfs_match_string helper

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  [PATCHv12 1/3] lib/string: add sysfs_match_string helper Heikki Krogerus <heikki.krogerus@linux.intel.com> - 2016-11-22 15:20 +0100
    Re: [PATCHv12 1/3] lib/string: add sysfs_match_string helper Guenter Roeck <linux@roeck-us.net> - 2016-11-23 17:20 +0100
    Re: [PATCHv12 1/3] lib/string: add sysfs_match_string helper Guenter Roeck <linux@roeck-us.net> - 2016-11-24 01:20 +0100

#1527536 — [PATCHv12 1/3] lib/string: add sysfs_match_string helper

Make a simple helper for matching strings with sysfs
attribute files. In most parts the same as match_string(),
except sysfs_match_string() uses sysfs_streq() instead of
strcmp() for matching. This is more convenient when used
with sysfs attributes.

Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
---
 include/linux/string.h | 10 ++++++++++
 lib/string.c           | 26 ++++++++++++++++++++++++++
 2 files changed, 36 insertions(+)

diff --git a/include/linux/string.h b/include/linux/string.h
index 26b6f6a..c4011b2 100644
--- a/include/linux/string.h
+++ b/include/linux/string.h
@@ -135,6 +135,16 @@ static inline int strtobool(const char *s, bool *res)
 }
 
 int match_string(const char * const *array, size_t n, const char *string);
+int __sysfs_match_string(const char * const *array, size_t n, const char *s);
+
+/**
+ * sysfs_match_string - matches given string in an array
+ * @_a: array of strings
+ * @_s: string to match with
+ *
+ * Helper for __sysfs_match_string(). Calculates the size of @a automatically.
+ */
+#define sysfs_match_string(_a, _s) __sysfs_match_string(_a, ARRAY_SIZE(_a), _s)
 
 #ifdef CONFIG_BINARY_PRINTF
 int vbin_printf(u32 *bin_buf, size_t size, const char *fmt, va_list args);
diff --git a/lib/string.c b/lib/string.c
index ed83562..c7a20cb 100644
--- a/lib/string.c
+++ b/lib/string.c
@@ -656,6 +656,32 @@ int match_string(const char * const *array, size_t n, const char *string)
 }
 EXPORT_SYMBOL(match_string);
 
+/**
+ * __sysfs_match_string - matches given string in an array
+ * @array: array of strings
+ * @n: number of strings in the array or -1 for NULL terminated arrays
+ * @str: string to match with
+ *
+ * Returns index of @str in the @array or -EINVAL, just like match_string().
+ * Uses sysfs_streq instead of strcmp for matching.
+ */
+int __sysfs_match_string(const char * const *array, size_t n, const char *str)
+{
+	const char *item;
+	int index;
+
+	for (index = 0; index < n; index++) {
+		item = array[index];
+		if (!item)
+			break;
+		if (!sysfs_streq(item, str))
+			return index;
+	}
+
+	return -EINVAL;
+}
+EXPORT_SYMBOL(__sysfs_match_string);
+
 #ifndef __HAVE_ARCH_MEMSET
 /**
  * memset - Fill a region of memory with the given value
-- 
2.10.2

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#1528550

On Tue, Nov 22, 2016 at 04:11:45PM +0200, Heikki Krogerus wrote:
> Make a simple helper for matching strings with sysfs
> attribute files. In most parts the same as match_string(),
> except sysfs_match_string() uses sysfs_streq() instead of
> strcmp() for matching. This is more convenient when used
> with sysfs attributes.
> 
> Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>

Reviewed-by: Guenter Roeck <linux@roeck-us.net>

> ---
>  include/linux/string.h | 10 ++++++++++
>  lib/string.c           | 26 ++++++++++++++++++++++++++
>  2 files changed, 36 insertions(+)
> 
> diff --git a/include/linux/string.h b/include/linux/string.h
> index 26b6f6a..c4011b2 100644
> --- a/include/linux/string.h
> +++ b/include/linux/string.h
> @@ -135,6 +135,16 @@ static inline int strtobool(const char *s, bool *res)
>  }
>  
>  int match_string(const char * const *array, size_t n, const char *string);
> +int __sysfs_match_string(const char * const *array, size_t n, const char *s);
> +
> +/**
> + * sysfs_match_string - matches given string in an array
> + * @_a: array of strings
> + * @_s: string to match with
> + *
> + * Helper for __sysfs_match_string(). Calculates the size of @a automatically.
> + */
> +#define sysfs_match_string(_a, _s) __sysfs_match_string(_a, ARRAY_SIZE(_a), _s)
>  
>  #ifdef CONFIG_BINARY_PRINTF
>  int vbin_printf(u32 *bin_buf, size_t size, const char *fmt, va_list args);
> diff --git a/lib/string.c b/lib/string.c
> index ed83562..c7a20cb 100644
> --- a/lib/string.c
> +++ b/lib/string.c
> @@ -656,6 +656,32 @@ int match_string(const char * const *array, size_t n, const char *string)
>  }
>  EXPORT_SYMBOL(match_string);
>  
> +/**
> + * __sysfs_match_string - matches given string in an array
> + * @array: array of strings
> + * @n: number of strings in the array or -1 for NULL terminated arrays
> + * @str: string to match with
> + *
> + * Returns index of @str in the @array or -EINVAL, just like match_string().
> + * Uses sysfs_streq instead of strcmp for matching.
> + */
> +int __sysfs_match_string(const char * const *array, size_t n, const char *str)
> +{
> +	const char *item;
> +	int index;
> +
> +	for (index = 0; index < n; index++) {
> +		item = array[index];
> +		if (!item)
> +			break;
> +		if (!sysfs_streq(item, str))
> +			return index;
> +	}
> +
> +	return -EINVAL;
> +}
> +EXPORT_SYMBOL(__sysfs_match_string);
> +
>  #ifndef __HAVE_ARCH_MEMSET
>  /**
>   * memset - Fill a region of memory with the given value
> -- 
> 2.10.2
> 

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#1528875

On Tue, Nov 22, 2016 at 04:11:45PM +0200, Heikki Krogerus wrote:
> Make a simple helper for matching strings with sysfs
> attribute files. In most parts the same as match_string(),
> except sysfs_match_string() uses sysfs_streq() instead of
> strcmp() for matching. This is more convenient when used
> with sysfs attributes.
> 
> Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>

Tested-by: Guenter Roeck <linux@roeck-us.net>

> ---
>  include/linux/string.h | 10 ++++++++++
>  lib/string.c           | 26 ++++++++++++++++++++++++++
>  2 files changed, 36 insertions(+)
> 
> diff --git a/include/linux/string.h b/include/linux/string.h
> index 26b6f6a..c4011b2 100644
> --- a/include/linux/string.h
> +++ b/include/linux/string.h
> @@ -135,6 +135,16 @@ static inline int strtobool(const char *s, bool *res)
>  }
>  
>  int match_string(const char * const *array, size_t n, const char *string);
> +int __sysfs_match_string(const char * const *array, size_t n, const char *s);
> +
> +/**
> + * sysfs_match_string - matches given string in an array
> + * @_a: array of strings
> + * @_s: string to match with
> + *
> + * Helper for __sysfs_match_string(). Calculates the size of @a automatically.
> + */
> +#define sysfs_match_string(_a, _s) __sysfs_match_string(_a, ARRAY_SIZE(_a), _s)
>  
>  #ifdef CONFIG_BINARY_PRINTF
>  int vbin_printf(u32 *bin_buf, size_t size, const char *fmt, va_list args);
> diff --git a/lib/string.c b/lib/string.c
> index ed83562..c7a20cb 100644
> --- a/lib/string.c
> +++ b/lib/string.c
> @@ -656,6 +656,32 @@ int match_string(const char * const *array, size_t n, const char *string)
>  }
>  EXPORT_SYMBOL(match_string);
>  
> +/**
> + * __sysfs_match_string - matches given string in an array
> + * @array: array of strings
> + * @n: number of strings in the array or -1 for NULL terminated arrays
> + * @str: string to match with
> + *
> + * Returns index of @str in the @array or -EINVAL, just like match_string().
> + * Uses sysfs_streq instead of strcmp for matching.
> + */
> +int __sysfs_match_string(const char * const *array, size_t n, const char *str)
> +{
> +	const char *item;
> +	int index;
> +
> +	for (index = 0; index < n; index++) {
> +		item = array[index];
> +		if (!item)
> +			break;
> +		if (!sysfs_streq(item, str))
> +			return index;
> +	}
> +
> +	return -EINVAL;
> +}
> +EXPORT_SYMBOL(__sysfs_match_string);
> +
>  #ifndef __HAVE_ARCH_MEMSET
>  /**
>   * memset - Fill a region of memory with the given value
> -- 
> 2.10.2
> 

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