parser: add u64 number parser (a317178e) · Commits · 戴 / test

include/linux/parser.h

+1 −0

Original line number	Diff line number	Diff line
		@@ -27,6 +27,7 @@ typedef struct {

		int match_token(char *, const match_table_t table, substring_t args[]);
		int match_int(substring_t , int result);
		int match_u64(substring_t , u64 result);
		int match_octal(substring_t , int result);
		int match_hex(substring_t , int result);
		bool match_wildcard(const char pattern, const char str);

lib/parser.c

+47 −0

Original line number	Diff line number	Diff line
		@@ -151,6 +151,36 @@ static int match_number(substring_t s, int result, int base)
		return ret;
		}

		/**
		* match_u64int: scan a number in the given base from a substring_t
		* @s: substring to be scanned
		* @result: resulting u64 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 integer represented
		* by the string and returns 0. Returns -ENOMEM, -EINVAL, or -ERANGE on failure.
		*/
		static int match_u64int(substring_t s, u64 result, int base)
		{
		char *buf;
		int ret;
		u64 val;
		size_t len = s->to - s->from;

		buf = kmalloc(len + 1, GFP_KERNEL);
		if (!buf)
		return -ENOMEM;
		memcpy(buf, s->from, len);
		buf[len] = '\0';

		ret = kstrtoull(buf, base, &val);
		if (!ret)
		*result = val;
		kfree(buf);
		return ret;
		}

		/**
		* match_int: - scan a decimal representation of an integer from a substring_t
		* @s: substring_t to be scanned
		@@ -166,6 +196,23 @@ int match_int(substring_t s, int result)
		}
		EXPORT_SYMBOL(match_int);

		/**
		* match_u64: - scan a decimal representation of a u64 from
		* a substring_t
		* @s: substring_t to be scanned
		* @result: resulting unsigned long long on success
		*
		* Description: Attempts to parse the &substring_t @s as a long decimal
		* integer. On success, sets @result to the integer represented by the
		* string and returns 0.
		* Returns -ENOMEM, -EINVAL, or -ERANGE on failure.
		*/
		int match_u64(substring_t s, u64 result)
		{
		return match_u64int(s, result, 0);
		}
		EXPORT_SYMBOL(match_u64);

		/**
		* match_octal: - scan an octal representation of an integer from a substring_t
		* @s: substring_t to be scanned

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