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Commit a317178e authored by James Smart's avatar James Smart Committed by Sagi Grimberg
Browse files

parser: add u64 number parser 



Will be used by the nvme-fabrics FC transport in parsing options

Signed-off-by: default avatarJames Smart <james.smart@broadcom.com>
Signed-off-by: default avatarSagi Grimberg <sagi@grimberg.me>
parent 27a4beef

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