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parser: add u64 number parser 

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

Signed-off-by: James Smart <james.smart@broadcom.com>
Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
zero-colors
James Smart 2016-10-21 23:51:54 +03:00 committed by Sagi Grimberg
parent 27a4beef0b
commit a317178e36
2 changed files with 48 additions and 0 deletions
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1
include/linux/parser.h
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@ -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);

47
lib/parser.c
View File

@ -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