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>
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2 changed files with 48 additions and 0 deletions
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@ -27,6 +27,7 @@ typedef struct {
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int match_token(char *, const match_table_t table, substring_t args[]);
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int match_int(substring_t *, int *result);
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int match_u64(substring_t *, u64 *result);
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int match_octal(substring_t *, int *result);
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int match_hex(substring_t *, int *result);
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bool match_wildcard(const char *pattern, const char *str);
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47
lib/parser.c
47
lib/parser.c
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@ -151,6 +151,36 @@ static int match_number(substring_t *s, int *result, int base)
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return ret;
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}
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/**
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* match_u64int: scan a number in the given base from a substring_t
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* @s: substring to be scanned
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* @result: resulting u64 on success
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* @base: base to use when converting string
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*
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* Description: Given a &substring_t and a base, attempts to parse the substring
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* as a number in that base. On success, sets @result to the integer represented
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* by the string and returns 0. Returns -ENOMEM, -EINVAL, or -ERANGE on failure.
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*/
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static int match_u64int(substring_t *s, u64 *result, int base)
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{
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char *buf;
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int ret;
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u64 val;
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size_t len = s->to - s->from;
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buf = kmalloc(len + 1, GFP_KERNEL);
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if (!buf)
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return -ENOMEM;
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memcpy(buf, s->from, len);
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buf[len] = '\0';
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ret = kstrtoull(buf, base, &val);
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if (!ret)
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*result = val;
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kfree(buf);
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return ret;
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}
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/**
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* match_int: - scan a decimal representation of an integer from a substring_t
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* @s: substring_t to be scanned
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@ -166,6 +196,23 @@ int match_int(substring_t *s, int *result)
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}
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EXPORT_SYMBOL(match_int);
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/**
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* match_u64: - scan a decimal representation of a u64 from
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* a substring_t
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* @s: substring_t to be scanned
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* @result: resulting unsigned long long on success
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*
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* Description: Attempts to parse the &substring_t @s as a long decimal
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* integer. On success, sets @result to the integer represented by the
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* string and returns 0.
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* Returns -ENOMEM, -EINVAL, or -ERANGE on failure.
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*/
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int match_u64(substring_t *s, u64 *result)
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{
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return match_u64int(s, result, 0);
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}
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EXPORT_SYMBOL(match_u64);
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/**
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* match_octal: - scan an octal representation of an integer from a substring_t
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* @s: substring_t to be scanned
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