diff options
| -rw-r--r-- | include/linux/parser.h | 1 | ||||
| -rw-r--r-- | lib/parser.c | 47 |
2 files changed, 48 insertions, 0 deletions
diff --git a/include/linux/parser.h b/include/linux/parser.h index 39d5b7955b23..884c1e6eb3fe 100644 --- a/include/linux/parser.h +++ b/include/linux/parser.h @@ -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); diff --git a/lib/parser.c b/lib/parser.c index b6d11631231b..3278958b472a 100644 --- a/lib/parser.c +++ b/lib/parser.c @@ -152,6 +152,36 @@ static int match_number(substring_t *s, int *result, int base) } /** + * 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 * @result: resulting integer on success @@ -167,6 +197,23 @@ 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 * @result: resulting integer on success |