kstrtoull
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## Name

kstrtoull — convert a string to an unsigned long long

## Synopsis

`int kstrtoull (` | const char * s,
| unsigned int base,
| unsigned long long * res`)`;

## Arguments

`s`

  The start of the string. The string must be null-terminated, and may also include a single newline before its terminating null. The first character may also be a plus sign, but not a minus sign.

`base`

  The number base to use. The maximum supported base is 16. If base is given as 0, then the base of the string is automatically detected with the conventional semantics - If it begins with 0x the number will be parsed as a hexadecimal (case insensitive), if it otherwise begins with 0, it will be parsed as an octal number. Otherwise it will be parsed as a decimal.

`res`

  Where to write the result of the conversion on success.

## Description

Returns 0 on success, -ERANGE on overflow and -EINVAL on parsing error. Used as a replacement for the obsolete simple_strtoull. Return code must be checked.

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