---
title: IOParseBootArgString
framework: driverkit
role: symbol
role_heading: Function
path: driverkit/ioparsebootargstring
---

# IOParseBootArgString

Parses any boot arguments in the macOS kernel boot-args.

## Declaration

```occ
bool IOParseBootArgString(const char *arg_string, char *arg_ptr, int strlen);
```

## Parameters

- `arg_string`: C-string name of the argument.
- `arg_ptr`: Pointer to char array to received parsed value.
- `strlen`: Size in bytes of the char array pointed to by arg_ptr.

## Return Value

Return Value True if the argument was found and parsed successfully to arg_ptr.

## Discussion

Discussion If the named argument is present in the kernel boot-args, return its value as a c-string.

## See Also

### Boot Support

- [IOParseBootArgNumber](driverkit/ioparsebootargnumber.md)