GLibutf8_pointer_to_offset

glong
g_utf8_pointer_to_offset (
  const gchar* str,
  const gchar* pos
)

Converts from a pointer to position within a string to an integer character offset.

Since 2.10, this function allows pos to be before str, and returns a negative offset in this case.

`str`	`const gchar*`
	A UTF-8 encoded string.
	The data is owned by the caller of the function.
	The value is a NUL terminated UTF-8 string.
`pos`	`const gchar*`
	A pointer to a position within `str`.
	The data is owned by the caller of the function.
	The value is a NUL terminated UTF-8 string.

Returns:	`glong`
	The resulting character offset.