On Windows the count argument to read and write is unsigned, so convert it from size_t preventing integer overflow.

Returns a pointer to the string data. */

Returns true iff x is divisible by pow(5, exp).

A wrapper around fwrite that throws on error.

Returns the argument with the specified id. */

Given the divisor (normally a power of 10), the remainder = v % divisor for some number v and the error, returns whether v should be rounded up, down,

Computes lhs * rhs / pow(2, 64) rounded to nearest with half-up tie breaking.

traverse the layout to locate the nearest character to a display position

API click: on mouse down, move the cursor to the clicked location, and reset the selection

discard the oldest entry in the undo list

find the x/y location of a character, and remember info about the previous row in case we get a move-up event (for page up, we'll have to rescan)

canoncialize the selection so start <= end

find minimum y position if it starts at x1

rects array must be big enough to accommodate all characters in the given ranges

check if a utf8 string contains a prefix which is the utf16 string; if so return length of matching utf8 string

\rst Returns the content of the output buffer as an ``std::string``. \endrst */

Cubic Bezier takes 4 controls points