Bug: Save game > filename caret is misaligned

[DanSorrell]

./src/uqm/gameopt.c

static BOOLEAN
DrawSaveNameString (UNICODE *Str, COUNT CursorPos, COUNT state, COUNT gameIndex)
{

Currently line 494 ...

Change this:
FullCursorPos = CursorPos + (COUNT)strlen(dateStr) - 1;

To this:
FullCursorPos = CursorPos + (COUNT)strlen(dateStr);

[JHGuitarFreak]

Taking out the -1 causes all kinds of problems for me when editing save names.

[DanSorrell]

My initial, low effort, analysis started with me implementing the ISO date format in my local copy of the game’s code:

I then “fixed” the caret on my end by deleting the minus one. The real solution is to change the line to:
FullCursorPos = CursorPos + (COUNT)utf8StringCount(dateStr);

Explanation:

• Caret positioning is based on the count of code points, not the count of bytes.
• utf8StringCount() within ./src/libs/strings/unicode.c counts code points.
• strlen() within C’s standard lib counts bytes.
• The middle-dot (code point 183) separator within the date strings is 2 bytes wide in utf-8.
• The default date format of “MMM DD·YYYY” has one middle-dot making the string’s byte count longer than its code-point count by one. Somebody arbitrarily subtracted one to resolve the difference.
• Two of the date formats have 2 middle-dots. These require a subtraction of 2 to work properly.
• My ISO implementation has the same count of bytes as its count of code points. So this requires a subtraction of zero to work properly.

[JHGuitarFreak]

Ah, there we go, I knew there had to be a more elegant solution.
Implemented in commit 4e12529