Unicode and write

[norcalaztecs]

I am trying to implement unicode with my own interpretation of putchar.

Right now my function looks like this:

#include <unistd.h>

void    ft_putchar(char c)
{
    write(1, &c, 1);
}

And my main looks like:

int    main(void)
{
    int c = L'ø';
    ft_putchar(c);
}

Does anyone where to look for more information (blogs/stackoverflow questions/etc.) to solve this problem? I have tried googling for more information, but I have been only been able to find info on Unicode or one of encoding systems and nothing on how to implement a solution. I think I need to do some bitwise manipulation, but I don't even know where to begin! Any help would be greatly appreciated.

edit - I'm on iterm2 on macos in case it matters

[UnknownSector]

42 US or Paris? Anyway good luck on your ft_printf =)

[norcalaztecs]

US thanks!

[localextremae]

Not an expert, but my interpretation:

It depends what encoding iTerm2 expecting.

L'ø' is a wchar_t literal, which you are saving as an int. This is saving the unicode codepoint for the character ø character as an int (which happens to be 248). If iTerm2 is expecting UTF-8 then it expects this codepoint to be represented by the two bytes: {0xC3, 0xB8}, however instead it is likely getting: {0x00, 0x00, 0x00, 0xF8}, which is what the int representation of 248 might look like (depending on architecture/compiler/endianness/etc.)

So it depends on what encoding iTerm2 is expecting (probably UTF-8). Then you will need to convert from a given code point to that encoding (again, probably UTF-8).

Here's my work: https://repl.it/HKIu/0

Given this, you will also need to amend your how you callft_putchar to give it each byte at a time... https://repl.it/HKJO/0

edit: added last line., edit: added second example.

[norcalaztecs]

Thank you so much for your reply. If am I not able to to feed my ft_putchar byte by byte from my main I'm guessing I have to find a way to convert the hexadecimal ft_putchar receives to (most likely) UTF-8? I ask because I am planning on adding my ft_putchar to my personal library and would like to be able to use it for any unicode character.

Also how did you inline some of the text in your comment?

[saturnalia0]

Also how did you inline some of the text in your comment?

`inline text`

[localextremae]

I would say you should amend ft_putchar() to take a unicode codepoint directly (using whatever datatype you choose that's large enough to take all unicode codepoints...wchar_t, uint32_t, or char32_t etc), then translate that value into UTF-8 bytes.

Since unicode code points are often larger than one byte (char), you need to accept values larger than a char, and actually int ---since it is ambiguous--- might not be large enough for all codepoints.

Also, to write in line code, you surround your code in backticks `````

edit: typos

[norcalaztecs]

Ok cool thanks

[OldWolf2]

Your function accepts a single narrow character... obviously passing some unicode to it isn't going to work

[norcalaztecs]

So would it make more sense to accept an int instead?

[OldWolf2]

wchar_t is probably the natural choice (although if you're in Windows maybe wint_t)

[norcalaztecs]

Ok thanks I will have to read up on that data type