Add support for UTF-8 identifiers

[elnull]

Here's valid example in GO language with UTF-8 identifiers:

package main
import "fmt"

func main() {
    var пример = "aaa"
    var 世界 = "bbb"
    fmt.Println(пример, 世界)
}

This is output of GDB session

Breakpoint 1, main.main () at a.go:4
4 func main() {
(gdb) n
5 var пример = "aaa"
(gdb) n
6 var 世界 = "bbb"
(gdb) n
7 fmt.Println(пример, 世界)
(gdb) n
aaa bbb
8 }

This is output of CGDB session

func main() {
var M-PM-?M-Q~@M-PM-8M-PM-<M-PM-5M-Q~@ = "aaa"
var M-dM-8VM-gUL = "bbb"
fmt.Println(M-PM-?M-Q@M-PM-8M-PM-<M-PM-5M-Q~@, M-dM-8VM-gU~L)
}

[ibuclaw]

I'll add an extra note that D supports UTF-8 characters in variable names as well. :)

[forslund]

To get cgdb to show the variables correctly doesn't seem to be too hard ncurses just need to be replaced with ncursesw (the branch utf8-fix on my fork of cgdb adds a check for ncursesw and uses it if it's available) the problem seem to be that the gdb entry field doesn't accept utf-8 characters so it's impossible to inspect variables with names containing utf-8 symbols. I'll look into the issue and see if I can figure out a way to get it to work...

[forslund]

Ok, this will take some time =) handling of the input in scroller.c is pretty complicated as it is and to add support for utf-8 will take some effort. I'll keep at it but this will take some time.

[oblitum]

I'm using gdb 7.5.91.20130417 on Ubuntu 13.04 and, by default, it doesn't support referring to UTF-8 named variables. It displays them correctly, like already said, but trying out p 世界 for example, generates an error about invalid characters on input.

I've added more fixes for UTF-8 display upon @forslund changes at #32.

[mikesart]

I believe this was fixed. If not, please enter a new bug. Thanks!