Python 3.12: PyUnicode_AS_UNICODE has been removed

[sanjayankur31]

Description:

In Python 3.12, PyUnicdeo_AS_UNICODE has been removed:

https://peps.python.org/pep-0623/#python-3-12

It's still used in https://github.com/urwid/urwid/blob/f7d2f2f6a8a519bd64ebbe1895e5c6b5948199f3/source/str_util.c

Affected versions (if applicable)

• master branch (specify commit)
• Latest stable version from pypi
• Other (specify source)

Steps to reproduce (if applicable)

Attempting to build urwid will give errors of this form:

gcc ... -fPIC -I/usr/include/python3.12 -c source/str_util.c -o
build/temp.linux-x86_64-cpython-312/source/str_util.o
source/str_util.c: In function ‘Py_IsWideChar’:
source/str_util.c:484:16: warning: implicit declaration of function
‘PyUnicode_AS_UNICODE’; did you mean ‘PyUnicode_AsUCS4’?
[-Wimplicit-function-declaration]
  484 |         ustr = PyUnicode_AS_UNICODE(text);
      |                ^~~~~~~~~~~~~~~~~~~~
      |                PyUnicode_AsUCS4
source/str_util.c:484:14: warning: assignment to ‘Py_UNICODE *’ {aka
‘int *’} from ‘int’ makes pointer from integer without a cast
[-Wint-conversion]
  484 |         ustr = PyUnicode_AS_UNICODE(text);
      |              ^
source/str_util.c: In function ‘Py_CalcWidth’:
source/str_util.c:663:14: warning: assignment to ‘Py_UNICODE *’ {aka
‘int *’} from ‘int’ makes pointer from integer without a cast
[-Wint-conversion]
  663 |         ustr = PyUnicode_AS_UNICODE(text);
      |              ^
source/str_util.c: In function ‘Py_CalcTextPos’:
source/str_util.c:749:14: warning: assignment to ‘Py_UNICODE *’ {aka
‘int *’} from ‘int’ makes pointer from integer without a cast
[-Wint-conversion]
  749 |         ustr = PyUnicode_AS_UNICODE(text);
      |              ^

Expected/actual outcome

[...]