Use `do-while(0)` to protect `ADJUST_INDICES` macro

[picnixz]

Feature or enhancement

Proposal:

Use do-while(0) construction to protect the expansion of ADJUST_INDICES in:

• cpython/Objects/unicodeobject.c

  Lines 9318 to 9330 in d6d8707

  	#define ADJUST_INDICES(start, end, len) \
  	if (end > len) \
  	end = len; \
  	else if (end < 0) { \
  	end += len; \
  	if (end < 0) \
  	end = 0; \
  	} \
  	if (start < 0) { \
  	start += len; \
  	if (start < 0) \
  	start = 0; \
  	}

• cpython/Objects/bytes_methods.c

  Lines 435 to 447 in 2cb84b1

  	#define ADJUST_INDICES(start, end, len) \
  	if (end > len) \
  	end = len; \
  	else if (end < 0) { \
  	end += len; \
  	if (end < 0) \
  	end = 0; \
  	} \
  	if (start < 0) { \
  	start += len; \
  	if (start < 0) \
  	start = 0; \
  	}

Has this already been discussed elsewhere?

No response given

Links to previous discussion of this feature:

No response

Linked PRs

• gh-121165: protect macro expansion of ADJUST_INDICES #121166