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[utils] Fix _windows_write_string (Fixes #2779)
It turns out that the function did not work for outputs longer than 1024 UCS-2 tokens. Write non-BMP characters one by one to ensure that we count correctly.
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@ -923,9 +923,6 @@ def _windows_write_string(s, out):
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2: -12,
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}
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def ucs2_len(s):
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return sum((2 if ord(c) > 0xffff else 1) for c in s)
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fileno = out.fileno()
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if fileno not in WIN_OUTPUT_IDS:
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return False
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@ -959,13 +956,25 @@ def not_a_console(handle):
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if not_a_console(h):
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return False
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remaining = ucs2_len(s)
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while remaining > 0:
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def next_nonbmp_pos(s):
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try:
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return next(i for i, c in enumerate(s) if ord(c) > 0xffff)
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except StopIteration:
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return len(s)
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while s:
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count = min(next_nonbmp_pos(s), 1024)
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ret = WriteConsoleW(
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h, s, min(remaining, 1024), ctypes.byref(written), None)
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h, s, count if count else 2, ctypes.byref(written), None)
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if ret == 0:
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raise OSError('Failed to write string')
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remaining -= written.value
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if not count: # We just wrote a non-BMP character
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assert written.value == 2
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s = s[1:]
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else:
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assert written.value > 0
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s = s[written.value:]
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return True
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