25 lines
838 B
Python
25 lines
838 B
Python
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# test formatting floats with large precision, that it doesn't overflow the buffer
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def test(num, num_str):
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if num == float('inf') or num == 0.0 and num_str != '0.0':
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# skip numbers that overflow or underflow the FP precision
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return
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for kind in ('e', 'f', 'g'):
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# check precision either side of the size of the buffer (32 bytes)
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for prec in range(23, 36, 2):
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fmt = '%.' + '%d' % prec + kind
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s = fmt % num
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check = abs(float(s) - num)
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if num > 1:
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check /= num
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if check > 1e-6:
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print('FAIL', num_str, fmt, s, len(s), check)
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# check pure zero
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test(0.0, '0.0')
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# check most powers of 10, making sure to include exponents with 3 digits
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for e in range(-101, 102):
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num = pow(10, e)
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test(num, '1e%d' % e)
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