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py/formatfloat: Fix buffer overflow when formatting tiny numbers.

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This commit is contained in:
Damien George
2016-03-15 12:21:56 +00:00
parent 0d1f8868b6
commit cea6cf8a5e
2 changed files with 26 additions and 4 deletions
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16
tests/float/string_format_modulo.py
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@@ -26,3 +26,19 @@ print("%02.3d" % 123) # prec > width
print("%+f %+f" % (1.23, -1.23)) # float sign
print("% f % f" % (1.23, -1.23)) # float space sign
print("%0f" % -1.23) # negative number with 0 padding
# numbers with large negative exponents
print('%f' % 1e-10)
print('%f' % 1e-20)
print('%f' % 1e-50)
print('%f' % 1e-100)
print('%f' % 1e-300)
# large decimal precision should be truncated and not overflow buffer
# the output depends on the FP calculation so only first 2 digits are printed
# (the 'g' with small e are printed using 'f' style, so need to be checked)
print(('%.40f' % 1e-300)[:2])
print(('%.40g' % 1e-1)[:2])
print(('%.40g' % 1e-2)[:2])
print(('%.40g' % 1e-3)[:2])
print(('%.40g' % 1e-4)[:2])