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Avoid overflow in dblExp that prevents subnormal numbers from being
generated (or small normal numbers if `double` supports many more
negative exponents than positive): if `10**abs(exp)` would overflow
and we actually want a negative exponent, switch to using precomputed
negative powers of 10 rather than positive.
Also avoid underflow for numbers with a large negative exponent where
the exponent alone underflows but the significand has enough digits to
cancel this out, e. g. in `10e-324` with IEEE 754 double.
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The exponent may overflow an integer, e. g. in
`14e888888888888888888888888888880000000000000000000000000000`
on a 32-bit platform. Correctly handle this, including the case
when the exponent overflows but the whole string still describes
a valid floating-point number, e. g. in
`1[4294967200 zeros]e-4294967300`.
This fixes libass#244. Buffer overflow was fixed in 67f647e, and
this ensures that the string is converted to the correct number.
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ass_strtod reads at most 18 leading digits of the mantissa.
This previously included zeros, even though they are not significant
digits, e. g. 0.000000000000000001e18 was converted to 0.0.
After this commit, leading zeros before and after the decimal point
will be skipped, so the above number will be correctly converted to 1.0.
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This fixes overflow on extremely long input strings.
See libass#244.
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As before, this does not add any build system support:
a config.h file and a project must still be manually created
(or the compiler can be run manually instead of using a project).
Signed-off-by: Grigori Goronzy <greg@kinoho.net>
Signed-off-by: Oleg Oshmyan <chortos@inbox.lv>
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This way, #include "config.h" is consistently the very
first thing the compiler sees when compiling any file.
Some source files currently don't use anything defined in config.h,
but it's easier and less error-prone to include it now to anticipate
possible future changes in those files, config.h or other headers.
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OS or platform-specific locale independent functions are painful to
use and/or not available, so roll our own. Not great but the least
painful and least intrusive.
v2: fix indexing, use static inline
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strtod respects the locale and in some locales, the decimal separator is
not a point, leading to parsing errors in tags like \pos(23.4,5), which
are perfectly valid.
As there isn't a really portable way to use a particular locale just for
one call to strtod, reimplement it. The implementation was taken from
the 1.8 branch of Ruby.
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