util: Add ParseUInt32 and ParseUInt64 #8168
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Add error and range-checking parsers for unsigned 32 and 64 bit numbers. The 32-bit variant is required for parsing sequence numbers from the command line in `bitcoin-tx` (see bitcoin#8164 for discussion). I've thrown in the 64-bit variant as a bonus, as I'm sure it will be needed at some point. Also adds tests, and updates `developer-notes.md`.
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utACK e012f3c. I think we also need them in init.cpp |
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utACK e012f3c |
| // Note that strtoul returns a *unsigned long int*, so even if it doesn't report a over/underflow | ||
| // we still have to check that the returned value is within the range of an *uint32_t*. On 64-bit | ||
| // platforms the size of these types may be different. | ||
| return endp && *endp == 0 && !errno && |
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Instead of checking whether *endp == 0, shouldn't you check whether endp == str.c_str() + str.size() (otherwise you'd accept strings that have a 0 inside)
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Yes, that solution would be somewhat more elegant. Indeed, ParsePrechecks checks some number-parsing preconditions such as that one.
I'm thinking about (at some point) implementing these functions from scratch instead of calling out to the C API. It wouldn't even be much longer, as there are just too many exceptions. This still doesn't exclude strto*l accepting locale-specific separators, for example. Not a big deal for current uses, but I hate such surprises.
In any case introducing them here (with tests) allows swapping out the implementation later.
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utACK e012f3c |
e012f3c util: Add ParseUInt32 and ParseUInt64 (Wladimir J. van der Laan)
e012f3c util: Add ParseUInt32 and ParseUInt64 (Wladimir J. van der Laan)
e012f3c util: Add ParseUInt32 and ParseUInt64 (Wladimir J. van der Laan)
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Add error and range-checking parsers for unsigned 32 and 64 bit numbers.
The 32-bit variant is required for parsing sequence numbers from the command line in
bitcoin-tx(see #8164 for discussion). I've thrown in the 64-bit variant as a bonus, as I'm sure it will be needed at somepoint.
Also adds tests, and updates
developer-notes.md.