I don't want to unnecessarily re-invent the wheel, but I have been looking for the functionality of strtod but with a base parameter (2,8,10,16). (I know strtoul allows a base parameter but I'm looking for return type double). Any advice / pointers in the right direction? Thanks.
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For arbitrary base, this is a hard problem, but as long as your base is a power of two, the plain naive algorithm will work just fine.
strtod
(in C99) supports hex floats in the same format as the C language's hex float constants.0x
prefix is required,p
separates the exponent, and the exponent is in base 10 and represents a power of 2. If you need to support pre-C99 libraries, you'll have no such luck. But since you need base 2/4/8 too, it's probably just best to roll your own anyway.Edit: An outline of the naive algorithm:
double
or whatever, as you prefer) initialized to 0.If you want to handle potentially rounding up forms that have too many digits, you have to work out that logic once you exceed the number of significant places in step 2 or 3. Otherwise you can ignore that.