Minimal dependency, easy to understand string to floating point number conversion.
- C compiler with unsigned 64-bit integer type and basic arithmetic on it (comparision, addition, subtraction, bit shifts).
- <stdint.h> header file or its equivalent defining
- It is assumed that
inttype is at least 16-bit wide.
- Size of other types and system endianess are not important.
- The C standard library is not required, unless a compiler needs it to provide the above features.
- No other libraries are required.
- Converts an ASCII string to IEEE 754 double precision number.
- Supports scientific notation, all common abbreviations (no zero before dot, ommitted plus signs).
- The code is easy to understand, algorithm is explained in details.
- The code is splitted into parser and converter parts, which are independent. Parser is easy to modify to support non-ASCII or wide chars.
- Parser reads character by character, so can work with pipe style inputs. There is no limit for length of string, string is not buffered.
- Small in size. On most platforms the compiled code is less than 2 kB.
- Uses no floating point arithmetic by itself.
- Covers full range of double precision numbers with precise limit checking.
- Numbers out of range are converted to infinity with proper sign.
- Very small numbers are converted to zero with proper sign.
- No support for explicit "+Inf", "-Inf", "NaN" strings.
- Denormalized floats are never generated, zero of proper sign is returned instead.
- The rounding mode is always round towards zero.
- Linux on x86_64
- Linux on x86
- Linux on ARM
- Windows on x86_64
- MorphOS on PowerPC (32-bit)
- AmigaOS on M68k