[Bug 3878] New: implementation of strtol/strtod in bg_lib.c

[bugzilla-daemon at icculus.org]

http://bugzilla.icculus.org/show_bug.cgi?id=3878

           Summary: implementation of strtol/strtod in bg_lib.c
           Product: Quake 3
           Version: SVN HEAD
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: enhancement
          Priority: P3
         Component: Misc
        AssignedTo: zakk at icculus.org
        ReportedBy: bugzilla at benmachine.co.uk
         QAContact: quake3-bugzilla at icculus.org


atoi() is a pretty easy-to-use function, but it's also not very informative.
You get one integer back and that's it.
My man page for atoi recommended strtol() and strtod(), which provide greater
functionality and error-checking. They're less useful than in libc, because
errno doesn't exist, but regardless I thought they would be useful, so I
implemented them in bg_lib.c
I'm about to attach a patch for:
long strtol( const char *nptr, const char **endptr, int base );
which skips initial whitespace in nptr and performs a conversion of the
following string in the base given, which can be 2 to 36 or the special value
0, which is equivalent to 16 if the string starts with 0x, 8 if the string
starts with 0, or 10 otherwise. The conversion will not overflow: it will be
limited at LONG_MIN or LONG_MAX. *endptr is set to the character after the last
used in the conversion, which will be the value of nptr if no conversion was
possible.
double strtod( const char *nptr, const char **endptr );
similar to the above, parses a floating-point number in decimal, or hexadecimal
if the string starts with 0x. Special string values like inf and nan(0x7fffff)
are supported, along with exponents: in the decimal form, 5.2e8 means 5.2 times
ten to the power of eight; in hexadecimal 0x7f8p20 means 0x7f8 times 2 to the
power of 20 (oddly, the exponent is decimal, so this is twenty and not 32).

I tested this a little, but due to issues like bug 3718 it's not too easy to
stress-test a floating-point parser. I realise the code style is a little bit
strange at times, but I've been sitting on this for a while now and I think it
needs feedback before I can really improve it further.


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