[avr-libc-dev] [bug #23677] Request for cbrt() and strdup to be added to libc

[Andy Hutchinson]

URL:
  <http://savannah.nongnu.org/bugs/?23677>

                 Summary: Request for cbrt() and strdup to be added to libc
                 Project: AVR C Runtime Library
            Submitted by: hutchinsonandy
            Submitted on: Sunday 06/22/2008 at 21:51
                Category: Feature Request
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: libc code
                  Status: None
        Percent Complete: 0%
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
                 Release: Any
           Fixed Release: None

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Details:

It seems gcc testsuite assumes presence of widely available strdup() and
cbrt() functions.

strdup is a derivative of malloc
cbrt is cubic root x^(1/3) 

Here are some generic version that can be used as starter.
I'm sure someone can trim them up a bit - or even convert to asm.

Best version depends on how we built existing maths  functions.

double cbrt(const double x)

{
return pow(x,1.0/3.0);
}

OR

double cbrt(const double xx)
{
   double x= xx;
   if  (x==0.0) /* log will fail, but answer is easy */
      return 0.0;
   else if  (x>0.0)
       return(exp(log(x)/3.0));
   else
   x= -x;
      return(exp(log(x)/3.0));
  }



char *  strdup( const char *str)
{
       unsigned int len;
       char *copy;
       len = strlen(str) + 1;
       copy = malloc(len);
       if (!copy)
               return (copy);
       memcpy(copy, str, len);
       return (copy);
}
Andy 




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