strtod return ptr not advanced if converted value =0

This code has worked for years in C51:

-----
CmdParm[CmdCnt / 2] = strtod(ParamBuf, &rPos);  // get a number
// returns with rPos pointing to the next unconverted char in the ParamBuf
if(rPos > ParamBuf)  // if something was converted
   CmdCnt += 1;
-----

I just copied it into a C166 program, and it fails to advance the "rPos" return pointer if the value it finds and converts is exactly zero. This happens even in the middle of a long string with non-zero values following the zero value. Increase the value to 0.0001 or 1 and the pointer is advanced.

It is reading ASCII zero characters, so it should be able to tell them apart from the '\0' terminator. C51 does it quite reliably.

Loren