Convert Numbers to/from Strings problem

[tevez]

Hi all,

We are doing a project which optimizes the source code of our system.
This system is very old and written by VC6.

Two of optimized contents are:
- Replace all conversion functions, which convert Strings to Numbers, with strtod and strtol functions. The reasons are to use error checking mechanism of strtod and strtol functions (Check overflow).
- The second content is to optimize conversion functions, which convert Numbers to Strings.
I think using itoa function is a bad idea because itoa is not a C standard function. Using sscanf is not good, because it has no error checking mechanism. I am thinking about using sprintf() function, but someone told me that this function is not safetype.

So could you please provide some suggestion on the second content?

Should I use STL class?

Regards,
Tevez