Programming

Thanks for ur reply
Here is my code.
This is the getsubstring function am using to get substring
char* getsubstring(const char* str, size_t begin, size_t len)
{
if (str == 0 || strlen(str) == 0)
return 0;
return strndup(str + begin, len);
}

and here is, how am catching the retrun char
char* cResponse = GetResponsePrimaryElements(cRPSegBin);

/* my input will be like this cRPSegBin = 11111110000000011111111000000000111111........ */

--> when i try to compile with -g, i got this
cc: 1501-218 (W) file testmsgparse.exe contains an incorrect file suffix
ld: 0711-224 WARNING: Duplicate symbol: __start
ld: 0711-224 WARNING: Duplicate symbol: .__start
ld: 0711-224 WARNING: Duplicate symbol: __threads_init
ld: 0711-224 WARNING: Duplicate symbol: .__threads_init
ld: 0711-224 WARNING: Duplicate symbol: .main
ld: 0711-224 WARNING: Duplicate symbol: .getsubstring
ld: 0711-224 WARNING: Duplicate symbol: .GetResponseSecondaryElements
ld: 0711-224 WARNING: Duplicate symbol: .GetResponsePrimaryElements
ld: 0711-224 WARNING: Duplicate symbol: .GetSecondaryDataElements
ld: 0711-224 WARNING: Duplicate symbol: .GetPrimaryDataElements
ld: 0711-224 WARNING: Duplicate symbol: .ConvertHexToBinary
ld: 0711-224 WARNING: Duplicate symbol: .GetOriginator
ld: 0711-224 WARNING: Duplicate symbol: .GetMessageFunction
ld: 0711-224 WARNING: Duplicate symbol: .GetMessageClass
ld: 0711-224 WARNING: Duplicate symbol: .GetMTIversion
ld: 0711-345 Use the -bloadmap or -bnoquiet option to obtain more information.

What does this mean? How to interpret this?

---------- Post updated at 06:39 AM ---------- Previous update was at 06:22 AM ----------

Thanks Kumaran,
I got it by modifying my getsubstring method as

char* getsubstring(const char* str, size_t begin, size_t len)
{
if (str == 0 || strlen(str) == 0 || strlen(str) < begin || strlen(str) < (begin+len))
return 0;
return strndup(str + begin, len);
}

thanks to all