about pointer and string(strdup)

[Guest_imported]

Dear all,

In my program:

int main()
{
....
char *tmp1=new char[10];
strcpy(tmp1,"abcdefgh"
..........
char *tmp2=strdup(Somefunction(tmp1));
....//use tmp2 and tmp1 in the code below

return 0;

}

char* Somefunction(char *instr)
{
outstr=strdup(instr);
.....//do some manipulation on outstr
.....//such that the original string is not distorted
return outstr;
}

question 1:when I use strdup, do I need to check whether the return value is null,
just like malloc?
question 2:how can I free the outstr?

Thank you very much!

 

[DavesTips]

strdup() uses malloc() therefore you should presumably test that the result is not null. And you need to free the string with free().