pointer, malloc and char in C
- by user2534078
im trying to copy a const char array to some place in the memory and point to it .
lets say im defining this var under the main prog :
char *p = NULL;
and sending it to a function with a string :
myFunc(&p, "Hello");
now i want that at the end of this function the pointer will point to the letter H but if i puts() it, it will print Hello .
here is what i tried to do :
void myFunc(char** ptr , const char strng[] ) {
*ptr=(char *) malloc(sizeof(strng));
char * tmp=*ptr;
int i=0;
while (1) {
*ptr[i]=strng[i];
if (strng[i]=='\0') break;
i++;
}
*ptr=tmp;
}
i know its a rubbish now, but i would like to understand how to do it right, my idea was to allocate the needed memory, copy a char and move forward with the pointer, etc..
also i tried to make the ptr argument byreferenec (like &ptr) but with no success due to a problem with the lvalue and rvalue .
the only thing is changeable for me is the function, and i would like not to use strings, but chars as this is and exercise .
thanks for any help in advance.
