Converting an array to use malloc - c

Question

Currently I have set up an array to hold 50 packets created by the program. However I would like to change this array to use malloc instead along with the use of storing a maximum of 50 pieces of information just as the current array does.
Here's the current code used to set up the array used under int main
struct packet create[50];
int countpackets = 0;
And the array is incremented within another function within the code as so
int add(struct packet *create, int countpackets){
char inputDest[10],inputType[4],inputPort[2],inputData[50],inputSource[10];
if (countpackets == 50){
puts("Too many packets already entered.");
}else{
printf("\n\n");
int i = 0;
printf("\t Source - Must be 1024 or below >\t");
scanf("%s", inputSource);
create[countpackets].source = atoi(inputSource);
for (i = 0; i < strlen(inputSource); i++){
while(isdigit(inputSource[i])== 0 || create[countpackets].source > 1024){
printf("************************************************** \n");
puts("Invalid input, numbers only or number too big\n");
printf("\t please re-enter your Source >");
scanf("%s", inputSource); //rescans if it's a letter
create[countpackets].source = atoi(inputSource);
}
}
printf("\t Destination - Must be 1024 or below >\t");
scanf("%s", inputDest);
create[countpackets].destination = atoi(inputDest);
for (i = 0; i < strlen(inputDest); i++)
{
while(isdigit(inputDest[i])== 0 || create[countpackets].destination > 1024){
printf("************************************************** \n");
puts("Invalid input, numbers only or number too big\n");
printf("\t please re-enter your Destination >");
scanf("%s", inputDest); //rescans if it's a letter
create[countpackets].destination = atoi(inputDest);
}
}
printf("\t Type - Must be 10 or below >\t");
scanf("%s", inputType);
create[countpackets].type = atoi(inputType);
for (i = 0; i < strlen(inputType); i++){
while(isdigit(inputType[i])== 0 || create[countpackets].type > 10){
printf("************************************************** \n");
puts("Invalid input, numbers only or number too big \t \n");
printf("\t please re-enter your Type >");
scanf("%s", inputType); //rescans if it's a letter
create[countpackets].type = atoi(inputType);
}
}
printf("\t Port - Must be 1024 or below >\t");
scanf("%s", inputPort);
create[countpackets].port = atoi(inputPort);
for (i = 0; i < strlen(inputPort); i++)
{
while(isdigit(inputPort[i])== 0 || create[countpackets].port > 1024){
printf("************************************************** \n");
puts("Invalid input, numbers only or number too big \t \n");
printf("\t please re-enter your Type >");
scanf("%s", inputPort); //rescans if it's a letter
create[countpackets].port = atoi(inputPort);
}
}
printf("\t Data have less than 50 characters >\t");
scanf("%s", inputData);
for (i = 0; i < strlen(inputData); i++){
while(isdigit(inputData[i])== 0){ //checks if it's a letter
printf("************************************************** \n");
puts("Invalid input, numbers only or number too big \t \n");
printf("\t please re-enter your Type >");
scanf("%s", inputData); //rescans if it's a letter
}
strcpy(create[countpackets].data, inputData);
}
}
countpackets++;
return countpackets;
}
I'm pretty new to C and I do believe that is all the code I need to show, however if need be I will put up my full program. Any help would be much appreciated.

Answer 1

If you want to declare this...
struct packet create[50];
...with malloc, you'll have to do this...
struct packet *pCreate = malloc(50 * sizeof(struct packet));
You can use it the same.
create[0] = pCreate[0]; // First element
create[49] = pCreate[49]; // Last element