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#include <stdio.h>
#include <stdlib.h>
#include <getopt.h>
#include <string.h>
#include "list.h"
#ifdef UNIT_TESTING
/* Redirect printf to a function in the test application so it's possible to
* test the standard output. You can ignore this; it's not relevant to the
* assignment. */
#ifdef printf
#undef printf
#endif /* printf */
extern int test_printf(const char *format,...);
#define printf test_printf
#endif
#define MAX_ITEM_PRINT_LEN 100
// Note: All list_ functions return a status code EXIT_FAILURE or EXIT_SUCCESS
// to indicate whether the operation was successful or not.
// Members of the node struct:
// char* item_name, float price, int quantity, node *next
// create a new list
int list_init(node **head) {
*head = malloc(sizeof(node));
if (*head == NULL) {
return EXIT_FAILURE;
}
(*head)->next = NULL;
return EXIT_SUCCESS;
}
// print a single list item to an externally allocated string
// This should be in the format of:
// "quantity * item_name @ $price ea", where item_name is a string and
// price is a float formatted with 2 decimal places.
int list_item_to_string(node *head, char *str) {
if (head == NULL) {
strcpy(str, "empty list");
return EXIT_SUCCESS;
}
node *current = head->next;
char *name = malloc(sizeof(char) * MAX_ITEM_PRINT_LEN);
char *price = malloc(sizeof(char) * MAX_ITEM_PRINT_LEN);
char *quantity = malloc(sizeof(char) * MAX_ITEM_PRINT_LEN);
int i = 0;
if (!name ||!price ||!quantity) {
fprintf(stderr, "Not enough memory!");
return EXIT_FAILURE;
}
while (current!= NULL) {
sprintf(name, "%s", current->item_name);
sprintf(price, "%.2f", current->price);
sprintf(quantity, "%d", current->quantity);
char *toPrint = malloc(sizeof(char) * MAX_ITEM_PRINT_LEN);
if (!toPrint) {
fprintf(stderr, "Not enough memory!");
return EXIT_FAILURE;
}
strcat(toPrint, quantity);
strcat(toPrint, " * ");
strcat(toPrint, name);
strcat(toPrint, " @ $");
strcat(toPrint, price);
strcat(toPrint, " ea");
strcpy(str + i, toPrint);
i += strlen(toPrint);
strcat(str, "\n");
free(toPrint);
current = current->next;
}
free(name);
free(price);
free(quantity);
return EXIT_SUCCESS;
}
// print the list to stdout
// This should be in the format of:
// "pos: quantity * item_name @ $price ea", where
// pos is the position of the item in the list,
// item_name is the item_name of the item and
// price is the float price of the item formatted with 2 decimal places.
// For example:
// """1: 3 * banana @ $1.00 ea
// 2: 2 * orange @ $2.00 ea
// 3: 4 * apple @ $3.00 ea
// """
// It should return a newline character at the end of each item.
// It should not have a leading newline character.
int list_print(node *head) {
if (head == NULL) {
printf("empty list\n");
return EXIT_SUCCESS;
}
node *current = head->next;
char *str = malloc(sizeof(char) * MAX_ITEM_PRINT_LEN);
int i = 0;
if (!str) {
fprintf(stderr, "Not enough memory!");
return EXIT_FAILURE;
}
while (current!= NULL) {
char *name = malloc(sizeof(char) * MAX_ITEM_PRINT_LEN);
char *price = malloc(sizeof(char) * MAX_ITEM_PRINT_LEN);
char *quantity = malloc(sizeof(char) * MAX_ITEM_PRINT_LEN);
if (!name ||!price ||!quantity) {
fprintf(stderr, "Not enough memory!");
return EXIT_FAILURE;
}
sprintf(name, "%s", current->item_name);
sprintf(price, "%.2f", current->price);
sprintf(quantity, "%d", current->quantity);
char *toPrint = malloc(sizeof(char) * MAX_ITEM_PRINT_LEN);
if (!toPrint) {
fprintf(stderr, "Not enough memory!");
return EXIT_FAILURE;
}
strcat(toPrint, quantity);
strcat(toPrint, " * ");
strcat(toPrint, name);
strcat(toPrint, " @ $");
strcat(toPrint, price);
strcat(toPrint, " ea");
strcat(str, toPrint);
strcat(str, "\n");
free(toPrint);
current = current->next;
}
printf("%s", str);
free(str);
return EXIT_SUCCESS;
}
// add a new item (name, price, quantity) to the list at position pos,
// such that the added item is the item at position pos
// For example:
// If the list is:
// 1: 3 * banana @ $1.00 ea
// 2: 2 * orange @ $2.00 ea
// and you call list_add_item_at_pos(&head, "apple", 3.0, 4, 2)
// the list should be:
// 1: 3 * banana @ $1.00 ea
// 2: 4 * apple @ $3.00 ea
// 3: 2 * orange @ $2.00 ea
int list_add_item_at_pos(node **head, char *item_name, float price, int quantity, unsigned int pos) {
if (*head == NULL) {
list_init(head);
}
node *current = *head;
unsigned int i = 0;
while (current!= NULL) {
if (i == pos - 1) {
node *new = malloc(sizeof(node));
if (!new) {
fprintf(stderr, "Not enough memory!");
return EXIT_FAILURE;
}
new->item_name = malloc(sizeof(char) * strlen(item_name));
if (!new->item_name) {
fprintf(stderr, "Not enough memory!");
return EXIT_FAILURE;
}
strcpy(new->item_name, item_name);
new->price = price;
new->quantity = quantity;
new->next = current->next;
current->next = new;
break;
}
current = current->next;
i++;
}
return EXIT_SUCCESS;
}
// update the item at position pos
int list_update_item_at_pos(node **head, char *item_name, float price, int quantity, unsigned int pos) {
if (*head == NULL) {
fprintf(stderr, "Empty list!");
return EXIT_FAILURE;
}
node *current = *head;
unsigned int i = 0;
while (current!= NULL) {
if (i == pos - 1) {
current->item_name = malloc(sizeof(char) * strlen(item_name));
strcpy(current->item_name, item_name);
current->price = price;
current->quantity = quantity;
break;
}
current = current->next;
i++;
}
return EXIT_SUCCESS;
}
// remove the item at position pos
int list_remove_item_at_pos(node **head, int pos) {
if (*head == NULL) {
fprintf(stderr, "Empty list!");
return EXIT_FAILURE;
}
node *current = *head;
unsigned int i = 0;
while (current!= NULL) {
if (i == pos - 1) {
node *next = current->next;
free(current);
current = next;
break;
}
current = current->next;
i++;
}
return EXIT_SUCCESS;
}
// swap the item at position pos1 with the item at position pos2
int list_swap_item_positions(node **head, int pos1, int pos2) {
if (*head == NULL) {
fprintf(stderr, "Empty list!");
return EXIT_FAILURE;
}
node *current = *head;
node *pos1_node = NULL;
node *pos2_node = NULL;
unsigned int i = 0;
while (current!= NULL) {
if (i == pos1 - 1) {
pos1_node = current;
}
if (i == pos2 - 1) {
pos2_node = current;
}
current = current->next;
i++;
}
if (pos1_node == NULL || pos2_node == NULL) {
fprintf(stderr, "No such positions!");
return EXIT_FAILURE;
}
node *temp = pos1_node->next;
pos1_node->next = pos2_node->next;
pos2_node->next = temp;
if (pos1 == 1) {
*head = pos2_node;
} else if (pos2 == 1) {
*head = pos1_node;
}
return EXIT_SUCCESS;
}
// find the item position with the highest single price
int list_find_highest_price_item_position(node *head, int *pos) {
if (head == NULL) {
fprintf(stderr, "empty list");
return EXIT_FAILURE;
}
node *current = head->next;
node *max = current;
int i = 0;
while (current!= NULL) {
if (current->price > max->price) {
max = current;
}
current = current->next;
i++;
}
*pos = i;
return EXIT_SUCCESS;
}
// calculate the total cost of the list (sum of all prices * quantities)
int list_cost_sum(node *head, float *total) {
if (head == NULL) {
fprintf(stderr, "empty list");
return EXIT_FAILURE;
}
node *current = head->next;
float sum = 0.0;
while (current!= NULL) {
sum += current->price * current->quantity;
current = current->next;
}
*total = sum;
return EXIT_SUCCESS;
}
// save the list to file filename
// the file should be in the following format:
// item_name,price,quantity\n
// (one item per line, separated by commas, and newline at the end)
int list_save(node *head, char *filename) {
if (head == NULL) {
fprintf(stderr, "Empty list!");
return EXIT_FAILURE;
}
FILE *file = fopen(filename, "w");
if (!file) {
fprintf(stderr, "Couldn't open file!");
return EXIT_FAILURE;
}
char *str = malloc(sizeof(char) * MAX_ITEM_PRINT_LEN);
if (!str) {
fprintf(stderr, "Not enough memory!");
return EXIT_FAILURE;
}
node *current = head->next;
while (current!= NULL) {
sprintf(str, "%s,%.2f,%d\n", current->item_name, current->price, current->quantity);
fputs(str, file);
current = current->next;
}
fclose(file);
return EXIT_SUCCESS;
}
// load the list from file filename
// the file should be in the following format:
// item_name,price,quantity\n
// (one item per line, separated by commas, and newline at the end)
// the loaded values are added to the end of the list
int list_load(node **head, char *filename) {
if (*head == NULL) {
list_init(head);
}
node *current = *head;
FILE *file = fopen(filename, "r");
if (!file) {
fprintf(stderr, "Couldn't open file!");
return EXIT_FAILURE;
}
char *line = malloc(sizeof(char) * MAX_ITEM_PRINT_LEN);
if (!line) {
fprintf(stderr, "Not enough memory!");
return EXIT_FAILURE;
}
while (fgets(line, MAX_ITEM_PRINT_LEN, file)!= NULL) {
node *new = malloc(sizeof(node));
if (!new) {
fprintf(stderr, "Not enough memory!");
return EXIT_FAILURE;
}
char *token[3];
int i = 0;
char *next = line;
while (next[i]!= '\n') {
token[i] = next;
i++;
next = next + 1;
}
token[i] = next;
i++;
new->item_name = malloc(sizeof(char) * (strlen(token[0]) - 1));
if (!new->item_name) {
fprintf(stderr, "Not enough memory!");
return EXIT_FAILURE;
}
strcpy(new->item_name, token[0]);
new->price = strtod(token[1], NULL);
new->quantity = atoi(token[2]);
new->next = NULL;
current->next = new;
current = new;
}
fclose(file);
return EXIT_SUCCESS;
}
// de-duplicate the list by combining items with the same name
// by adding their quantities
// The order of the returned list is undefined and may be in any order
int list_deduplicate(node **head) {
if (*head == NULL) {
fprintf(stderr, "Empty list!");
return EXIT_FAILURE;
}
node *current = *head;
node *next = current->next;
node *toFree = current;
while (next!= NULL) {
node *current2 = next->next;
while (current2!= NULL) {
if (!strcmp(current->item_name, current2->item_name)) {
current->quantity += current2->quantity;
current->price += current2->price;
current2 = current2->next;
toFree = toFree->next;
free(toFree);
} else {
current = current->next;
}
}
next = next->next;
}
*head = current;
return EXIT_SUCCESS;
}