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100%Mean logprob: -0.37704076392886504 (68.59%)
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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 = 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) {
return EXIT_FAILURE;
}
int ret = snprintf(str, MAX_ITEM_PRINT_LEN, "%d * %s @ $%.2f ea",
head->quantity, head->item_name, head->price);
if (ret >= MAX_ITEM_PRINT_LEN) {
return EXIT_FAILURE;
}
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) {
return EXIT_FAILURE;
}
int pos = 1;
while (head) {
char buf[MAX_ITEM_PRINT_LEN];
list_item_to_string(head, buf);
printf("%d: %s\n", pos, buf);
head = head->next;
pos++;
}
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 || pos == 0) {
return EXIT_FAILURE;
}
node *new_node = (node *)malloc(sizeof(node));
new_node->item_name = malloc(strlen(item_name) + 1);
strcpy(new_node->item_name, item_name);
new_node->price = price;
new_node->quantity = quantity;
new_node->next = NULL;
int cur_pos = 1;
node *cur = *head;
while (cur->next && cur_pos < pos-1) {
cur = cur->next;
cur_pos++;
}
if (cur_pos == pos-1) {
new_node->next = cur->next;
cur->next = new_node;
} else {
free(new_node);
return EXIT_FAILURE;
}
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 || pos == 0) {
return EXIT_FAILURE;
}
int cur_pos = 1;
node *cur = *head;
while (cur->next && cur_pos < pos) {
cur = cur->next;
cur_pos++;
}
if (cur_pos == pos) {
free(cur->item_name);
cur->item_name = malloc(strlen(item_name) + 1);
strcpy(cur->item_name, item_name);
cur->price = price;
cur->quantity = quantity;
} else {
return EXIT_FAILURE;
}
return EXIT_SUCCESS;
}
// remove the item at position pos
int list_remove_item_at_pos(node **head, int pos) {
if (*head == NULL || pos == 0) {
return EXIT_FAILURE;
}
int cur_pos = 1;
node *cur = *head;
while (cur->next && cur_pos < pos-1) {
cur = cur->next;
cur_pos++;
}
if (cur_pos == pos-1) {
node *temp = cur->next;
cur->next = cur->next->next;
free(temp->item_name);
free(temp);
} else {
return EXIT_FAILURE;
}
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 || pos1 == 0 || pos2 == 0) {
return EXIT_FAILURE;
}
int cur_pos = 1;
node *cur = *head;
while (cur->next && cur_pos < pos1-1) {
cur = cur->next;
cur_pos++;
}
if (cur_pos == pos1-1) {
node *temp = cur->next;
cur->next = cur->next->next;
cur = cur->next;
cur_pos++;
while (cur->next && cur_pos < pos2-1) {
cur = cur->next;
cur_pos++;
}
if (cur_pos == pos2-1) {
node *temp2 = cur->next;
cur->next = temp;
temp->next = temp2->next;
free(temp2->item_name);
free(temp2);
} else {
return EXIT_FAILURE;
}
} else {
return EXIT_FAILURE;
}
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) {
*pos = 0;
return EXIT_FAILURE;
}
*pos = 1;
int cur_pos = 1;
float max_price = head->price;
node *cur = head->next;
while (cur) {
if (cur->price > max_price) {
*pos = cur_pos+1;
max_price = cur->price;
}
cur = cur->next;
cur_pos++;
}
return EXIT_SUCCESS;
}
// calculate the total cost of the list (sum of all prices * quantities)
int list_cost_sum(node *head, float *total) {
*total = 0;
if (head == NULL) {
return EXIT_FAILURE;
}
while (head) {
*total += head->price * head->quantity;
head = head->next;
}
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) {
FILE *fp = fopen(filename, "w");
if (fp == NULL) {
return EXIT_FAILURE;
}
while (head) {
fprintf(fp, "%s,%f,%d\n", head->item_name, head->price, head->quantity);
head = head->next;
}
fclose(fp);
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) {
FILE *fp = fopen(filename, "r");
if (fp == NULL) {
return EXIT_FAILURE;
}
char *line = NULL;
size_t len = 0;
ssize_t read;
while ((read = getline(&line, &len, fp))!= -1) {
if (read <= 3) {
continue;
}
if (line[read-1] == '\n') {
line[read-1] = '\0';
}
char *token = strtok(line, ",");
char *item_name = malloc(strlen(token) + 1);
strcpy(item_name, token);
token = strtok(NULL, ",");
float price = atof(token);
token = strtok(NULL, ",");
int quantity = atoi(token);
if (*head == NULL) {
*head = (node *)malloc(sizeof(node));
(*head)->item_name = item_name;
(*head)->price = price;
(*head)->quantity = quantity;
(*head)->next = NULL;
} else {
node *cur = *head;
while (cur->next) {
cur = cur->next;
}
cur->next = (node *)malloc(sizeof(node));
cur->next->item_name = item_name;
cur->next->price = price;
cur->next->quantity = quantity;
cur->next->next = NULL;
}
}
fclose(fp);
if (line) {
free(line);
}
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) {
return EXIT_FAILURE;
}
node *cur = *head;
node *prev = cur;
while (cur->next) {
if (strcmp(cur->item_name, cur->next->item_name) == 0) {
cur->quantity += cur->next->quantity;
node *temp = cur->next;
cur->next = cur->next->next;
free(temp->item_name);
free(temp);
} else {
prev = cur;
cur = cur->next;
}
}
return EXIT_SUCCESS;
}