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implement singly linked lists with partial tests
1 parent 4aaac51 commit 88dbee4

7 files changed

Lines changed: 458 additions & 1 deletion

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‎.bazelrc‎

Lines changed: 1 addition & 1 deletion
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@@ -7,4 +7,4 @@ run --action_env=HOME
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# --- Output Formatting ---
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# Make the output look nicer (optional but recommended)
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test --test_output=errors
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test --test_output=errors --test_verbose_timeout_warnings

‎c/includes/BUILD.bazel‎

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@@ -1,2 +1,3 @@
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exports_files(["greet.h"])
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exports_files(["vector.h"])
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exports_files(["slinkedlist.h"])

‎c/includes/slinkedlist.h‎

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@@ -0,0 +1,24 @@
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#ifndef C_SLINKEDLIST_H
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#define C_SLINKEDLIST_H
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#include <stddef.h>
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typedef struct SLinkedList SLinkedList;
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SLinkedList* slinkedlist_new();
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size_t slinkedlist_size(SLinkedList* list);
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short slinkedlist_empty(SLinkedList* list);
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void* slinkedlist_at(SLinkedList* list, int index);
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void slinkedlist_push_front(SLinkedList* list, const void* item);
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void* slinkedlist_pop_front(SLinkedList* list);
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void slinkedlist_push_back(SLinkedList* list, const void* item);
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void* slinkedlist_pop_back(SLinkedList* list);
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void* slinkedlist_front(SLinkedList* list);
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void* slinkedlist_back(SLinkedList* list);
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void slinkedlist_insert(SLinkedList* list, int index, const void* item);
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void slinkedlist_erase(SLinkedList* list, int index);
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void* slinkedlist_value_n_from_end(SLinkedList* list, int n);
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void slinkedlist_reverse(SLinkedList* list);
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void slinkedlist_remove_value(SLinkedList* list, const void* value);
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void slinkedlist_free(SLinkedList* list);
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#endif // C_SLINKEDLIST_H

‎c/src/linkedlist/BUILD.bazel‎

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@@ -0,0 +1,9 @@
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load("@rules_cc//cc:defs.bzl", "cc_library")
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cc_library(
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name = "slinkedlist",
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srcs = ["slinkedlist.c"],
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hdrs = ["//c/includes:slinkedlist.h"],
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strip_include_prefix = "//c",
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visibility = ["//visibility:public"],
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)

‎c/src/linkedlist/slinkedlist.c‎

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@@ -0,0 +1,259 @@
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#include "includes/slinkedlist.h"
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#include <stddef.h>
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#include <stdlib.h>
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#include <string.h>
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typedef struct SLinkedListNode {
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void* value;
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struct SLinkedListNode* next;
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} SLinkedListNode;
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struct SLinkedList {
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size_t size;
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SLinkedListNode* head;
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SLinkedListNode* tail;
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};
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SLinkedList* slinkedlist_new() {
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SLinkedList* list = malloc(sizeof(SLinkedList));
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if (list == NULL) return NULL;
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list->size = 0;
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list->head = NULL;
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list->tail = NULL;
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return list;
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}
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size_t slinkedlist_size(SLinkedList* list) { return list->size; }
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short slinkedlist_empty(SLinkedList* list) { return list->size == 0; }
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void* slinkedlist_at(SLinkedList* list, int index) {
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if (index < 0 || index >= list->size) return NULL;
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SLinkedListNode* node = list->head;
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int i = 0;
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while (node != NULL && i < index) {
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node = node->next;
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i++;
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}
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if (node == NULL) return NULL;
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return node->value;
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}
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void slinkedlist_push_front(SLinkedList* list, const void* item) {
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SLinkedListNode* node = malloc(sizeof(SLinkedListNode));
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if (node == NULL) return;
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node->value = (void*)item;
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node->next = list->head;
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if (list->head == NULL) {
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list->head = node;
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list->tail = node;
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} else {
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list->head = node;
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}
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list->size++;
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}
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void* slinkedlist_pop_front(SLinkedList* list) {
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if (list->head == NULL) return NULL;
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void* value = list->head->value;
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SLinkedListNode* next = list->head->next;
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free(list->head);
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list->head = next;
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if (list->head == NULL) list->tail = NULL;
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list->size--;
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return value;
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}
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void slinkedlist_push_back(SLinkedList* list, const void* item) {
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SLinkedListNode* node = malloc(sizeof(SLinkedListNode));
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if (node == NULL) return;
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node->value = (void*)item;
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node->next = NULL;
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if (list->tail == NULL) {
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list->head = node;
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list->tail = node;
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} else {
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list->tail->next = node;
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list->tail = node;
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}
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list->size++;
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}
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void* slinkedlist_pop_back(SLinkedList* list) {
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if (list->tail == NULL) return NULL;
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void* value = list->tail->value;
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if (list->head == list->tail) {
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free(list->head);
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list->head = NULL;
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list->tail = NULL;
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list->size--;
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return value;
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}
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SLinkedListNode* prev = list->head;
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while (prev->next != list->tail) {
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prev = prev->next;
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}
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free(list->tail);
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list->tail = prev;
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list->tail->next = NULL;
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list->size--;
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return value;
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}
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void* slinkedlist_front(SLinkedList* list) {
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if (list->head == NULL) return NULL;
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return list->head->value;
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}
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void* slinkedlist_back(SLinkedList* list) {
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if (list->tail == NULL) return NULL;
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return list->tail->value;
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}
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void slinkedlist_insert(SLinkedList* list, int index, const void* item) {
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if (index < 0 || index > list->size) return;
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if (index == 0) {
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slinkedlist_push_front(list, item);
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} else if (index == list->size) {
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slinkedlist_push_back(list, item);
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} else {
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SLinkedListNode* prev = list->head;
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int i = 0;
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while (prev != NULL && i < index - 1) {
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prev = prev->next;
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i++;
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}
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if (prev == NULL) return;
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SLinkedListNode* node = malloc(sizeof(SLinkedListNode));
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if (node == NULL) return;
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node->value = (void*)item;
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node->next = prev->next;
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prev->next = node;
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if (node->next == NULL) list->tail = node;
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list->size++;
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}
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}
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void slinkedlist_erase(SLinkedList* list, int index) {
168+
if (index < 0 || index >= list->size) return;
169+
170+
if (index == 0) {
171+
slinkedlist_pop_front(list);
172+
} else if (index == list->size - 1) {
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slinkedlist_pop_back(list);
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} else {
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SLinkedListNode* prev = list->head;
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int i = 0;
177+
while (prev != NULL && i < index - 1) {
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prev = prev->next;
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i++;
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}
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if (prev == NULL) return;
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SLinkedListNode* target = prev->next;
185+
if (target == NULL) return;
186+
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prev->next = target->next;
188+
if (target->next == NULL) list->tail = prev;
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free(target);
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list->size--;
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}
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}
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void* slinkedlist_value_n_from_end(SLinkedList* list, int n) {
196+
if (n < 0 || n >= list->size) return NULL;
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SLinkedListNode* first = list->head;
199+
int i = 0;
200+
while (first != NULL && i < list->size - n - 1) {
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first = first->next;
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i++;
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}
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if (first == NULL) return NULL;
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return first->value;
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}
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void slinkedlist_reverse(SLinkedList* list) {
211+
if (list->head == NULL || list->head->next == NULL) {
212+
return;
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}
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SLinkedListNode* new_tail = list->head;
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SLinkedListNode* prev = NULL;
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SLinkedListNode* current = list->head;
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SLinkedListNode* next = NULL;
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while (current != NULL) {
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next = current->next;
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current->next = prev;
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prev = current;
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current = next;
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}
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list->head = prev;
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list->tail = new_tail;
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}
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void slinkedlist_remove_value(SLinkedList* list, const void* value) {
232+
SLinkedListNode* prev = NULL;
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SLinkedListNode* current = list->head;
234+
while (current != NULL && current->value != value) {
235+
prev = current;
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current = current->next;
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}
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if (current == NULL) return;
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if (prev == NULL) {
242+
slinkedlist_pop_front(list);
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} else {
244+
prev->next = current->next;
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if (current->next == NULL) list->tail = prev;
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free(current);
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list->size--;
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}
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}
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void slinkedlist_free(SLinkedList* list) {
252+
SLinkedListNode* current = list->head;
253+
while (current != NULL) {
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SLinkedListNode* next = current->next;
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free(current);
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current = next;
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}
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free(list);
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}

‎c/tests/BUILD.bazel‎

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Original file line numberDiff line numberDiff line change
@@ -17,3 +17,12 @@ cc_test(
1717
"@googletest//:gtest_main",
1818
],
1919
)
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cc_test(
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name = "slinkedlist_test",
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srcs = ["slinkedlist_test.cc"],
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deps = [
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"//c/src/linkedlist:slinkedlist",
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"@googletest//:gtest_main",
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],
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)

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