From 586a95dde36c1d4f1dfd2b7590db87f6d9d55d12 Mon Sep 17 00:00:00 2001
From: "@syxhe" <https://t.me/syxhe>
Date: Mon, 24 Mar 2025 15:53:14 -0500
Subject: Do some more work on the linked list

---
 src/ll.c | 75 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++--------
 1 file changed, 66 insertions(+), 9 deletions(-)

(limited to 'src/ll.c')

diff --git a/src/ll.c b/src/ll.c
index ae62e89..4819226 100644
--- a/src/ll.c
+++ b/src/ll.c
@@ -47,17 +47,26 @@ int dllnode_free(dllnode **n) {
     return 0;
 }
 
-void dlinkedlist_init(dlinkedlist **ll) {
-    (*ll) = xcalloc(1, sizeof(**ll));
+dlinkedlist * dlinkedlist_init(void) {
+    dlinkedlist *ll = xcalloc(1, sizeof(*ll));
     
-    (*ll)->start = NULL;
-    (*ll)->end = NULL;
-    (*ll)->size = 0;
+    ll->start = NULL;
+    ll->end = NULL;
+    ll->size = 0;
 
-    return;
+    return ll;
 }
 
-void dlinkedlist_free(dlinkedlist **ll) {
+int dlinkedlist_free(dlinkedlist **ll) {
+    if(!ll) {
+        errno = EINVAL;
+        return -1;
+    }
+    if(!(*ll)) {
+        errno = EINVAL;
+        return -1;
+    }
+
     dllnode *p = (*ll)->start, *n;
     while(p != NULL) {
         n = p->next;
@@ -67,7 +76,7 @@ void dlinkedlist_free(dlinkedlist **ll) {
 
     free(*ll);
     (*ll) = NULL;
-    return;
+    return 0;
 }
 
 int dlinkedlist_firstitem(dlinkedlist * const ll, void *data, dlinkedlist_freecallback dfreecb) {
@@ -210,4 +219,52 @@ int dlinkedlist_remove(dlinkedlist * const ll, size_t index) {
     ll->size--;
 
     return 0;
-}
\ No newline at end of file
+}
+
+size_t dlinkedlist_size(const dlinkedlist * const ll) {
+    if(!ll)
+        RETURNWERR(EINVAL, -1);
+
+    return ll->size;
+}
+
+int dlinkedlist_isempty(const dlinkedlist * const ll) {
+    if(!ll)
+        RETURNWERR(EINVAL, -1);
+
+    return (ll->size == 0);
+}
+
+
+
+
+// Sample code
+#define COMPILE_SAMPLE
+#ifdef COMPILE_SAMPLE
+
+#include <stdio.h>
+#include <string.h>
+
+int genfree(void *data) {
+    free(data);
+    return 0;
+}
+
+int main() {
+    dlinkedlist *dll = dlinkedlist_init();
+    dlinkedlist_append(dll, (void*)strdup("THIS"),      genfree);
+    dlinkedlist_append(dll, (void*)strdup("IS"),        genfree);
+    dlinkedlist_append(dll, (void*)strdup("A"),         genfree);
+    dlinkedlist_append(dll, (void*)strdup("STRING"),    genfree);
+
+    // This is crashing as of right now
+    char *retval;
+    for(int i = 0; i < dlinkedlist_size(dll); i++)
+        printf("%s ", (((retval = (char*)dlinkedlist_get(dll, i)) != NULL) ? retval : "null") );
+    printf("\n");
+
+    dlinkedlist_free(&dll);
+
+    return 0;
+}
+#endif
\ No newline at end of file
-- 
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