this is a big fix, not a small fix

common/linkedlist.c

@@ -52,9 +52,13 @@ int adll_remove(dllda *whatif, nodeld *node)
     {
         // start = right
         whatif->start = node->next;
+
+        if (whatif->start == whatif->end)
+            whatif->end = NULL; // ass font
+
         // left of right now is null
-        whatif->start->prev = NULL;
+        if (whatif->start != NULL)
-        // eq to line below
+            whatif->start->prev = NULL;
     }
     // no right!
     else if (node->next == NULL || node == whatif->end) // b
@@ -62,8 +66,8 @@ int adll_remove(dllda *whatif, nodeld *node)
         // end is now left
         whatif->end = node->prev;
         // right of left now is null
-        whatif->end->next = NULL;
+        if (whatif->end != NULL)
-        // eq to line below too like
+            whatif->end->next = NULL;
     }
 
     whatif->size--;
@@ -231,6 +235,11 @@ int dllda_popleft(dllda *l, uintptr_t *puthere)
     };
     *puthere = startMayBeNull->ptr;
     adll_remove(l, startMayBeNull);
+    if (dllda_len(l) == 1)
+    {
+        if (l->start == NULL)
+            ;
+    };
     return 0;
 }
 
@@ -304,10 +313,10 @@ void printItOut(dllda *new)
     printf("size: %d [", sz);
     uintptr_t *c = (uintptr_t *)calloc(sz, sizeof(uintptr_t));
     for (int i = sz - dllda_to_list(new, c);
-         printf("(%d: %d)", i, *(int *)c[i]) &&
+         (i < sz); // how to get value
-         (++i < sz); // how to get value
+         i++,
-         printf(", "))
+             (i < sz) && printf(", "))
-        ;
+        printf("(%d: %d)", i, *(int *)c[i]);
     printf("]\n");
 }
 void traverse(dllda *l)
@@ -348,7 +357,30 @@ int dllda_to_list(dllda *l, uintptr_t *arr)
     return len;
 }
 
-int _main(int argc, char const *argv[])
+int dllda_into_list(dllda *l, uintptr_t *arr)
+{
+    int len = dllda_len(l);
+    for (int i = 0; i < len; i++)
+    {
+        uintptr_t *t = &(arr[i]);
+        dllda_popleft(l, t);
+        // printf("%d ", *(int*) *t);
+    }
+    return len;
+}
+
+int dllda_from_list(dllda *l, uintptr_t *arr, int size)
+{
+    for (int i = 0; i < size; i++)
+    
+        // printf("%p %d ", arr[i], *(int *)arr[i]);
+        dllda_push(l, arr[i]);
+        // printf("%d ", *(int*) *t);
+    
+    return 0;
+}
+
+int main(int argc, char const *argv[])
 {
     dllda *new = initlda();
     int dsa = 17;
@@ -378,18 +410,40 @@ int _main(int argc, char const *argv[])
     dllda_insert(new, 0, (uintptr_t)&item6);
     // printItOut(new);
     // traverse(new);
-    uintptr_t this;
+    uintptr_t this1, this2, this3;
     int code;
-    code = dllda_rem(new, 3, &this);
+    code = dllda_rem(new, 3, &this1);
-    printf(" %d ", *(int *)this);
+    printf(" %d ", *(int *)this1);
     // printItOut(new);
-    code = dllda_popleft(new, &this);
+    code = dllda_popleft(new, &this2);
-    printf(" %d ", *(int *)this);
+    printf(" %d ", *(int *)this2);
     // printItOut(new);
-    code = dllda_pop(new, &this);
+    code = dllda_pop(new, &this3);
-    printf(" %d ", *(int *)this);
+    printf(" %d ", *(int *)this3);
     // printItOut(new);
     // traverse(new);
+    printf("\n");
+    int item7 = 11;
+    dllda_insert(new, 2, (uintptr_t)&item7);
+    int item8 = 42;
+    dllda_insert(new, 1, (uintptr_t)&item8);
+    int item9 = 16;
+    dllda_insert(new, 3, (uintptr_t)&item9);
+    dllda_push(new, this1);
+    dllda_push(new, this2);
+    dllda_pushleft(new, this3);
+    printItOut(new);
+    printf("\n");
+    int len = dllda_len(new);
+    uintptr_t *list = calloc(len, sizeof(uintptr_t));
+    dllda_into_list(new, list);
+    for (int i = 0; i < len; i++)
+        printf("%d ", *(int *)list[i]);
+    printf("\n");
+    printItOut(new);
+    printf("a\n");
+    dllda_from_list(new, list, len);
+    printItOut(new);
 
     return 0;
 }

specials/binary_search.c

@@ -0,0 +1,25 @@
+// feed in a pointer to a function that takes 2 and returns (just like the )
+#include <stdlib.h>
+#include <stdio.h>
+
+int cmpfunc(const void *a, const void *b)
+{
+    const int *A = a, *B = b;
+    return (*A > *B) - (*A < *B);
+}
+
+int main(int argc, char const *argv[])
+{
+    int a[13] = {1, 2, 3, 7, 3, 9, 11, 13, 42, -1, 4, 52, 10};
+    qsort(a, 13, sizeof(int), cmpfunc);
+    for (int i = 0; i < 13; i++)
+        printf("%d ", a[i]);
+        printf("\n");
+    int at = 5;
+    int *here = (int *)bsearch(&at, a, 13, sizeof(int), cmpfunc);
+    if (here == NULL)
+        printf("no %d ", at);
+    else
+        printf("is %d ", *here);
+    return 0;
+}