feat: Initial commit

Laboratorio 7/Esercizio 2/Diagonali.c

@@ -0,0 +1,73 @@
+// Laboratorio 7 - Esercizio 2 - Diagonali.c
+// Matteo Schiff - s295565
+
+#include <stdlib.h>
+#include "Elementi.h"
+#include "Diagonali.h"
+
+typedef struct node_s *link;
+
+typedef struct node_s {
+    Diagonale diag;
+    link next;
+} node;
+
+typedef struct diagonali
+{
+    link head;
+    int N;
+} *Diagonali;
+
+link new_node(Diagonale diag, link next) {
+    link t = malloc(sizeof(node));
+    if (t == NULL) {
+        printf("Errore: impossibile allocare memoria");
+        exit(2);
+    }
+    t->diag = diag;
+    t->next = next;
+
+    return t;
+}
+
+void free_node(link p) {
+    free(p);
+}
+
+/* creatore e distruttore */
+Diagonali DiagionaliInit() {
+    Diagonali new = malloc(sizeof(struct diagonali));
+    new->head = NULL;
+    new->N = 0;
+    return new;
+}
+
+void DiagonaliFree(Diagonali diags) {
+    link p, x;
+    for (p = diags->head, x = diags->head->next; x != NULL; p = x, x = x->next){
+        free_node(p);
+    }
+    free(diags);
+}
+
+void DiagonaliInsert(Diagonali diags, Diagonale newDiag) {
+    link nd = new_node(newDiag, diags->head);
+    diags->head = nd;
+    diags->N++;
+} 
+
+link DiagonaliTraverse(Diagonali diags, link prev, Diagonale ** elem) {
+    link next;
+
+    if (prev == NULL) {
+        next = diags->head;
+    } else {
+        next = prev->next;
+    }
+
+    if (next == NULL)
+        return NULL;
+
+    *elem = &next->diag;
+    return next;
+}