init commit

3sem/cnts/contest3/05.c

@@ -0,0 +1,45 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <limits.h>
+
+enum
+{
+    CHAR_IN_INT = 12
+};
+
+struct Elem
+{
+    struct Elem *next;
+    char *str;
+};
+
+struct Elem *
+dup_elem(struct Elem *head)
+{
+    if (head == NULL) {
+        return NULL;
+    }
+
+    head->next = dup_elem(head->next);
+
+    errno = 0;
+    char *p;
+    long n = strtol(head->str, &p, 10);
+    if (errno || (int) n != n || n == INT_MAX || *p || p == head->str) {
+        return head;
+    }
+
+    struct Elem *new = calloc(1, sizeof(*new));
+    if (new == NULL) {
+        exit(1);
+    }
+
+    char *str = calloc(CHAR_IN_INT, sizeof(*str));
+    snprintf(str, CHAR_IN_INT, "%d", (int) n + 1);
+
+    new->str = str;
+    new->next = head;
+
+    return new;
+}