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chained_functions.c

@@ -0,0 +1,108 @@
+#include "chained_functions.h"
+#include <stdio.h>
+
+//for information purposes: mom== momentan ((;
+
+messdaten*
+insertFirst (messdaten* firstelem, messdaten* newelement)
+{
+  newelement->next = firstelem;
+  return newelement;
+}
+
+messdaten*
+insertLast (messdaten* firstelem, messdaten* newelement)
+{
+  messdaten * mom = firstelem;
+  while (mom->next != NULL)
+    {
+      mom = mom->next;
+    }
+  mom->next = newelement;
+  newelement->next = NULL;
+  return firstelem;
+}
+
+messdaten*
+insertPos (messdaten* firstelem, messdaten* newelement, int pos)
+{
+  pos--;
+  messdaten * mom = firstelem;
+  int n = 0;
+  while (mom->next != NULL)
+    {
+      if (n == pos)
+	{
+	  newelement->next = mom->next;
+	  mom->next = newelement;
+	  return firstelem;
+	}
+      n++;
+      mom = mom->next;
+
+    }
+  fprintf (stderr, "failed to allocate list element!!");
+  return firstelem;
+}
+
+messdaten*
+deleteFirst (messdaten* firstelem)
+{
+  messdaten * temp = firstelem;
+
+  temp = firstelem->next;
+  free (firstelem);
+  return temp;
+}
+
+messdaten*
+deleteLast (messdaten* firstelem)
+{
+  messdaten * mom = firstelem;
+  messdaten * temp = NULL;
+  while (mom->next != NULL)
+    {
+      temp = mom;
+      mom = mom->next;
+    }
+  free (temp->next);
+  temp->next = NULL;
+  return firstelem;
+}
+
+messdaten*
+deletePos (messdaten* firstelem, int pos)
+{
+  pos--;
+  messdaten * mom = firstelem;
+  messdaten * temp = NULL;
+  int n = 0;
+  while (mom->next != NULL)
+    {
+      if (n == pos)
+	{
+	  temp = mom->next;
+	  mom->next = mom->next->next;
+	  free (temp);
+	  return firstelem;
+	}
+      n++;
+      mom = mom->next;
+
+    }
+  printf ("failed to allocate list element!!");
+  return firstelem;
+}
+
+messdaten*
+deleteAll (messdaten* firstelem)
+{
+  messdaten * temp;
+  while (firstelem != NULL)
+    {
+      temp = firstelem;
+      firstelem = firstelem->next;
+      free (temp);
+    }
+  return firstelem;
+}