made popping with lists work. yay! (also new demo to show the thing)

README.md

@@ -39,6 +39,7 @@ I got bored with having to use complicated checking and stuff when working with
 + Creating a list
 + Pushing into a list
 + Printing a list
++ Popping the last value of a list
 + Cleanup of a list
 
 #### TODO:
@@ -46,7 +47,6 @@ I got bored with having to use complicated checking and stuff when working with
 + Inserting at a given index
 + Verify multi-dimensional lists working
 + Get/set at a given index
-+ Popping
 + Remove at a given index
 + Verify vectors working inside of lists
 

demo.c

@@ -1,4 +1,5 @@
 #include <odweta/list.h>
+#include <stdio.h>
 
 int main(int argc, char **argv) {
 	list_t *l = listInit();
@@ -9,6 +10,27 @@ int main(int argc, char **argv) {
 
 	listPrint(l);
 
+	printf("popping for the 1st time\n");
+	int popped = *((int *)listPop(l));
+
+	printf("popped: %d\n", popped);
+
+	listPrint(l);
+
+	printf("popping for the 2nd time\n");
+	char cpopped = *((char *)listPop(l));
+
+	printf("popped: '%c'\n", cpopped);
+
+	listPrint(l);
+
+	printf("popping for the 3rd time\n");
+	float fpopped = *((float *)listPop(l));
+
+	printf("popped: %f\n", fpopped);
+
+	listPrint(l);
+
 	listCleanup(l);
 
 	return 0;

include/list.h

@@ -17,10 +17,12 @@ typedef struct {
     vector_t* data;         // vector of vectors
 } list_t;
 
-list_t* listInit();                         // returns a new list
+list_t* listInit();                                             // returns a new list
 
-void listPush(list_t* l, dataType_e type, void* element);    // appends an element at the end of a list
+void listPush(list_t* l, dataType_e type, void* element);       // appends an element at the end of a list
 
-void listPrint(list_t* l);                  // prints a list
+void listPrint(list_t* l);                                      // prints a list
 
-void listCleanup(list_t* l);                         // freeing pointers
+void listCleanup(list_t* l);                                    // freeing pointers
+
+void* listPop(list_t* l);                                       // popping the last value of the list and returning it

src/list.c

@@ -106,3 +106,15 @@ listCleanup(list_t* l) {
     vectorCleanup((vector_t *)l->data);
     free(l);
 }
+
+void*
+listPop(list_t* l) {
+    vector_t *first_ptr = (vector_t *)vectorPop((vector_t *)l->data);
+    void *ptr = vectorPop(first_ptr);
+    l->size -= 1;
+
+    if (l->size <= l->capacity / 2) l->capacity /= 2;
+    if (l->capacity == 0) l->capacity = 1;
+
+    return ptr;
+}

src/vector.c

@@ -216,30 +216,27 @@ vectorPop(vector_t* v) {
             int *iretval = (int *)(v->data) + v->size-1;
             v->size -= 1;
             if (v->size <= v->capacity / 2) v->capacity /= 2;
-            v->data = realloc(v->data, v->elementSize * v->capacity);
-        if (v->capacity == 0) v->capacity = 1;
-        return iretval;
+            if (v->capacity == 0) v->capacity = 1;
+            return iretval;
         case FLOAT:
             float *fretval = (float *)(v->data) + v->size-1;
             v->size -= 1;
             if (v->size <= v->capacity / 2) v->capacity /= 2;
             if (v->capacity == 0) v->capacity = 1;
-            v->data = realloc(v->data, v->elementSize * v->capacity);
-        return fretval;
+            return fretval;
         case CHAR:
             char *cretval = (char *)(v->data) + v->size-1;
             v->size -= 1;
             if (v->size <= v->capacity / 2) v->capacity /= 2;
             if (v->capacity == 0) v->capacity = 1;
-            v->data = realloc(v->data, v->elementSize * v->capacity);
-        return cretval;
+            return cretval;
         case VECTOR:
             vector_t *vretval = (vector_t *)(v->data) + v->size-1;
             v->size -= 1;
             if (v->size <= v->capacity / 2) v->capacity /= 2;
             if (v->capacity == 0) v->capacity = 1;
-            v->data = realloc(v->data, v->elementSize * v->capacity);
-        return vretval;
+
+            return vretval;
         default:
             perror("specify a valid vector type\n");
             exit(EXIT_FAILURE);