add linkstack

stack/linkstack.c

+#include <stdio.h>
+#include <stdlib.h>
+#include "linkstack.h"
+
+linkstack_t pkt_creat_linkstack(void)
+{
+    linkstack_t s ;
+    if ((s = (linkstack_t)malloc(sizeof(struct linkstack))) == NULL)
+    {
+        printf("malloc failed!\n");
+        return NULL;
+    }
+
+    s->next = NULL;
+    return s;
+}
+
+int pkt_empty_linkstack(linkstack_t s)
+{
+    return s->next == NULL;
+}
+
+stack_frame_t pkt_get_linkstack_top(linkstack_t s)
+{
+    if (pkt_empty_linkstack(s))
+    {
+        printf("linkstack is empty!\n");
+        return NULL;
+    }
+
+    return &s->next->frame;
+}
+
+int pkt_linkstack_push(linkstack_t s, stack_frame_t frame)
+{
+    PKT_ASSERT(s);
+    PKT_ASSERT(frame);
+    linkstack_t f;
+    if ((f = (linkstack_t)malloc(sizeof(struct linkstack))) == NULL)
+    {
+        printf("malloc failed!\n");
+        return -1;
+    }
+    f->frame = *frame;
+    f->next = s->next;
+    s->next = f;
+    return 0;
+}
+
+struct stack_frame pkt_linkstack_pop(linkstack_t s)
+{
+    struct stack_frame f = {0};
+
+    if (pkt_empty_linkstack(s))
+    {
+        printf("linkstack is empty!\n");
+        return f;
+    }
+    
+    linkstack_t d = s->next;
+    s->next = d->next;
+    f = d->frame;
+    free(d);
+    return f;
+}
+
+int pkt_clear_linkstack(linkstack_t s)
+{
+    linkstack_t d = s->next;
+    while (d)
+    {
+        s->next = d->next;
+        free(d);
+        d = s->next;
+    }
+    return 0;
+}
+
+int pkt_free_linkstack(linkstack_t s) /* include free head */
+{
+    linkstack_t d = s;
+
+    while (d)
+    {
+        s = d->next;
+        free(d);
+        d = s;
+    }
+    return 0;
+}
+
+
+int main(void)
+{
+    linkstack_t s = pkt_creat_linkstack();
+
+    struct stack_frame frame;
+
+    for (int i = 0; i < 10; i++)
+    {
+        frame.data = i;
+        pkt_linkstack_push(s, &frame);
+    }
+
+    while (!pkt_empty_linkstack(s))
+    {
+        printf("%d\n", pkt_linkstack_pop(s).data);
+    }
+    pkt_free_linkstack(s);
+    return 0;
+}
+

stack/linkstack.h

+#ifndef _LINKSTACK_H_
+#define _LINKSTACK_H_
+
+#define PKT_ASSERT(x) {if((x) == NULL){printf("assert failed!\n"); while(1);}}
+
+
+struct stack_frame
+{
+    int data;
+};
+typedef struct stack_frame *stack_frame_t;
+
+typedef struct linkstack *linkstack_t;
+struct linkstack
+{
+    struct stack_frame frame;
+    linkstack_t next;
+};
+
+
+#endif