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lifo.c
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lifo.c
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#include "lifo.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
struct item* sp = NULL;
struct buffer* ms = NULL;
void lifo_init()
{
ms = buffer_new();
}
void lifo_free()
{
free(ms);
ms = NULL;
}
struct buffer* push( unsigned long long ts )
{
struct item* p = malloc( 1 * sizeof *sp );
if( NULL == p )
{
fprintf(stderr, "malloc() failed\n");
return ms;
}
p->timestamp = ts;
p->next = NULL;
if( NULL == ms )
{
fprintf(stderr, "Stack not initialized ?\n");
free(p);
return ms;
}
else if( NULL == ms->head )
{
ms->head = p;
return ms;
}
else
{
p->next = ms->head;
ms->head = p;
}
return ms;
}
struct buffer* pop( )
{
struct item* p = NULL;
if( NULL == ms )
{
printf("Buffer not yet initialized\n");
}
else if( NULL == ms->head )
{
printf("No element in buffer\n");
}
else
{
p = ms->head;
ms->head = ms->head->next;
free(p);
}
return ms;
}
unsigned long long popts( ) { /* same as pop() but returns the item value */
unsigned long long ts;
struct item* p = NULL;
if( NULL == ms )
{
printf("Buffer not yet initialized\n");
}
else if( NULL == ms->head )
{
printf("No element in buffer\n");
}
else
{
p = ms->head;
ms->head = ms->head->next;
ts = p->timestamp;
free(p);
}
return ts;
}
struct item* top( struct buffer* s)
{
if( NULL == s )
{
printf("Buffer not yet initalized\n");
return NULL;
}
else if( NULL == s->head )
{
printf("No element in buffer\n");
}
return s->head;
}
struct item* make_null( struct buffer* s )
{
if( NULL == s )
{
printf("Buffer not initialized (cannot make null)\n");
return NULL;
}
else if( NULL == s->head )
{
printf("Buffer already Empty\n");
}
else
{
buffer_free(s);
}
return s->head;
}
struct item* is_empty( struct buffer* s )
{
if( NULL == s )
{
printf("Buffer not initialized\n");
return NULL;
}
else if( NULL == s->head )
{
printf("Buffer is Empty\n");
}
else
{
printf("Buffer is not Empty\n");
}
return s->head;
}
struct buffer* buffer_free( struct buffer* s )
{
if( NULL == s )
{
printf("Cannot free uninitialized buffer\n");
}
while( s->head ) {
pop(s);
}
return s;
}
struct buffer* buffer_new( void )
{
struct buffer* p = malloc(sizeof(sp));
if( NULL == p )
{
fprintf(stderr, "malloc() init failed!\n");
exit(1);
}
p->head = NULL;
return p;
}
void buffer_print( )
{
struct item* p = NULL;
if( NULL == ms )
{
printf("Can not print an Empty Stack\n");
}
else
{
for( p = ms->head; p; p = p->next ) {
buffer_print_item(p);
}
}
}
void buffer_print_item(const struct item* s) /* you need to adjust this for your datatype (struct item) */
{
if( s ) printf("timestamp = %llu\n", s->timestamp);
}