istack.c File Reference

implement istack member functions More...

#include "debugmalloc.h"
#include <stdlib.h>
#include "istack.h"
#include "logging.h"

Go to the source code of this file.

Functions
istack_ptr	istack_new ()
int	istack_empty (istack_ptr istack)
int	istack_push (istack_ptr istack, int val)
int	istack_pop (istack_ptr istack)
int	istack_top (istack_ptr istack, int def)
void	istack_free (istack_ptr istack)

Detailed Description

implement istack member functions

See istack.h if doxygen again refuses to show doc comments from there!

Definition in file istack.c.

Function Documentation

istack_empty()

int istack_empty

(

istack_ptr

istack

)

Definition at line 26 of file istack.c.

                                    {
    return (!istack->next);
};

References istack_el::next.

istack_free()

void istack_free

(

istack_ptr

istack

)

Definition at line 59 of file istack.c.

                                    {
    while (!istack_empty(istack)) istack_pop(istack);
    free(istack);
}

References istack_el::istack_empty(), and istack_el::istack_pop().

istack_new()

istack_ptr istack_new

(

)

Definition at line 15 of file istack.c.

                        {
    istack_ptr head = malloc(sizeof(istack_el));
    if (!head) {
        ERROR("Memory allocation error in istack_new()!\n");
        return NULL;
    }
    head->next = NULL;
    return head;
}

References ERROR, and istack_el::next.

istack_pop()

int istack_pop

(

istack_ptr

istack

)

Definition at line 44 of file istack.c.

                                  {
    if (istack_empty(istack)) return -1;
    istack_ptr elem = istack->next;
    istack->next = elem->next;
    free(elem);
    return 0;
}

References istack_el::istack_empty(), and istack_el::next.

istack_push()

int istack_push	(	istack_ptr	istack,
		int	val
	)

Definition at line 31 of file istack.c.

                                            {
    istack_ptr elem = malloc(sizeof(istack_el));
    if (!elem) {
        ERROR("Memory allocation error in istack_push()!\n");
        return -1;
    }
    elem->val = val;
    elem->next = istack->next;
    istack->next = elem;
    return 0;
}

References ERROR, istack_el::next, and istack_el::val.

istack_top()

int istack_top	(	istack_ptr	istack,
		int	def
	)

Definition at line 53 of file istack.c.

                                           {
    if (istack_empty(istack)) return def;
    return istack->next->val;
};

References istack_el::istack_empty(), and istack_el::next.