source: doc/papers/general/evaluation/c-stack.c@ a9b1b0c

#include <stdlib.h>
#include "c-stack.h"

struct stack_node {
        void * value;
        struct stack_node * next;
};

void clear_stack( struct stack * s, void (*free_el)( void * ) ) {
        for ( struct stack_node * next = s->head; next; ) {
                struct stack_node * crnt = next;
                next = crnt->next;
                free_el( crnt->value );
                free( crnt );
        }
        s->head = NULL;
}

struct stack new_stack() { return (struct stack){ NULL }; /***/ }

void copy_stack( struct stack * s, const struct stack * t, void * (*copy)( const void * ) ) {
        struct stack_node ** crnt = &s->head;
        for ( struct stack_node * next = t->head; next; next = next->next ) {
                *crnt = malloc( sizeof(struct stack_node) ); /***/
                (*crnt)->value = copy( next->value );
                crnt = &(*crnt)->next;
        }
        *crnt = NULL;
}
struct stack * assign_stack( struct stack * s, const struct stack * t, 
                void * (*copy_el)( const void * ), void (*free_el)( void * ) ) {
        if ( s->head == t->head ) return s;
        clear_stack( s, free_el ); /***/
        copy_stack( s, t, copy_el ); /***/
        return s;
}

_Bool stack_empty( const struct stack * s ) { return s->head == NULL; }

void push_stack( struct stack * s, void * v ) {
        struct stack_node * n = malloc( sizeof(struct stack_node) ); /***/
        *n = (struct stack_node){ v, s->head }; /***/
        s->head = n;
}

void * pop_stack( struct stack * s ) {
        struct stack_node * n = s->head;
        s->head = n->next;
        void * v = n->value;
        free( n );
        return v;
}