Revised tree

10 Jan 2011 I have to make some changes in tree.c and tree.h, so del_branch
can be implemented easily!

Code:

tree.h

#ifndef GKO_TREE_H
#define GKO_TREE_H

#include "stack.h"
#include "common.h"

struct branch {
    char *name;
    char *data;
    struct branch *cont;
    struct branch *next;
} branch;
    

void init_tree (struct branch *,  char *,  char *) ;
void set_branch (struct branch *,  char *,  char *);
struct branch * get_branch (struct branch *,  char *);
void del_branch (struct branch *);

#endif

tree.c

#include "tree.h"

/* Initialize a Tree, set the root node */
void
init_tree (struct branch *t, char *name, char *data) 
{
    cpystr (&t->name, name);
    cpystr (&t->data, data);
    t->cont = NULL;
    t->next = NULL;
}

/* Create a new struct branch or edit an existent one */
void
set_branch (struct branch *t, char *name, char *data)
{
    struct branch *b;
    struct branch *prior;

    if (!t || !name || !data)
        pexit ("set_branch: NULL argument call\n");

    for (b = t->cont, prior = NULL; b; prior = b, b = b->next) {
        if (! strcmp (b->name, name)) {
            free (b->data);
            cpystr (&b->data, data);
            return;
        }
    }

    b = xmalloc (sizeof (struct branch));
    init_tree (b, name, data);
    if (!prior) /* if there is no content in branch *t, the prior remains NULL */
        t->cont = b;
    else
        prior->next = b;
}

/* Return the address of a struct branch */
struct branch *
get_branch (struct branch *t, char *name)
{
    struct branch *b;
    
    if (!t || !name)
        pexit ("get_brach: NULL argument call\n");

    for (b = t->cont; b; b = b->next)
        if (! strcmp (b->name, name))
            return b;
    
    return NULL;
}


/* Delete a struct branch an everything below that node */
void
del_branch (struct branch *t)
{
    if (t->cont) 
        del_branch (t->cont);

    if  (t->next)
        del_branch (t->next);
    
    free (t->name);
    free (t->data);
    free (t);
}

common.c

#include "common.h"

void
pexit (const char *msg)
{
    perror (msg);
    exit (EXIT_FAILURE);
} 
    
void *
xmalloc (size_t siz)
{
    void *n = malloc (siz);
    if (!n) 
        pexit ("malloc");
    return n;
}

void
cpystr (char **dst, char *src)
{
    int len = strlen (src) + 1;
    *dst = xmalloc (len);
    strncpy (*dst, src, len); 
}

test.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "tree.h"

main ()
{
    struct branch *myt = xmalloc (sizeof (struct branch));
    struct branch *buf;

    init_tree (myt, "root", "root_data");
    set_branch (myt, "etc", "etc_data");
    set_branch (myt, "usr", "usr_data");
    buf = get_branch (myt, "etc");
    set_branch (buf, "rc.conf", "rc.conf data");
    set_branch (myt, "etc", "etc_edited_data");

    del_branch (myt);
    return 0;
}