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#include <stdlib.h>
#include <string.h>
#include "procfs.h"
#include "procfs_dir.h"
struct procfs_dir_node
{
const struct procfs_dir_entry *entries;
void *hook;
void (*cleanup) (void *hook);
};
static error_t
procfs_dir_get_contents (void *hook, char **contents, ssize_t *contents_len)
{
static const char dot_dotdot[] = ".\0..";
struct procfs_dir_node *dn = hook;
const struct procfs_dir_entry *ent;
char *pos;
*contents_len = sizeof dot_dotdot;
for (ent = dn->entries; ent->name; ent++)
*contents_len += strlen (ent->name) + 1;
*contents = malloc (*contents_len);
if (! *contents)
return ENOMEM;
memcpy (*contents, dot_dotdot, sizeof dot_dotdot);
pos = *contents + sizeof dot_dotdot;
for (ent = dn->entries; ent->name; ent++)
{
strcpy (pos, ent->name);
pos += strlen (ent->name) + 1;
}
return 0;
}
static error_t
procfs_dir_lookup (void *hook, const char *name, struct node **np)
{
struct procfs_dir_node *dn = hook;
const struct procfs_dir_entry *ent;
for (ent = dn->entries; ent->name && strcmp (name, ent->name); ent++);
if (! ent->name)
return ENOENT;
*np = ent->make_node (dn->hook, ent->hook);
if (! *np)
return ENOMEM;
return 0;
}
static void
procfs_dir_cleanup (void *hook)
{
struct procfs_dir_node *dn = hook;
if (dn->cleanup)
dn->cleanup (dn->hook);
free (dn);
}
struct node *
procfs_dir_make_node (const struct procfs_dir_entry *entries,
void *dir_hook, void (*cleanup) (void *dir_hook))
{
static const struct procfs_node_ops ops = {
.get_contents = procfs_dir_get_contents,
.lookup = procfs_dir_lookup,
.cleanup_contents = procfs_cleanup_contents_with_free,
.cleanup = procfs_dir_cleanup,
};
struct procfs_dir_node *dn;
dn = malloc (sizeof *dn);
if (! dn)
{
if (cleanup)
cleanup (dir_hook);
return NULL;
}
dn->entries = entries;
dn->hook = dir_hook;
dn->cleanup = cleanup;
return procfs_make_node (&ops, dn);
}
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