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#include <stdlib.h>
#include <errno.h>
#include <string.h>
struct ident_ref
{
char *name;
size_t count;
struct ident_ref *next;
};
static struct ident_ref *nametab;
int
ident_ref (char const *name, char const **refname)
{
struct ident_ref *ref = NULL;
if (!refname)
return EINVAL;
if (!name)
{
*refname = NULL;
return 0;
}
if (nametab)
{
for (ref = nametab; ref; ref = ref->next)
{
if (strcmp (ref->name, name) == 0)
break;
}
}
if (!ref)
{
ref = malloc (sizeof (*ref));
if (!ref)
return -1;
ref->name = strdup (name);
if (!ref->name)
{
free (ref);
return -1;
}
ref->count = 0;
ref->next = nametab;
nametab = ref;
}
ref->count++;
*refname = ref->name;
return 0;
}
void
ident_deref (char const *name)
{
struct ident_ref *ref, *prev;
if (!name || !nametab)
return;
for (ref = nametab, prev = NULL; ref; prev = ref, ref = ref->next)
{
if (strcmp (ref->name, name) == 0)
{
if (--ref->count == 0)
{
if (prev)
prev->next = ref->next;
else
nametab = ref->next;
free (ref->name);
free (ref);
}
break;
}
}
}
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