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/* $Id: vector.c,v 1.8 2003-05-29 21:07:22 rjkaes Exp $
*
* A vector implementation. The vector can be of an arbitrary length, and
* the data for each entry is an lump of data (the size is stored in the
* vector.)
*
* Copyright (C) 2002 Robert James Kaes (rjkaes@flarenet.com)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "tinyproxy.h"
#include "heap.h"
#include "vector.h"
/*
* These structures are the storage for the "vector". Entries are
* stored in struct vectorentry_s (the data and the length), and the
* "vector" structure is implemented as a linked-list. The struct
* vector_s stores a pointer to the first vector (vector[0]) and a
* count of the number of entries (or how long the vector is.)
*/
struct vectorentry_s {
void *data;
size_t len;
struct vectorentry_s *next;
};
struct vector_s {
size_t num_entries;
struct vectorentry_s *head;
struct vectorentry_s *tail;
};
/*
* Create an vector. The vector initially has no elements and no
* storage has been allocated for the entries.
*
* A NULL is returned if memory could not be allocated for the
* vector.
*/
vector_t
vector_create(void)
{
vector_t vector;
vector = safemalloc(sizeof(struct vector_s));
if (!vector)
return NULL;
vector->num_entries = 0;
vector->head = vector->tail = NULL;
return vector;
}
/*
* Deletes an vector. All the entries when this function is run.
*
* Returns: 0 on success
* negative if a NULL vector is supplied
*/
int
vector_delete(vector_t vector)
{
struct vectorentry_s *ptr, *next;
if (!vector)
return -EINVAL;
ptr = vector->head;
while (ptr) {
next = ptr->next;
safefree(ptr->data);
safefree(ptr);
ptr = next;
}
safefree(vector);
return 0;
}
/*
* Appends an entry into the vector. The entry is an arbitrary
* collection of bytes of _len_ octets. The data is copied into the
* vector, so the original data must be freed to avoid a memory leak.
* The "data" must be non-NULL and the "len" must be greater than zero.
* "pos" is either 0 to prepend the data, or 1 to append the data.
*
* Returns: 0 on success
* negative number if there are errors
*/
#define INSERT_PREPEND 0
#define INSERT_APPEND 1
static int
vector_insert(vector_t vector, void *data, ssize_t len, int pos)
{
struct vectorentry_s *entry;
if (!vector || !data || len <= 0 ||
(pos != INSERT_PREPEND && pos != INSERT_APPEND))
return -EINVAL;
entry = safemalloc(sizeof(struct vectorentry_s));
if (!entry)
return -ENOMEM;
entry->data = safemalloc(len);
if (!entry->data) {
safefree(entry);
return -ENOMEM;
}
memcpy(entry->data, data, len);
entry->len = len;
entry->next = NULL;
/* If there is no head or tail, create them */
if (!vector->head && !vector->tail)
vector->head = vector->tail = entry;
else if (pos == 0) {
/* prepend the entry */
entry->next = vector->head;
vector->head = entry;
} else {
/* append the entry */
vector->tail->next = entry;
vector->tail = entry;
}
vector->num_entries++;
return 0;
}
/*
* The following two function are used to make the API clearer. As you
* can see they simply call the vector_insert() function with appropriate
* arguments.
*/
int
vector_append(vector_t vector, void *data, ssize_t len)
{
return vector_insert(vector, data, len, INSERT_APPEND);
}
int
vector_prepend(vector_t vector, void *data, ssize_t len)
{
return vector_insert(vector, data, len, INSERT_PREPEND);
}
/*
* A pointer to the data at position "pos" (zero based) is returned in the
* "data" pointer. If the vector is out of bound, data is set to NULL.
*
* Returns: negative upon an error
* length of data if position is valid
*/
ssize_t
vector_getentry(vector_t vector, size_t pos, void **data)
{
struct vectorentry_s *ptr;
size_t loc;
if (!vector || !data)
return -EINVAL;
if (pos < 0 || pos >= vector->num_entries)
return -ERANGE;
loc = 0;
ptr = vector->head;
while (loc != pos) {
ptr = ptr->next;
loc++;
}
*data = ptr->data;
return ptr->len;
}
/*
* Returns the number of entries (or the length) of the vector.
*
* Returns: negative if vector is not valid
* positive length of vector otherwise
*/
ssize_t
vector_length(vector_t vector)
{
if (!vector)
return -EINVAL;
return vector->num_entries;
}
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