ban4jp - / Mbed 2 deprecated uIP-1-0_webserver

uIP 1.0 based webserver for LPC1114 + ENC28J60

Dependencies:   mbed TMP102

lib/memb.c@3:a2715e9c7737, 2014-06-30 (annotated)

Committer:
ban4jp
Date:
Mon Jun 30 16:00:08 2014 +0000
Revision:
3:a2715e9c7737
Parent:
0:685224d2f66d 
backported from Contiki 2.7

Who changed what in which revision?

UserRevisionLine numberNew contents of line
ban4jp 0:685224d2f66d 1 /*
ban4jp 0:685224d2f66d 2 * Copyright (c) 2004, Swedish Institute of Computer Science.
ban4jp 0:685224d2f66d 3 * All rights reserved.
ban4jp 0:685224d2f66d 4 *
ban4jp 0:685224d2f66d 5 * Redistribution and use in source and binary forms, with or without
ban4jp 0:685224d2f66d 6 * modification, are permitted provided that the following conditions
ban4jp 0:685224d2f66d 7 * are met:
ban4jp 0:685224d2f66d 8 * 1. Redistributions of source code must retain the above copyright
ban4jp 0:685224d2f66d 9 * notice, this list of conditions and the following disclaimer.
ban4jp 0:685224d2f66d 10 * 2. Redistributions in binary form must reproduce the above copyright
ban4jp 0:685224d2f66d 11 * notice, this list of conditions and the following disclaimer in the
ban4jp 0:685224d2f66d 12 * documentation and/or other materials provided with the distribution.
ban4jp 0:685224d2f66d 13 * 3. Neither the name of the Institute nor the names of its contributors
ban4jp 0:685224d2f66d 14 * may be used to endorse or promote products derived from this software
ban4jp 0:685224d2f66d 15 * without specific prior written permission.
ban4jp 0:685224d2f66d 16 *
ban4jp 0:685224d2f66d 17 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
ban4jp 0:685224d2f66d 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
ban4jp 0:685224d2f66d 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ban4jp 0:685224d2f66d 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
ban4jp 0:685224d2f66d 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
ban4jp 0:685224d2f66d 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
ban4jp 0:685224d2f66d 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
ban4jp 0:685224d2f66d 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
ban4jp 0:685224d2f66d 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
ban4jp 0:685224d2f66d 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
ban4jp 0:685224d2f66d 27 * SUCH DAMAGE.
ban4jp 0:685224d2f66d 28 *
ban4jp 0:685224d2f66d 29 * This file is part of the uIP TCP/IP stack
ban4jp 0:685224d2f66d 30 *
ban4jp 0:685224d2f66d 31 * Author: Adam Dunkels <adam@sics.se>
ban4jp 0:685224d2f66d 32 *
ban4jp 0:685224d2f66d 33 * $Id: memb.c,v 1.1 2006/06/12 08:21:43 adam Exp $
ban4jp 0:685224d2f66d 34 */
ban4jp 0:685224d2f66d 35
ban4jp 0:685224d2f66d 36 /**
ban4jp 0:685224d2f66d 37 * \addtogroup memb
ban4jp 0:685224d2f66d 38 * @{
ban4jp 0:685224d2f66d 39 */
ban4jp 0:685224d2f66d 40
ban4jp 0:685224d2f66d 41 /**
ban4jp 0:685224d2f66d 42 * \file
ban4jp 0:685224d2f66d 43 * Memory block allocation routines.
ban4jp 0:685224d2f66d 44 * \author Adam Dunkels <adam@sics.se>
ban4jp 0:685224d2f66d 45 */
ban4jp 0:685224d2f66d 46 #include <string.h>
ban4jp 0:685224d2f66d 47
ban4jp 0:685224d2f66d 48 #include "memb.h"
ban4jp 0:685224d2f66d 49
ban4jp 0:685224d2f66d 50 /*---------------------------------------------------------------------------*/
ban4jp 0:685224d2f66d 51 void
ban4jp 0:685224d2f66d 52 memb_init(struct memb_blocks *m)
ban4jp 0:685224d2f66d 53 {
ban4jp 0:685224d2f66d 54 memset(m->count, 0, m->num);
ban4jp 0:685224d2f66d 55 memset(m->mem, 0, m->size * m->num);
ban4jp 0:685224d2f66d 56 }
ban4jp 0:685224d2f66d 57 /*---------------------------------------------------------------------------*/
ban4jp 0:685224d2f66d 58 void *
ban4jp 0:685224d2f66d 59 memb_alloc(struct memb_blocks *m)
ban4jp 0:685224d2f66d 60 {
ban4jp 0:685224d2f66d 61 int i;
ban4jp 0:685224d2f66d 62
ban4jp 0:685224d2f66d 63 for(i = 0; i < m->num; ++i) {
ban4jp 0:685224d2f66d 64 if(m->count[i] == 0) {
ban4jp 0:685224d2f66d 65 /* If this block was unused, we increase the reference count to
ban4jp 0:685224d2f66d 66 indicate that it now is used and return a pointer to the
ban4jp 0:685224d2f66d 67 memory block. */
ban4jp 0:685224d2f66d 68 ++(m->count[i]);
ban4jp 0:685224d2f66d 69 return (void *)((char *)m->mem + (i * m->size));
ban4jp 0:685224d2f66d 70 }
ban4jp 0:685224d2f66d 71 }
ban4jp 0:685224d2f66d 72
ban4jp 0:685224d2f66d 73 /* No free block was found, so we return NULL to indicate failure to
ban4jp 0:685224d2f66d 74 allocate block. */
ban4jp 0:685224d2f66d 75 return NULL;
ban4jp 0:685224d2f66d 76 }
ban4jp 0:685224d2f66d 77 /*---------------------------------------------------------------------------*/
ban4jp 0:685224d2f66d 78 char
ban4jp 0:685224d2f66d 79 memb_free(struct memb_blocks *m, void *ptr)
ban4jp 0:685224d2f66d 80 {
ban4jp 0:685224d2f66d 81 int i;
ban4jp 0:685224d2f66d 82 char *ptr2;
ban4jp 0:685224d2f66d 83
ban4jp 0:685224d2f66d 84 /* Walk through the list of blocks and try to find the block to
ban4jp 0:685224d2f66d 85 which the pointer "ptr" points to. */
ban4jp 0:685224d2f66d 86 ptr2 = (char *)m->mem;
ban4jp 0:685224d2f66d 87 for(i = 0; i < m->num; ++i) {
ban4jp 0:685224d2f66d 88
ban4jp 0:685224d2f66d 89 if(ptr2 == (char *)ptr) {
ban4jp 0:685224d2f66d 90 /* We've found to block to which "ptr" points so we decrease the
ban4jp 0:685224d2f66d 91 reference count and return the new value of it. */
ban4jp 0:685224d2f66d 92 if(m->count[i] > 0) {
ban4jp 0:685224d2f66d 93 /* Make sure that we don't deallocate free memory. */
ban4jp 0:685224d2f66d 94 --(m->count[i]);
ban4jp 0:685224d2f66d 95 }
ban4jp 0:685224d2f66d 96 return m->count[i];
ban4jp 0:685224d2f66d 97 }
ban4jp 0:685224d2f66d 98 ptr2 += m->size;
ban4jp 0:685224d2f66d 99 }
ban4jp 0:685224d2f66d 100 return -1;
ban4jp 0:685224d2f66d 101 }
ban4jp 0:685224d2f66d 102 /*---------------------------------------------------------------------------*/
ban4jp 0:685224d2f66d 103
ban4jp 0:685224d2f66d 104 /** @} */