direct/timothy_tests/message_buffer.c

   1 /*
   2  * YAFFS: Yet another FFS. A NAND-flash specific file system.
   3  *
   4  * Copyright (C) 2002-2010 Aleph One Ltd.
   5  *   for Toby Churchill Ltd and Brightstar Engineering
   6  *
   7  * Created by Timothy Manning <timothy@yaffs.net>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  *
  13  * message_buffer.c contains code for a message buffer .
  14  */
  15
  16 #include "message_buffer.h"
  17
  18 void append_to_buffer(buffer *p_Buffer, char *message,char message_level,char print){
  19         /*wrapper function for add_to_buffer_root_function*/
  20         add_to_buffer_root_function(p_Buffer,message, message_level,APPEND_MESSAGE,print);
  21 }
  22
  23 void add_to_buffer(buffer *p_Buffer, char *message,char message_level,char print){
  24         /*wrapper function for add_to_buffer_root_function*/
  25         add_to_buffer_root_function(p_Buffer,message, message_level,DO_NOT_APPEND_MESSAGE,print);
  26 }
  27
  28 void add_to_buffer_root_function(buffer *p_Buffer, char *message,char message_level,char append,char print){
  29
  30         if (append==APPEND_MESSAGE){    /* append current message*/
  31                 strncat(p_Buffer->message[p_Buffer->head],message,BUFFER_MESSAGE_LENGTH);
  32         }
  33         else {
  34
  35                 /*move the head up one. the head always points at the last written data*/
  36                 p_Buffer->head++;
  37
  38                 /*printf("p_Buffer->tail=%d\n",p_Buffer->tail);*/
  39                 /*printf("p_Buffer->head=%d\n",p_Buffer->head);*/
  40                 if (p_Buffer->head >=BUFFER_SIZE-1) {
  41                         /*printf("buffer overflow\n");*/
  42                         p_Buffer->head -= (BUFFER_SIZE-1);      /*wrap the head around the buffer*/
  43                         /*printf("new p_Buffer->head=%d\n",p_Buffer->head);*/
  44                 }
  45                 /*if the buffer is full then delete last entry by moving the tail*/
  46                 if (p_Buffer->head==p_Buffer->tail){
  47                         /*printf("moving buffer tail from %d to ",p_Buffer->tail);*/
  48                         p_Buffer->tail++;
  49                         if (p_Buffer->tail >=BUFFER_SIZE) p_Buffer->tail -= BUFFER_SIZE;/*wrap the tail around the buffer*/
  50                         /*printf("%d\n",p_Buffer->tail);*/
  51
  52                 }
  53
  54                 p_Buffer->message_level[p_Buffer->head]=message_level; /*copy the message level*/
  55                 strncpy(p_Buffer->message[p_Buffer->head],message,BUFFER_MESSAGE_LENGTH); /*copy the message*/
  56                 /*printf("copied %s into p_Buffer->message[p_Buffer->head]: %s\n",message,p_Buffer->message[p_Buffer->head]);
  57                 printf("extra %s\n",p_Buffer->message[p_Buffer->head]);*/
  58         }
  59         if ((p_Buffer->message_level[p_Buffer->head]<=DEBUG_LEVEL)&& (print==PRINT)){
  60                 /*printf("printing buffer 1\n");
  61                 // the print buffer function is not working this is just a quick fix
  62                 print_buffer(p_Buffer,1); //if the debug level is higher enough then print the new message
  63                 */
  64                 printf("%s\n",p_Buffer->message[p_Buffer->head]);
  65         }
  66 }
  67
  68
  69
  70 void print_buffer(buffer *p_Buffer, int number_of_messages_to_print){
  71         int x=0;
  72         int i=0;
  73         printf("print buffer\n");
  74         printf("buffer head:%d\n",p_Buffer->head);
  75         printf("buffer tail:%d\n",p_Buffer->tail);
  76
  77         if (number_of_messages_to_print==PRINT_ALL) number_of_messages_to_print=BUFFER_SIZE;
  78 //      printf("number_of_messages_to_print=%d\n",number_of_messages_to_print);
  79         for (i=0,x=0; (x>=p_Buffer->tail) && (i<number_of_messages_to_print); i++, x--){
  80 //              printf("printing buffer\n");
  81 //              printf("x:%d\n",x);
  82                 if (x<0) x = BUFFER_SIZE-1;             /*wrap x around buffer*/
  83                 printf("%s\n",p_Buffer->message[p_Buffer->head]);
  84                 printf("printed buffer\n");
  85         }
  86
  87 }
  88