direct/timothy_tests/dev/message_buffer.c

   1 /*
   2  * YAFFS: Yet another FFS. A NAND-flash specific file system.
   3  *
   4  * Copyright (C) 2002-2011 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
  14 /*
  15  * message_buffer.c contains code for a message buffer .
  16  */
  17
  18 #include "message_buffer.h"
  19
  20 void append_to_buffer(buffer *p_Buffer, char *message,char message_level,char print){
  21         /*wrapper function for add_to_buffer_root_function*/
  22         add_to_buffer_root_function(p_Buffer,message, message_level,APPEND_MESSAGE,print);
  23 }
  24
  25 void add_to_buffer(buffer *p_Buffer, char *message,char message_level,char print){
  26         /*wrapper function for add_to_buffer_root_function*/
  27         add_to_buffer_root_function(p_Buffer,message, message_level,DO_NOT_APPEND_MESSAGE,print);
  28 }
  29
  30 void add_int_to_buffer(buffer *p_Buffer, int num,char message_level,char print){
  31         char message[20];
  32         sprintf(message, "%d",num);
  33         add_to_buffer_root_function(p_Buffer,message, message_level,DO_NOT_APPEND_MESSAGE,print);
  34 }
  35
  36 void append_int_to_buffer(buffer *p_Buffer, int num,char message_level,char print){
  37         char message[20];
  38         sprintf(message, "%d",num);
  39         add_to_buffer_root_function(p_Buffer,message, message_level,APPEND_MESSAGE,print);
  40 }
  41
  42
  43 void add_to_buffer_root_function(buffer *p_Buffer, char *message,char message_level,char append,char print){
  44         FILE *log_handle;
  45
  46         if (append==APPEND_MESSAGE){    /* append current message*/
  47                 strncat(p_Buffer->message[p_Buffer->head],message,BUFFER_MESSAGE_LENGTH);
  48         }
  49         else {
  50
  51                 /*move the head up one. the head always points at the last written data*/
  52                 p_Buffer->head++;
  53
  54                 /*printf("p_Buffer->tail=%d\n",p_Buffer->tail);*/
  55                 /*printf("p_Buffer->head=%d\n",p_Buffer->head);*/
  56                 if (p_Buffer->head >=BUFFER_SIZE-1) {
  57                         /*printf("buffer overflow\n");*/
  58                         p_Buffer->head -= (BUFFER_SIZE-1);      /*wrap the head around the buffer*/
  59                         /*printf("new p_Buffer->head=%d\n",p_Buffer->head);*/
  60                 }
  61                 /*if the buffer is full then delete last entry by moving the tail*/
  62                 if (p_Buffer->head==p_Buffer->tail){
  63                         /*printf("moving buffer tail from %d to ",p_Buffer->tail);*/
  64                         p_Buffer->tail++;
  65                         if (p_Buffer->tail >=BUFFER_SIZE) p_Buffer->tail -= BUFFER_SIZE;/*wrap the tail around the buffer*/
  66                         /*printf("%d\n",p_Buffer->tail);*/
  67
  68                 }
  69
  70                 p_Buffer->message_level[p_Buffer->head]=message_level; /*copy the message level*/
  71                 strncpy(p_Buffer->message[p_Buffer->head],message,BUFFER_MESSAGE_LENGTH); /*copy the message*/
  72                 /*printf("copied %s into p_Buffer->message[p_Buffer->head]: %s\n",message,p_Buffer->message[p_Buffer->head]);
  73                 printf("extra %s\n",p_Buffer->message[p_Buffer->head]);*/
  74         }
  75         if ((p_Buffer->message_level[p_Buffer->head]<=DEBUG_LEVEL)&& (print==PRINT)){
  76                 /*printf("printing buffer 1\n");
  77                 // the print buffer function is not working this is just a quick fix
  78                 print_buffer(p_Buffer,1); //if the debug level is higher enough then print the new message
  79                 */
  80                 printf("%s\n",p_Buffer->message[p_Buffer->head]);
  81                 log_handle=fopen(LOG_FILE,"a");
  82                 if (log_handle!=NULL){
  83                         fputs(p_Buffer->message[p_Buffer->head],log_handle);
  84                         fputs("\n",log_handle);
  85                         fclose(log_handle);
  86                 }
  87         }
  88 }
  89
  90
  91
  92 void print_buffer(buffer *p_Buffer, int number_of_messages_to_print){
  93         int x=0;
  94         int i=0;
  95         printf("print buffer\n");
  96         printf("buffer head:%d\n",p_Buffer->head);
  97         printf("buffer tail:%d\n",p_Buffer->tail);
  98
  99         if (number_of_messages_to_print==PRINT_ALL) number_of_messages_to_print=BUFFER_SIZE;
 100 //      printf("number_of_messages_to_print=%d\n",number_of_messages_to_print);
 101         for (i=0,x=0; (x>=p_Buffer->tail) && (i<number_of_messages_to_print); i++, x--){
 102 //              printf("printing buffer\n");
 103 //              printf("x:%d\n",x);
 104                 if (x<0) x = BUFFER_SIZE-1;             /*wrap x around buffer*/
 105                 printf("%s\n",p_Buffer->message[p_Buffer->head]);
 106                 printf("printed buffer\n");
 107         }
 108
 109 }
 110
 111
 112