firmware/logf.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (C) 2005 by Daniel Stenberg
  11  *
  12  * All files in this archive are subject to the GNU General Public License.
  13  * See the file COPYING in the source tree root for full license agreement.
  14  *
  15  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  16  * KIND, either express or implied.
  17  *
  18  ****************************************************************************/
  19
  20 /*
  21  * logf() logs MAX_LOGF_ENTRY (21) bytes per entry in a circular buffer. Each
  22  * logged string is space- padded for easier and faster output on screen. Just
  23  * output MAX_LOGF_ENTRY characters on each line. MAX_LOGF_ENTRY bytes fit
  24  * nicely on the iRiver remote LCD (128 pixels with an 8x6 pixels font).
  25  */
  26
  27 #include <string.h>
  28 #include <stdio.h>
  29 #include <stdarg.h>
  30 #include <sprintf.h>
  31 #include "config.h"
  32 #include "lcd-remote.h"
  33 #include "logf.h"
  34
  35 /* Only provide all this if asked to */
  36 #ifdef ROCKBOX_HAS_LOGF
  37
  38 unsigned char logfbuffer[MAX_LOGF_LINES][MAX_LOGF_ENTRY];
  39 int logfindex;
  40 bool logfwrap;
  41
  42 #ifdef HAVE_REMOTE_LCD
  43 static void displayremote(void)
  44 {
  45     /* TODO: we should have a debug option that enables/disables this! */
  46     int w, h;
  47     int lines;
  48     int columns;
  49     int i;
  50     int index;
  51
  52     lcd_remote_getstringsize("A", &w, &h);
  53     lines = LCD_REMOTE_HEIGHT/h;
  54     columns = LCD_REMOTE_WIDTH/w;
  55     lcd_remote_setmargins(0, 0);
  56     lcd_remote_clear_display();
  57
  58     index = logfindex;
  59     for(i = lines-1; i>=0; i--) {
  60         unsigned char buffer[columns+1];
  61
  62         if(--index < 0) {
  63             if(logfwrap)
  64                 index = MAX_LOGF_LINES-1;
  65             else
  66                 break; /* done */
  67         }
  68
  69         memcpy(buffer, logfbuffer[index], columns);
  70         buffer[columns]=0;
  71         lcd_remote_puts(0, i, buffer);
  72     }
  73     lcd_remote_update();
  74 }
  75 #else
  76 #define displayremote()
  77 #endif
  78
  79 void logf(const char *format, ...)
  80 {
  81     int len;
  82     unsigned char *ptr;
  83     va_list ap;
  84     va_start(ap, format);
  85
  86     if(logfindex >= MAX_LOGF_LINES) {
  87         /* wrap */
  88         logfwrap = true;
  89         logfindex = 0;
  90     }
  91     ptr = logfbuffer[logfindex];
  92     len = vsnprintf(ptr, MAX_LOGF_ENTRY, format, ap);
  93     va_end(ap);
  94     if(len < MAX_LOGF_ENTRY)
  95         /* pad with spaces up to the MAX_LOGF_ENTRY byte border */
  96         memset(ptr+len, ' ', MAX_LOGF_ENTRY-len);
  97
  98     logfindex++; /* leave it where we write the next time */
  99
 100     displayremote();
 101 }
 102
 103 #endif