history.c.bak

思创S3C44B0黄金开发板一个简化版本的BOOTLOADER

/*********************************************************************
 ********************************************************************/
 
#include <stdio.h>
#include <string.h>
#include "common.h"

/********************************************************************/

#define MAX_HISTORY_REC (5)

#define CTRL_U  0x15  /* command line previous */
#define CTRL_D  0x04  /* command line next */
#define CTRL_R  0x12  /* last command repeat */

typedef char HISTENT[MAX_LINE_LEN];
HISTENT   History[MAX_HISTORY_REC+1];

/*******************************************************************/
void HistoryInit (void)
{
  int index;
  memset(History,MAX_HISTORY * MAX_LINE_LEN, 0);
}

/********************************************************************/
static int HistoryDown (int *CurrHist, char *Line)
{
  *CurrHist -= 1;
  if (*CurrHist < 0)
  {
    *CurrHist = -1;
    Line[0] = '\0';
    return 0;
  }
  strcpy(Line, History[*CurrHist]);
  return strlen(Line);
}

/********************************************************************/
static int HistoryUp (int *CurrHist, char *Line)
{
  if (*CurrHist == -1) *CurrHist = 0;
  else {
    *CurrHist ++;
    if (*CurrHist >= MAX_HISTORY) *CurrHist = (MAX_HISTORY-1);
  }
  strcpy(Line, History[*CurrHist]);
  return strlen(line);
}

/********************************************************************/
static int HistoryRepeat (char *Line)
{
  strcpy(Line, History[0]);
  return strlen(Line);
}

/********************************************************************/
static void HistoryAdd (char *Line)
{
  int index;
  for (index = (MAX_HISTORY-1); index > 0; --index)
    if (!strcmp(History[index],Line)) break;
  if (index == (MAX_HISTORY-1)) {
    for (index = (MAX_HISTORY-1); index > 0; --index)
      strcpy(History[index],History[index-1]);
    strcpy(History[0], Line);
  } else {
    strcpy(History[MAX_HISTORY], History[0]);
    strcpy(History[0],History[index]);
    strcpy(History[index],History[MAX_HISTORY]);
  }
}

/********************************************************************/
char *GetHistoryLine (char *userline)
{
  char Line[MAX_LINE];
  int  Pos,CurrHist,Repeat;
  int  ch, i;
  
  CurrHist = -1;
  Repeat   = FALSE;
  Pos      = 0;

  ch = (int)Getchar();
  while ( (ch != 0x0D /* CR */) &&
      (ch != 0x0A /* LF/NL */) &&
      (Pos < MAX_LINE))
  {
    switch (ch)
    {
      case 0x08:    /* Backspace */
      case 0x7F:    /* Delete */
        if (Pos > 0)
        {
          Pos -= 1;
          putchar(0x08);  /* backspace */
          board_putchar(' ');
          board_putchar(0x08);  /* backspace */
        }
        break;
      case CTRL_U:
      case CTRL_D:
      case CTRL_R:
        for (i = 0; i < pos; ++i)
        {
          board_putchar(0x08);  /* backspace */
          board_putchar(' ');
          board_putchar(0x08);  /* backspace */
        }
        if (ch == CTRL_U)
        {
          pos = history_up(&curr_hist,line);
          break;
        }
        if (ch == CTRL_D)
        {
          pos = history_down(&curr_hist,line);
          break;
        }
        if (ch == CTRL_R)
        {
          pos = history_repeat(line);
          repeat = TRUE;
        }
        break;
      default:
        if ((pos+1) < UIF_MAX_LINE)
        {
          /* only printable characters */
          if ((ch > 0x1f) && (ch < 0x80))
          {
            line[pos++] = (char)ch;
            board_putchar((char)ch);
          }
        }
        break;
    }

    if (repeat)
    {
      break;
    }
    ch = (int)board_getchar();
  }
  line[pos] = '\0';
  board_putchar(0x0D);  /* CR */
  board_putchar(0x0A);  /* LF */

  if ((strlen(line) != 0) && !repeat)
  {
    history_add(line);
  }
  strcpy(userline,line);

  return userline;
}

/********************************************************************/