utils.c

来自「LPC2294 测试程序 YL_LPC229X_Test_Data的目录说明」· C语言 代码 · 共 222 行

#include "../inc/def.h"
#include "../inc/board.h"
#include "../inc/utils.h"



/*---------------------printf and support routines ---------------------*/
/* print c count times */
void PutRepChar( char c , int count )
{
	while ( count-- )
		putch( c );
}

/* put string reverse */
void PutStringReverse( char* s , int index )
{
	while ( ( index-- ) > 0 )
		putch( s[index] );
}

/*-------------------------------------------------------------------------*/
/* 
   prints value in radix, in a field width width, with fill
   character fill
   if radix is negative, print as signed quantity
   if width is negative, left justify
   if width is 0, use whatever is needed
   if fill is 0, use ' '
 */

static void PutNumber( int value , int radix , int width , char fill )
{
	char buffer[40];
	int bi = 0;
	int unsigned uvalue;
	short int digit;
	short int left = FALSE;
	short int negative = FALSE;

	if ( fill == 0 )
		fill = ' ';

	if ( width < 0 )
	{
		width = -width;
		left = TRUE;
	}
	if ( width <0 || width> 80 )
		width = 0;

	if ( radix < 0 )
	{
		radix = -radix;
		if ( value < 0 )
		{
			negative = TRUE;
			value = -value;
		}
	}
	uvalue = value;
	do
	{
		if ( radix != 16 )
		{
			digit = uvalue % radix ;
			uvalue = uvalue / radix ;
		}
		else
		{
			digit = uvalue & 0xf;
			uvalue = uvalue >> 4;
		}
		buffer[bi] = digit + ( ( digit <= 9 ) ? '0' : ( 'A' - 10 ) );
		bi++;

		if ( uvalue != 0 )
		{
			if ( ( radix == 10 ) &&
				( ( bi == 3 ) || ( bi == 7 ) || ( bi == 11 ) | ( bi == 15 ) ) )
			{
				buffer[bi++] = ',';
			}
		}
	}
	while ( uvalue != 0 );

	if ( negative )
	{
		buffer[bi] = '-';
		bi += 1;
	}
	if ( width <= bi )
		PutStringReverse( buffer , bi );
	else
	{
		width -= bi;
		if ( !left )
			PutRepChar( fill , width );
		PutStringReverse( buffer , bi );
		if ( left )
			PutRepChar( fill , width );
	}
}

/*-------------------------------------------------------------------------*/
static char* FormatItem( char* f , int a )
{
	char c;
	int fieldwidth = 0;
	int leftjust = FALSE;
	int radix = 0;
	char fill = ' ';

	if ( *f == '0' )
		fill = '0';
	while ( ( c = *f++ ) != 0 )
	{
		if ( c >= '0' && c <= '9' )
		{
			fieldwidth = ( fieldwidth * 10 ) + ( c - '0' );
		}
		else
			switch ( c )
			{
				case '\000':
					return( --f );
				case '%':
					putch( '%' );
					return( f );
				case '-':
					leftjust = TRUE;
					break;
				case 'c':
					{
						if ( leftjust )
							putch( a & 0x7f );
						if ( fieldwidth > 0 )
							PutRepChar( fill , fieldwidth - 1 );
						if ( !leftjust )
							putch( a & 0x7f );
						return( f );
					}
				case 's':
					{
						if ( leftjust )
							puts( ( char * ) a );
						if ( fieldwidth > strlen( ( char * ) a ) )
							PutRepChar( fill ,
								fieldwidth - strlen( ( char * ) a ) );
						if ( !leftjust )
							puts( ( char * ) a );
						return( f );
					}
				case 'd':
				case 'i':
					radix = -10;break;
				case 'u':
					radix = 10;break;
				case 'x':
					radix = 16;break;
				case 'X':
					radix = 16;break;
				case 'o':
					radix = 8;break;
				default :
					radix = 3;break;/* unknown switch! */
			}
		if ( radix )
			break;
	}
	if ( leftjust )
		fieldwidth = -fieldwidth;
	PutNumber( a , radix , fieldwidth , fill );
	return( f );
}

#define vaStart(list, param) list = (char*)((int)&param + sizeof(param))
#define vaArg(list, type) ((type *)(list += sizeof(type)))[-1]
#define vaEnd(list)

void printf( char* f , ... )	   /* variable arguments */
{
	//	U32 mode ;
	char* argP;

	/* disable IRQs and FIQs */
	//	mode = uHALir_ReadMode() ;
	//	uHALir_WriteMode(mode | NoFIQ | NoIRQ) ;

	vaStart( argP , f );		/* point at the end of the format string */
	while ( *f )
	{
		/* this works because args are all ints */
		if ( *f == '%' )
			f = FormatItem( f + 1 , vaArg( argP , int ) );
		else
			putch( *f++ );
	}
	vaEnd( argP );

	/* restore the previous mode */
	//	uHALir_WriteMode(mode) ;
}

int getyorn( void )
{
	char c;

	puts( " [y/n] " );
	while ( 1 )
	{
		c = getch();
		if ( ( c == 'y' ) || ( c == 'Y' ) || ( c == 'n' ) || ( c == 'N' ) )
			break;
	}
	putch( c );
	putch( '\n' );
	return c & 1;	//y&Y are odd, n&N are even
}