韦东山裸机代码

				#include "vsprintf.h"				#include "printf.h"				#include "string.h"								extern void putc(unsigned char c);				extern unsigned char getc(void);								#define	OUTBUFSIZE	1024				#define	INBUFSIZE	1024												static unsigned char g_pcOutBuf[OUTBUFSIZE];				static unsigned char g_pcInBuf[INBUFSIZE];												int printf(const char *fmt, ...)				{					int i;					int len;					va_list args;									va_start(args, fmt);					len = vsprintf(g_pcOutBuf,fmt,args);					va_end(args);					for (i = 0; i < strlen(g_pcOutBuf); i++)					{						putc(g_pcOutBuf[i]);					}					return len;				}																int scanf(const char * fmt, ...)				{					int i = 0;					unsigned char c;					va_list args;										while(1)					{						c = getc();						if((c == 0x0d) || (c == 0x0a))						{							g_pcInBuf[i] = '\0';							break;						}						else						{							g_pcInBuf[i++] = c;						}					}										va_start(args,fmt);					i = vsscanf(g_pcInBuf,fmt,args);					va_end(args);									return i;				}