utils.c

一个在ARM上通用的IIC的程序,已经测试用过了,

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

void memcpy(void *s1, const void *s2, int n)
{
	int i;

	for (i = 0; i < n; i++)
		((char *)(s1))[i] = ((const char *)(s2))[i];
}

void memset(void *s, const char ch, int n)
{
	int i;

	for (i = 0; i < n; i++)
		((char *)(s))[i] = ch;
}

unsigned short ntohs(unsigned short s)
{
	return (s >> 8) | (s << 8);
}

unsigned long ntohl(unsigned long l)
{
	return  ((l >> 24) & 0x000000ff) |
		((l >>  8) & 0x0000ff00) |
		((l <<  8) & 0x00ff0000) |
		((l << 24) & 0xff000000);
}

unsigned short htons(unsigned short s)
{
	return (s >> 8) | (s << 8);
}

unsigned long htonl(unsigned long l)
{
	return ntohl(l);
/*	return  ((l >> 24) & 0x000000ff) |
		((l >>  8) & 0x0000ff00) |
		((l <<  8) & 0x00ff0000) |
		((l << 24) & 0xff000000);*/
}

unsigned long strtoul(char *s)
{
	unsigned long ret;
	int i;

	ret = 0;

	while (*s != '\0') {
		if (*s >= '0' && *s <= '9')
			i = *s - '0';
		else if (*s >= 'a' && *s <= 'f')
			i = *s - 'a' + 0xa;
		else if (*s >= 'A' && *s <= 'F')
			i = *s - 'A' + 0xa;
		else
			return -1;
		ret = (ret << 4) + i;
		s++;
	}

	return ret;
}

void ultostr(char *s, unsigned long data)
{
	int i;
	
	s[8] = 0;
	for(i=7; i>=0; i--, data >>=4)
	{
		if((data&0xf)<=9)
			s[i] = (data&0xf)+'0';
		else
			s[i] = (data&0xf)+'a'-0x0a;
	}	
}

unsigned long strtobcd(char *s)
{
	unsigned long ret;
	int i;

	ret = 0;

	while (*s != '\0') {
		if (*s >= '0' && *s <= '9')
			i = *s - '0';
		else
			return -1;
		ret = (ret << 4) + i;
		s++;
	}

	return ret;
}

unsigned long strtodec(char *str, int cnt)
{
	unsigned long i, data = 0;	
	
	for(i=0; i<cnt; i++)
	{
		data *= 10;
		if(str[i]<'0'||str[i]>'9')
			return -1;
		data += str[i]-'0';			
	}	
	return data;
}

int strlen(const char *s)
{
	int i = 0;

	for(; *s; s++)
		i++;
	
	return i;
}

int strncmp(const char *s1, const char *s2, int maxlen)
{
	int i;

	for(i = 0; i < maxlen; i++) {
		if(s1[i] != s2[i])
			return ((int) s1[i]) - ((int) s2[i]);
		if(s1[i] == 0)
			return 0;
	}

	return 0;
}

/*---------------------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
}

int GetParameter(char *str, int cnt)
{
	int i, key;	
	
	i = 0;
	while(1)
	{
		key = getch();
		if(key)
		{
			if(key == ENTER_KEY)
			{
				str[i] = 0;
				return i;
			}
			else if(key == BACK_KEY && i>0)
			{
				i--;
				printf("\b \b");
			}
			else if(key == 0x1b)
			{
				//getch();
				//getch();
				return -1;
			}
			else if(key>=0x20 && key<=0x7e && i<cnt)
			{
				str[i++] = key;
				putch(key);
			}				
		}
	}	
}