/**********************************************************************************
 * kernlib.c                                                                         
 * coded by hspark@pplab.ce.cnu.ac.kr
 * 
 **********************************************************************************/

char *
MK_Strcpy(char *pDst, char *pSrc)
{	
	char *p;	

	p = pDst;

	while(*pSrc != 0x00)
	{
		*pDst++ = *pSrc++;
	}
	*pDst++='\0';

	return(p);
}

int
MK_Strlen(char *pString)
{
	int Length;

	Length=0;
	while(*pString++ != '\0')
	{
		Length++;
	}
	return Length;
}

int 
MK_Strcmp(char *pStr1, char *pStr2)
{
	while(*pStr1 != '\0')
	{
		if(*pStr1++ != *pStr2++)
			return( (*pStr2) - (*pStr1) );
	}

	return 0;
}

char * 
MK_Strcat(char *pStr1, char *pStr2)
{
	while( *pStr1++ != 0 )
	{
		;
	}

	while(*pStr2 != '\0')
	{
		if(*pStr1++ != *pStr2++);
	}

	return pStr1;
}

char *
MK_BlockCopy(char *pDst, char *pSrc, int Length)
{
	int i;

	if(Length<=0)
		return pDst;

	for(i=0; i<Length; i++)
	{
		*pDst++ = *pSrc++;
	}
	return pDst;
}

char *
MK_MemCopy(char *pDst, char Ch, int Length)
{
	int i;

	if(Length<=0)
		return pDst;

	for(i=0; i<Length; i++)
	{
		*pDst++ = Ch;
	}
	return pDst;
}

#if 0

static unsigned char toupper(unsigned char c);

/* we use this so that we can do without the ctype library */
#define is_digit(c)	((c) >= '0' && (c) <= '9')
#define islower(c) (((c) >= 'a' && (c) <= 'z') ? 1 : 0)
#define isdigit(c) (((c) >= '0' && (c) <= '9') ? 1 : 0)
#define isxdigit(c) (((c) >= '0' && (c) <= '9' || toupper(c) >= 'A' && toupper(c) <= 'F') ? 1 : 0)

static unsigned char toupper(unsigned char c)
{
	if (islower(c))
		c -= 'a'-'A';
	return c;
}

unsigned long simple_strtoul(const char *cp,char **endp,unsigned int base)
{
	unsigned long result = 0,value;

	if (!base) {
		base = 10;
		if (*cp == '0') {
			base = 8;
			cp++;
			if ((*cp == 'x') && isxdigit(cp[1])) {
				cp++;
				base = 16;
			}
		}
	}
	while (isxdigit(*cp) && (value = isdigit(*cp) ? *cp-'0' : (islower(*cp)
	    ? toupper(*cp) : *cp)-'A'+10) < base) {
		result = result*base + value;
		cp++;
	}
	if (endp)
		*endp = (char *)cp;
	return result;
}

long simple_strtol(const char *cp,char **endp,unsigned int base)
{
	if(*cp=='-')
		return -((long)simple_strtoul(cp+1,endp,base));
	return simple_strtoul(cp,endp,base);
}

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

	while (is_digit(**s))
		i = i*10 + *((*s)++) - '0';
	return i;
}

#define ZEROPAD	1		/* pad with zero */
#define SIGN	2		/* unsigned/signed long */
#define PLUS	4		/* show plus */
#define SPACE	8		/* space if plus */
#define LEFT	16		/* left justified */
#define SPECIAL	32		/* 0x */
#define LARGE	64		/* use 'ABCDEF' instead of 'abcdef' */

#if 0
#define MK_DoDiv(n,base) ({ \
int __res; \
__res = ((unsigned long) n) % (unsigned) base; \
n = ((unsigned long) n) / (unsigned) base; \
__res; })
#endif /* 0 */

int 
MK_DoDiv(long *num, int *base){
	int res;

	res = ((unsigned long) *num) % (unsigned) *base;
	*num = ((unsigned long) *num) / (unsigned) *base;

	return res; 
}

int 
MK_Strnlen(const char * s, int count)
{
	const char *sc;

	for (sc = s; count-- && *sc != '\0'; ++sc)
		/* nothing */;
	return sc - s;
}

static char * MK_Number(char * str, long num, int base, int size, int precision
	,int type)
{
	char c,sign,tmp[66];
/*	const char *digits="0123456789abcdefghijklmnopqrstuvwxyz"; */
	char *digits="0123456789abcdefghijklmnopqrstuvwxyz";

	int i;

	if (type & LARGE)
		digits = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
	if (type & LEFT)
		type &= ~ZEROPAD;
	if (base < 2 || base > 36)
		return 0;
	c = (char)((type & ZEROPAD) ? '0' : ' ');
	sign = 0;
	if (type & SIGN) {
		if (num < 0) {
			sign = '-';
			num = -num;
			size--;
		} else if (type & PLUS) {
			sign = '+';
			size--;
		} else if (type & SPACE) {
			sign = ' ';
			size--;
		}
	}
	if (type & SPECIAL) {
		if (base == 16)
			size -= 2;
		else if (base == 8)
			size--;
	}
	i = 0;
	if (num == 0)
		tmp[i++]='0';
	else while (num != 0)
		tmp[i++] = digits[MK_DoDiv(&num,&base)];
	if (i > precision)
		precision = i;
	size -= precision;
	if (!(type&(ZEROPAD+LEFT)))
		while(size-->0)
			*str++ = ' ';
	if (sign)
		*str++ = sign;
	if (type & SPECIAL) {
		if (base==8)
			*str++ = '0';
		else if (base==16) {
			*str++ = '0';
			*str++ = digits[33];
		}
	}

	if (!(type & LEFT))
		while (size-- > 0)
			*str++ = c;
	while (i < precision--)
		*str++ = '0';
	while (i-- > 0)
		*str++ = tmp[i];
	while (size-- > 0)
		*str++ = ' ';
	return str;
}

/* Forward decl. needed for IP address printing stuff... */
int sprintf(char * buf, const char *fmt, ...);

int 
MK_VSprintf(char *buf, const char *fmt, va_list args)
{
	int len;
	unsigned long num;
	int i, base;
	char * str;
/*	const char *s; */
	const char *s;

	int flags;		/* flags to MK_Number() */

	int field_width;	/* width of output field */
	int precision;		/* min. # of digits for integers; max
				   MK_Number of chars for from string */
	int qualifier;		/* 'h', 'l', or 'L' for integer fields */

	for (str=buf ; *fmt ; ++fmt) {
		if (*fmt != '%') {
			*str++ = *fmt;
			continue;
		}

		/* process flags */
		flags = 0;
		repeat:
			++fmt;		/* this also skips first '%' */
			switch (*fmt) {
				case '-': flags |= LEFT; goto repeat;
				case '+': flags |= PLUS; goto repeat;
				case ' ': flags |= SPACE; goto repeat;
				case '#': flags |= SPECIAL; goto repeat;
				case '0': flags |= ZEROPAD; goto repeat;
				}
		
		/* get field width */
		field_width = -1;
		if (is_digit(*fmt))
			field_width = MK_Skip_atoi(&fmt);
		else if (*fmt == '*') {
			++fmt;
			/* it's the next argument */
			field_width = va_arg(args, int);
			if (field_width < 0) {
				field_width = -field_width;
				flags |= LEFT;
			}
		}

		/* get the precision */
		precision = -1;
		if (*fmt == '.') {
			++fmt;	
			if (is_digit(*fmt))
				precision = MK_Skip_atoi(&fmt);
			else if (*fmt == '*') {
				++fmt;
				/* it's the next argument */
				precision = va_arg(args, int);
			}
			if (precision < 0)
				precision = 0;
		}

		/* get the conversion qualifier */
		qualifier = -1;
		if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L') {
			qualifier = *fmt;
			++fmt;
		}

		/* default base */
		base = 10;

		switch (*fmt) {
		case 'c':
			if (!(flags & LEFT))
				while (--field_width > 0)
					*str++ = ' ';
			*str++ = (unsigned char) va_arg(args, int);
			while (--field_width > 0)
				*str++ = ' ';
			continue;

		case 's':
			s = va_arg(args, char *);
			if (!s)
				s = "<NULL>";

			len = MK_Strnlen(s, precision);

			if (!(flags & LEFT))
				while (len < field_width--)
					*str++ = ' ';
			for (i = 0; i < len; ++i)
				*str++ = *s++;
			while (len < field_width--)
				*str++ = ' ';
			continue;

		case 'p':
			if (field_width == -1) {
				field_width = 2*sizeof(void *);
				flags |= ZEROPAD;
			}
			str = MK_Number(str,
				(unsigned long) va_arg(args, void *), 16,
				field_width, precision, flags);
			continue;


		case 'n':
			if (qualifier == 'l') {
				long * ip = va_arg(args, long *);
				*ip = (str - buf);
			} else {
				int * ip = va_arg(args, int *);
				*ip = (str - buf);
			}
			continue;

		case '%':
			*str++ = '%';
			continue;

		/* integer MK_Number formats - set up the flags and "break" */
		case 'o':
			base = 8;
			break;

		case 'X':
			flags |= LARGE;
		case 'x':
			base = 16;
			break;

		case 'd':
		case 'i':
			flags |= SIGN;
		case 'u':
			break;

		default:
			*str++ = '%';
			if (*fmt)
				*str++ = *fmt;
			else
				--fmt;
			continue;
		}
		if (qualifier == 'l')
			num = va_arg(args, unsigned long);
		else if (qualifier == 'h') {
			num = (unsigned short) va_arg(args, int);
			if (flags & SIGN)
				num = (short) num;
		} else if (flags & SIGN)
			num = va_arg(args, int);
		else
			num = va_arg(args, unsigned int);
		str = MK_Number(str, num, base, field_width, precision, flags);
	}
	*str = '\0';
	return str-buf;
}

int 
MK_Sprintf(char * buf, char *fmt, ...)
{
	va_list args;
	int i;

	va_start(args, fmt);
	i=MK_VSprintf(buf,fmt,args);
	va_end(args);

	return i;
}


#endif /* 0 */