vfwprint.c

winNT技术操作系统,国外开放的原代码和LIUX一样

/* Copyright (C) 1994 DJ Delorie, see COPYING.DJ for details */

#include <precomp.h>

int
__vfwprintf(FILE *fp, const wchar_t *fmt0, va_list argp);


/*
 * @implemented
 */
int
vfwprintf(FILE *f, const wchar_t *fmt, va_list ap)
{
	int len;
	wchar_t localbuf[BUFSIZ];

#if 0
	__fileno_lock(_fileno(f));
#endif
	if (f->_flag & _IONBF) {
		f->_flag &= ~_IONBF;
		f->_ptr = f->_base = (char *)localbuf;
		f->_bufsiz = BUFSIZ;
		len = __vfwprintf(f,fmt,ap);
		(void)fflush(f);
		f->_flag |= _IONBF;
		f->_base = NULL;
		f->_bufsiz = 0;
		f->_cnt = 0;
	} else
		len = __vfwprintf(f,fmt,ap);
#if 0
	__fileno_unlock(_fileno(f));
#endif
	return (ferror(f) ? EOF : len);
}



/*
 *  linux/lib/vsprintf.c
 *
 *  Copyright (C) 1991, 1992  Linus Torvalds
 */

/* vsprintf.c -- Lars Wirzenius & Linus Torvalds. */
/*
 * Wirzenius wrote this portably, Torvalds fucked it up :-)
 */

/*
 * Appropiated for the reactos kernel, March 1998 -- David Welch
 */

#include <math.h>
#include <internal/ieee.h>

#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' */
#define ZEROTRUNC	128	/* truncate zero 's */


static int skip_wtoi(const wchar_t **s)
{
	int i=0;

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


static int do_div(LONGLONG *n,int base)
{
	int __res = ((ULONGLONG) *n) % (unsigned) base;
	*n = ((ULONGLONG) *n) / (unsigned) base;
	return __res;
}


static int number(FILE * f, LONGLONG num, int base, int size, int precision ,int type)
{
	wchar_t c,sign,tmp[66];
	const wchar_t *digits=L"0123456789abcdefghijklmnopqrstuvwxyz";
	int i, done = 0;

	if (type & LARGE)
		digits = L"0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
	if (type & LEFT)
		type &= ~ZEROPAD;
	if (base < 2 || base > 36)
		return done;
	c = (type & ZEROPAD) ? L'0' : L' ';
	sign = 0;
	if (type & SIGN) {
		if (num < 0) {
			sign = L'-';
			num = -num;
			size--;
		} else if (type & PLUS) {
			sign = L'+';
			size--;
		} else if (type & SPACE) {
			sign = L' ';
			size--;
		}
	}
	if (type & SPECIAL) {
		if (base == 16)
			size -= 2;
		else if (base == 8)
			size--;
	}
	i = 0;
	if (num == 0)
		tmp[i++]=L'0';
	else while (num != 0)
		tmp[i++] = digits[do_div(&num,base)];
	if (i > precision)
		precision = i;
	size -= precision;
	if (!(type&(ZEROPAD+LEFT)))
		while(size-->0)
		{
			if (putwc(L' ',f) == WEOF)
				return -1;
			done++;
		}

	if (sign)
	{
		if (putwc(sign,f) == WEOF)
			return -1;
		done++;
	}
	if (type & SPECIAL) {
		if (base==8) {
			if (putwc(L'0',f) == WEOF)
				return -1;
			done++;
		}
		else if (base==16) {
		    	if (putwc(L'0', f) == WEOF)
				return -1;
			done++;
			if (putwc(digits[33],f) == WEOF)
				return -1;
			done++;
		}
	}
	if (!(type & LEFT))
		while (size-- > 0)
		{
			if (putwc(c,f) == WEOF)
				return -1;
			done++;
		}
	while (i < precision--)
	{
		if (putwc(L'0', f) == WEOF)
			return -1;
		done++;
	}
	while (i-- > 0)
	{
		if (putwc(tmp[i],f) == WEOF)
			return -1;
		done++;
	}
	while (size-- > 0)
	{
		if (putwc(L' ', f) == WEOF)
			return -1;
		done++;
	}
	return done;
}


static int numberf(FILE * f, double __n, wchar_t exp_sign,  int size, int precision, int type)
{
	double exponent = 0.0;
	double e;
	long ie;

	//int x;
	char *buf, *tmp;
	int i = 0;
	int j = 0;
	//int k = 0;

	double frac, intr;
	double p;
	wchar_t sign;
	wchar_t c;
	char ro = 0;
	int result, done = 0;

	union
	{
	    double*   __n;
	    double_t*   n;
	} n;

	n.__n = &__n;
 
    if ( exp_sign == L'g' || exp_sign == L'G' || exp_sign == L'e' || exp_sign == L'E' ) 
    {
        if ( 0 == n.n->mantissal && 0 == n.n->mantissah && 0 == n.n->exponent )
        {
            ie = 0;
        }
        else
        {
            ie = ((unsigned int)n.n->exponent - (unsigned int)0x3ff);
        }

        exponent = ie/3.321928;
    }


	if ( exp_sign == L'g' || exp_sign == L'G' ) {
		type |= ZEROTRUNC;
		if ( exponent < -4 || fabs(exponent) >= precision )
			 exp_sign -= 2; // g -> e and G -> E
		else
		         exp_sign = 'f';
	}

	if ( exp_sign == L'e' ||  exp_sign == L'E' ) {
		frac = modf(exponent,&e);
		if ( frac > 0.5 )
			e++;
		else if ( frac < -0.5 )
			e--;

		result = numberf(f,__n/pow(10.0L,e),L'f',size-4, precision, type);
		if (result < 0)
			return -1;
		done += result;
		if (putwc( exp_sign,f) == WEOF)
			return -1;
		done++;
		size--;
		ie = (long)e;
		type = LEFT | PLUS;
		if ( ie < 0 )
			type |= SIGN;

		result = number(f,ie, 10,2, 2,type );
		if (result < 0)
			return -1;
		done += result;
		return done;
	}

	if ( exp_sign == 'f' ) {
		buf = alloca(4096);
		if (type & LEFT) {
			type &= ~ZEROPAD;
		}

		c = (type & ZEROPAD) ? L'0' : L' ';
		sign = 0;
		if (type & SIGN) {
			if (__n < 0) {
				sign = L'-';
				__n = fabs(__n);
				size--;
			} else if (type & PLUS) {
				sign = L'+';
				size--;
			} else if (type & SPACE) {
				sign = L' ';
				size--;
			}
		}

		frac = modf(__n,&intr);

		// # flags forces a . and prevents trucation of trailing zero's

		if ( precision > 0 ) {
			//frac = modfl(__n,&intr);
			i = precision-1;
			while ( i >= 0  ) {
				frac*=10.0L;
				frac = modf(frac, &p);
				buf[i] = (int)p + L'0';
				i--;
			}
			i = precision;
			size -= precision;

			ro = 0;
			if ( frac > 0.5 ) {
				ro = 1;
			}

			if ( precision >= 1 || type & SPECIAL) {
				buf[i++] = '.';
				size--;
			}
		}

		if ( intr == 0.0 ) {
			buf[i++] = L'0';
			size--;
		}
		else {
			while ( intr > 0.0 ) {
				p = intr;
                                intr/=10.0L;
				modf(intr, &intr);

				p -= 10.0*intr;

				buf[i++] = (int)p + L'0';
				size--;
			}
		}

		j = 0;
		while ( j < i && ro == 1 ) {
			if ( buf[j] >= L'0' && buf[j] <= L'8' ) {
				buf[j]++;
				ro = 0;
			}
			else if ( buf[j] == L'9' ) {
				buf[j] = L'0';
			}
			j++;
		}
		if ( ro == 1 )
			buf[i++] = L'1';

		buf[i] = 0;

		size -= precision;
		if (!(type&(ZEROPAD+LEFT)))
			while(size-->0)
			{
				if (putwc(L' ',f) == WEOF)
					return -1;
				done++;
			}
		if (sign)
		{
			if (putwc( sign,f) == WEOF)
				return -1;
			done++;
		}

		if (!(type&(ZEROPAD+LEFT)))
			while(size-->0)
			{
				if (putwc(L' ',f) == WEOF)
					return -1;
				done++;
			}
		if (type & SPECIAL) {
		}

		if (!(type & LEFT))
			while (size-- > 0)
			{
				if (putwc(c,f) == WEOF)
					return -1;
				done++;
			}

		tmp = buf;
		if ( type & ZEROTRUNC && ((type & SPECIAL) != SPECIAL) ) {
			j = 0;
			while ( j < i && *tmp == L'0' ) {
					tmp++;
					i--;
			}
			if ( j < i && *tmp == L'.' ) {
					tmp++;
					i--;
			}
		}
//		else
//			while (i < precision--)
//				putwc(L'0', f);
		while (i-- > 0)
		{
			if (putwc(tmp[i],f) == WEOF)
				return -1;
			done++;
		}
		while (size-- > 0)
		{
			if (putwc(L' ', f) == WEOF)
				return -1;
			done++;
		}
	}
	return done;
}



static int string(FILE *f, const char* s, int len, int field_width, int precision, int flags)
{
	int i, done = 0;
	if (s == NULL)
	{
		s = "<NULL>";
		len = 6;
	}
	else
	{
		if (len == -1)
		{
			len = 0;
			while ((unsigned int)len < (unsigned int)precision && s[len])