snprintf.cc

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	}
}

/* Have to handle DP_F_NUM (ie 0x and 0 alternates) */

static void fmtint(char *buffer, size_t *currlen, size_t maxlen,
				long value, int base, int min, int max, int flags)
{
#define MAX_CONVERT_PLACES 40
	int signvalue = 0;
	unsigned long uvalue;
	char convert[MAX_CONVERT_PLACES];
	int place = 0;
	int spadlen = 0; /* amount to space pad */
	int zpadlen = 0; /* amount to zero pad */
	int caps = 0;

	if (max < 0)
		max = 0;

	uvalue = value;

	if (!(flags & DP_F_UNSIGNED)) {
		if (value < 0) {
			signvalue = '-';
			uvalue = -value;
		} else {
			if (flags & DP_F_PLUS)  /* Do a sign (+/i) */
				signvalue = '+';
			else if (flags & DP_F_SPACE)
				signvalue = ' ';
		}
	}

	if (flags & DP_F_UP) caps = 1; /* Should characters be upper case? */

	do {
		convert[place++] =
			(caps? "0123456789ABCDEF":"0123456789abcdef")[uvalue % (unsigned)base];
		uvalue = (uvalue / (unsigned)base );
	} while (uvalue && (place < MAX_CONVERT_PLACES));
	if (place == MAX_CONVERT_PLACES) place--;
	convert[place] = 0;

	zpadlen = max - place;
	spadlen = min - MAX (max, place) - (signvalue ? 1 : 0);
	if (zpadlen < 0) zpadlen = 0;
	if (spadlen < 0) spadlen = 0;
	if (flags & DP_F_ZERO) {
		zpadlen = MAX(zpadlen, spadlen);
		spadlen = 0;
	}
	if (flags & DP_F_MINUS)
		spadlen = -spadlen; /* Left Justifty */

#ifdef DEBUG_SNPRINTF
	printf("zpad: %d, spad: %d, min: %d, max: %d, place: %d\n",
	zpadlen, spadlen, min, max, place);
#endif

	/* Spaces */
	while (spadlen > 0) {
		dopr_outch(buffer, currlen, maxlen, ' ');
		--spadlen;
	}

	/* Sign */
	if (signvalue) dopr_outch(buffer, currlen, maxlen, signvalue);

	/* Zeros */
	if (zpadlen > 0) {
		while (zpadlen > 0) {
			dopr_outch(buffer, currlen, maxlen, '0');
			--zpadlen;
		}
	}

	/* Digits */
	while (place > 0) dopr_outch(buffer, currlen, maxlen, convert[--place]);

	/* Left Justified spaces */
	while (spadlen < 0) {
		dopr_outch(buffer, currlen, maxlen, ' ');
		++spadlen;
	}
}

static void fmtqword(char *buffer, size_t *currlen, size_t maxlen,
				sint64 value, int base, int min, int max, int flags)
{
#undef MAX_CONVERT_PLACES
#define MAX_CONVERT_PLACES 80
	int signvalue = 0;
	uint64 uvalue;
	char convert[MAX_CONVERT_PLACES];
	int place = 0;
	int spadlen = 0; /* amount to space pad */
	int zpadlen = 0; /* amount to zero pad */
	int caps = 0;

	if (max < 0) max = 0;

	uvalue = value;

	if (!(flags & DP_F_UNSIGNED)) {
		if (value < 0) {
			signvalue = '-';
			uvalue = -uvalue;
		} else {
			if (flags & DP_F_PLUS) /* Do a sign (+/i) */
				signvalue = '+';
			else if (flags & DP_F_SPACE)
				signvalue = ' ';
		}
	}

	if (flags & DP_F_UP) caps = 1; /* Should characters be upper case? */

	do {
		uint64 uv = uvalue % (uint64)base;
		convert[place++] =
			(caps? "0123456789ABCDEF":"0123456789abcdef")[uv];
		uvalue = (uvalue / (uint64)base);
	} while ((uvalue != 0) && (place < MAX_CONVERT_PLACES));
	if (place == MAX_CONVERT_PLACES) place--;
	convert[place] = 0;

	zpadlen = max - place;
	spadlen = min - MAX (max, place) - (signvalue ? 1 : 0);
	if (zpadlen < 0) zpadlen = 0;
	if (spadlen < 0) spadlen = 0;
	if (flags & DP_F_ZERO) {
		zpadlen = MAX(zpadlen, spadlen);
		spadlen = 0;
	}
	if (flags & DP_F_MINUS) spadlen = -spadlen; /* Left Justifty */

#ifdef DEBUG_SNPRINTF
	printf("zpad: %d, spad: %d, min: %d, max: %d, place: %d\n",
	zpadlen, spadlen, min, max, place);
#endif

	/* Spaces */
	while (spadlen > 0) {
		dopr_outch(buffer, currlen, maxlen, ' ');
		--spadlen;
	}

	/* Sign */
	if (signvalue) dopr_outch(buffer, currlen, maxlen, signvalue);

	/* Zeros */
	if (zpadlen > 0) {
		while (zpadlen > 0) {
			dopr_outch(buffer, currlen, maxlen, '0');
			--zpadlen;
		}
	}

	/* Digits */
	while (place > 0) dopr_outch(buffer, currlen, maxlen, convert[--place]);

	/* Left Justified spaces */
	while (spadlen < 0) {
		dopr_outch(buffer, currlen, maxlen, ' ');
		++spadlen;
	}
}

static LDOUBLE abs_val(LDOUBLE value)
{
	return (value < 0) ? -value : value;
}

static LDOUBLE POW10(int exp)
{
	LDOUBLE result = 1;
	   
	while (exp) {
		result *= 10;
		exp--;
	}
  
	return result;
}

static LLONG ROUND(LDOUBLE value)
{
	LLONG intpart;

	intpart = (LLONG)value;
	value = value - intpart;
	if (value >= 0.5) intpart++;

	return intpart;
}

/* a replacement for modf that doesn't need the math library. Should
   be portable, but slow */
static double my_modf(double x0, double *iptr)
{
	int i;
	long l;
	double x = x0;
	double f = 1.0;

	for (i=0;i<100;i++) {
		l = (long)x;
		if (l <= (x+1) && l >= (x-1)) break;
		x *= 0.1;
		f *= 10.0;
	}

	if (i == 100) {
		/* yikes! the number is beyond what we can handle. What do we do? */
		(*iptr) = 0;
		return 0;
	}

	if (i != 0) {
		double i2;
		double ret;

		ret = my_modf(x0-l*f, &i2);
		(*iptr) = l*f + i2;
		return ret;
	}

	(*iptr) = l;
	return x - (*iptr);
}


static void fmtfp (char *buffer, size_t *currlen, size_t maxlen,
			    LDOUBLE fvalue, int min, int max, int flags)
{
	   int signvalue = 0;
	   double ufvalue;
	   char iconvert[311];
	   char fconvert[311];
	   int iplace = 0;
	   int fplace = 0;
	   int padlen = 0; /* amount to pad */
	   int zpadlen = 0; 
	   int caps = 0;
	   int index;
	   double intpart;
	   double fracpart;
	   double temp;
  
	   /* 
	    * AIX manpage says the default is 0, but Solaris says the default
	    * is 6, and sprintf on AIX defaults to 6
	    */
	   if (max < 0)
			 max = 6;

	   ufvalue = abs_val (fvalue);

	   if (fvalue < 0) {
			 signvalue = '-';
	   } else {
			 if (flags & DP_F_PLUS) { /* Do a sign (+/i) */
				    signvalue = '+';
			 } else {
				    if (flags & DP_F_SPACE)
						  signvalue = ' ';
			 }
	   }

#if 0
	   if (flags & DP_F_UP) caps = 1; /* Should characters be upper case? */
#endif

#if 0
	    if (max == 0) ufvalue += 0.5; /* if max = 0 we must round */
#endif

	   /* 
	    * Sorry, we only support 16 digits past the decimal because of our 
	    * conversion method
	    */
	   if (max > 16)
			 max = 16;

	   /* We "cheat" by converting the fractional part to integer by
	    * multiplying by a factor of 10
	    */

	   temp = ufvalue;
	   my_modf(temp, &intpart);

	   fracpart = ROUND((POW10(max)) * (ufvalue - intpart));
	   
	   if (fracpart >= POW10(max)) {
			 intpart++;
			 fracpart -= POW10(max);
	   }


	   /* Convert integer part */
	   do {
			 temp = intpart;
			 my_modf(intpart*0.1, &intpart);
			 temp = temp*0.1;
			 index = (int) ((temp -intpart +0.05)* 10.0);
			 /* index = (int) (((double)(temp*0.1) -intpart +0.05) *10.0); */
			 /* printf ("%llf, %f, %x\n", temp, intpart, index); */
			 iconvert[iplace++] =
				    (caps? "0123456789ABCDEF":"0123456789abcdef")[index];
	   } while (intpart && (iplace < 311));
	   if (iplace == 311) iplace--;
	   iconvert[iplace] = 0;

	   /* Convert fractional part */
	   if (fracpart)
	   {
			 do {
				    temp = fracpart;
				    my_modf(fracpart*0.1, &fracpart);
				    temp = temp*0.1;
				    index = (int) ((temp -fracpart +0.05)* 10.0);
				    /* index = (int) ((((temp/10) -fracpart) +0.05) *10); */
				    /* printf ("%lf, %lf, %ld\n", temp, fracpart, index); */
				    fconvert[fplace++] =
				    (caps? "0123456789ABCDEF":"0123456789abcdef")[index];
			 } while(fracpart && (fplace < 311));
			 if (fplace == 311) fplace--;
	   }
	   fconvert[fplace] = 0;
  
	   /* -1 for decimal point, another -1 if we are printing a sign */
	   padlen = min - iplace - max - 1 - ((signvalue) ? 1 : 0); 
	   zpadlen = max - fplace;
	   if (zpadlen < 0) zpadlen = 0;
	   if (padlen < 0) 
			 padlen = 0;
	   if (flags & DP_F_MINUS) 
			 padlen = -padlen; /* Left Justifty */
	   
	   if ((flags & DP_F_ZERO) && (padlen > 0)) {
			 if (signvalue) {
				    dopr_outch(buffer, currlen, maxlen, signvalue);
				    --padlen;
				    signvalue = 0;
			 }
			 while (padlen > 0) {
				    dopr_outch(buffer, currlen, maxlen, '0');
				    --padlen;
			 }
	   }
	   while (padlen > 0) {
			 dopr_outch(buffer, currlen, maxlen, ' ');
			 --padlen;
	   }
	   if (signvalue) 
			 dopr_outch(buffer, currlen, maxlen, signvalue);
	   
	   while (iplace > 0) 
			 dopr_outch(buffer, currlen, maxlen, iconvert[--iplace]);

#ifdef DEBUG_SNPRINTF
	   printf("fmtfp: fplace=%d zpadlen=%d\n", fplace, zpadlen);
#endif

	   /*
	    * Decimal point.  This should probably use locale to find the correct
	    * char to print out.
	    */
	   if (max > 0) {
			 dopr_outch(buffer, currlen, maxlen, '.');
			 
			 while (fplace > 0) 
				    dopr_outch(buffer, currlen, maxlen, fconvert[--fplace]);
	   }
	   
	   while (zpadlen > 0) {
			 dopr_outch(buffer, currlen, maxlen, '0');
			 --zpadlen;
	   }

	   while (padlen < 0) {
			 dopr_outch(buffer, currlen, maxlen, ' ');
			 ++padlen;
	   }
}

static void dopr_outch(char *buffer, size_t *currlen, size_t maxlen, char c)
{
	if (*currlen < maxlen) {
		buffer[(*currlen)] = c;
	}
	(*currlen)++;
}

int ht_vsnprintf (char *str, size_t count, const char *fmt, va_list args)
{
	if ((int)count < 0) count = 0;
	int res = dopr(str, count, fmt, args);
	if (count) count--;
	return str ? MIN(res, (int)count) : count;
}

int ht_snprintf(char *str, size_t count, const char *fmt,...)
{
	int ret;
	va_list ap;

	va_start(ap, fmt);
	ret = ht_vsnprintf(str, count, fmt, ap);
	va_end(ap);
	return ret;
}

int ht_vasprintf(char **ptr, const char *format, va_list ap)
{
	int ret;

	ret = dopr(NULL, 0, format, ap);
	if (ret <= 0) {
		*ptr = NULL;
		return 0;
	}

	(*ptr) = ht_malloc(ret+1);
	if (!*ptr) return 0;
	ret = ht_vsnprintf(*ptr, ret+1, format, ap);

	return ret;
}


int ht_asprintf(char **ptr, const char *format, ...)
{
	va_list ap;
	int ret;

	va_start(ap, format);
	ret = ht_vasprintf(ptr, format, ap);
	va_end(ap);

	return ret;
}

int ht_vfprintf(FILE *file, const char *fmt, va_list args)
{
#if 0
	char *buf;
	int ret = ht_vasprintf(&buf, fmt, args);
	fputs(buf, file);
	free(buf);
#else
	char buf[10024];
	int ret = ht_vsnprintf(buf, sizeof buf, fmt, args);
	fputs(buf, file);
#endif
	return ret;
}

int ht_fprintf(FILE *file, const char *fmt, ...)
{
	va_list ap;
	int ret;

	va_start(ap, fmt);
	ret = ht_vfprintf(file, fmt, ap);
	va_end(ap);

	return ret;
}


int ht_vprintf(const char *fmt, va_list args)
{
	return ht_vfprintf(stdout, fmt, args);
}

int ht_printf(const char *fmt, ...)
{
	va_list ap;
	int ret;

	va_start(ap, fmt);
	ret = ht_vprintf(fmt, ap);
	va_end(ap);

	return ret;
}