[fusl] clang-format fusl

fusl/src/stdio/vfprintf.c

Index: fusl/src/stdio/vfprintf.c
diff --git a/fusl/src/stdio/vfprintf.c b/fusl/src/stdio/vfprintf.c
index 5724bf310abb50633ea80b5887e6734c799aec48..008fe11d2b08f3d6516e0072700524b37b2fe95d 100644
--- a/fusl/src/stdio/vfprintf.c
+++ b/fusl/src/stdio/vfprintf.c
@@ -11,20 +11,20 @@
 
 /* Some useful macros */
 
-#define MAX(a,b) ((a)>(b) ? (a) : (b))
-#define MIN(a,b) ((a)<(b) ? (a) : (b))
+#define MAX(a, b) ((a) > (b) ? (a) : (b))
+#define MIN(a, b) ((a) < (b) ? (a) : (b))
 
 /* Convenient bit representation for modifier flags, which all fall
  * within 31 codepoints of the space character. */
 
-#define ALT_FORM   (1U<<('#'-' '))
-#define ZERO_PAD   (1U<<('0'-' '))
-#define LEFT_ADJ   (1U<<('-'-' '))
-#define PAD_POS    (1U<<(' '-' '))
-#define MARK_POS   (1U<<('+'-' '))
-#define GROUPED    (1U<<('\''-' '))
+#define ALT_FORM (1U << ('#' - ' '))
+#define ZERO_PAD (1U << ('0' - ' '))
+#define LEFT_ADJ (1U << ('-' - ' '))
+#define PAD_POS (1U << (' ' - ' '))
+#define MARK_POS (1U << ('+' - ' '))
+#define GROUPED (1U << ('\'' - ' '))
 
-#define FLAGMASK (ALT_FORM|ZERO_PAD|LEFT_ADJ|PAD_POS|MARK_POS|GROUPED)
+#define FLAGMASK (ALT_FORM | ZERO_PAD | LEFT_ADJ | PAD_POS | MARK_POS | GROUPED)
 
 #if UINT_MAX == ULONG_MAX
 #define LONG_IS_INT
@@ -38,19 +38,37 @@
  * Result is 0 on failure, or an argument type to pop on success. */
 
 enum {
-	BARE, LPRE, LLPRE, HPRE, HHPRE, BIGLPRE,
-	ZTPRE, JPRE,
-	STOP,
-	PTR, INT, UINT, ULLONG,
+  BARE,
+  LPRE,
+  LLPRE,
+  HPRE,
+  HHPRE,
+  BIGLPRE,
+  ZTPRE,
+  JPRE,
+  STOP,
+  PTR,
+  INT,
+  UINT,
+  ULLONG,
 #ifndef LONG_IS_INT
-	LONG, ULONG,
+  LONG,
+  ULONG,
 #else
 #define LONG INT
 #define ULONG UINT
 #endif
-	SHORT, USHORT, CHAR, UCHAR,
+  SHORT,
+  USHORT,
+  CHAR,
+  UCHAR,
 #ifdef ODD_TYPES
-	LLONG, SIZET, IMAX, UMAX, PDIFF, UIPTR,
+  LLONG,
+  SIZET,
+  IMAX,
+  UMAX,
+  PDIFF,
+  UIPTR,
 #else
 #define LLONG ULLONG
 #define SIZET ULONG
@@ -59,633 +77,783 @@ enum {
 #define PDIFF LONG
 #define UIPTR ULONG
 #endif
-	DBL, LDBL,
-	NOARG,
-	MAXSTATE
+  DBL,
+  LDBL,
+  NOARG,
+  MAXSTATE
 };
 
-#define S(x) [(x)-'A']
-
-static const unsigned char states[]['z'-'A'+1] = {
-	{ /* 0: bare types */
-		S('d') = INT, S('i') = INT,
-		S('o') = UINT, S('u') = UINT, S('x') = UINT, S('X') = UINT,
-		S('e') = DBL, S('f') = DBL, S('g') = DBL, S('a') = DBL,
-		S('E') = DBL, S('F') = DBL, S('G') = DBL, S('A') = DBL,
-		S('c') = CHAR, S('C') = INT,
-		S('s') = PTR, S('S') = PTR, S('p') = UIPTR, S('n') = PTR,
-		S('m') = NOARG,
-		S('l') = LPRE, S('h') = HPRE, S('L') = BIGLPRE,
-		S('z') = ZTPRE, S('j') = JPRE, S('t') = ZTPRE,
-	}, { /* 1: l-prefixed */
-		S('d') = LONG, S('i') = LONG,
-		S('o') = ULONG, S('u') = ULONG, S('x') = ULONG, S('X') = ULONG,
-		S('e') = DBL, S('f') = DBL, S('g') = DBL, S('a') = DBL,
-		S('E') = DBL, S('F') = DBL, S('G') = DBL, S('A') = DBL,
-		S('c') = INT, S('s') = PTR, S('n') = PTR,
-		S('l') = LLPRE,
-	}, { /* 2: ll-prefixed */
-		S('d') = LLONG, S('i') = LLONG,
-		S('o') = ULLONG, S('u') = ULLONG,
-		S('x') = ULLONG, S('X') = ULLONG,
-		S('n') = PTR,
-	}, { /* 3: h-prefixed */
-		S('d') = SHORT, S('i') = SHORT,
-		S('o') = USHORT, S('u') = USHORT,
-		S('x') = USHORT, S('X') = USHORT,
-		S('n') = PTR,
-		S('h') = HHPRE,
-	}, { /* 4: hh-prefixed */
-		S('d') = CHAR, S('i') = CHAR,
-		S('o') = UCHAR, S('u') = UCHAR,
-		S('x') = UCHAR, S('X') = UCHAR,
-		S('n') = PTR,
-	}, { /* 5: L-prefixed */
-		S('e') = LDBL, S('f') = LDBL, S('g') = LDBL, S('a') = LDBL,
-		S('E') = LDBL, S('F') = LDBL, S('G') = LDBL, S('A') = LDBL,
-		S('n') = PTR,
-	}, { /* 6: z- or t-prefixed (assumed to be same size) */
-		S('d') = PDIFF, S('i') = PDIFF,
-		S('o') = SIZET, S('u') = SIZET,
-		S('x') = SIZET, S('X') = SIZET,
-		S('n') = PTR,
-	}, { /* 7: j-prefixed */
-		S('d') = IMAX, S('i') = IMAX,
-		S('o') = UMAX, S('u') = UMAX,
-		S('x') = UMAX, S('X') = UMAX,
-		S('n') = PTR,
-	}
+#define S(x) [(x) - 'A']
+
+static const unsigned char states[]['z' - 'A' + 1] = {
+    {
+        /* 0: bare types */
+        S('d') = INT,   S('i') = INT,  S('o') = UINT,  S('u') = UINT,
+        S('x') = UINT,  S('X') = UINT, S('e') = DBL,   S('f') = DBL,
+        S('g') = DBL,   S('a') = DBL,  S('E') = DBL,   S('F') = DBL,
+        S('G') = DBL,   S('A') = DBL,  S('c') = CHAR,  S('C') = INT,
+        S('s') = PTR,   S('S') = PTR,  S('p') = UIPTR, S('n') = PTR,
+        S('m') = NOARG, S('l') = LPRE, S('h') = HPRE,  S('L') = BIGLPRE,
+        S('z') = ZTPRE, S('j') = JPRE, S('t') = ZTPRE,
+    },
+    {
+        /* 1: l-prefixed */
+        S('d') = LONG, S('i') = LONG, S('o') = ULONG, S('u') = ULONG,
+        S('x') = ULONG, S('X') = ULONG, S('e') = DBL, S('f') = DBL,
+        S('g') = DBL, S('a') = DBL, S('E') = DBL, S('F') = DBL, S('G') = DBL,
+        S('A') = DBL, S('c') = INT, S('s') = PTR, S('n') = PTR, S('l') = LLPRE,
+    },
+    {
+        /* 2: ll-prefixed */
+        S('d') = LLONG, S('i') = LLONG, S('o') = ULLONG, S('u') = ULLONG,
+        S('x') = ULLONG, S('X') = ULLONG, S('n') = PTR,
+    },
+    {
+        /* 3: h-prefixed */
+        S('d') = SHORT, S('i') = SHORT, S('o') = USHORT, S('u') = USHORT,
+        S('x') = USHORT, S('X') = USHORT, S('n') = PTR, S('h') = HHPRE,
+    },
+    {
+        /* 4: hh-prefixed */
+        S('d') = CHAR, S('i') = CHAR, S('o') = UCHAR, S('u') = UCHAR,
+        S('x') = UCHAR, S('X') = UCHAR, S('n') = PTR,
+    },
+    {
+        /* 5: L-prefixed */
+        S('e') = LDBL, S('f') = LDBL, S('g') = LDBL, S('a') = LDBL,
+        S('E') = LDBL, S('F') = LDBL, S('G') = LDBL, S('A') = LDBL,
+        S('n') = PTR,
+    },
+    {
+        /* 6: z- or t-prefixed (assumed to be same size) */
+        S('d') = PDIFF, S('i') = PDIFF, S('o') = SIZET, S('u') = SIZET,
+        S('x') = SIZET, S('X') = SIZET, S('n') = PTR,
+    },
+    {
+        /* 7: j-prefixed */
+        S('d') = IMAX, S('i') = IMAX, S('o') = UMAX, S('u') = UMAX,
+        S('x') = UMAX, S('X') = UMAX, S('n') = PTR,
+    }};
+
+#define OOB(x) ((unsigned)(x) - 'A' > 'z' - 'A')
+
+union arg {
+  uintmax_t i;
+  long double f;
+  void* p;
 };
 
-#define OOB(x) ((unsigned)(x)-'A' > 'z'-'A')
-
-union arg
-{
-	uintmax_t i;
-	long double f;
-	void *p;
-};
-
-static void pop_arg(union arg *arg, int type, va_list *ap)
-{
-	/* Give the compiler a hint for optimizing the switch. */
-	if ((unsigned)type > MAXSTATE) return;
-	switch (type) {
-	       case PTR:	arg->p = va_arg(*ap, void *);
-	break; case INT:	arg->i = va_arg(*ap, int);
-	break; case UINT:	arg->i = va_arg(*ap, unsigned int);
+static void pop_arg(union arg* arg, int type, va_list* ap) {
+  /* Give the compiler a hint for optimizing the switch. */
+  if ((unsigned)type > MAXSTATE)
+    return;
+  switch (type) {
+    case PTR:
+      arg->p = va_arg(*ap, void*);
+      break;
+    case INT:
+      arg->i = va_arg(*ap, int);
+      break;
+    case UINT:
+      arg->i = va_arg(*ap, unsigned int);
 #ifndef LONG_IS_INT
-	break; case LONG:	arg->i = va_arg(*ap, long);
-	break; case ULONG:	arg->i = va_arg(*ap, unsigned long);
+      break;
+    case LONG:
+      arg->i = va_arg(*ap, long);
+      break;
+    case ULONG:
+      arg->i = va_arg(*ap, unsigned long);
 #endif
-	break; case ULLONG:	arg->i = va_arg(*ap, unsigned long long);
-	break; case SHORT:	arg->i = (short)va_arg(*ap, int);
-	break; case USHORT:	arg->i = (unsigned short)va_arg(*ap, int);
-	break; case CHAR:	arg->i = (signed char)va_arg(*ap, int);
-	break; case UCHAR:	arg->i = (unsigned char)va_arg(*ap, int);
+      break;
+    case ULLONG:
+      arg->i = va_arg(*ap, unsigned long long);
+      break;
+    case SHORT:
+      arg->i = (short)va_arg(*ap, int);
+      break;
+    case USHORT:
+      arg->i = (unsigned short)va_arg(*ap, int);
+      break;
+    case CHAR:
+      arg->i = (signed char)va_arg(*ap, int);
+      break;
+    case UCHAR:
+      arg->i = (unsigned char)va_arg(*ap, int);
 #ifdef ODD_TYPES
-	break; case LLONG:	arg->i = va_arg(*ap, long long);
-	break; case SIZET:	arg->i = va_arg(*ap, size_t);
-	break; case IMAX:	arg->i = va_arg(*ap, intmax_t);
-	break; case UMAX:	arg->i = va_arg(*ap, uintmax_t);
-	break; case PDIFF:	arg->i = va_arg(*ap, ptrdiff_t);
-	break; case UIPTR:	arg->i = (uintptr_t)va_arg(*ap, void *);
+      break;
+    case LLONG:
+      arg->i = va_arg(*ap, long long);
+      break;
+    case SIZET:
+      arg->i = va_arg(*ap, size_t);
+      break;
+    case IMAX:
+      arg->i = va_arg(*ap, intmax_t);
+      break;
+    case UMAX:
+      arg->i = va_arg(*ap, uintmax_t);
+      break;
+    case PDIFF:
+      arg->i = va_arg(*ap, ptrdiff_t);
+      break;
+    case UIPTR:
+      arg->i = (uintptr_t)va_arg(*ap, void*);
 #endif
-	break; case DBL:	arg->f = va_arg(*ap, double);
-	break; case LDBL:	arg->f = va_arg(*ap, long double);
-	}
+      break;
+    case DBL:
+      arg->f = va_arg(*ap, double);
+      break;
+    case LDBL:
+      arg->f = va_arg(*ap, long double);
+  }
 }
 
-static void out(FILE *f, const char *s, size_t l)
-{
-	if (!(f->flags & F_ERR)) __fwritex((void *)s, l, f);
+static void out(FILE* f, const char* s, size_t l) {
+  if (!(f->flags & F_ERR))
+    __fwritex((void*)s, l, f);
 }
 
-static void pad(FILE *f, char c, int w, int l, int fl)
-{
-	char pad[256];
-	if (fl & (LEFT_ADJ | ZERO_PAD) || l >= w) return;
-	l = w - l;
-	memset(pad, c, l>sizeof pad ? sizeof pad : l);
-	for (; l >= sizeof pad; l -= sizeof pad)
-		out(f, pad, sizeof pad);
-	out(f, pad, l);
+static void pad(FILE* f, char c, int w, int l, int fl) {
+  char pad[256];
+  if (fl & (LEFT_ADJ | ZERO_PAD) || l >= w)
+    return;
+  l = w - l;
+  memset(pad, c, l > sizeof pad ? sizeof pad : l);
+  for (; l >= sizeof pad; l -= sizeof pad)
+    out(f, pad, sizeof pad);
+  out(f, pad, l);
 }
 
-static const char xdigits[16] = {
-	"0123456789ABCDEF"
-};
+static const char xdigits[16] = {"0123456789ABCDEF"};
 
-static char *fmt_x(uintmax_t x, char *s, int lower)
-{
-	for (; x; x>>=4) *--s = xdigits[(x&15)]|lower;
-	return s;
+static char* fmt_x(uintmax_t x, char* s, int lower) {
+  for (; x; x >>= 4)
+    *--s = xdigits[(x & 15)] | lower;
+  return s;
 }
 
-static char *fmt_o(uintmax_t x, char *s)
-{
-	for (; x; x>>=3) *--s = '0' + (x&7);
-	return s;
+static char* fmt_o(uintmax_t x, char* s) {
+  for (; x; x >>= 3)
+    *--s = '0' + (x & 7);
+  return s;
 }
 
-static char *fmt_u(uintmax_t x, char *s)
-{
-	unsigned long y;
-	for (   ; x>ULONG_MAX; x/=10) *--s = '0' + x%10;
-	for (y=x;           y; y/=10) *--s = '0' + y%10;
-	return s;
+static char* fmt_u(uintmax_t x, char* s) {
+  unsigned long y;
+  for (; x > ULONG_MAX; x /= 10)
+    *--s = '0' + x % 10;
+  for (y = x; y; y /= 10)
+    *--s = '0' + y % 10;
+  return s;
 }
 
 /* Do not override this check. The floating point printing code below
  * depends on the float.h constants being right. If they are wrong, it
  * may overflow the stack. */
 #if LDBL_MANT_DIG == 53
-typedef char compiler_defines_long_double_incorrectly[9-(int)sizeof(long double)];
+typedef char
+    compiler_defines_long_double_incorrectly[9 - (int)sizeof(long double)];
 #endif
 
-static int fmt_fp(FILE *f, long double y, int w, int p, int fl, int t)
-{
-	uint32_t big[(LDBL_MANT_DIG+28)/29 + 1          // mantissa expansion
-		+ (LDBL_MAX_EXP+LDBL_MANT_DIG+28+8)/9]; // exponent expansion
-	uint32_t *a, *d, *r, *z;
-	int e2=0, e, i, j, l;
-	char buf[9+LDBL_MANT_DIG/4], *s;
-	const char *prefix="-0X+0X 0X-0x+0x 0x";
-	int pl;
-	char ebuf0[3*sizeof(int)], *ebuf=&ebuf0[3*sizeof(int)], *estr;
-
-	pl=1;
-	if (signbit(y)) {
-		y=-y;
-	} else if (fl & MARK_POS) {
-		prefix+=3;
-	} else if (fl & PAD_POS) {
-		prefix+=6;
-	} else prefix++, pl=0;
-
-	if (!isfinite(y)) {
-		char *s = (t&32)?"inf":"INF";
-		if (y!=y) s=(t&32)?"nan":"NAN";
-		pad(f, ' ', w, 3+pl, fl&~ZERO_PAD);
-		out(f, prefix, pl);
-		out(f, s, 3);
-		pad(f, ' ', w, 3+pl, fl^LEFT_ADJ);
-		return MAX(w, 3+pl);
-	}
-
-	y = frexpl(y, &e2) * 2;
-	if (y) e2--;
-
-	if ((t|32)=='a') {
-		long double round = 8.0;
-		int re;
-
-		if (t&32) prefix += 9;
-		pl += 2;
-
-		if (p<0 || p>=LDBL_MANT_DIG/4-1) re=0;
-		else re=LDBL_MANT_DIG/4-1-p;
-
-		if (re) {
-			while (re--) round*=16;
-			if (*prefix=='-') {
-				y=-y;
-				y-=round;
-				y+=round;
-				y=-y;
-			} else {
-				y+=round;
-				y-=round;
-			}
-		}
-
-		estr=fmt_u(e2<0 ? -e2 : e2, ebuf);
-		if (estr==ebuf) *--estr='0';
-		*--estr = (e2<0 ? '-' : '+');
-		*--estr = t+('p'-'a');
-
-		s=buf;
-		do {
-			int x=y;
-			*s++=xdigits[x]|(t&32);
-			y=16*(y-x);
-			if (s-buf==1 && (y||p>0||(fl&ALT_FORM))) *s++='.';
-		} while (y);
-
-		if (p && s-buf-2 < p)
-			l = (p+2) + (ebuf-estr);
-		else
-			l = (s-buf) + (ebuf-estr);
-
-		pad(f, ' ', w, pl+l, fl);
-		out(f, prefix, pl);
-		pad(f, '0', w, pl+l, fl^ZERO_PAD);
-		out(f, buf, s-buf);
-		pad(f, '0', l-(ebuf-estr)-(s-buf), 0, 0);
-		out(f, estr, ebuf-estr);
-		pad(f, ' ', w, pl+l, fl^LEFT_ADJ);
-		return MAX(w, pl+l);
-	}
-	if (p<0) p=6;
-
-	if (y) y *= 0x1p28, e2-=28;
-
-	if (e2<0) a=r=z=big;
-	else a=r=z=big+sizeof(big)/sizeof(*big) - LDBL_MANT_DIG - 1;
-
-	do {
-		*z = y;
-		y = 1000000000*(y-*z++);
-	} while (y);
-
-	while (e2>0) {
-		uint32_t carry=0;
-		int sh=MIN(29,e2);
-		for (d=z-1; d>=a; d--) {
-			uint64_t x = ((uint64_t)*d<<sh)+carry;
-			*d = x % 1000000000;
-			carry = x / 1000000000;
-		}
-		if (carry) *--a = carry;
-		while (z>a && !z[-1]) z--;
-		e2-=sh;
-	}
-	while (e2<0) {
-		uint32_t carry=0, *b;
-		int sh=MIN(9,-e2), need=1+(p+LDBL_MANT_DIG/3+8)/9;
-		for (d=a; d<z; d++) {
-			uint32_t rm = *d & (1<<sh)-1;
-			*d = (*d>>sh) + carry;
-			carry = (1000000000>>sh) * rm;
-		}
-		if (!*a) a++;
-		if (carry) *z++ = carry;
-		/* Avoid (slow!) computation past requested precision */
-		b = (t|32)=='f' ? r : a;
-		if (z-b > need) z = b+need;
-		e2+=sh;
-	}
-
-	if (a<z) for (i=10, e=9*(r-a); *a>=i; i*=10, e++);
-	else e=0;
-
-	/* Perform rounding: j is precision after the radix (possibly neg) */
-	j = p - ((t|32)!='f')*e - ((t|32)=='g' && p);
-	if (j < 9*(z-r-1)) {
-		uint32_t x;
-		/* We avoid C's broken division of negative numbers */
-		d = r + 1 + ((j+9*LDBL_MAX_EXP)/9 - LDBL_MAX_EXP);
-		j += 9*LDBL_MAX_EXP;
-		j %= 9;
-		for (i=10, j++; j<9; i*=10, j++);
-		x = *d % i;
-		/* Are there any significant digits past j? */
-		if (x || d+1!=z) {
-			long double round = 2/LDBL_EPSILON;
-			long double small;
-			if (*d/i & 1) round += 2;
-			if (x<i/2) small=0x0.8p0;
-			else if (x==i/2 && d+1==z) small=0x1.0p0;
-			else small=0x1.8p0;
-			if (pl && *prefix=='-') round*=-1, small*=-1;
-			*d -= x;
-			/* Decide whether to round by probing round+small */
-			if (round+small != round) {
-				*d = *d + i;
-				while (*d > 999999999) {
-					*d--=0;
-					if (d<a) *--a=0;
-					(*d)++;
-				}
-				for (i=10, e=9*(r-a); *a>=i; i*=10, e++);
-			}
-		}
-		if (z>d+1) z=d+1;
-	}
-	for (; z>a && !z[-1]; z--);
-	
-	if ((t|32)=='g') {
-		if (!p) p++;
-		if (p>e && e>=-4) {
-			t--;
-			p-=e+1;
-		} else {
-			t-=2;
-			p--;
-		}
-		if (!(fl&ALT_FORM)) {
-			/* Count trailing zeros in last place */
-			if (z>a && z[-1]) for (i=10, j=0; z[-1]%i==0; i*=10, j++);
-			else j=9;
-			if ((t|32)=='f')
-				p = MIN(p,MAX(0,9*(z-r-1)-j));
-			else
-				p = MIN(p,MAX(0,9*(z-r-1)+e-j));
-		}
-	}
-	l = 1 + p + (p || (fl&ALT_FORM));
-	if ((t|32)=='f') {
-		if (e>0) l+=e;
-	} else {
-		estr=fmt_u(e<0 ? -e : e, ebuf);
-		while(ebuf-estr<2) *--estr='0';
-		*--estr = (e<0 ? '-' : '+');
-		*--estr = t;
-		l += ebuf-estr;
-	}
-
-	pad(f, ' ', w, pl+l, fl);
-	out(f, prefix, pl);
-	pad(f, '0', w, pl+l, fl^ZERO_PAD);
-
-	if ((t|32)=='f') {
-		if (a>r) a=r;
-		for (d=a; d<=r; d++) {
-			char *s = fmt_u(*d, buf+9);
-			if (d!=a) while (s>buf) *--s='0';
-			else if (s==buf+9) *--s='0';
-			out(f, s, buf+9-s);
-		}
-		if (p || (fl&ALT_FORM)) out(f, ".", 1);
-		for (; d<z && p>0; d++, p-=9) {
-			char *s = fmt_u(*d, buf+9);
-			while (s>buf) *--s='0';
-			out(f, s, MIN(9,p));
-		}
-		pad(f, '0', p+9, 9, 0);
-	} else {
-		if (z<=a) z=a+1;
-		for (d=a; d<z && p>=0; d++) {
-			char *s = fmt_u(*d, buf+9);
-			if (s==buf+9) *--s='0';
-			if (d!=a) while (s>buf) *--s='0';
-			else {
-				out(f, s++, 1);
-				if (p>0||(fl&ALT_FORM)) out(f, ".", 1);
-			}
-			out(f, s, MIN(buf+9-s, p));
-			p -= buf+9-s;
-		}
-		pad(f, '0', p+18, 18, 0);
-		out(f, estr, ebuf-estr);
-	}
-
-	pad(f, ' ', w, pl+l, fl^LEFT_ADJ);
-
-	return MAX(w, pl+l);
+static int fmt_fp(FILE* f, long double y, int w, int p, int fl, int t) {
+  uint32_t
+      big[(LDBL_MANT_DIG + 28) / 29 + 1                    // mantissa expansion
+          + (LDBL_MAX_EXP + LDBL_MANT_DIG + 28 + 8) / 9];  // exponent expansion
+  uint32_t *a, *d, *r, *z;
+  int e2 = 0, e, i, j, l;
+  char buf[9 + LDBL_MANT_DIG / 4], *s;
+  const char* prefix = "-0X+0X 0X-0x+0x 0x";
+  int pl;
+  char ebuf0[3 * sizeof(int)], *ebuf = &ebuf0[3 * sizeof(int)], *estr;
+
+  pl = 1;
+  if (signbit(y)) {
+    y = -y;
+  } else if (fl & MARK_POS) {
+    prefix += 3;
+  } else if (fl & PAD_POS) {
+    prefix += 6;
+  } else
+    prefix++, pl = 0;
+
+  if (!isfinite(y)) {
+    char* s = (t & 32) ? "inf" : "INF";
+    if (y != y)
+      s = (t & 32) ? "nan" : "NAN";
+    pad(f, ' ', w, 3 + pl, fl & ~ZERO_PAD);
+    out(f, prefix, pl);
+    out(f, s, 3);
+    pad(f, ' ', w, 3 + pl, fl ^ LEFT_ADJ);
+    return MAX(w, 3 + pl);
+  }
+
+  y = frexpl(y, &e2) * 2;
+  if (y)
+    e2--;
+
+  if ((t | 32) == 'a') {
+    long double round = 8.0;
+    int re;
+
+    if (t & 32)
+      prefix += 9;
+    pl += 2;
+
+    if (p < 0 || p >= LDBL_MANT_DIG / 4 - 1)
+      re = 0;
+    else
+      re = LDBL_MANT_DIG / 4 - 1 - p;
+
+    if (re) {
+      while (re--)
+        round *= 16;
+      if (*prefix == '-') {
+        y = -y;
+        y -= round;
+        y += round;
+        y = -y;
+      } else {
+        y += round;
+        y -= round;
+      }
+    }
+
+    estr = fmt_u(e2 < 0 ? -e2 : e2, ebuf);
+    if (estr == ebuf)
+      *--estr = '0';
+    *--estr = (e2 < 0 ? '-' : '+');
+    *--estr = t + ('p' - 'a');
+
+    s = buf;
+    do {
+      int x = y;
+      *s++ = xdigits[x] | (t & 32);
+      y = 16 * (y - x);
+      if (s - buf == 1 && (y || p > 0 || (fl & ALT_FORM)))
+        *s++ = '.';
+    } while (y);
+
+    if (p && s - buf - 2 < p)
+      l = (p + 2) + (ebuf - estr);
+    else
+      l = (s - buf) + (ebuf - estr);
+
+    pad(f, ' ', w, pl + l, fl);
+    out(f, prefix, pl);
+    pad(f, '0', w, pl + l, fl ^ ZERO_PAD);
+    out(f, buf, s - buf);
+    pad(f, '0', l - (ebuf - estr) - (s - buf), 0, 0);
+    out(f, estr, ebuf - estr);
+    pad(f, ' ', w, pl + l, fl ^ LEFT_ADJ);
+    return MAX(w, pl + l);
+  }
+  if (p < 0)
+    p = 6;
+
+  if (y)
+    y *= 0x1p28, e2 -= 28;
+
+  if (e2 < 0)
+    a = r = z = big;
+  else
+    a = r = z = big + sizeof(big) / sizeof(*big) - LDBL_MANT_DIG - 1;
+
+  do {
+    *z = y;
+    y = 1000000000 * (y - *z++);
+  } while (y);
+
+  while (e2 > 0) {
+    uint32_t carry = 0;
+    int sh = MIN(29, e2);
+    for (d = z - 1; d >= a; d--) {
+      uint64_t x = ((uint64_t)*d << sh) + carry;
+      *d = x % 1000000000;
+      carry = x / 1000000000;
+    }
+    if (carry)
+      *--a = carry;
+    while (z > a && !z[-1])
+      z--;
+    e2 -= sh;
+  }
+  while (e2 < 0) {
+    uint32_t carry = 0, *b;
+    int sh = MIN(9, -e2), need = 1 + (p + LDBL_MANT_DIG / 3 + 8) / 9;
+    for (d = a; d < z; d++) {
+      uint32_t rm = *d & (1 << sh) - 1;
+      *d = (*d >> sh) + carry;
+      carry = (1000000000 >> sh) * rm;
+    }
+    if (!*a)
+      a++;
+    if (carry)
+      *z++ = carry;
+    /* Avoid (slow!) computation past requested precision */
+    b = (t | 32) == 'f' ? r : a;
+    if (z - b > need)
+      z = b + need;
+    e2 += sh;
+  }
+
+  if (a < z)
+    for (i = 10, e = 9 * (r - a); *a >= i; i *= 10, e++)
+      ;
+  else
+    e = 0;
+
+  /* Perform rounding: j is precision after the radix (possibly neg) */
+  j = p - ((t | 32) != 'f') * e - ((t | 32) == 'g' && p);
+  if (j < 9 * (z - r - 1)) {
+    uint32_t x;
+    /* We avoid C's broken division of negative numbers */
+    d = r + 1 + ((j + 9 * LDBL_MAX_EXP) / 9 - LDBL_MAX_EXP);
+    j += 9 * LDBL_MAX_EXP;
+    j %= 9;
+    for (i = 10, j++; j < 9; i *= 10, j++)
+      ;
+    x = *d % i;
+    /* Are there any significant digits past j? */
+    if (x || d + 1 != z) {
+      long double round = 2 / LDBL_EPSILON;
+      long double small;
+      if (*d / i & 1)
+        round += 2;
+      if (x < i / 2)
+        small = 0x0.8p0;
+      else if (x == i / 2 && d + 1 == z)
+        small = 0x1.0p0;
+      else
+        small = 0x1.8p0;
+      if (pl && *prefix == '-')
+        round *= -1, small *= -1;
+      *d -= x;
+      /* Decide whether to round by probing round+small */
+      if (round + small != round) {
+        *d = *d + i;
+        while (*d > 999999999) {
+          *d-- = 0;
+          if (d < a)
+            *--a = 0;
+          (*d)++;
+        }
+        for (i = 10, e = 9 * (r - a); *a >= i; i *= 10, e++)
+          ;
+      }
+    }
+    if (z > d + 1)
+      z = d + 1;
+  }
+  for (; z > a && !z[-1]; z--)
+    ;
+
+  if ((t | 32) == 'g') {
+    if (!p)
+      p++;
+    if (p > e && e >= -4) {
+      t--;
+      p -= e + 1;
+    } else {
+      t -= 2;
+      p--;
+    }
+    if (!(fl & ALT_FORM)) {
+      /* Count trailing zeros in last place */
+      if (z > a && z[-1])
+        for (i = 10, j = 0; z[-1] % i == 0; i *= 10, j++)
+          ;
+      else
+        j = 9;
+      if ((t | 32) == 'f')
+        p = MIN(p, MAX(0, 9 * (z - r - 1) - j));
+      else
+        p = MIN(p, MAX(0, 9 * (z - r - 1) + e - j));
+    }
+  }
+  l = 1 + p + (p || (fl & ALT_FORM));
+  if ((t | 32) == 'f') {
+    if (e > 0)
+      l += e;
+  } else {
+    estr = fmt_u(e < 0 ? -e : e, ebuf);
+    while (ebuf - estr < 2)
+      *--estr = '0';
+    *--estr = (e < 0 ? '-' : '+');
+    *--estr = t;
+    l += ebuf - estr;
+  }
+
+  pad(f, ' ', w, pl + l, fl);
+  out(f, prefix, pl);
+  pad(f, '0', w, pl + l, fl ^ ZERO_PAD);
+
+  if ((t | 32) == 'f') {
+    if (a > r)
+      a = r;
+    for (d = a; d <= r; d++) {
+      char* s = fmt_u(*d, buf + 9);
+      if (d != a)
+        while (s > buf)
+          *--s = '0';
+      else if (s == buf + 9)
+        *--s = '0';
+      out(f, s, buf + 9 - s);
+    }
+    if (p || (fl & ALT_FORM))
+      out(f, ".", 1);
+    for (; d < z && p > 0; d++, p -= 9) {
+      char* s = fmt_u(*d, buf + 9);
+      while (s > buf)
+        *--s = '0';
+      out(f, s, MIN(9, p));
+    }
+    pad(f, '0', p + 9, 9, 0);
+  } else {
+    if (z <= a)
+      z = a + 1;
+    for (d = a; d < z && p >= 0; d++) {
+      char* s = fmt_u(*d, buf + 9);
+      if (s == buf + 9)
+        *--s = '0';
+      if (d != a)
+        while (s > buf)
+          *--s = '0';
+      else {
+        out(f, s++, 1);
+        if (p > 0 || (fl & ALT_FORM))
+          out(f, ".", 1);
+      }
+      out(f, s, MIN(buf + 9 - s, p));
+      p -= buf + 9 - s;
+    }
+    pad(f, '0', p + 18, 18, 0);
+    out(f, estr, ebuf - estr);
+  }
+
+  pad(f, ' ', w, pl + l, fl ^ LEFT_ADJ);
+
+  return MAX(w, pl + l);
 }
 
-static int getint(char **s) {
-	int i;
-	for (i=0; isdigit(**s); (*s)++)
-		i = 10*i + (**s-'0');
-	return i;
+static int getint(char** s) {
+  int i;
+  for (i = 0; isdigit(**s); (*s)++)
+    i = 10 * i + (**s - '0');
+  return i;
 }
 
-static int printf_core(FILE *f, const char *fmt, va_list *ap, union arg *nl_arg, int *nl_type)
-{
-	char *a, *z, *s=(char *)fmt;
-	unsigned l10n=0, fl;
-	int w, p;
-	union arg arg;
-	int argpos;
-	unsigned st, ps;
-	int cnt=0, l=0;
-	int i;
-	char buf[sizeof(uintmax_t)*3+3+LDBL_MANT_DIG/4];
-	const char *prefix;
-	int t, pl;
-	wchar_t wc[2], *ws;
-	char mb[4];
-
-	for (;;) {
-		/* Update output count, end loop when fmt is exhausted */
-		if (cnt >= 0) {
-			if (l > INT_MAX - cnt) {
-				errno = EOVERFLOW;
-				cnt = -1;
-			} else cnt += l;
-		}
-		if (!*s) break;
-
-		/* Handle literal text and %% format specifiers */
-		for (a=s; *s && *s!='%'; s++);
-		for (z=s; s[0]=='%' && s[1]=='%'; z++, s+=2);
-		l = z-a;
-		if (f) out(f, a, l);
-		if (l) continue;
-
-		if (isdigit(s[1]) && s[2]=='$') {
-			l10n=1;
-			argpos = s[1]-'0';
-			s+=3;
-		} else {
-			argpos = -1;
-			s++;
-		}
-
-		/* Read modifier flags */
-		for (fl=0; (unsigned)*s-' '<32 && (FLAGMASK&(1U<<(*s-' '))); s++)
-			fl |= 1U<<(*s-' ');
-
-		/* Read field width */
-		if (*s=='*') {
-			if (isdigit(s[1]) && s[2]=='$') {
-				l10n=1;
-				nl_type[s[1]-'0'] = INT;
-				w = nl_arg[s[1]-'0'].i;
-				s+=3;
-			} else if (!l10n) {
-				w = f ? va_arg(*ap, int) : 0;
-				s++;
-			} else return -1;
-			if (w<0) fl|=LEFT_ADJ, w=-w;
-		} else if ((w=getint(&s))<0) return -1;
-
-		/* Read precision */
-		if (*s=='.' && s[1]=='*') {
-			if (isdigit(s[2]) && s[3]=='$') {
-				nl_type[s[2]-'0'] = INT;
-				p = nl_arg[s[2]-'0'].i;
-				s+=4;
-			} else if (!l10n) {
-				p = f ? va_arg(*ap, int) : 0;
-				s+=2;
-			} else return -1;
-		} else if (*s=='.') {
-			s++;
-			p = getint(&s);
-		} else p = -1;
-
-		/* Format specifier state machine */
-		st=0;
-		do {
-			if (OOB(*s)) return -1;
-			ps=st;
-			st=states[st]S(*s++);
-		} while (st-1<STOP);
-		if (!st) return -1;
-
-		/* Check validity of argument type (nl/normal) */
-		if (st==NOARG) {
-			if (argpos>=0) return -1;
-		} else {
-			if (argpos>=0) nl_type[argpos]=st, arg=nl_arg[argpos];
-			else if (f) pop_arg(&arg, st, ap);
-			else return 0;
-		}
-
-		if (!f) continue;
-
-		z = buf + sizeof(buf);
-		prefix = "-+   0X0x";
-		pl = 0;
-		t = s[-1];
-
-		/* Transform ls,lc -> S,C */
-		if (ps && (t&15)==3) t&=~32;
-
-		/* - and 0 flags are mutually exclusive */
-		if (fl & LEFT_ADJ) fl &= ~ZERO_PAD;
-
-		switch(t) {
-		case 'n':
-			switch(ps) {
-			case BARE: *(int *)arg.p = cnt; break;
-			case LPRE: *(long *)arg.p = cnt; break;
-			case LLPRE: *(long long *)arg.p = cnt; break;
-			case HPRE: *(unsigned short *)arg.p = cnt; break;
-			case HHPRE: *(unsigned char *)arg.p = cnt; break;
-			case ZTPRE: *(size_t *)arg.p = cnt; break;
-			case JPRE: *(uintmax_t *)arg.p = cnt; break;
-			}
-			continue;
-		case 'p':
-			p = MAX(p, 2*sizeof(void*));
-			t = 'x';
-			fl |= ALT_FORM;
-		case 'x': case 'X':
-			a = fmt_x(arg.i, z, t&32);
-			if (arg.i && (fl & ALT_FORM)) prefix+=(t>>4), pl=2;
-			if (0) {
-		case 'o':
-			a = fmt_o(arg.i, z);
-			if ((fl&ALT_FORM) && p<z-a+1) p=z-a+1;
-			} if (0) {
-		case 'd': case 'i':
-			pl=1;
-			if (arg.i>INTMAX_MAX) {
-				arg.i=-arg.i;
-			} else if (fl & MARK_POS) {
-				prefix++;
-			} else if (fl & PAD_POS) {
-				prefix+=2;
-			} else pl=0;
-		case 'u':
-			a = fmt_u(arg.i, z);
-			}
-			if (p>=0) fl &= ~ZERO_PAD;
-			if (!arg.i && !p) {
-				a=z;
-				break;
-			}
-			p = MAX(p, z-a + !arg.i);
-			break;
-		case 'c':
-			*(a=z-(p=1))=arg.i;
-			fl &= ~ZERO_PAD;
-			break;
-		case 'm':
-			if (1) a = strerror(errno); else
-		case 's':
-			a = arg.p ? arg.p : "(null)";
-			z = memchr(a, 0, p);
-			if (!z) z=a+p;
-			else p=z-a;
-			fl &= ~ZERO_PAD;
-			break;
-		case 'C':
-			wc[0] = arg.i;
-			wc[1] = 0;
-			arg.p = wc;
-			p = -1;
-		case 'S':
-			ws = arg.p;
-			for (i=l=0; i<0U+p && *ws && (l=wctomb(mb, *ws++))>=0 && l<=0U+p-i; i+=l);
-			if (l<0) return -1;
-			p = i;
-			pad(f, ' ', w, p, fl);
-			ws = arg.p;
-			for (i=0; i<0U+p && *ws && i+(l=wctomb(mb, *ws++))<=p; i+=l)
-				out(f, mb, l);
-			pad(f, ' ', w, p, fl^LEFT_ADJ);
-			l = w>p ? w : p;
-			continue;
-		case 'e': case 'f': case 'g': case 'a':
-		case 'E': case 'F': case 'G': case 'A':
-			l = fmt_fp(f, arg.f, w, p, fl, t);
-			continue;
-		}
-
-		if (p < z-a) p = z-a;
-		if (w < pl+p) w = pl+p;
-
-		pad(f, ' ', w, pl+p, fl);
-		out(f, prefix, pl);
-		pad(f, '0', w, pl+p, fl^ZERO_PAD);
-		pad(f, '0', p, z-a, 0);
-		out(f, a, z-a);
-		pad(f, ' ', w, pl+p, fl^LEFT_ADJ);
-
-		l = w;
-	}
-
-	if (f) return cnt;
-	if (!l10n) return 0;
-
-	for (i=1; i<=NL_ARGMAX && nl_type[i]; i++)
-		pop_arg(nl_arg+i, nl_type[i], ap);
-	for (; i<=NL_ARGMAX && !nl_type[i]; i++);
-	if (i<=NL_ARGMAX) return -1;
-	return 1;
+static int printf_core(FILE* f,
+                       const char* fmt,
+                       va_list* ap,
+                       union arg* nl_arg,
+                       int* nl_type) {
+  char *a, *z, *s = (char *)fmt;
+  unsigned l10n = 0, fl;
+  int w, p;
+  union arg arg;
+  int argpos;
+  unsigned st, ps;
+  int cnt = 0, l = 0;
+  int i;
+  char buf[sizeof(uintmax_t) * 3 + 3 + LDBL_MANT_DIG / 4];
+  const char* prefix;
+  int t, pl;
+  wchar_t wc[2], *ws;
+  char mb[4];
+
+  for (;;) {
+    /* Update output count, end loop when fmt is exhausted */
+    if (cnt >= 0) {
+      if (l > INT_MAX - cnt) {
+        errno = EOVERFLOW;
+        cnt = -1;
+      } else
+        cnt += l;
+    }
+    if (!*s)
+      break;
+
+    /* Handle literal text and %% format specifiers */
+    for (a = s; *s && *s != '%'; s++)
+      ;
+    for (z = s; s[0] == '%' && s[1] == '%'; z++, s += 2)
+      ;
+    l = z - a;
+    if (f)
+      out(f, a, l);
+    if (l)
+      continue;
+
+    if (isdigit(s[1]) && s[2] == '$') {
+      l10n = 1;
+      argpos = s[1] - '0';
+      s += 3;
+    } else {
+      argpos = -1;
+      s++;
+    }
+
+    /* Read modifier flags */
+    for (fl = 0; (unsigned)*s - ' ' < 32 && (FLAGMASK & (1U << (*s - ' ')));
+         s++)
+      fl |= 1U << (*s - ' ');
+
+    /* Read field width */
+    if (*s == '*') {
+      if (isdigit(s[1]) && s[2] == '$') {
+        l10n = 1;
+        nl_type[s[1] - '0'] = INT;
+        w = nl_arg[s[1] - '0'].i;
+        s += 3;
+      } else if (!l10n) {
+        w = f ? va_arg(*ap, int) : 0;
+        s++;
+      } else
+        return -1;
+      if (w < 0)
+        fl |= LEFT_ADJ, w = -w;
+    } else if ((w = getint(&s)) < 0)
+      return -1;
+
+    /* Read precision */
+    if (*s == '.' && s[1] == '*') {
+      if (isdigit(s[2]) && s[3] == '$') {
+        nl_type[s[2] - '0'] = INT;
+        p = nl_arg[s[2] - '0'].i;
+        s += 4;
+      } else if (!l10n) {
+        p = f ? va_arg(*ap, int) : 0;
+        s += 2;
+      } else
+        return -1;
+    } else if (*s == '.') {
+      s++;
+      p = getint(&s);
+    } else
+      p = -1;
+
+    /* Format specifier state machine */
+    st = 0;
+    do {
+      if (OOB(*s))
+        return -1;
+      ps = st;
+      st = states[st] S(*s++);
+    } while (st - 1 < STOP);
+    if (!st)
+      return -1;
+
+    /* Check validity of argument type (nl/normal) */
+    if (st == NOARG) {
+      if (argpos >= 0)
+        return -1;
+    } else {
+      if (argpos >= 0)
+        nl_type[argpos] = st, arg = nl_arg[argpos];
+      else if (f)
+        pop_arg(&arg, st, ap);
+      else
+        return 0;
+    }
+
+    if (!f)
+      continue;
+
+    z = buf + sizeof(buf);
+    prefix = "-+   0X0x";
+    pl = 0;
+    t = s[-1];
+
+    /* Transform ls,lc -> S,C */
+    if (ps && (t & 15) == 3)
+      t &= ~32;
+
+    /* - and 0 flags are mutually exclusive */
+    if (fl & LEFT_ADJ)
+      fl &= ~ZERO_PAD;
+
+    switch (t) {
+      case 'n':
+        switch (ps) {
+          case BARE:
+            *(int*)arg.p = cnt;
+            break;
+          case LPRE:
+            *(long*)arg.p = cnt;
+            break;
+          case LLPRE:
+            *(long long*)arg.p = cnt;
+            break;
+          case HPRE:
+            *(unsigned short*)arg.p = cnt;
+            break;
+          case HHPRE:
+            *(unsigned char*)arg.p = cnt;
+            break;
+          case ZTPRE:
+            *(size_t*)arg.p = cnt;
+            break;
+          case JPRE:
+            *(uintmax_t*)arg.p = cnt;
+            break;
+        }
+        continue;
+      case 'p':
+        p = MAX(p, 2 * sizeof(void*));
+        t = 'x';
+        fl |= ALT_FORM;
+      case 'x':
+      case 'X':
+        a = fmt_x(arg.i, z, t & 32);
+        if (arg.i && (fl & ALT_FORM))
+          prefix += (t >> 4), pl = 2;
+        if (0) {
+          case 'o':
+            a = fmt_o(arg.i, z);
+            if ((fl & ALT_FORM) && p < z - a + 1)
+              p = z - a + 1;
+        }
+        if (0) {
+          case 'd':
+          case 'i':
+            pl = 1;
+            if (arg.i > INTMAX_MAX) {
+              arg.i = -arg.i;
+            } else if (fl & MARK_POS) {
+              prefix++;
+            } else if (fl & PAD_POS) {
+              prefix += 2;
+            } else
+              pl = 0;
+          case 'u':
+            a = fmt_u(arg.i, z);
+        }
+        if (p >= 0)
+          fl &= ~ZERO_PAD;
+        if (!arg.i && !p) {
+          a = z;
+          break;
+        }
+        p = MAX(p, z - a + !arg.i);
+        break;
+      case 'c':
+        *(a = z - (p = 1)) = arg.i;
+        fl &= ~ZERO_PAD;
+        break;
+      case 'm':
+        if (1)
+          a = strerror(errno);
+        else
+        case 's':
+        a = arg.p ? arg.p : "(null)";
+        z = memchr(a, 0, p);
+        if (!z)
+          z = a + p;
+        else
+          p = z - a;
+        fl &= ~ZERO_PAD;
+        break;
+      case 'C':
+        wc[0] = arg.i;
+        wc[1] = 0;
+        arg.p = wc;
+        p = -1;
+      case 'S':
+        ws = arg.p;
+        for (i = l = 0; i < 0U + p && *ws && (l = wctomb(mb, *ws++)) >= 0 &&
+                        l <= 0U + p - i;
+             i += l)
+          ;
+        if (l < 0)
+          return -1;
+        p = i;
+        pad(f, ' ', w, p, fl);
+        ws = arg.p;
+        for (i = 0; i < 0U + p && *ws && i + (l = wctomb(mb, *ws++)) <= p;
+             i += l)
+          out(f, mb, l);
+        pad(f, ' ', w, p, fl ^ LEFT_ADJ);
+        l = w > p ? w : p;
+        continue;
+      case 'e':
+      case 'f':
+      case 'g':
+      case 'a':
+      case 'E':
+      case 'F':
+      case 'G':
+      case 'A':
+        l = fmt_fp(f, arg.f, w, p, fl, t);
+        continue;
+    }
+
+    if (p < z - a)
+      p = z - a;
+    if (w < pl + p)
+      w = pl + p;
+
+    pad(f, ' ', w, pl + p, fl);
+    out(f, prefix, pl);
+    pad(f, '0', w, pl + p, fl ^ ZERO_PAD);
+    pad(f, '0', p, z - a, 0);
+    out(f, a, z - a);
+    pad(f, ' ', w, pl + p, fl ^ LEFT_ADJ);
+
+    l = w;
+  }
+
+  if (f)
+    return cnt;
+  if (!l10n)
+    return 0;
+
+  for (i = 1; i <= NL_ARGMAX && nl_type[i]; i++)
+    pop_arg(nl_arg + i, nl_type[i], ap);
+  for (; i <= NL_ARGMAX && !nl_type[i]; i++)
+    ;
+  if (i <= NL_ARGMAX)
+    return -1;
+  return 1;
 }
 
-int vfprintf(FILE *restrict f, const char *restrict fmt, va_list ap)
-{
-	va_list ap2;
-	int nl_type[NL_ARGMAX+1] = {0};
-	union arg nl_arg[NL_ARGMAX+1];
-	unsigned char internal_buf[80], *saved_buf = 0;
-	int olderr;
-	int ret;
-
-	/* the copy allows passing va_list* even if va_list is an array */
-	va_copy(ap2, ap);
-	if (printf_core(0, fmt, &ap2, nl_arg, nl_type) < 0) {
-		va_end(ap2);
-		return -1;
-	}
-
-	FLOCK(f);
-	olderr = f->flags & F_ERR;
-	if (f->mode < 1) f->flags &= ~F_ERR;
-	if (!f->buf_size) {
-		saved_buf = f->buf;
-		f->wpos = f->wbase = f->buf = internal_buf;
-		f->buf_size = sizeof internal_buf;
-		f->wend = internal_buf + sizeof internal_buf;
-	}
-	ret = printf_core(f, fmt, &ap2, nl_arg, nl_type);
-	if (saved_buf) {
-		f->write(f, 0, 0);
-		if (!f->wpos) ret = -1;
-		f->buf = saved_buf;
-		f->buf_size = 0;
-		f->wpos = f->wbase = f->wend = 0;
-	}
-	if (f->flags & F_ERR) ret = -1;
-	f->flags |= olderr;
-	FUNLOCK(f);
-	va_end(ap2);
-	return ret;
+int vfprintf(FILE* restrict f, const char* restrict fmt, va_list ap) {
+  va_list ap2;
+  int nl_type[NL_ARGMAX + 1] = {0};
+  union arg nl_arg[NL_ARGMAX + 1];
+  unsigned char internal_buf[80], *saved_buf = 0;
+  int olderr;
+  int ret;
+
+  /* the copy allows passing va_list* even if va_list is an array */
+  va_copy(ap2, ap);
+  if (printf_core(0, fmt, &ap2, nl_arg, nl_type) < 0) {
+    va_end(ap2);
+    return -1;
+  }
+
+  FLOCK(f);
+  olderr = f->flags & F_ERR;
+  if (f->mode < 1)
+    f->flags &= ~F_ERR;
+  if (!f->buf_size) {
+    saved_buf = f->buf;
+    f->wpos = f->wbase = f->buf = internal_buf;
+    f->buf_size = sizeof internal_buf;
+    f->wend = internal_buf + sizeof internal_buf;
+  }
+  ret = printf_core(f, fmt, &ap2, nl_arg, nl_type);
+  if (saved_buf) {
+    f->write(f, 0, 0);
+    if (!f->wpos)
+      ret = -1;
+    f->buf = saved_buf;
+    f->buf_size = 0;
+    f->wpos = f->wbase = f->wend = 0;
+  }
+  if (f->flags & F_ERR)
+    ret = -1;
+  f->flags |= olderr;
+  FUNLOCK(f);
+  va_end(ap2);
+  return ret;
 }