1/*	$OpenBSD: vfwprintf.c,v 1.23 2023/10/06 16:41:02 millert Exp $ */
2/*-
3 * Copyright (c) 1990 The Regents of the University of California.
4 * All rights reserved.
5 *
6 * This code is derived from software contributed to Berkeley by
7 * Chris Torek.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 *    notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 *    notice, this list of conditions and the following disclaimer in the
16 *    documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34/*
35 * Actual wprintf innards.
36 *
37 * This code is large and complicated...
38 */
39
40#include <sys/types.h>
41#include <sys/mman.h>
42
43#include <errno.h>
44#include <langinfo.h>
45#include <limits.h>
46#include <stdarg.h>
47#include <stddef.h>
48#include <stdio.h>
49#include <stdint.h>
50#include <stdlib.h>
51#include <string.h>
52#include <syslog.h>
53#include <unistd.h>
54
55#include "local.h"
56#include "fvwrite.h"
57
58union arg {
59	int			intarg;
60	unsigned int		uintarg;
61	long			longarg;
62	unsigned long		ulongarg;
63	long long		longlongarg;
64	unsigned long long	ulonglongarg;
65	ptrdiff_t		ptrdiffarg;
66	size_t			sizearg;
67	ssize_t			ssizearg;
68	intmax_t		intmaxarg;
69	uintmax_t		uintmaxarg;
70	void			*pvoidarg;
71	char			*pchararg;
72	signed char		*pschararg;
73	short			*pshortarg;
74	int			*pintarg;
75	long			*plongarg;
76	long long		*plonglongarg;
77	ptrdiff_t		*pptrdiffarg;
78	ssize_t			*pssizearg;
79	intmax_t		*pintmaxarg;
80#ifdef FLOATING_POINT
81	double			doublearg;
82	long double		longdoublearg;
83#endif
84	wint_t			wintarg;
85	wchar_t			*pwchararg;
86};
87
88static int __find_arguments(const wchar_t *fmt0, va_list ap, union arg **argtable,
89    size_t *argtablesiz);
90static int __grow_type_table(unsigned char **typetable, int *tablesize);
91
92/*
93 * Helper function for `fprintf to unbuffered unix file': creates a
94 * temporary buffer.  We only work on write-only files; this avoids
95 * worries about ungetc buffers and so forth.
96 */
97static int
98__sbprintf(FILE *fp, const wchar_t *fmt, va_list ap)
99{
100	int ret;
101	FILE fake;
102	struct __sfileext fakeext;
103	unsigned char buf[BUFSIZ];
104
105	_FILEEXT_SETUP(&fake, &fakeext);
106	/* copy the important variables */
107	fake._flags = fp->_flags & ~__SNBF;
108	fake._file = fp->_file;
109	fake._cookie = fp->_cookie;
110	fake._write = fp->_write;
111
112	/* set up the buffer */
113	fake._bf._base = fake._p = buf;
114	fake._bf._size = fake._w = sizeof(buf);
115	fake._lbfsize = 0;	/* not actually used, but Just In Case */
116
117	/* do the work, then copy any error status */
118	ret = __vfwprintf(&fake, fmt, ap);
119	if (ret >= 0 && __sflush(&fake))
120		ret = EOF;
121	if (fake._flags & __SERR)
122		fp->_flags |= __SERR;
123	return (ret);
124}
125
126/*
127 * Like __fputwc_unlock, but handles fake string (__SSTR) files properly.
128 * File must already be locked.
129 */
130static wint_t
131__xfputwc(wchar_t wc, FILE *fp)
132{
133	mbstate_t mbs;
134	char buf[MB_LEN_MAX];
135	struct __suio uio;
136	struct __siov iov;
137	size_t len;
138
139	if ((fp->_flags & __SSTR) == 0)
140		return (__fputwc_unlock(wc, fp));
141
142	bzero(&mbs, sizeof(mbs));
143	len = wcrtomb(buf, wc, &mbs);
144	if (len == (size_t)-1) {
145		fp->_flags |= __SERR;
146		errno = EILSEQ;
147		return (WEOF);
148	}
149	uio.uio_iov = &iov;
150	uio.uio_resid = len;
151	uio.uio_iovcnt = 1;
152	iov.iov_base = buf;
153	iov.iov_len = len;
154	return (__sfvwrite(fp, &uio) != EOF ? (wint_t)wc : WEOF);
155}
156
157/*
158 * Convert a multibyte character string argument for the %s format to a wide
159 * string representation. ``prec'' specifies the maximum number of bytes
160 * to output. If ``prec'' is greater than or equal to zero, we can't assume
161 * that the multibyte character string ends in a null character.
162 *
163 * Returns NULL on failure.
164 * To find out what happened check errno for ENOMEM, EILSEQ and EINVAL.
165 */
166static wchar_t *
167__mbsconv(char *mbsarg, int prec)
168{
169	mbstate_t mbs;
170	wchar_t *convbuf, *wcp;
171	const char *p;
172	size_t insize, nchars, nconv;
173
174	if (mbsarg == NULL)
175		return (NULL);
176
177	/*
178	 * Supplied argument is a multibyte string; convert it to wide
179	 * characters first.
180	 */
181	if (prec >= 0) {
182		/*
183		 * String is not guaranteed to be NUL-terminated. Find the
184		 * number of characters to print.
185		 */
186		p = mbsarg;
187		insize = nchars = nconv = 0;
188		bzero(&mbs, sizeof(mbs));
189		while (nchars != (size_t)prec) {
190			nconv = mbrlen(p, MB_CUR_MAX, &mbs);
191			if (nconv == (size_t)0 || nconv == (size_t)-1 ||
192			    nconv == (size_t)-2)
193				break;
194			p += nconv;
195			nchars++;
196			insize += nconv;
197		}
198		if (nconv == (size_t)-1 || nconv == (size_t)-2)
199			return (NULL);
200	} else
201		insize = strlen(mbsarg);
202
203	/*
204	 * Allocate buffer for the result and perform the conversion,
205	 * converting at most `size' bytes of the input multibyte string to
206	 * wide characters for printing.
207	 */
208	convbuf = calloc(insize + 1, sizeof(*convbuf));
209	if (convbuf == NULL)
210		return (NULL);
211	wcp = convbuf;
212	p = mbsarg;
213	bzero(&mbs, sizeof(mbs));
214	nconv = 0;
215	while (insize != 0) {
216		nconv = mbrtowc(wcp, p, insize, &mbs);
217		if (nconv == 0 || nconv == (size_t)-1 || nconv == (size_t)-2)
218			break;
219		wcp++;
220		p += nconv;
221		insize -= nconv;
222	}
223	if (nconv == (size_t)-1 || nconv == (size_t)-2) {
224		free(convbuf);
225		return (NULL);
226	}
227	*wcp = '\0';
228
229	return (convbuf);
230}
231
232#ifdef FLOATING_POINT
233#include <float.h>
234#include <locale.h>
235#include <math.h>
236#include "floatio.h"
237#include "gdtoa.h"
238
239#define	DEFPREC		6
240
241static int exponent(wchar_t *, int, int);
242#endif /* FLOATING_POINT */
243
244/*
245 * The size of the buffer we use as scratch space for integer
246 * conversions, among other things.  Technically, we would need the
247 * most space for base 10 conversions with thousands' grouping
248 * characters between each pair of digits.  100 bytes is a
249 * conservative overestimate even for a 128-bit uintmax_t.
250 */
251#define BUF	100
252
253#define STATIC_ARG_TBL_SIZE 8	/* Size of static argument table. */
254
255
256/*
257 * Macros for converting digits to letters and vice versa
258 */
259#define	to_digit(c)	((c) - '0')
260#define is_digit(c)	((unsigned)to_digit(c) <= 9)
261#define	to_char(n)	((wchar_t)((n) + '0'))
262
263/*
264 * Flags used during conversion.
265 */
266#define	ALT		0x0001		/* alternate form */
267#define	LADJUST		0x0004		/* left adjustment */
268#define	LONGDBL		0x0008		/* long double */
269#define	LONGINT		0x0010		/* long integer */
270#define	LLONGINT	0x0020		/* long long integer */
271#define	SHORTINT	0x0040		/* short integer */
272#define	ZEROPAD		0x0080		/* zero (as opposed to blank) pad */
273#define FPT		0x0100		/* Floating point number */
274#define PTRINT		0x0200		/* (unsigned) ptrdiff_t */
275#define SIZEINT		0x0400		/* (signed) size_t */
276#define CHARINT		0x0800		/* 8 bit integer */
277#define MAXINT		0x1000		/* largest integer size (intmax_t) */
278
279int
280__vfwprintf(FILE * __restrict fp, const wchar_t * __restrict fmt0, __va_list ap)
281{
282	wchar_t *fmt;		/* format string */
283	wchar_t ch;		/* character from fmt */
284	int n, n2, n3;		/* handy integers (short term usage) */
285	wchar_t *cp;		/* handy char pointer (short term usage) */
286	int flags;		/* flags as above */
287	int ret;		/* return value accumulator */
288	int width;		/* width from format (%8d), or 0 */
289	int prec;		/* precision from format; <0 for N/A */
290	wchar_t sign;		/* sign prefix (' ', '+', '-', or \0) */
291#ifdef FLOATING_POINT
292	/*
293	 * We can decompose the printed representation of floating
294	 * point numbers into several parts, some of which may be empty:
295	 *
296	 * [+|-| ] [0x|0X] MMM . NNN [e|E|p|P] [+|-] ZZ
297	 *    A       B     ---C---      D       E   F
298	 *
299	 * A:	'sign' holds this value if present; '\0' otherwise
300	 * B:	ox[1] holds the 'x' or 'X'; '\0' if not hexadecimal
301	 * C:	cp points to the string MMMNNN.  Leading and trailing
302	 *	zeros are not in the string and must be added.
303	 * D:	expchar holds this character; '\0' if no exponent, e.g. %f
304	 * F:	at least two digits for decimal, at least one digit for hex
305	 */
306	char *decimal_point = NULL;
307	int signflag;		/* true if float is negative */
308	union {			/* floating point arguments %[aAeEfFgG] */
309		double dbl;
310		long double ldbl;
311	} fparg;
312	int expt;		/* integer value of exponent */
313	char expchar;		/* exponent character: [eEpP\0] */
314	char *dtoaend;		/* pointer to end of converted digits */
315	int expsize;		/* character count for expstr */
316	int lead;		/* sig figs before decimal or group sep */
317	int ndig;		/* actual number of digits returned by dtoa */
318	wchar_t expstr[MAXEXPDIG+2];	/* buffer for exponent string: e+ZZZ */
319	char *dtoaresult = NULL;
320#endif
321
322	uintmax_t _umax;	/* integer arguments %[diouxX] */
323	enum { OCT, DEC, HEX } base;	/* base for %[diouxX] conversion */
324	int dprec;		/* a copy of prec if %[diouxX], 0 otherwise */
325	int realsz;		/* field size expanded by dprec */
326	int size;		/* size of converted field or string */
327	const char *xdigs;	/* digits for %[xX] conversion */
328	wchar_t buf[BUF];	/* buffer with space for digits of uintmax_t */
329	wchar_t ox[2];		/* space for 0x; ox[1] is either x, X, or \0 */
330	union arg *argtable;	/* args, built due to positional arg */
331	union arg statargtable[STATIC_ARG_TBL_SIZE];
332	size_t argtablesiz;
333	int nextarg;		/* 1-based argument index */
334	va_list orgap;		/* original argument pointer */
335	wchar_t *convbuf;	/* buffer for multibyte to wide conversion */
336
337	/*
338	 * Choose PADSIZE to trade efficiency vs. size.  If larger printf
339	 * fields occur frequently, increase PADSIZE and make the initialisers
340	 * below longer.
341	 */
342#define	PADSIZE	16		/* pad chunk size */
343	static wchar_t blanks[PADSIZE] =
344	 {' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' '};
345	static wchar_t zeroes[PADSIZE] =
346	 {'0','0','0','0','0','0','0','0','0','0','0','0','0','0','0','0'};
347
348	static const char xdigs_lower[16] = "0123456789abcdef";
349	static const char xdigs_upper[16] = "0123456789ABCDEF";
350
351	/*
352	 * BEWARE, these `goto error' on error, PRINT uses 'n3',
353	 * PAD uses `n' and 'n3', and PRINTANDPAD uses 'n', 'n2', and 'n3'.
354	 */
355#define	PRINT(ptr, len)	do {	\
356	for (n3 = 0; n3 < (len); n3++) {	\
357		if ((__xfputwc((ptr)[n3], fp)) == WEOF)	\
358			goto error; \
359	} \
360} while (0)
361#define	PAD(howmany, with) do { \
362	if ((n = (howmany)) > 0) { \
363		while (n > PADSIZE) { \
364			PRINT(with, PADSIZE); \
365			n -= PADSIZE; \
366		} \
367		PRINT(with, n); \
368	} \
369} while (0)
370#define	PRINTANDPAD(p, ep, len, with) do {	\
371	n2 = (ep) - (p);       			\
372	if (n2 > (len))				\
373		n2 = (len);			\
374	if (n2 > 0)				\
375		PRINT((p), n2);			\
376	PAD((len) - (n2 > 0 ? n2 : 0), (with));	\
377} while(0)
378
379	/*
380	 * To extend shorts properly, we need both signed and unsigned
381	 * argument extraction methods.
382	 */
383#define	SARG() \
384	((intmax_t)(flags&MAXINT ? GETARG(intmax_t) : \
385	    flags&LLONGINT ? GETARG(long long) : \
386	    flags&LONGINT ? GETARG(long) : \
387	    flags&PTRINT ? GETARG(ptrdiff_t) : \
388	    flags&SIZEINT ? GETARG(ssize_t) : \
389	    flags&SHORTINT ? (short)GETARG(int) : \
390	    flags&CHARINT ? (signed char)GETARG(int) : \
391	    GETARG(int)))
392#define	UARG() \
393	((uintmax_t)(flags&MAXINT ? GETARG(uintmax_t) : \
394	    flags&LLONGINT ? GETARG(unsigned long long) : \
395	    flags&LONGINT ? GETARG(unsigned long) : \
396	    flags&PTRINT ? (uintptr_t)GETARG(ptrdiff_t) : /* XXX */ \
397	    flags&SIZEINT ? GETARG(size_t) : \
398	    flags&SHORTINT ? (unsigned short)GETARG(int) : \
399	    flags&CHARINT ? (unsigned char)GETARG(int) : \
400	    GETARG(unsigned int)))
401
402	/*
403	 * Append a digit to a value and check for overflow.
404	 */
405#define APPEND_DIGIT(val, dig) do { \
406	if ((val) > INT_MAX / 10) \
407		goto overflow; \
408	(val) *= 10; \
409	if ((val) > INT_MAX - to_digit((dig))) \
410		goto overflow; \
411	(val) += to_digit((dig)); \
412} while (0)
413
414	 /*
415	  * Get * arguments, including the form *nn$.  Preserve the nextarg
416	  * that the argument can be gotten once the type is determined.
417	  */
418#define GETASTER(val) \
419	n2 = 0; \
420	cp = fmt; \
421	while (is_digit(*cp)) { \
422		APPEND_DIGIT(n2, *cp); \
423		cp++; \
424	} \
425	if (*cp == '$') { \
426		int hold = nextarg; \
427		if (argtable == NULL) { \
428			argtable = statargtable; \
429			if (__find_arguments(fmt0, orgap, &argtable, \
430			    &argtablesiz) == -1) { \
431				ret = -1; \
432				goto error; \
433			} \
434		} \
435		nextarg = n2; \
436		val = GETARG(int); \
437		nextarg = hold; \
438		fmt = ++cp; \
439	} else { \
440		val = GETARG(int); \
441	}
442
443/*
444* Get the argument indexed by nextarg.   If the argument table is
445* built, use it to get the argument.  If its not, get the next
446* argument (and arguments must be gotten sequentially).
447*/
448#define GETARG(type) \
449	((argtable != NULL) ? *((type*)(&argtable[nextarg++])) : \
450		(nextarg++, va_arg(ap, type)))
451
452	_SET_ORIENTATION(fp, 1);
453	/* sorry, fwprintf(read_only_file, "") returns EOF, not 0 */
454	if (cantwrite(fp))
455		return (EOF);
456
457	/* optimise fwprintf(stderr) (and other unbuffered Unix files) */
458	if ((fp->_flags & (__SNBF|__SWR|__SRW)) == (__SNBF|__SWR) &&
459	    fp->_file >= 0)
460		return (__sbprintf(fp, fmt0, ap));
461
462	fmt = (wchar_t *)fmt0;
463	argtable = NULL;
464	nextarg = 1;
465	va_copy(orgap, ap);
466	ret = 0;
467	convbuf = NULL;
468
469	/*
470	 * Scan the format for conversions (`%' character).
471	 */
472	for (;;) {
473		for (cp = fmt; (ch = *fmt) != '\0' && ch != '%'; fmt++)
474			continue;
475		if (fmt != cp) {
476			ptrdiff_t m = fmt - cp;
477			if (m < 0 || m > INT_MAX - ret)
478				goto overflow;
479			PRINT(cp, m);
480			ret += m;
481		}
482		if (ch == '\0')
483			goto done;
484		fmt++;		/* skip over '%' */
485
486		flags = 0;
487		dprec = 0;
488		width = 0;
489		prec = -1;
490		sign = '\0';
491		ox[1] = '\0';
492
493rflag:		ch = *fmt++;
494reswitch:	switch (ch) {
495		case ' ':
496			/*
497			 * ``If the space and + flags both appear, the space
498			 * flag will be ignored.''
499			 *	-- ANSI X3J11
500			 */
501			if (!sign)
502				sign = ' ';
503			goto rflag;
504		case '#':
505			flags |= ALT;
506			goto rflag;
507		case '\'':
508			/* grouping not implemented */
509			goto rflag;
510		case '*':
511			/*
512			 * ``A negative field width argument is taken as a
513			 * - flag followed by a positive field width.''
514			 *	-- ANSI X3J11
515			 * They don't exclude field widths read from args.
516			 */
517			GETASTER(width);
518			if (width >= 0)
519				goto rflag;
520			if (width == INT_MIN)
521				goto overflow;
522			width = -width;
523			/* FALLTHROUGH */
524		case '-':
525			flags |= LADJUST;
526			goto rflag;
527		case '+':
528			sign = '+';
529			goto rflag;
530		case '.':
531			if ((ch = *fmt++) == '*') {
532				GETASTER(n);
533				prec = n < 0 ? -1 : n;
534				goto rflag;
535			}
536			n = 0;
537			while (is_digit(ch)) {
538				APPEND_DIGIT(n, ch);
539				ch = *fmt++;
540			}
541			if (ch == '$') {
542				nextarg = n;
543				if (argtable == NULL) {
544					argtable = statargtable;
545					if (__find_arguments(fmt0, orgap,
546					    &argtable, &argtablesiz) == -1) {
547						ret = -1;
548						goto error;
549					}
550				}
551				goto rflag;
552			}
553			prec = n;
554			goto reswitch;
555		case '0':
556			/*
557			 * ``Note that 0 is taken as a flag, not as the
558			 * beginning of a field width.''
559			 *	-- ANSI X3J11
560			 */
561			flags |= ZEROPAD;
562			goto rflag;
563		case '1': case '2': case '3': case '4':
564		case '5': case '6': case '7': case '8': case '9':
565			n = 0;
566			do {
567				APPEND_DIGIT(n, ch);
568				ch = *fmt++;
569			} while (is_digit(ch));
570			if (ch == '$') {
571				nextarg = n;
572				if (argtable == NULL) {
573					argtable = statargtable;
574					if (__find_arguments(fmt0, orgap,
575					    &argtable, &argtablesiz) == -1) {
576						ret = -1;
577						goto error;
578					}
579				}
580				goto rflag;
581			}
582			width = n;
583			goto reswitch;
584#ifdef FLOATING_POINT
585		case 'L':
586			flags |= LONGDBL;
587			goto rflag;
588#endif
589		case 'h':
590			if (*fmt == 'h') {
591				fmt++;
592				flags |= CHARINT;
593			} else {
594				flags |= SHORTINT;
595			}
596			goto rflag;
597		case 'j':
598			flags |= MAXINT;
599			goto rflag;
600		case 'l':
601			if (*fmt == 'l') {
602				fmt++;
603				flags |= LLONGINT;
604			} else {
605				flags |= LONGINT;
606			}
607			goto rflag;
608		case 'q':
609			flags |= LLONGINT;
610			goto rflag;
611		case 't':
612			flags |= PTRINT;
613			goto rflag;
614		case 'z':
615			flags |= SIZEINT;
616			goto rflag;
617		case 'C':
618			flags |= LONGINT;
619			/*FALLTHROUGH*/
620		case 'c':
621			if (flags & LONGINT)
622				*(cp = buf) = (wchar_t)GETARG(wint_t);
623			else
624				*(cp = buf) = (wchar_t)btowc(GETARG(int));
625			size = 1;
626			sign = '\0';
627			break;
628		case 'D':
629			flags |= LONGINT;
630			/*FALLTHROUGH*/
631		case 'd':
632		case 'i':
633			_umax = SARG();
634			if ((intmax_t)_umax < 0) {
635				_umax = -_umax;
636				sign = '-';
637			}
638			base = DEC;
639			goto number;
640#ifdef FLOATING_POINT
641		case 'a':
642		case 'A':
643			if (ch == 'a') {
644				ox[1] = 'x';
645				xdigs = xdigs_lower;
646				expchar = 'p';
647			} else {
648				ox[1] = 'X';
649				xdigs = xdigs_upper;
650				expchar = 'P';
651			}
652			if (prec >= 0)
653				prec++;
654			if (dtoaresult)
655				__freedtoa(dtoaresult);
656			if (flags & LONGDBL) {
657				fparg.ldbl = GETARG(long double);
658				dtoaresult =
659				    __hldtoa(fparg.ldbl, xdigs, prec,
660				    &expt, &signflag, &dtoaend);
661				if (dtoaresult == NULL) {
662					errno = ENOMEM;
663					goto error;
664				}
665			} else {
666				fparg.dbl = GETARG(double);
667				dtoaresult =
668				    __hdtoa(fparg.dbl, xdigs, prec,
669				    &expt, &signflag, &dtoaend);
670				if (dtoaresult == NULL) {
671					errno = ENOMEM;
672					goto error;
673				}
674			}
675			if (prec < 0)
676				prec = dtoaend - dtoaresult;
677			if (expt == INT_MAX)
678				ox[1] = '\0';
679			free(convbuf);
680			cp = convbuf = __mbsconv(dtoaresult, -1);
681			if (cp == NULL)
682				goto error;
683			ndig = dtoaend - dtoaresult;
684			goto fp_common;
685		case 'e':
686		case 'E':
687			expchar = ch;
688			if (prec < 0)	/* account for digit before decpt */
689				prec = DEFPREC + 1;
690			else
691				prec++;
692			goto fp_begin;
693		case 'f':
694		case 'F':
695			expchar = '\0';
696			goto fp_begin;
697		case 'g':
698		case 'G':
699			expchar = ch - ('g' - 'e');
700 			if (prec == 0)
701 				prec = 1;
702fp_begin:
703			if (prec < 0)
704				prec = DEFPREC;
705			if (dtoaresult)
706				__freedtoa(dtoaresult);
707			if (flags & LONGDBL) {
708				fparg.ldbl = GETARG(long double);
709				dtoaresult =
710				    __ldtoa(&fparg.ldbl, expchar ? 2 : 3, prec,
711				    &expt, &signflag, &dtoaend);
712				if (dtoaresult == NULL) {
713					errno = ENOMEM;
714					goto error;
715				}
716			} else {
717				fparg.dbl = GETARG(double);
718				dtoaresult =
719				    __dtoa(fparg.dbl, expchar ? 2 : 3, prec,
720				    &expt, &signflag, &dtoaend);
721				if (dtoaresult == NULL) {
722					errno = ENOMEM;
723					goto error;
724				}
725				if (expt == 9999)
726					expt = INT_MAX;
727 			}
728			free(convbuf);
729			cp = convbuf = __mbsconv(dtoaresult, -1);
730			if (cp == NULL)
731				goto error;
732			ndig = dtoaend - dtoaresult;
733fp_common:
734			if (signflag)
735				sign = '-';
736			if (expt == INT_MAX) {	/* inf or nan */
737				if (*cp == 'N')
738					cp = (ch >= 'a') ? L"nan" : L"NAN";
739				else
740					cp = (ch >= 'a') ? L"inf" : L"INF";
741 				size = 3;
742				flags &= ~ZEROPAD;
743 				break;
744 			}
745			flags |= FPT;
746 			if (ch == 'g' || ch == 'G') {
747				if (expt > -4 && expt <= prec) {
748					/* Make %[gG] smell like %[fF] */
749					expchar = '\0';
750					if (flags & ALT)
751						prec -= expt;
752					else
753						prec = ndig - expt;
754					if (prec < 0)
755						prec = 0;
756				} else {
757					/*
758					 * Make %[gG] smell like %[eE], but
759					 * trim trailing zeroes if no # flag.
760					 */
761					if (!(flags & ALT))
762						prec = ndig;
763				}
764 			}
765			if (expchar) {
766				expsize = exponent(expstr, expt - 1, expchar);
767				size = expsize + prec;
768				if (prec > 1 || flags & ALT)
769 					++size;
770			} else {
771				/* space for digits before decimal point */
772				if (expt > 0)
773					size = expt;
774				else	/* "0" */
775					size = 1;
776				/* space for decimal pt and following digits */
777				if (prec || flags & ALT)
778					size += prec + 1;
779				lead = expt;
780			}
781			break;
782#endif /* FLOATING_POINT */
783		case 'n': {
784			static const char n_msg[] = ": *wprintf used %n, aborting";
785			char buf[1024], *p;
786
787			/* <10> is LOG_CRIT */
788			strlcpy(buf, "<10>", sizeof buf);
789
790			/* Make sure progname does not fill the whole buffer */
791			strlcat(buf, __progname, sizeof(buf) - sizeof n_msg);
792			strlcat(buf, n_msg, sizeof buf);
793			/*
794			 * vfprintf sends fmt0 via syslog, but this is not
795			 * good behaviour for wide strings.
796			 */
797			if ((p = strchr(buf, '\n')))
798				*p = '\0';
799			sendsyslog(buf, strlen(buf), LOG_CONS);
800			abort();
801			break;
802			}
803		case 'O':
804			flags |= LONGINT;
805			/*FALLTHROUGH*/
806		case 'o':
807			_umax = UARG();
808			base = OCT;
809			goto nosign;
810		case 'p':
811			/*
812			 * ``The argument shall be a pointer to void.  The
813			 * value of the pointer is converted to a sequence
814			 * of printable characters, in an implementation-
815			 * defined manner.''
816			 *	-- ANSI X3J11
817			 */
818			_umax = (u_long)GETARG(void *);
819			base = HEX;
820			xdigs = xdigs_lower;
821			ox[1] = 'x';
822			goto nosign;
823		case 'S':
824			flags |= LONGINT;
825			/*FALLTHROUGH*/
826		case 's':
827			if (flags & LONGINT) {
828				if ((cp = GETARG(wchar_t *)) == NULL) {
829					struct syslog_data sdata = SYSLOG_DATA_INIT;
830					int save_errno = errno;
831
832					syslog_r(LOG_CRIT | LOG_CONS, &sdata,
833					    "vfwprintf %%ls NULL in \"%ls\"", fmt0);
834					errno = save_errno;
835
836					cp = L"(null)";
837				}
838			} else {
839				char *mbsarg;
840				if ((mbsarg = GETARG(char *)) == NULL) {
841					struct syslog_data sdata = SYSLOG_DATA_INIT;
842					int save_errno = errno;
843
844					syslog_r(LOG_CRIT | LOG_CONS, &sdata,
845					    "vfwprintf %%s NULL in \"%ls\"", fmt0);
846					errno = save_errno;
847
848					mbsarg = "(null)";
849				}
850				free(convbuf);
851				convbuf = __mbsconv(mbsarg, prec);
852				if (convbuf == NULL) {
853					fp->_flags |= __SERR;
854					goto error;
855				} else
856					cp = convbuf;
857			}
858			if (prec >= 0) {
859				/*
860				 * can't use wcslen; can only look for the
861				 * NUL in the first `prec' characters, and
862				 * wcslen() will go further.
863				 */
864				wchar_t *p = wmemchr(cp, 0, prec);
865
866				size = p ? (p - cp) : prec;
867			} else {
868				size_t len;
869
870				if ((len = wcslen(cp)) > INT_MAX)
871					goto overflow;
872				size = (int)len;
873			}
874			sign = '\0';
875			break;
876		case 'U':
877			flags |= LONGINT;
878			/*FALLTHROUGH*/
879		case 'u':
880			_umax = UARG();
881			base = DEC;
882			goto nosign;
883		case 'X':
884			xdigs = xdigs_upper;
885			goto hex;
886		case 'x':
887			xdigs = xdigs_lower;
888hex:			_umax = UARG();
889			base = HEX;
890			/* leading 0x/X only if non-zero */
891			if (flags & ALT && _umax != 0)
892				ox[1] = ch;
893
894			/* unsigned conversions */
895nosign:			sign = '\0';
896			/*
897			 * ``... diouXx conversions ... if a precision is
898			 * specified, the 0 flag will be ignored.''
899			 *	-- ANSI X3J11
900			 */
901number:			if ((dprec = prec) >= 0)
902				flags &= ~ZEROPAD;
903
904			/*
905			 * ``The result of converting a zero value with an
906			 * explicit precision of zero is no characters.''
907			 *	-- ANSI X3J11
908			 */
909			cp = buf + BUF;
910			if (_umax != 0 || prec != 0) {
911				/*
912				 * Unsigned mod is hard, and unsigned mod
913				 * by a constant is easier than that by
914				 * a variable; hence this switch.
915				 */
916				switch (base) {
917				case OCT:
918					do {
919						*--cp = to_char(_umax & 7);
920						_umax >>= 3;
921					} while (_umax);
922					/* handle octal leading 0 */
923					if (flags & ALT && *cp != '0')
924						*--cp = '0';
925					break;
926
927				case DEC:
928					/* many numbers are 1 digit */
929					while (_umax >= 10) {
930						*--cp = to_char(_umax % 10);
931						_umax /= 10;
932					}
933					*--cp = to_char(_umax);
934					break;
935
936				case HEX:
937					do {
938						*--cp = xdigs[_umax & 15];
939						_umax >>= 4;
940					} while (_umax);
941					break;
942
943				default:
944					cp = L"bug in vfwprintf: bad base";
945					size = wcslen(cp);
946					goto skipsize;
947				}
948			}
949			size = buf + BUF - cp;
950			if (size > BUF)	/* should never happen */
951				abort();
952		skipsize:
953			break;
954		default:	/* "%?" prints ?, unless ? is NUL */
955			if (ch == '\0')
956				goto done;
957			/* pretend it was %c with argument ch */
958			cp = buf;
959			*cp = ch;
960			size = 1;
961			sign = '\0';
962			break;
963		}
964
965		/*
966		 * All reasonable formats wind up here.  At this point, `cp'
967		 * points to a string which (if not flags&LADJUST) should be
968		 * padded out to `width' places.  If flags&ZEROPAD, it should
969		 * first be prefixed by any sign or other prefix; otherwise,
970		 * it should be blank padded before the prefix is emitted.
971		 * After any left-hand padding and prefixing, emit zeroes
972		 * required by a decimal %[diouxX] precision, then print the
973		 * string proper, then emit zeroes required by any leftover
974		 * floating precision; finally, if LADJUST, pad with blanks.
975		 *
976		 * Compute actual size, so we know how much to pad.
977		 * size excludes decimal prec; realsz includes it.
978		 */
979		realsz = dprec > size ? dprec : size;
980		if (sign)
981			realsz++;
982		if (ox[1])
983			realsz+= 2;
984
985		/* right-adjusting blank padding */
986		if ((flags & (LADJUST|ZEROPAD)) == 0)
987			PAD(width - realsz, blanks);
988
989		/* prefix */
990		if (sign)
991			PRINT(&sign, 1);
992		if (ox[1]) {	/* ox[1] is either x, X, or \0 */
993			ox[0] = '0';
994			PRINT(ox, 2);
995		}
996
997		/* right-adjusting zero padding */
998		if ((flags & (LADJUST|ZEROPAD)) == ZEROPAD)
999			PAD(width - realsz, zeroes);
1000
1001		/* leading zeroes from decimal precision */
1002		PAD(dprec - size, zeroes);
1003
1004		/* the string or number proper */
1005#ifdef FLOATING_POINT
1006		if ((flags & FPT) == 0) {
1007			PRINT(cp, size);
1008		} else {	/* glue together f_p fragments */
1009			if (decimal_point == NULL)
1010				decimal_point = nl_langinfo(RADIXCHAR);
1011			if (!expchar) {	/* %[fF] or sufficiently short %[gG] */
1012				if (expt <= 0) {
1013					PRINT(zeroes, 1);
1014					if (prec || flags & ALT)
1015						PRINT(decimal_point, 1);
1016					PAD(-expt, zeroes);
1017					/* already handled initial 0's */
1018					prec += expt;
1019 				} else {
1020					PRINTANDPAD(cp, convbuf + ndig,
1021					    lead, zeroes);
1022					cp += lead;
1023					if (prec || flags & ALT)
1024						PRINT(decimal_point, 1);
1025				}
1026				PRINTANDPAD(cp, convbuf + ndig, prec, zeroes);
1027			} else {	/* %[eE] or sufficiently long %[gG] */
1028				if (prec > 1 || flags & ALT) {
1029					buf[0] = *cp++;
1030					buf[1] = *decimal_point;
1031					PRINT(buf, 2);
1032					PRINT(cp, ndig-1);
1033					PAD(prec - ndig, zeroes);
1034				} else { /* XeYYY */
1035					PRINT(cp, 1);
1036				}
1037				PRINT(expstr, expsize);
1038			}
1039		}
1040#else
1041		PRINT(cp, size);
1042#endif
1043		/* left-adjusting padding (always blank) */
1044		if (flags & LADJUST)
1045			PAD(width - realsz, blanks);
1046
1047		/* finally, adjust ret */
1048		if (width < realsz)
1049			width = realsz;
1050		if (width > INT_MAX - ret)
1051			goto overflow;
1052		ret += width;
1053	}
1054done:
1055error:
1056	va_end(orgap);
1057	if (__sferror(fp))
1058		ret = -1;
1059	goto finish;
1060
1061overflow:
1062	errno = ENOMEM;
1063	ret = -1;
1064
1065finish:
1066	free(convbuf);
1067#ifdef FLOATING_POINT
1068	if (dtoaresult)
1069		__freedtoa(dtoaresult);
1070#endif
1071	if (argtable != NULL && argtable != statargtable) {
1072		munmap(argtable, argtablesiz);
1073		argtable = NULL;
1074	}
1075	return (ret);
1076}
1077
1078int
1079vfwprintf(FILE * __restrict fp, const wchar_t * __restrict fmt0, __va_list ap)
1080{
1081	int r;
1082
1083	FLOCKFILE(fp);
1084	r = __vfwprintf(fp, fmt0, ap);
1085	FUNLOCKFILE(fp);
1086
1087	return (r);
1088}
1089DEF_STRONG(vfwprintf);
1090
1091/*
1092 * Type ids for argument type table.
1093 */
1094#define T_UNUSED	0
1095#define T_SHORT		1
1096#define T_U_SHORT	2
1097#define TP_SHORT	3
1098#define T_INT		4
1099#define T_U_INT		5
1100#define TP_INT		6
1101#define T_LONG		7
1102#define T_U_LONG	8
1103#define TP_LONG		9
1104#define T_LLONG		10
1105#define T_U_LLONG	11
1106#define TP_LLONG	12
1107#define T_DOUBLE	13
1108#define T_LONG_DOUBLE	14
1109#define TP_CHAR		15
1110#define TP_VOID		16
1111#define T_PTRINT	17
1112#define TP_PTRINT	18
1113#define T_SIZEINT	19
1114#define T_SSIZEINT	20
1115#define TP_SSIZEINT	21
1116#define T_MAXINT	22
1117#define T_MAXUINT	23
1118#define TP_MAXINT	24
1119#define T_CHAR		25
1120#define T_U_CHAR	26
1121#define T_WINT		27
1122#define TP_WCHAR	28
1123
1124/*
1125 * Find all arguments when a positional parameter is encountered.  Returns a
1126 * table, indexed by argument number, of pointers to each arguments.  The
1127 * initial argument table should be an array of STATIC_ARG_TBL_SIZE entries.
1128 * It will be replaced with a mmap-ed one if it overflows (malloc cannot be
1129 * used since we are attempting to make snprintf thread safe, and alloca is
1130 * problematic since we have nested functions..)
1131 */
1132static int
1133__find_arguments(const wchar_t *fmt0, va_list ap, union arg **argtable,
1134    size_t *argtablesiz)
1135{
1136	wchar_t *fmt;		/* format string */
1137	int ch;			/* character from fmt */
1138	int n, n2;		/* handy integer (short term usage) */
1139	wchar_t *cp;		/* handy char pointer (short term usage) */
1140	int flags;		/* flags as above */
1141	unsigned char *typetable; /* table of types */
1142	unsigned char stattypetable[STATIC_ARG_TBL_SIZE];
1143	int tablesize;		/* current size of type table */
1144	int tablemax;		/* largest used index in table */
1145	int nextarg;		/* 1-based argument index */
1146	int ret = 0;		/* return value */
1147
1148	/*
1149	 * Add an argument type to the table, expanding if necessary.
1150	 */
1151#define ADDTYPE(type) \
1152	((nextarg >= tablesize) ? \
1153		__grow_type_table(&typetable, &tablesize) : 0, \
1154	(nextarg > tablemax) ? tablemax = nextarg : 0, \
1155	typetable[nextarg++] = type)
1156
1157#define	ADDSARG() \
1158        ((flags&MAXINT) ? ADDTYPE(T_MAXINT) : \
1159	    ((flags&PTRINT) ? ADDTYPE(T_PTRINT) : \
1160	    ((flags&SIZEINT) ? ADDTYPE(T_SSIZEINT) : \
1161	    ((flags&LLONGINT) ? ADDTYPE(T_LLONG) : \
1162	    ((flags&LONGINT) ? ADDTYPE(T_LONG) : \
1163	    ((flags&SHORTINT) ? ADDTYPE(T_SHORT) : \
1164	    ((flags&CHARINT) ? ADDTYPE(T_CHAR) : ADDTYPE(T_INT))))))))
1165
1166#define	ADDUARG() \
1167        ((flags&MAXINT) ? ADDTYPE(T_MAXUINT) : \
1168	    ((flags&PTRINT) ? ADDTYPE(T_PTRINT) : \
1169	    ((flags&SIZEINT) ? ADDTYPE(T_SIZEINT) : \
1170	    ((flags&LLONGINT) ? ADDTYPE(T_U_LLONG) : \
1171	    ((flags&LONGINT) ? ADDTYPE(T_U_LONG) : \
1172	    ((flags&SHORTINT) ? ADDTYPE(T_U_SHORT) : \
1173	    ((flags&CHARINT) ? ADDTYPE(T_U_CHAR) : ADDTYPE(T_U_INT))))))))
1174
1175	/*
1176	 * Add * arguments to the type array.
1177	 */
1178#define ADDASTER() \
1179	n2 = 0; \
1180	cp = fmt; \
1181	while (is_digit(*cp)) { \
1182		APPEND_DIGIT(n2, *cp); \
1183		cp++; \
1184	} \
1185	if (*cp == '$') { \
1186		int hold = nextarg; \
1187		nextarg = n2; \
1188		ADDTYPE(T_INT); \
1189		nextarg = hold; \
1190		fmt = ++cp; \
1191	} else { \
1192		ADDTYPE(T_INT); \
1193	}
1194	fmt = (wchar_t *)fmt0;
1195	typetable = stattypetable;
1196	tablesize = STATIC_ARG_TBL_SIZE;
1197	tablemax = 0;
1198	nextarg = 1;
1199	memset(typetable, T_UNUSED, STATIC_ARG_TBL_SIZE);
1200
1201	/*
1202	 * Scan the format for conversions (`%' character).
1203	 */
1204	for (;;) {
1205		for (cp = fmt; (ch = *fmt) != '\0' && ch != '%'; fmt++)
1206			continue;
1207		if (ch == '\0')
1208			goto done;
1209		fmt++;		/* skip over '%' */
1210
1211		flags = 0;
1212
1213rflag:		ch = *fmt++;
1214reswitch:	switch (ch) {
1215		case ' ':
1216		case '#':
1217		case '\'':
1218			goto rflag;
1219		case '*':
1220			ADDASTER();
1221			goto rflag;
1222		case '-':
1223		case '+':
1224			goto rflag;
1225		case '.':
1226			if ((ch = *fmt++) == '*') {
1227				ADDASTER();
1228				goto rflag;
1229			}
1230			while (is_digit(ch)) {
1231				ch = *fmt++;
1232			}
1233			goto reswitch;
1234		case '0':
1235			goto rflag;
1236		case '1': case '2': case '3': case '4':
1237		case '5': case '6': case '7': case '8': case '9':
1238			n = 0;
1239			do {
1240				APPEND_DIGIT(n ,ch);
1241				ch = *fmt++;
1242			} while (is_digit(ch));
1243			if (ch == '$') {
1244				nextarg = n;
1245				goto rflag;
1246			}
1247			goto reswitch;
1248#ifdef FLOATING_POINT
1249		case 'L':
1250			flags |= LONGDBL;
1251			goto rflag;
1252#endif
1253		case 'h':
1254			if (*fmt == 'h') {
1255				fmt++;
1256				flags |= CHARINT;
1257			} else {
1258				flags |= SHORTINT;
1259			}
1260			goto rflag;
1261		case 'l':
1262			if (*fmt == 'l') {
1263				fmt++;
1264				flags |= LLONGINT;
1265			} else {
1266				flags |= LONGINT;
1267			}
1268			goto rflag;
1269		case 'q':
1270			flags |= LLONGINT;
1271			goto rflag;
1272		case 't':
1273			flags |= PTRINT;
1274			goto rflag;
1275		case 'z':
1276			flags |= SIZEINT;
1277			goto rflag;
1278		case 'C':
1279			flags |= LONGINT;
1280			/*FALLTHROUGH*/
1281		case 'c':
1282			if (flags & LONGINT)
1283				ADDTYPE(T_WINT);
1284			else
1285				ADDTYPE(T_INT);
1286			break;
1287		case 'D':
1288			flags |= LONGINT;
1289			/*FALLTHROUGH*/
1290		case 'd':
1291		case 'i':
1292			ADDSARG();
1293			break;
1294#ifdef FLOATING_POINT
1295		case 'a':
1296		case 'A':
1297		case 'e':
1298		case 'E':
1299		case 'f':
1300		case 'F':
1301		case 'g':
1302		case 'G':
1303			if (flags & LONGDBL)
1304				ADDTYPE(T_LONG_DOUBLE);
1305			else
1306				ADDTYPE(T_DOUBLE);
1307			break;
1308#endif /* FLOATING_POINT */
1309		case 'n':
1310			if (flags & LLONGINT)
1311				ADDTYPE(TP_LLONG);
1312			else if (flags & LONGINT)
1313				ADDTYPE(TP_LONG);
1314			else if (flags & SHORTINT)
1315				ADDTYPE(TP_SHORT);
1316			else if (flags & PTRINT)
1317				ADDTYPE(TP_PTRINT);
1318			else if (flags & SIZEINT)
1319				ADDTYPE(TP_SSIZEINT);
1320			else if (flags & MAXINT)
1321				ADDTYPE(TP_MAXINT);
1322			else
1323				ADDTYPE(TP_INT);
1324			continue;	/* no output */
1325		case 'O':
1326			flags |= LONGINT;
1327			/*FALLTHROUGH*/
1328		case 'o':
1329			ADDUARG();
1330			break;
1331		case 'p':
1332			ADDTYPE(TP_VOID);
1333			break;
1334		case 'S':
1335			flags |= LONGINT;
1336			/*FALLTHROUGH*/
1337		case 's':
1338			if (flags & LONGINT)
1339				ADDTYPE(TP_CHAR);
1340			else
1341				ADDTYPE(TP_WCHAR);
1342			break;
1343		case 'U':
1344			flags |= LONGINT;
1345			/*FALLTHROUGH*/
1346		case 'u':
1347		case 'X':
1348		case 'x':
1349			ADDUARG();
1350			break;
1351		default:	/* "%?" prints ?, unless ? is NUL */
1352			if (ch == '\0')
1353				goto done;
1354			break;
1355		}
1356	}
1357done:
1358	/*
1359	 * Build the argument table.
1360	 */
1361	if (tablemax >= STATIC_ARG_TBL_SIZE) {
1362		*argtablesiz = sizeof(union arg) * (tablemax + 1);
1363		*argtable = mmap(NULL, *argtablesiz,
1364		    PROT_WRITE|PROT_READ, MAP_ANON|MAP_PRIVATE, -1, 0);
1365		if (*argtable == MAP_FAILED)
1366			return (-1);
1367	}
1368
1369#if 0
1370	/* XXX is this required? */
1371	(*argtable)[0].intarg = 0;
1372#endif
1373	for (n = 1; n <= tablemax; n++) {
1374		switch (typetable[n]) {
1375		case T_UNUSED:
1376		case T_CHAR:
1377		case T_U_CHAR:
1378		case T_SHORT:
1379		case T_U_SHORT:
1380		case T_INT:
1381			(*argtable)[n].intarg = va_arg(ap, int);
1382			break;
1383		case TP_SHORT:
1384			(*argtable)[n].pshortarg = va_arg(ap, short *);
1385			break;
1386		case T_U_INT:
1387			(*argtable)[n].uintarg = va_arg(ap, unsigned int);
1388			break;
1389		case TP_INT:
1390			(*argtable)[n].pintarg = va_arg(ap, int *);
1391			break;
1392		case T_LONG:
1393			(*argtable)[n].longarg = va_arg(ap, long);
1394			break;
1395		case T_U_LONG:
1396			(*argtable)[n].ulongarg = va_arg(ap, unsigned long);
1397			break;
1398		case TP_LONG:
1399			(*argtable)[n].plongarg = va_arg(ap, long *);
1400			break;
1401		case T_LLONG:
1402			(*argtable)[n].longlongarg = va_arg(ap, long long);
1403			break;
1404		case T_U_LLONG:
1405			(*argtable)[n].ulonglongarg = va_arg(ap, unsigned long long);
1406			break;
1407		case TP_LLONG:
1408			(*argtable)[n].plonglongarg = va_arg(ap, long long *);
1409			break;
1410#ifdef FLOATING_POINT
1411		case T_DOUBLE:
1412			(*argtable)[n].doublearg = va_arg(ap, double);
1413			break;
1414		case T_LONG_DOUBLE:
1415			(*argtable)[n].longdoublearg = va_arg(ap, long double);
1416			break;
1417#endif
1418		case TP_CHAR:
1419			(*argtable)[n].pchararg = va_arg(ap, char *);
1420			break;
1421		case TP_VOID:
1422			(*argtable)[n].pvoidarg = va_arg(ap, void *);
1423			break;
1424		case T_PTRINT:
1425			(*argtable)[n].ptrdiffarg = va_arg(ap, ptrdiff_t);
1426			break;
1427		case TP_PTRINT:
1428			(*argtable)[n].pptrdiffarg = va_arg(ap, ptrdiff_t *);
1429			break;
1430		case T_SIZEINT:
1431			(*argtable)[n].sizearg = va_arg(ap, size_t);
1432			break;
1433		case T_SSIZEINT:
1434			(*argtable)[n].ssizearg = va_arg(ap, ssize_t);
1435			break;
1436		case TP_SSIZEINT:
1437			(*argtable)[n].pssizearg = va_arg(ap, ssize_t *);
1438			break;
1439		case TP_MAXINT:
1440			(*argtable)[n].intmaxarg = va_arg(ap, intmax_t);
1441			break;
1442		case T_WINT:
1443			(*argtable)[n].wintarg = va_arg(ap, wint_t);
1444			break;
1445		case TP_WCHAR:
1446			(*argtable)[n].pwchararg = va_arg(ap, wchar_t *);
1447			break;
1448		}
1449	}
1450	goto finish;
1451
1452overflow:
1453	errno = ENOMEM;
1454	ret = -1;
1455
1456finish:
1457	if (typetable != NULL && typetable != stattypetable) {
1458		munmap(typetable, *argtablesiz);
1459		typetable = NULL;
1460	}
1461	return (ret);
1462}
1463
1464/*
1465 * Increase the size of the type table.
1466 */
1467static int
1468__grow_type_table(unsigned char **typetable, int *tablesize)
1469{
1470	unsigned char *oldtable = *typetable;
1471	int newsize = *tablesize * 2;
1472
1473	if (newsize < getpagesize())
1474		newsize = getpagesize();
1475
1476	if (*tablesize == STATIC_ARG_TBL_SIZE) {
1477		*typetable = mmap(NULL, newsize, PROT_WRITE|PROT_READ,
1478		    MAP_ANON|MAP_PRIVATE, -1, 0);
1479		if (*typetable == MAP_FAILED)
1480			return (-1);
1481		bcopy(oldtable, *typetable, *tablesize);
1482	} else {
1483		unsigned char *new = mmap(NULL, newsize, PROT_WRITE|PROT_READ,
1484		    MAP_ANON|MAP_PRIVATE, -1, 0);
1485		if (new == MAP_FAILED)
1486			return (-1);
1487		memmove(new, *typetable, *tablesize);
1488		munmap(*typetable, *tablesize);
1489		*typetable = new;
1490	}
1491	memset(*typetable + *tablesize, T_UNUSED, (newsize - *tablesize));
1492
1493	*tablesize = newsize;
1494	return (0);
1495}
1496
1497
1498#ifdef FLOATING_POINT
1499static int
1500exponent(wchar_t *p0, int exp, int fmtch)
1501{
1502	wchar_t *p, *t;
1503	wchar_t expbuf[MAXEXPDIG];
1504
1505	p = p0;
1506	*p++ = fmtch;
1507	if (exp < 0) {
1508		exp = -exp;
1509		*p++ = '-';
1510	} else
1511		*p++ = '+';
1512	t = expbuf + MAXEXPDIG;
1513	if (exp > 9) {
1514		do {
1515			*--t = to_char(exp % 10);
1516		} while ((exp /= 10) > 9);
1517		*--t = to_char(exp);
1518		for (; t < expbuf + MAXEXPDIG; *p++ = *t++)
1519			/* nothing */;
1520	} else {
1521		/*
1522		 * Exponents for decimal floating point conversions
1523		 * (%[eEgG]) must be at least two characters long,
1524		 * whereas exponents for hexadecimal conversions can
1525		 * be only one character long.
1526		 */
1527		if (fmtch == 'e' || fmtch == 'E')
1528			*p++ = '0';
1529		*p++ = to_char(exp);
1530	}
1531	return (p - p0);
1532}
1533#endif /* FLOATING_POINT */
1534