Adding upstream version 1.9.13p3.upstream/1.9.13p3upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1549 insertions, 0 deletions

diff --git a/lib/util/snprintf.c b/lib/util/snprintf.c
new file mode 100644
index 0000000..8c75ba5
--- /dev/null
+++ b/lib/util/snprintf.c
@@ -0,0 +1,1549 @@
+/*	$OpenBSD: vfprintf.c,v 1.67 2014/12/21 00:23:30 daniel Exp $	*/
+/*
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
+ * Copyright (c) 1999-2005, 2008, 2010-2016
+ *      Todd C. Miller <Todd.Miller@sudo.ws>
+ * Copyright (c) 1990, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Chris Torek.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * From: @(#)vfprintf.c 8.1 (Berkeley) 6/4/93
+ */
+
+/*
+ * v?snprintf/v?asprintf based on OpenBSD vfprintf.c.
+ */
+
+#include <config.h>
+
+#if !defined(HAVE_VSNPRINTF) || !defined(HAVE_SNPRINTF) || \
+    !defined(HAVE_VASPRINTF) || !defined(HAVE_ASPRINTF) || \
+    defined(PREFER_PORTABLE_SNPRINTF)
+
+#include <errno.h>
+#ifdef HAVE_NL_LANGINFO
+# include <langinfo.h>
+#endif
+#include <limits.h>
+#include <stdarg.h>
+#include <stdlib.h>
+#include <stddef.h>
+#if defined(HAVE_STDINT_H)
+# include <stdint.h>
+#elif defined(HAVE_INTTYPES_H)
+# include <inttypes.h>
+#endif
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+#ifdef PRINTF_WIDE_CHAR
+# include <wchar.h>
+#endif
+#include <fcntl.h>
+
+#include "sudo_compat.h"
+#include "sudo_util.h"
+
+/* Avoid printf format attacks by ignoring the %n escape. */
+#define NO_PRINTF_PERCENT_N
+
+union arg {
+	int			intarg;
+	unsigned int		uintarg;
+	long			longarg;
+	unsigned long		ulongarg;
+	long long		longlongarg;
+	unsigned long long	ulonglongarg;
+	ptrdiff_t		ptrdiffarg;
+	size_t			sizearg;
+	ssize_t			ssizearg;
+	intmax_t		intmaxarg;
+	uintmax_t		uintmaxarg;
+	void			*pvoidarg;
+	char			*pchararg;
+	signed char		*pschararg;
+	short			*pshortarg;
+	int			*pintarg;
+	long			*plongarg;
+	long long		*plonglongarg;
+	ptrdiff_t		*pptrdiffarg;
+	ssize_t			*pssizearg;
+	intmax_t		*pintmaxarg;
+#ifdef FLOATING_POINT
+	double			doublearg;
+	long double		longdoublearg;
+#endif
+#ifdef PRINTF_WIDE_CHAR
+	wint_t			wintarg;
+	wchar_t			*pwchararg;
+#endif
+};
+
+static int __find_arguments(const char *fmt0, va_list ap, union arg **argtable);
+static int __grow_type_table(unsigned char **typetable, int *tablesize);
+static int xxxprintf(char **, size_t, int, const char *, va_list);
+
+#ifdef PRINTF_WIDE_CHAR
+/*
+ * Convert a wide character string argument for the %ls format to a multibyte
+ * string representation. If not -1, prec specifies the maximum number of
+ * bytes to output, and also means that we can't assume that the wide char
+ * string is null-terminated.
+ */
+static char *
+__wcsconv(wchar_t *wcsarg, int prec)
+{
+	mbstate_t mbs;
+	char buf[MB_LEN_MAX];
+	wchar_t *p;
+	char *convbuf;
+	size_t clen, nbytes;
+
+	/* Allocate space for the maximum number of bytes we could output. */
+	if (prec < 0) {
+		memset(&mbs, 0, sizeof(mbs));
+		p = wcsarg;
+		nbytes = wcsrtombs(NULL, (const wchar_t **)&p, 0, &mbs);
+		if (nbytes == (size_t)-1)
+			return NULL;
+	} else {
+		/*
+		 * Optimisation: if the output precision is small enough,
+		 * just allocate enough memory for the maximum instead of
+		 * scanning the string.
+		 */
+		if (prec < 128)
+			nbytes = prec;
+		else {
+			nbytes = 0;
+			p = wcsarg;
+			memset(&mbs, 0, sizeof(mbs));
+			for (;;) {
+				clen = wcrtomb(buf, *p++, &mbs);
+				if (clen == 0 || clen == (size_t)-1 ||
+				    nbytes + clen > (size_t)prec)
+					break;
+				nbytes += clen;
+			}
+			if (clen == (size_t)-1)
+				return NULL;
+		}
+	}
+	if ((convbuf = malloc(nbytes + 1)) == NULL)
+		return NULL;
+
+	/* Fill the output buffer. */
+	p = wcsarg;
+	memset(&mbs, 0, sizeof(mbs));
+	if ((nbytes = wcsrtombs(convbuf, (const wchar_t **)&p,
+	    nbytes, &mbs)) == (size_t)-1) {
+		free(convbuf);
+		return NULL;
+	}
+	convbuf[nbytes] = '\0';
+	return convbuf;
+}
+#endif
+
+#ifdef FLOATING_POINT
+#include <float.h>
+#include <locale.h>
+#include <math.h>
+#include "floatio.h"
+#include "gdtoa.h"
+
+#define	DEFPREC		6
+
+static int exponent(char *, int, int);
+#endif /* FLOATING_POINT */
+
+/*
+ * The size of the buffer we use as scratch space for integer
+ * conversions, among other things.  Technically, we would need the
+ * most space for base 10 conversions with thousands' grouping
+ * characters between each pair of digits.  100 bytes is a
+ * conservative overestimate even for a 128-bit uintmax_t.
+ */
+#define BUF	100
+
+#define STATIC_ARG_TBL_SIZE 8	/* Size of static argument table. */
+
+
+/*
+ * Macros for converting digits to letters and vice versa
+ */
+#define	to_digit(c)	((c) - '0')
+#define is_digit(c)	((unsigned int)to_digit(c) <= 9)
+#define	to_char(n)	((n) + '0')
+
+/*
+ * Flags used during conversion.
+ */
+#define	ALT		0x0001		/* alternate form */
+#define	LADJUST		0x0004		/* left adjustment */
+#define	LONGDBL		0x0008		/* long double */
+#define	LONGINT		0x0010		/* long integer */
+#define	LLONGINT	0x0020		/* long long integer */
+#define	SHORTINT	0x0040		/* short integer */
+#define	ZEROPAD		0x0080		/* zero (as opposed to blank) pad */
+#define FPT		0x0100		/* Floating point number */
+#define PTRINT		0x0200		/* (unsigned) ptrdiff_t */
+#define SIZEINT		0x0400		/* (signed) size_t */
+#define CHARINT		0x0800		/* 8 bit integer */
+#undef	MAXINT				/* Also defined by HP-UX param.h... */
+#define MAXINT		0x1000		/* largest integer size (intmax_t) */
+
+/*
+ * Actual printf innards.
+  */
+static int
+xxxprintf(char **strp, size_t strsize, int alloc, const char *fmt0, va_list ap)
+{
+	char *fmt;		/* format string */
+	int ch;			/* character from fmt */
+	int n;			/* handy integers (short term usage) */
+	char *cp;		/* handy char pointer (short term usage) */
+	int flags;		/* flags as above */
+	int ret;		/* return value accumulator */
+	int width;		/* width from format (%8d), or 0 */
+	int prec;		/* precision from format; <0 for N/A */
+	char sign;		/* sign prefix (' ', '+', '-', or \0) */
+#ifdef FLOATING_POINT
+	/*
+	 * We can decompose the printed representation of floating
+	 * point numbers into several parts, some of which may be empty:
+	 *
+	 * [+|-| ] [0x|0X] MMM . NNN [e|E|p|P] [+|-] ZZ
+	 *    A       B     ---C---      D       E   F
+	 *
+	 * A:	'sign' holds this value if present; '\0' otherwise
+	 * B:	ox[1] holds the 'x' or 'X'; '\0' if not hexadecimal
+	 * C:	cp points to the string MMMNNN.  Leading and trailing
+	 *	zeros are not in the string and must be added.
+	 * D:	expchar holds this character; '\0' if no exponent, e.g. %f
+	 * F:	at least two digits for decimal, at least one digit for hex
+	 */
+#ifdef HAVE_NL_LANGINFO
+	const char *decimal_point = NULL;
+#else
+	const char *decimal_point = ".";
+#endif
+	int signflag;		/* true if float is negative */
+	union {			/* floating point arguments %[aAeEfFgG] */
+		double dbl;
+		long double ldbl;
+	} fparg;
+	int expt;		/* integer value of exponent */
+	char expchar;		/* exponent character: [eEpP\0] */
+	char *dtoaend;		/* pointer to end of converted digits */
+	int expsize;		/* character count for expstr */
+	int lead;		/* sig figs before decimal or group sep */
+	int ndig;		/* actual number of digits returned by dtoa */
+	char expstr[MAXEXPDIG+2];	/* buffer for exponent string: e+ZZZ */
+	char *dtoaresult = NULL;
+#endif
+
+	uintmax_t _umax;	/* integer arguments %[diouxX] */
+	enum { OCT, DEC, HEX } base;	/* base for %[diouxX] conversion */
+	int dprec;		/* a copy of prec if %[diouxX], 0 otherwise */
+	int realsz;		/* field size expanded by dprec */
+	int size;		/* size of converted field or string */
+	const char *xdigs = "";	/* digits for %[xX] conversion */
+#define NIOV 8
+	char buf[BUF];		/* buffer with space for digits of uintmax_t */
+	char ox[2];		/* space for 0x; ox[1] is either x, X, or \0 */
+	char *str;		/* pointer to string to fill */
+	char *estr;		/* pointer to last char in str */
+	union arg *argtable;	/* args, built due to positional arg */
+	union arg statargtable[STATIC_ARG_TBL_SIZE];
+	int nextarg;		/* 1-based argument index */
+	va_list orgap;		/* original argument pointer */
+#ifdef PRINTF_WIDE_CHAR
+	char *convbuf;		/* buffer for wide to multi-byte conversion */
+#endif
+
+	/*
+	 * Choose PADSIZE to trade efficiency vs. size.  If larger printf
+	 * fields occur frequently, increase PADSIZE and make the initialisers
+	 * below longer.
+	 */
+#define	PADSIZE	16		/* pad chunk size */
+	static char blanks[PADSIZE] =
+	 {' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' '};
+	static char zeroes[PADSIZE] =
+	 {'0','0','0','0','0','0','0','0','0','0','0','0','0','0','0','0'};
+
+	static const char xdigs_lower[16] = "0123456789abcdef";
+	static const char xdigs_upper[16] = "0123456789ABCDEF";
+
+	/*
+	 * BEWARE, these `goto done' on error, and PAD uses `n'.
+	 */
+	/* Print chars to "str", (allocate as needed if alloc is set). */
+#define	PRINT(ptr, len) do { \
+	const char *p = ptr; \
+	const char *endp = ptr + len; \
+	while (p < endp && (str < estr || alloc)) { \
+		if (alloc && str >= estr) { \
+			char *t; \
+			strsize = (strsize << 1) + 1; \
+			if (!(t = realloc(*strp, strsize))) { \
+				free(str); \
+				*strp = NULL; \
+				ret = -1; \
+				goto done; \
+			} \
+			str = t + (str - *strp); \
+			estr = t + strsize - 1; \
+			*strp = t; \
+		} \
+		*str++ = *p++; \
+	} \
+} while (0)
+
+#define	PAD(plen, pstr) do { \
+	if ((n = (plen)) > 0) { \
+		while (n > PADSIZE) { \
+			PRINT(pstr, PADSIZE); \
+			n -= PADSIZE; \
+		} \
+		PRINT(pstr, n); \
+	} \
+} while (0)
+#define	PRINTANDPAD(p, ep, len, with) do {	\
+	int n2 = (ep) - (p);			\
+	if (n2 > (len))				\
+		n2 = (len);			\
+	if (n2 > 0)				\
+		PRINT((p), n2);			\
+	PAD((len) - (n2 > 0 ? n2 : 0), (with));	\
+} while(0)
+
+	/*
+	 * To extend shorts properly, we need both signed and unsigned
+	 * argument extraction methods.
+	 */
+#define	SARG() \
+	((intmax_t)(flags&MAXINT ? GETARG(intmax_t) : \
+	    flags&LLONGINT ? GETARG(long long) : \
+	    flags&LONGINT ? GETARG(long) : \
+	    flags&PTRINT ? GETARG(ptrdiff_t) : \
+	    flags&SIZEINT ? GETARG(ssize_t) : \
+	    flags&SHORTINT ? (short)GETARG(int) : \
+	    flags&CHARINT ? (signed char)GETARG(int) : \
+	    GETARG(int)))
+#define	UARG() \
+	((uintmax_t)(flags&MAXINT ? GETARG(uintmax_t) : \
+	    flags&LLONGINT ? GETARG(unsigned long long) : \
+	    flags&LONGINT ? GETARG(unsigned long) : \
+	    flags&PTRINT ? (uintptr_t)GETARG(ptrdiff_t) : /* XXX */ \
+	    flags&SIZEINT ? GETARG(size_t) : \
+	    flags&SHORTINT ? (unsigned short)GETARG(int) : \
+	    flags&CHARINT ? (unsigned char)GETARG(int) : \
+	    GETARG(unsigned int)))
+
+	/*
+	 * Append a digit to a value and check for overflow.
+	 */
+#define APPEND_DIGIT(val, dig) do { \
+	if ((val) > INT_MAX / 10) \
+		goto overflow; \
+	(val) *= 10; \
+	if ((val) > INT_MAX - to_digit((dig))) \
+		goto overflow; \
+	(val) += to_digit((dig)); \
+} while (0)
+
+	 /*
+	  * Get * arguments, including the form *nn$.  Preserve the nextarg
+	  * that the argument can be gotten once the type is determined.
+	  */
+#define GETASTER(val) do { \
+	int n2 = 0; \
+	cp = fmt; \
+	while (is_digit(*cp)) { \
+		APPEND_DIGIT(n2, *cp); \
+		cp++; \
+	} \
+	if (*cp == '$') { \
+		int hold = nextarg; \
+		if (argtable == NULL) { \
+			argtable = statargtable; \
+			if (__find_arguments(fmt0, orgap, &argtable) == -1) { \
+				ret = -1; \
+				goto done; \
+			} \
+		} \
+		nextarg = n2; \
+		val = GETARG(int); \
+		nextarg = hold; \
+		fmt = ++cp; \
+	} else { \
+		val = GETARG(int); \
+	} \
+} while (0)
+
+/*
+* Get the argument indexed by nextarg.   If the argument table is
+* built, use it to get the argument.  If its not, get the next
+* argument (and arguments must be gotten sequentially).
+*/
+#define GETARG(type) \
+	((argtable != NULL) ? *((type*)(&argtable[nextarg++])) : \
+		(nextarg++, va_arg(ap, type)))
+
+	fmt = (char *)fmt0;
+	argtable = NULL;
+	nextarg = 1;
+	va_copy(orgap, ap);
+	ret = 0;
+#ifdef PRINTF_WIDE_CHAR
+	convbuf = NULL;
+#endif
+
+	if (alloc) {
+		strsize = 128;
+		*strp = str = malloc(strsize);
+		if (str == NULL) {
+			ret = -1;
+			goto done;
+		}
+		estr = str + 127;
+	} else {
+		str = *strp;
+		if (strsize)
+			estr = str + strsize - 1;
+		else
+			estr = NULL;
+	}
+
+	/*
+	 * Scan the format for conversions (`%' character).
+	 */
+	for (;;) {
+		for (cp = fmt; (ch = *fmt) != '\0' && ch != '%'; fmt++)
+			continue;
+
+		if (fmt != cp) {
+			ptrdiff_t m = fmt - cp;
+			if (m < 0 || m > INT_MAX - ret)
+				goto overflow;
+			PRINT(cp, m);
+			ret += m;
+		}
+		if (ch == '\0')
+			goto done;
+		fmt++;		/* skip over '%' */
+
+		flags = 0;
+		dprec = 0;
+		width = 0;
+		prec = -1;
+		sign = '\0';
+		ox[1] = '\0';
+
+rflag:		ch = *fmt++;
+reswitch:	switch (ch) {
+		case ' ':
+			/*
+			 * ``If the space and + flags both appear, the space
+			 * flag will be ignored.''
+			 *	-- ANSI X3J11
+			 */
+			if (!sign)
+				sign = ' ';
+			goto rflag;
+		case '#':
+			flags |= ALT;
+			goto rflag;
+		case '\'':
+			/* grouping not implemented */
+			goto rflag;
+		case '*':
+			/*
+			 * ``A negative field width argument is taken as a
+			 * - flag followed by a positive field width.''
+			 *	-- ANSI X3J11
+			 * They don't exclude field widths read from args.
+			 */
+			GETASTER(width);
+			if (width >= 0)
+				goto rflag;
+			if (width == INT_MIN)
+				goto overflow;
+			width = -width;
+			FALLTHROUGH;
+		case '-':
+			flags |= LADJUST;
+			goto rflag;
+		case '+':
+			sign = '+';
+			goto rflag;
+		case '.':
+			if ((ch = *fmt++) == '*') {
+				GETASTER(n);
+				prec = n < 0 ? -1 : n;
+				goto rflag;
+			}
+			n = 0;
+			while (is_digit(ch)) {
+				APPEND_DIGIT(n, ch);
+				ch = *fmt++;
+			}
+			if (ch == '$') {
+				nextarg = n;
+				if (argtable == NULL) {
+					argtable = statargtable;
+					if (__find_arguments(fmt0, orgap,
+					    &argtable) == -1) {
+						ret = -1;
+						goto done;
+					}
+				}
+				goto rflag;
+			}
+			prec = n;
+			goto reswitch;
+		case '0':
+			/*
+			 * ``Note that 0 is taken as a flag, not as the
+			 * beginning of a field width.''
+			 *	-- ANSI X3J11
+			 */
+			flags |= ZEROPAD;
+			goto rflag;
+		case '1': case '2': case '3': case '4':
+		case '5': case '6': case '7': case '8': case '9':
+			n = 0;
+			do {
+				APPEND_DIGIT(n, ch);
+				ch = *fmt++;
+			} while (is_digit(ch));
+			if (ch == '$') {
+				nextarg = n;
+				if (argtable == NULL) {
+					argtable = statargtable;
+					if (__find_arguments(fmt0, orgap,
+					    &argtable) == -1) {
+						ret = -1;
+						goto done;
+					}
+				}
+				goto rflag;
+			}
+			width = n;
+			goto reswitch;
+#ifdef FLOATING_POINT
+		case 'L':
+			flags |= LONGDBL;
+			goto rflag;
+#endif
+		case 'h':
+			if (*fmt == 'h') {
+				fmt++;
+				flags |= CHARINT;
+			} else {
+				flags |= SHORTINT;
+			}
+			goto rflag;
+		case 'j':
+			flags |= MAXINT;
+			goto rflag;
+		case 'l':
+			if (*fmt == 'l') {
+				fmt++;
+				flags |= LLONGINT;
+			} else {
+				flags |= LONGINT;
+			}
+			goto rflag;
+		case 'q':
+			flags |= LLONGINT;
+			goto rflag;
+		case 't':
+			flags |= PTRINT;
+			goto rflag;
+		case 'z':
+			flags |= SIZEINT;
+			goto rflag;
+		case 'c':
+#ifdef PRINTF_WIDE_CHAR
+			if (flags & LONGINT) {
+				mbstate_t mbs;
+				size_t mbseqlen;
+
+				memset(&mbs, 0, sizeof(mbs));
+				mbseqlen = wcrtomb(buf,
+				    (wchar_t)GETARG(wint_t), &mbs);
+				if (mbseqlen == (size_t)-1) {
+					ret = -1;
+					goto done;
+				}
+				cp = buf;
+				size = (int)mbseqlen;
+			} else {
+#endif
+				*(cp = buf) = GETARG(int);
+				size = 1;
+#ifdef PRINTF_WIDE_CHAR
+			}
+#endif
+			sign = '\0';
+			break;
+		case 'D':
+			flags |= LONGINT;
+			FALLTHROUGH;
+		case 'd':
+		case 'i':
+			_umax = SARG();
+			if ((intmax_t)_umax < 0) {
+				_umax = -_umax;
+				sign = '-';
+			}
+			base = DEC;
+			goto number;
+#ifdef FLOATING_POINT
+		case 'a':
+		case 'A':
+			if (ch == 'a') {
+				ox[1] = 'x';
+				xdigs = xdigs_lower;
+				expchar = 'p';
+			} else {
+				ox[1] = 'X';
+				xdigs = xdigs_upper;
+				expchar = 'P';
+			}
+			if (prec >= 0)
+				prec++;
+			if (dtoaresult)
+				__freedtoa(dtoaresult);
+			if (flags & LONGDBL) {
+				fparg.ldbl = GETARG(long double);
+				dtoaresult = cp =
+				    __hldtoa(fparg.ldbl, xdigs, prec,
+				    &expt, &signflag, &dtoaend);
+				if (dtoaresult == NULL) {
+					errno = ENOMEM;
+					goto done;
+				}
+			} else {
+				fparg.dbl = GETARG(double);
+				dtoaresult = cp =
+				    __hdtoa(fparg.dbl, xdigs, prec,
+				    &expt, &signflag, &dtoaend);
+				if (dtoaresult == NULL) {
+					errno = ENOMEM;
+					goto done;
+				}
+			}
+			if (prec < 0)
+				prec = dtoaend - cp;
+			if (expt == INT_MAX)
+				ox[1] = '\0';
+			goto fp_common;
+		case 'e':
+		case 'E':
+			expchar = ch;
+			if (prec < 0)	/* account for digit before decpt */
+				prec = DEFPREC + 1;
+			else
+				prec++;
+			goto fp_begin;
+		case 'f':
+		case 'F':
+			expchar = '\0';
+			goto fp_begin;
+		case 'g':
+		case 'G':
+			expchar = ch - ('g' - 'e');
+ 			if (prec == 0)
+ 				prec = 1;
+fp_begin:
+			if (prec < 0)
+				prec = DEFPREC;
+			if (dtoaresult)
+				__freedtoa(dtoaresult);
+			if (flags & LONGDBL) {
+				fparg.ldbl = GETARG(long double);
+				dtoaresult = cp =
+				    __ldtoa(&fparg.ldbl, expchar ? 2 : 3, prec,
+				    &expt, &signflag, &dtoaend);
+				if (dtoaresult == NULL) {
+					errno = ENOMEM;
+					goto done;
+				}
+			} else {
+				fparg.dbl = GETARG(double);
+				dtoaresult = cp =
+				    __dtoa(fparg.dbl, expchar ? 2 : 3, prec,
+				    &expt, &signflag, &dtoaend);
+				if (dtoaresult == NULL) {
+					errno = ENOMEM;
+					goto done;
+				}
+				if (expt == 9999)
+					expt = INT_MAX;
+ 			}
+fp_common:
+			if (signflag)
+				sign = '-';
+			if (expt == INT_MAX) {	/* inf or nan */
+				if (*cp == 'N')
+					cp = (ch >= 'a') ? "nan" : "NAN";
+				else
+					cp = (ch >= 'a') ? "inf" : "INF";
+ 				size = 3;
+				flags &= ~ZEROPAD;
+ 				break;
+ 			}
+			flags |= FPT;
+			ndig = dtoaend - cp;
+ 			if (ch == 'g' || ch == 'G') {
+				if (expt > -4 && expt <= prec) {
+					/* Make %[gG] smell like %[fF] */
+					expchar = '\0';
+					if (flags & ALT)
+						prec -= expt;
+					else
+						prec = ndig - expt;
+					if (prec < 0)
+						prec = 0;
+				} else {
+					/*
+					 * Make %[gG] smell like %[eE], but
+					 * trim trailing zeroes if no # flag.
+					 */
+					if (!(flags & ALT))
+						prec = ndig;
+				}
+ 			}
+			if (expchar) {
+				expsize = exponent(expstr, expt - 1, expchar);
+				size = expsize + prec;
+				if (prec > 1 || flags & ALT)
+ 					++size;
+			} else {
+				/* space for digits before decimal point */
+				if (expt > 0)
+					size = expt;
+				else	/* "0" */
+					size = 1;
+				/* space for decimal pt and following digits */
+				if (prec || flags & ALT)
+					size += prec + 1;
+				lead = expt;
+			}
+			break;
+#endif /* FLOATING_POINT */
+#ifndef NO_PRINTF_PERCENT_N
+		case 'n':
+			if (flags & LLONGINT)
+				*GETARG(long long *) = ret;
+			else if (flags & LONGINT)
+				*GETARG(long *) = ret;
+			else if (flags & SHORTINT)
+				*GETARG(short *) = ret;
+			else if (flags & CHARINT)
+				*GETARG(signed char *) = ret;
+			else if (flags & PTRINT)
+				*GETARG(ptrdiff_t *) = ret;
+			else if (flags & SIZEINT)
+				*GETARG(ssize_t *) = ret;
+			else if (flags & MAXINT)
+				*GETARG(intmax_t *) = ret;
+			else
+				*GETARG(int *) = ret;
+			continue;	/* no output */
+#endif /* NO_PRINTF_PERCENT_N */
+		case 'O':
+			flags |= LONGINT;
+			FALLTHROUGH;
+		case 'o':
+			_umax = UARG();
+			base = OCT;
+			goto nosign;
+		case 'p':
+			/*
+			 * ``The argument shall be a pointer to void.  The
+			 * value of the pointer is converted to a sequence
+			 * of printable characters, in an implementation-
+			 * defined manner.''
+			 *	-- ANSI X3J11
+			 */
+			/* NOSTRICT */
+			_umax = (u_long)GETARG(void *);
+			base = HEX;
+			xdigs = xdigs_lower;
+			ox[1] = 'x';
+			goto nosign;
+		case 's': {
+			size_t len;
+
+#ifdef PRINTF_WIDE_CHAR
+			if (flags & LONGINT) {
+				wchar_t *wcp;
+
+				free(convbuf);
+				convbuf = NULL;
+				if ((wcp = GETARG(wchar_t *)) == NULL) {
+					cp = (char *)"(null)";
+				} else {
+					convbuf = __wcsconv(wcp, prec);
+					if (convbuf == NULL) {
+						ret = -1;
+						goto done;
+					}
+					cp = convbuf;
+				}
+			} else
+#endif /* PRINTF_WIDE_CHAR */
+			if ((cp = GETARG(char *)) == NULL)
+				cp = (char *)"(null)";
+			len = prec >= 0 ? strnlen(cp, prec) : strlen(cp);
+			if (len > INT_MAX)
+				goto overflow;
+			size = (int)len;
+			sign = '\0';
+			}
+			break;
+		case 'U':
+			flags |= LONGINT;
+			FALLTHROUGH;
+		case 'u':
+			_umax = UARG();
+			base = DEC;
+			goto nosign;
+		case 'X':
+			xdigs = xdigs_upper;
+			goto hex;
+		case 'x':
+			xdigs = xdigs_lower;
+hex:			_umax = UARG();
+			base = HEX;
+			/* leading 0x/X only if non-zero */
+			if (flags & ALT && _umax != 0)
+				ox[1] = ch;
+
+			/* unsigned conversions */
+nosign:			sign = '\0';
+			/*
+			 * ``... diouXx conversions ... if a precision is
+			 * specified, the 0 flag will be ignored.''
+			 *	-- ANSI X3J11
+			 */
+number:			if ((dprec = prec) >= 0)
+				flags &= ~ZEROPAD;
+
+			/*
+			 * ``The result of converting a zero value with an
+			 * explicit precision of zero is no characters.''
+			 *	-- ANSI X3J11
+			 */
+			cp = buf + BUF;
+			if (_umax != 0 || prec != 0) {
+				/*
+				 * Unsigned mod is hard, and unsigned mod
+				 * by a constant is easier than that by
+				 * a variable; hence this switch.
+				 */
+				switch (base) {
+				case OCT:
+					do {
+						*--cp = to_char(_umax & 7);
+						_umax >>= 3;
+					} while (_umax);
+					/* handle octal leading 0 */
+					if (flags & ALT && *cp != '0')
+						*--cp = '0';
+					break;
+
+				case DEC:
+					/* many numbers are 1 digit */
+					while (_umax >= 10) {
+						*--cp = to_char(_umax % 10);
+						_umax /= 10;
+					}
+					*--cp = to_char(_umax);
+					break;
+
+				case HEX:
+					do {
+						*--cp = xdigs[_umax & 15];
+						_umax >>= 4;
+					} while (_umax);
+					break;
+
+				default:
+					cp = (char *)"bug in xxxprintf: bad base";
+					size = strlen(cp);
+					goto skipsize;
+				}
+			}
+			size = buf + BUF - cp;
+			if (size > BUF)	/* should never happen */
+				abort();
+		skipsize:
+			break;
+		default:	/* "%?" prints ?, unless ? is NUL */
+			if (ch == '\0')
+				goto done;
+			/* pretend it was %c with argument ch */
+			cp = buf;
+			*cp = ch;
+			size = 1;
+			sign = '\0';
+			break;
+		}
+
+		/*
+		 * All reasonable formats wind up here.  At this point, `cp'
+		 * points to a string which (if not flags&LADJUST) should be
+		 * padded out to `width' places.  If flags&ZEROPAD, it should
+		 * first be prefixed by any sign or other prefix; otherwise,
+		 * it should be blank padded before the prefix is emitted.
+		 * After any left-hand padding and prefixing, emit zeroes
+		 * required by a decimal %[diouxX] precision, then print the
+		 * string proper, then emit zeroes required by any leftover
+		 * floating precision; finally, if LADJUST, pad with blanks.
+		 *
+		 * Compute actual size, so we know how much to pad.
+		 * size excludes decimal prec; realsz includes it.
+		 */
+		realsz = dprec > size ? dprec : size;
+		if (sign)
+			realsz++;
+		if (ox[1])
+			realsz+= 2;
+
+		/* right-adjusting blank padding */
+		if ((flags & (LADJUST|ZEROPAD)) == 0)
+			PAD(width - realsz, blanks);
+
+		/* prefix */
+		if (sign)
+			PRINT(&sign, 1);
+		if (ox[1]) {	/* ox[1] is either x, X, or \0 */
+			ox[0] = '0';
+			PRINT(ox, 2);
+		}
+
+		/* right-adjusting zero padding */
+		if ((flags & (LADJUST|ZEROPAD)) == ZEROPAD)
+			PAD(width - realsz, zeroes);
+
+		/* leading zeroes from decimal precision */
+		PAD(dprec - size, zeroes);
+
+		/* the string or number proper */
+#ifdef FLOATING_POINT
+		if ((flags & FPT) == 0) {
+			PRINT(cp, size);
+		} else {	/* glue together f_p fragments */
+#ifdef HAVE_NL_LANGINFO
+			if (decimal_point == NULL)
+				decimal_point = nl_langinfo(RADIXCHAR);
+#endif
+			if (!expchar) {	/* %[fF] or sufficiently short %[gG] */
+				if (expt <= 0) {
+					PRINT(zeroes, 1);
+					if (prec || flags & ALT)
+						PRINT(decimal_point, 1);
+					PAD(-expt, zeroes);
+					/* already handled initial 0's */
+					prec += expt;
+ 				} else {
+					PRINTANDPAD(cp, dtoaend, lead, zeroes);
+					cp += lead;
+					if (prec || flags & ALT)
+						PRINT(decimal_point, 1);
+				}
+				PRINTANDPAD(cp, dtoaend, prec, zeroes);
+			} else {	/* %[eE] or sufficiently long %[gG] */
+				if (prec > 1 || flags & ALT) {
+					buf[0] = *cp++;
+					buf[1] = *decimal_point;
+					PRINT(buf, 2);
+					PRINT(cp, ndig-1);
+					PAD(prec - ndig, zeroes);
+				} else { /* XeYYY */
+					PRINT(cp, 1);
+				}
+				PRINT(expstr, expsize);
+			}
+		}
+#else
+		PRINT(cp, size);
+#endif
+		/* left-adjusting padding (always blank) */
+		if (flags & LADJUST)
+			PAD(width - realsz, blanks);
+
+		/* finally, adjust ret */
+		if (width < realsz)
+			width = realsz;
+		if (width > INT_MAX - ret)
+			goto overflow;
+		ret += width;
+	}
+done:
+	va_end(orgap);
+	if (strsize)
+		*str = '\0';
+	goto finish;
+
+overflow:
+	errno = EOVERFLOW;
+	ret = -1;
+
+finish:
+#ifdef PRINTF_WIDE_CHAR
+	free(convbuf);
+#endif
+#ifdef FLOATING_POINT
+	if (dtoaresult)
+		__freedtoa(dtoaresult);
+#endif
+	if (argtable != NULL && argtable != statargtable) {
+		sudo_mmap_free(argtable);
+		argtable = NULL;
+	}
+	return ret;
+}
+
+/*
+ * Type ids for argument type table.
+ */
+#define T_UNUSED	0
+#define T_SHORT		1
+#define T_U_SHORT	2
+#define TP_SHORT	3
+#define T_INT		4
+#define T_U_INT		5
+#define TP_INT		6
+#define T_LONG		7
+#define T_U_LONG	8
+#define TP_LONG		9
+#define T_LLONG		10
+#define T_U_LLONG	11
+#define TP_LLONG	12
+#define T_DOUBLE	13
+#define T_LONG_DOUBLE	14
+#define TP_CHAR		15
+#define TP_VOID		16
+#define T_PTRINT	17
+#define TP_PTRINT	18
+#define T_SIZEINT	19
+#define T_SSIZEINT	20
+#define TP_SSIZEINT	21
+#define T_MAXINT	22
+#define T_MAXUINT	23
+#define TP_MAXINT	24
+#define T_CHAR		25
+#define T_U_CHAR	26
+#define T_WINT		27
+#define TP_WCHAR	28
+
+/*
+ * Find all arguments when a positional parameter is encountered.  Returns a
+ * table, indexed by argument number, of pointers to each arguments.  The
+ * initial argument table should be an array of STATIC_ARG_TBL_SIZE entries.
+ * It will be replaced with a mmap-ed one if it overflows (malloc cannot be
+ * used since we are attempting to make snprintf thread safe, and alloca is
+ * problematic since we have nested functions..)
+ */
+static int
+__find_arguments(const char *fmt0, va_list ap, union arg **argtable)
+{
+	char *fmt;		/* format string */
+	int ch;			/* character from fmt */
+	int n;			/* handy integer (short term usage) */
+	char *cp;		/* handy char pointer (short term usage) */
+	int flags;		/* flags as above */
+	unsigned char *typetable; /* table of types */
+	unsigned char stattypetable[STATIC_ARG_TBL_SIZE];
+	int tablesize;		/* current size of type table */
+	int tablemax;		/* largest used index in table */
+	int nextarg;		/* 1-based argument index */
+	int ret = 0;		/* return value */
+
+	/*
+	 * Add an argument type to the table, expanding if necessary.
+	 */
+#define ADDTYPE(type) \
+	((nextarg >= tablesize) ? \
+		__grow_type_table(&typetable, &tablesize) : 0, \
+	(nextarg > tablemax) ? tablemax = nextarg : 0, \
+	typetable[nextarg++] = type)
+
+#define	ADDSARG() \
+	((flags&MAXINT) ? ADDTYPE(T_MAXINT) : \
+	    ((flags&PTRINT) ? ADDTYPE(T_PTRINT) : \
+	    ((flags&SIZEINT) ? ADDTYPE(T_SSIZEINT) : \
+	    ((flags&LLONGINT) ? ADDTYPE(T_LLONG) : \
+	    ((flags&LONGINT) ? ADDTYPE(T_LONG) : \
+	    ((flags&SHORTINT) ? ADDTYPE(T_SHORT) : \
+	    ((flags&CHARINT) ? ADDTYPE(T_CHAR) : ADDTYPE(T_INT))))))))
+
+#define	ADDUARG() \
+	((flags&MAXINT) ? ADDTYPE(T_MAXUINT) : \
+	    ((flags&PTRINT) ? ADDTYPE(T_PTRINT) : \
+	    ((flags&SIZEINT) ? ADDTYPE(T_SIZEINT) : \
+	    ((flags&LLONGINT) ? ADDTYPE(T_U_LLONG) : \
+	    ((flags&LONGINT) ? ADDTYPE(T_U_LONG) : \
+	    ((flags&SHORTINT) ? ADDTYPE(T_U_SHORT) : \
+	    ((flags&CHARINT) ? ADDTYPE(T_U_CHAR) : ADDTYPE(T_U_INT))))))))
+
+	/*
+	 * Add * arguments to the type array.
+	 */
+#define ADDASTER() do { \
+	int n2 = 0; \
+	cp = fmt; \
+	while (is_digit(*cp)) { \
+		APPEND_DIGIT(n2, *cp); \
+		cp++; \
+	} \
+	if (*cp == '$') { \
+		int hold = nextarg; \
+		nextarg = n2; \
+		ADDTYPE(T_INT); \
+		nextarg = hold; \
+		fmt = ++cp; \
+	} else { \
+		ADDTYPE(T_INT); \
+	} \
+} while (0)
+	fmt = (char *)fmt0;
+	typetable = stattypetable;
+	tablesize = STATIC_ARG_TBL_SIZE;
+	tablemax = 0;
+	nextarg = 1;
+	memset(typetable, T_UNUSED, STATIC_ARG_TBL_SIZE);
+
+	/*
+	 * Scan the format for conversions (`%' character).
+	 */
+	for (;;) {
+		for (cp = fmt; (ch = *fmt) != '\0' && ch != '%'; fmt++)
+			continue;
+		if (ch == '\0')
+			goto done;
+		fmt++;		/* skip over '%' */
+
+		flags = 0;
+
+rflag:		ch = *fmt++;
+reswitch:	switch (ch) {
+		case ' ':
+		case '#':
+		case '\'':
+			goto rflag;
+		case '*':
+			ADDASTER();
+			goto rflag;
+		case '-':
+		case '+':
+			goto rflag;
+		case '.':
+			if ((ch = *fmt++) == '*') {
+				ADDASTER();
+				goto rflag;
+			}
+			while (is_digit(ch)) {
+				ch = *fmt++;
+			}
+			goto reswitch;
+		case '0':
+			goto rflag;
+		case '1': case '2': case '3': case '4':
+		case '5': case '6': case '7': case '8': case '9':
+			n = 0;
+			do {
+				APPEND_DIGIT(n ,ch);
+				ch = *fmt++;
+			} while (is_digit(ch));
+			if (ch == '$') {
+				nextarg = n;
+				goto rflag;
+			}
+			goto reswitch;
+#ifdef FLOATING_POINT
+		case 'L':
+			flags |= LONGDBL;
+			goto rflag;
+#endif
+		case 'h':
+			if (*fmt == 'h') {
+				fmt++;
+				flags |= CHARINT;
+			} else {
+				flags |= SHORTINT;
+			}
+			goto rflag;
+		case 'j':
+			flags |= MAXINT;
+			goto rflag;
+		case 'l':
+			if (*fmt == 'l') {
+				fmt++;
+				flags |= LLONGINT;
+			} else {
+				flags |= LONGINT;
+			}
+			goto rflag;
+		case 'q':
+			flags |= LLONGINT;
+			goto rflag;
+		case 't':
+			flags |= PTRINT;
+			goto rflag;
+		case 'z':
+			flags |= SIZEINT;
+			goto rflag;
+		case 'c':
+#ifdef PRINTF_WIDE_CHAR
+			if (flags & LONGINT)
+				ADDTYPE(T_WINT);
+			else
+#endif
+				ADDTYPE(T_INT);
+			break;
+		case 'D':
+			flags |= LONGINT;
+			FALLTHROUGH;
+		case 'd':
+		case 'i':
+			ADDSARG();
+			break;
+#ifdef FLOATING_POINT
+		case 'a':
+		case 'A':
+		case 'e':
+		case 'E':
+		case 'f':
+		case 'F':
+		case 'g':
+		case 'G':
+			if (flags & LONGDBL)
+				ADDTYPE(T_LONG_DOUBLE);
+			else
+				ADDTYPE(T_DOUBLE);
+			break;
+#endif /* FLOATING_POINT */
+#ifndef NO_PRINTF_PERCENT_N
+		case 'n':
+			if (flags & LLONGINT)
+				ADDTYPE(TP_LLONG);
+			else if (flags & LONGINT)
+				ADDTYPE(TP_LONG);
+			else if (flags & SHORTINT)
+				ADDTYPE(TP_SHORT);
+			else if (flags & PTRINT)
+				ADDTYPE(TP_PTRINT);
+			else if (flags & SIZEINT)
+				ADDTYPE(TP_SSIZEINT);
+			else if (flags & MAXINT)
+				ADDTYPE(TP_MAXINT);
+			else
+				ADDTYPE(TP_INT);
+			continue;	/* no output */
+#endif /* NO_PRINTF_PERCENT_N */
+		case 'O':
+			flags |= LONGINT;
+			FALLTHROUGH;
+		case 'o':
+			ADDUARG();
+			break;
+		case 'p':
+			ADDTYPE(TP_VOID);
+			break;
+		case 's':
+#ifdef PRINTF_WIDE_CHAR
+			if (flags & LONGINT)
+				ADDTYPE(TP_WCHAR);
+			else
+#endif
+				ADDTYPE(TP_CHAR);
+			break;
+		case 'U':
+			flags |= LONGINT;
+			FALLTHROUGH;
+		case 'u':
+		case 'X':
+		case 'x':
+			ADDUARG();
+			break;
+		default:	/* "%?" prints ?, unless ? is NUL */
+			if (ch == '\0')
+				goto done;
+			break;
+		}
+	}
+done:
+	/*
+	 * Build the argument table.
+	 */
+	if (tablemax >= STATIC_ARG_TBL_SIZE) {
+		*argtable = sudo_mmap_allocarray(tablemax + 1,
+		    sizeof(union arg));
+		if (*argtable == NULL)
+			return -1;
+	}
+
+	for (n = 1; n <= tablemax; n++) {
+		switch (typetable[n]) {
+		case T_UNUSED:
+		case T_CHAR:
+		case T_U_CHAR:
+		case T_SHORT:
+		case T_U_SHORT:
+		case T_INT:
+			(*argtable)[n].intarg = va_arg(ap, int);
+			break;
+		case TP_SHORT:
+			(*argtable)[n].pshortarg = va_arg(ap, short *);
+			break;
+		case T_U_INT:
+			(*argtable)[n].uintarg = va_arg(ap, unsigned int);
+			break;
+		case TP_INT:
+			(*argtable)[n].pintarg = va_arg(ap, int *);
+			break;
+		case T_LONG:
+			(*argtable)[n].longarg = va_arg(ap, long);
+			break;
+		case T_U_LONG:
+			(*argtable)[n].ulongarg = va_arg(ap, unsigned long);
+			break;
+		case TP_LONG:
+			(*argtable)[n].plongarg = va_arg(ap, long *);
+			break;
+		case T_LLONG:
+			(*argtable)[n].longlongarg = va_arg(ap, long long);
+			break;
+		case T_U_LLONG:
+			(*argtable)[n].ulonglongarg = va_arg(ap, unsigned long long);
+			break;
+		case TP_LLONG:
+			(*argtable)[n].plonglongarg = va_arg(ap, long long *);
+			break;
+#ifdef FLOATING_POINT
+		case T_DOUBLE:
+			(*argtable)[n].doublearg = va_arg(ap, double);
+			break;
+		case T_LONG_DOUBLE:
+			(*argtable)[n].longdoublearg = va_arg(ap, long double);
+			break;
+#endif
+		case TP_CHAR:
+			(*argtable)[n].pchararg = va_arg(ap, char *);
+			break;
+		case TP_VOID:
+			(*argtable)[n].pvoidarg = va_arg(ap, void *);
+			break;
+		case T_PTRINT:
+			(*argtable)[n].ptrdiffarg = va_arg(ap, ptrdiff_t);
+			break;
+		case TP_PTRINT:
+			(*argtable)[n].pptrdiffarg = va_arg(ap, ptrdiff_t *);
+			break;
+		case T_SIZEINT:
+			(*argtable)[n].sizearg = va_arg(ap, size_t);
+			break;
+		case T_SSIZEINT:
+			(*argtable)[n].ssizearg = va_arg(ap, ssize_t);
+			break;
+		case TP_SSIZEINT:
+			(*argtable)[n].pssizearg = va_arg(ap, ssize_t *);
+			break;
+		case T_MAXINT:
+			(*argtable)[n].intmaxarg = va_arg(ap, intmax_t);
+			break;
+		case T_MAXUINT:
+			(*argtable)[n].uintmaxarg = va_arg(ap, uintmax_t);
+			break;
+		case TP_MAXINT:
+			(*argtable)[n].pintmaxarg = va_arg(ap, intmax_t *);
+			break;
+#ifdef PRINTF_WIDE_CHAR
+		case T_WINT:
+			(*argtable)[n].wintarg = va_arg(ap, wint_t);
+			break;
+		case TP_WCHAR:
+			(*argtable)[n].pwchararg = va_arg(ap, wchar_t *);
+			break;
+#endif
+		}
+	}
+	goto finish;
+
+overflow:
+	errno = EOVERFLOW;
+	ret = -1;
+
+finish:
+	if (typetable != NULL && typetable != stattypetable) {
+		sudo_mmap_free(typetable);
+		typetable = NULL;
+	}
+	return ret;
+}
+
+/*
+ * Increase the size of the type table.
+ */
+static int
+__grow_type_table(unsigned char **typetable, int *tablesize)
+{
+	unsigned char *oldtable = *typetable;
+	int newsize = *tablesize * 2;
+
+	if (newsize < sysconf(_SC_PAGESIZE))
+		newsize = sysconf(_SC_PAGESIZE);
+
+	if (*tablesize == STATIC_ARG_TBL_SIZE) {
+		*typetable = sudo_mmap_alloc(newsize);
+		if (*typetable == NULL)
+			return -1;
+		memcpy(*typetable, oldtable, *tablesize);
+	} else {
+		unsigned char *new = sudo_mmap_alloc(newsize);
+		if (new == NULL)
+			return -1;
+		memcpy(new, *typetable, *tablesize);
+		sudo_mmap_free(*typetable);
+		*typetable = new;
+	}
+	memset(*typetable + *tablesize, T_UNUSED, (newsize - *tablesize));
+
+	*tablesize = newsize;
+	return 0;
+}
+
+#ifdef FLOATING_POINT
+static int
+exponent(char *p0, int exp, int fmtch)
+{
+	char *p, *t;
+	char expbuf[MAXEXPDIG];
+
+	p = p0;
+	*p++ = fmtch;
+	if (exp < 0) {
+		exp = -exp;
+		*p++ = '-';
+	} else
+		*p++ = '+';
+	t = expbuf + MAXEXPDIG;
+	if (exp > 9) {
+		do {
+			*--t = to_char(exp % 10);
+		} while ((exp /= 10) > 9);
+		*--t = to_char(exp);
+		for (; t < expbuf + MAXEXPDIG; *p++ = *t++)
+			/* nothing */;
+	} else {
+		/*
+		 * Exponents for decimal floating point conversions
+		 * (%[eEgG]) must be at least two characters long,
+		 * whereas exponents for hexadecimal conversions can
+		 * be only one character long.
+		 */
+		if (fmtch == 'e' || fmtch == 'E')
+			*p++ = '0';
+		*p++ = to_char(exp);
+	}
+	return p - p0;
+}
+#endif /* FLOATING_POINT */
+
+#if !defined(HAVE_VSNPRINTF) || defined(PREFER_PORTABLE_SNPRINTF)
+int
+sudo_vsnprintf(char *str, size_t n, const char *fmt, va_list ap)
+{
+	if (n > INT_MAX) {
+		errno = EOVERFLOW;
+		*str = '\0';
+		return -1;
+	}
+	return xxxprintf(&str, n, 0, fmt, ap);
+}
+#endif /* !HAVE_VSNPRINTF || PREFER_PORTABLE_SNPRINTF */
+
+#if !defined(HAVE_SNPRINTF) || defined(PREFER_PORTABLE_SNPRINTF)
+int
+sudo_snprintf(char *str, size_t n, char const *fmt, ...)
+{
+	int ret;
+	va_list ap;
+
+	if (n > INT_MAX) {
+		errno = EOVERFLOW;
+		*str = '\0';
+		return -1;
+	}
+	va_start(ap, fmt);
+	ret = xxxprintf(&str, n, 0, fmt, ap);
+	va_end(ap);
+	return ret;
+}
+#endif /* !HAVE_SNPRINTF || PREFER_PORTABLE_SNPRINTF */
+
+#if !defined(HAVE_VASPRINTF) || defined(PREFER_PORTABLE_SNPRINTF)
+int
+sudo_vasprintf(char **str, const char *fmt, va_list ap)
+{
+	int ret;
+
+	ret = xxxprintf(str, 0, 1, fmt, ap);
+	if (ret == -1)
+		*str = NULL;
+	return ret;
+}
+#endif /* !HAVE_VASPRINTF || PREFER_PORTABLE_SNPRINTF */
+
+#if !defined(HAVE_ASPRINTF) || defined(PREFER_PORTABLE_SNPRINTF)
+int
+sudo_asprintf(char **str, char const *fmt, ...)
+{
+	int ret;
+	va_list ap;
+
+	va_start(ap, fmt);
+	ret = xxxprintf(str, 0, 1, fmt, ap);
+	va_end(ap);
+	if (ret == -1)
+		*str = NULL;
+	return ret;
+}
+#endif /* !HAVE_ASPRINTF || PREFER_PORTABLE_SNPRINTF */
+
+#endif /* !HAVE_VSNPRINTF || !HAVE_SNPRINTF || !HAVE_VASPRINTF || !HAVE_ASPRINTF || PREFER_PORTABLE_SNPRINTF */