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NetBSD/lib/libc/stdio/vfwprintf.c

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/* $NetBSD: vfwprintf.c,v 1.3 2005/06/15 09:31:27 he Exp $ */
/*-
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. 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.
*/
#include <sys/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
#if 0
static char sccsid[] = "@(#)vfprintf.c 8.1 (Berkeley) 6/4/93";
__FBSDID("$FreeBSD: src/lib/libc/stdio/vfwprintf.c,v 1.24 2005/04/16 22:36:51 das Exp $");
#else
__RCSID("$NetBSD: vfwprintf.c,v 1.3 2005/06/15 09:31:27 he Exp $");
#endif
#endif /* LIBC_SCCS and not lint */
/*
* Actual wprintf innards.
*
* Avoid making gratuitous changes to this source file; it should be kept
* as close as possible to vfprintf.c for ease of maintenance.
*/
#include "namespace.h"
#include <sys/types.h>
#include <assert.h>
#include <ctype.h>
#include <limits.h>
#include <locale.h>
#include <stdarg.h>
#include <stddef.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <wchar.h>
#include <wctype.h>
#include "reentrant.h"
#include "local.h"
#include "extern.h"
#include "fvwrite.h"
union arg {
int intarg;
u_int uintarg;
long longarg;
u_long ulongarg;
quad_t longlongarg;
u_quad_t ulonglongarg;
ptrdiff_t ptrdiffarg;
size_t sizearg;
intmax_t intmaxarg;
uintmax_t uintmaxarg;
void *pvoidarg;
char *pchararg;
signed char *pschararg;
short *pshortarg;
int *pintarg;
long *plongarg;
quad_t *plonglongarg;
ptrdiff_t *pptrdiffarg;
size_t *psizearg;
intmax_t *pintmaxarg;
#ifndef NO_FLOATING_POINT
double doublearg;
long double longdoublearg;
#endif
wint_t wintarg;
wchar_t *pwchararg;
};
/*
* Type ids for argument type table.
*/
enum typeid {
T_UNUSED, TP_SHORT, T_INT, T_U_INT, TP_INT,
T_LONG, T_U_LONG, TP_LONG, T_LLONG, T_U_LLONG, TP_LLONG,
T_PTRDIFFT, TP_PTRDIFFT, T_SIZET, TP_SIZET,
T_INTMAXT, T_UINTMAXT, TP_INTMAXT, TP_VOID, TP_CHAR, TP_SCHAR,
T_DOUBLE, T_LONG_DOUBLE, T_WINT, TP_WCHAR
};
static int __sbprintf(FILE *, const wchar_t *, va_list);
static wint_t __xfputwc(wchar_t, FILE *);
static wchar_t *__ujtoa(uintmax_t, wchar_t *, int, int, const char *, int,
char, const char *);
static wchar_t *__ultoa(u_long, wchar_t *, int, int, const char *, int,
char, const char *);
static wchar_t *__mbsconv(char *, int);
static void __find_arguments(const wchar_t *, va_list, union arg **);
static void __grow_type_table(int, enum typeid **, int *);
/*
* Helper function for `fprintf to unbuffered unix file': creates a
* temporary buffer. We only work on write-only files; this avoids
* worries about ungetc buffers and so forth.
*/
static int
__sbprintf(FILE *fp, const wchar_t *fmt, va_list ap)
{
int ret;
FILE fake;
unsigned char buf[BUFSIZ];
/* copy the important variables */
fake._flags = fp->_flags & ~__SNBF;
fake._file = fp->_file;
fake._cookie = fp->_cookie;
fake._write = fp->_write;
/* set up the buffer */
fake._bf._base = fake._p = buf;
fake._bf._size = fake._w = sizeof(buf);
fake._lbfsize = 0; /* not actually used, but Just In Case */
/* do the work, then copy any error status */
ret = __vfwprintf_unlocked(&fake, fmt, ap);
if (ret >= 0 && fflush(&fake))
ret = WEOF;
if (fake._flags & __SERR)
fp->_flags |= __SERR;
return (ret);
}
/*
* Like __fputwc, but handles fake string (__SSTR) files properly.
* File must already be locked.
*/
static wint_t
__xfputwc(wchar_t wc, FILE *fp)
{
static const mbstate_t initial;
mbstate_t mbs;
char buf[MB_LEN_MAX];
struct __suio uio;
struct __siov iov;
size_t len;
if ((fp->_flags & __SSTR) == 0)
return (__fputwc_unlock(wc, fp));
mbs = initial;
if ((len = wcrtomb(buf, wc, &mbs)) == (size_t)-1) {
fp->_flags |= __SERR;
return (WEOF);
}
uio.uio_iov = &iov;
uio.uio_resid = len;
uio.uio_iovcnt = 1;
iov.iov_base = buf;
iov.iov_len = len;
return (__sfvwrite(fp, &uio) != EOF ? (wint_t)wc : WEOF);
}
/*
* Macros for converting digits to letters and vice versa
*/
#define to_digit(c) ((c) - '0')
#define is_digit(c) ((unsigned)to_digit(c) <= 9)
#define to_char(n) (wchar_t)((n) + '0')
/*
* Convert an unsigned long to ASCII for printf purposes, returning
* a pointer to the first character of the string representation.
* Octal numbers can be forced to have a leading zero; hex numbers
* use the given digits.
*/
static wchar_t *
__ultoa(u_long val, wchar_t *endp, int base, int octzero, const char *xdigs,
int needgrp, char thousep, const char *grp)
{
wchar_t *cp = endp;
long sval;
int ndig;
/*
* Handle the three cases separately, in the hope of getting
* better/faster code.
*/
switch (base) {
case 10:
if (val < 10) { /* many numbers are 1 digit */
*--cp = to_char(val);
return (cp);
}
ndig = 0;
/*
* On many machines, unsigned arithmetic is harder than
* signed arithmetic, so we do at most one unsigned mod and
* divide; this is sufficient to reduce the range of
* the incoming value to where signed arithmetic works.
*/
if (val > LONG_MAX) {
*--cp = to_char(val % 10);
ndig++;
sval = val / 10;
} else
sval = val;
do {
*--cp = to_char(sval % 10);
ndig++;
/*
* If (*grp == CHAR_MAX) then no more grouping
* should be performed.
*/
if (needgrp && ndig == *grp && *grp != CHAR_MAX
&& sval > 9) {
*--cp = thousep;
ndig = 0;
/*
* If (*(grp+1) == '\0') then we have to
* use *grp character (last grouping rule)
* for all next cases
*/
if (*(grp+1) != '\0')
grp++;
}
sval /= 10;
} while (sval != 0);
break;
case 8:
do {
*--cp = to_char(val & 7);
val >>= 3;
} while (val);
if (octzero && *cp != '0')
*--cp = '0';
break;
case 16:
do {
*--cp = xdigs[(size_t)val & 15];
val >>= 4;
} while (val);
break;
default: /* oops */
abort();
}
return (cp);
}
/* Identical to __ultoa, but for intmax_t. */
static wchar_t *
__ujtoa(uintmax_t val, wchar_t *endp, int base, int octzero,
const char *xdigs, int needgrp, char thousep, const char *grp)
{
wchar_t *cp = endp;
intmax_t sval;
int ndig;
/* quick test for small values; __ultoa is typically much faster */
/* (perhaps instead we should run until small, then call __ultoa?) */
if (val <= ULONG_MAX)
return (__ultoa((u_long)val, endp, base, octzero, xdigs,
needgrp, thousep, grp));
switch (base) {
case 10:
if (val < 10) {
*--cp = to_char(val % 10);
return (cp);
}
ndig = 0;
if (val > INTMAX_MAX) {
*--cp = to_char(val % 10);
ndig++;
sval = val / 10;
} else
sval = val;
do {
*--cp = to_char(sval % 10);
ndig++;
/*
* If (*grp == CHAR_MAX) then no more grouping
* should be performed.
*/
if (needgrp && *grp != CHAR_MAX && ndig == *grp
&& sval > 9) {
*--cp = thousep;
ndig = 0;
/*
* If (*(grp+1) == '\0') then we have to
* use *grp character (last grouping rule)
* for all next cases
*/
if (*(grp+1) != '\0')
grp++;
}
sval /= 10;
} while (sval != 0);
break;
case 8:
do {
*--cp = to_char(val & 7);
val >>= 3;
} while (val);
if (octzero && *cp != '0')
*--cp = '0';
break;
case 16:
do {
*--cp = xdigs[(size_t)val & 15];
val >>= 4;
} while (val);
break;
default:
abort();
}
return (cp);
}
/*
* Convert a multibyte character string argument for the %s format to a wide
* string representation. ``prec'' specifies the maximum number of bytes
* to output. If ``prec'' is greater than or equal to zero, we can't assume
* that the multibyte char. string ends in a null character.
*/
static wchar_t *
__mbsconv(char *mbsarg, int prec)
{
static const mbstate_t initial;
mbstate_t mbs;
wchar_t *convbuf, *wcp;
const char *p;
size_t insize, nchars, nconv;
if (mbsarg == NULL)
return (NULL);
/*
* Supplied argument is a multibyte string; convert it to wide
* characters first.
*/
if (prec >= 0) {
/*
* String is not guaranteed to be NUL-terminated. Find the
* number of characters to print.
*/
p = mbsarg;
insize = nchars = nconv = 0;
mbs = initial;
while (nchars != (size_t)prec) {
nconv = mbrlen(p, MB_CUR_MAX, &mbs);
if (nconv == 0 || nconv == (size_t)-1 ||
nconv == (size_t)-2)
break;
p += nconv;
nchars++;
insize += nconv;
}
if (nconv == (size_t)-1 || nconv == (size_t)-2)
return (NULL);
} else
insize = strlen(mbsarg);
/*
* Allocate buffer for the result and perform the conversion,
* converting at most `size' bytes of the input multibyte string to
* wide characters for printing.
*/
convbuf = malloc((insize + 1) * sizeof(*convbuf));
if (convbuf == NULL)
return (NULL);
wcp = convbuf;
p = mbsarg;
mbs = initial;
nconv = 0;
while (insize != 0) {
nconv = mbrtowc(wcp, p, insize, &mbs);
if (nconv == 0 || nconv == (size_t)-1 || nconv == (size_t)-2)
break;
wcp++;
p += nconv;
insize -= nconv;
}
if (nconv == (size_t)-1 || nconv == (size_t)-2) {
free(convbuf);
return (NULL);
}
*wcp = L'\0';
return (convbuf);
}
/*
* MT-safe version
*/
int
vfwprintf(FILE * __restrict fp, const wchar_t * __restrict fmt0, va_list ap)
{
int ret;
FLOCKFILE(fp);
ret = __vfwprintf_unlocked(fp, fmt0, ap);
FUNLOCKFILE(fp);
return (ret);
}
#ifndef NO_FLOATING_POINT
#define dtoa __dtoa
#define freedtoa __freedtoa
#include <float.h>
#include <math.h>
#include "floatio.h"
#define DEFPREC 6
static int exponent(wchar_t *, int, wchar_t);
static wchar_t *cvt(double, int, int, char *, int *, int, int *);
#endif /* !NO_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. */
/*
* Flags used during conversion.
*/
#define ALT 0x001 /* alternate form */
#define LADJUST 0x004 /* left adjustment */
#define LONGDBL 0x008 /* long double */
#define LONGINT 0x010 /* long integer */
#define LLONGINT 0x020 /* quad_t integer */
#define SHORTINT 0x040 /* short integer */
#define ZEROPAD 0x080 /* zero (as opposed to blank) pad */
#define FPT 0x100 /* Floating point number */
#define GROUPING 0x200 /* use grouping ("'" flag) */
/* C99 additional size modifiers: */
#define SIZET 0x400 /* size_t */
#define PTRDIFFT 0x800 /* ptrdiff_t */
#define INTMAXT 0x1000 /* intmax_t */
#define CHARINT 0x2000 /* print char using int format */
/*
* Non-MT-safe version
*/
int
__vfwprintf_unlocked(FILE *fp, const wchar_t *fmt0, va_list ap)
{
wchar_t *fmt; /* format string */
wchar_t ch; /* character from fmt */
int n, n2, n3; /* handy integer (short term usage) */
wchar_t *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 */
wchar_t sign; /* sign prefix (' ', '+', '-', or \0) */
char thousands_sep; /* locale specific thousands separator */
const char *grouping; /* locale specific numeric grouping rules */
#ifndef NO_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
*/
char *decimal_point; /* locale specific decimal point */
#ifdef notyet
int signflag; /* true if float is negative */
union { /* floating point arguments %[aAeEfFgG] */
double dbl;
long double ldbl;
} fparg;
char *dtoaend; /* pointer to end of converted digits */
char *dtoaresult; /* buffer allocated by dtoa */
#else
double _double; /* double precision arguments %[eEfgG] */
char softsign; /* temporary negative sign for floats */
#endif
int expt; /* integer value of exponent */
char expchar; /* exponent character: [eEpP\0] */
int expsize; /* character count for expstr */
int lead; /* sig figs before decimal or group sep */
int ndig; /* actual number of digits returned by dtoa */
wchar_t expstr[MAXEXPDIG+2]; /* buffer for exponent string: e+ZZZ */
int nseps; /* number of group separators with ' */
int nrepeats; /* number of repeats of the last group */
#endif
u_long ulval; /* integer arguments %[diouxX] */
uintmax_t ujval; /* %j, %ll, %q, %t, %z integers */
int base; /* base for [diouxX] conversion */
int dprec; /* a copy of prec if [diouxX], 0 otherwise */
int realsz; /* field size expanded by dprec, sign, etc */
int size; /* size of converted field or string */
int prsize; /* max size of printed field */
const char *xdigs; /* digits for [xX] conversion */
wchar_t buf[BUF]; /* buffer with space for digits of uintmax_t */
wchar_t ox[2]; /* space for 0x hex-prefix */
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 */
wchar_t *convbuf; /* multibyte to wide conversion result */
/*
* 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 wchar_t blanks[PADSIZE] =
{' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' '};
static wchar_t 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 error' on error, PRINT uses `n2' and
* PAD uses `n'.
*/
#define PRINT(ptr, len) do { \
for (n3 = 0; n3 < (len); n3++) \
__xfputwc((ptr)[n3], fp); \
} while (/*CONSTCOND*/0)
#define PAD(howmany, with) do { \
if ((n = (howmany)) > 0) { \
while (n > PADSIZE) { \
PRINT(with, PADSIZE); \
n -= PADSIZE; \
} \
PRINT(with, n); \
} \
} while (/*CONSTCOND*/0)
#define PRINTANDPAD(p, ep, len, with) do { \
n2 = (ep) - (p); \
if (n2 > (len)) \
n2 = (len); \
if (n2 > 0) \
PRINT((p), n2); \
PAD((len) - (n2 > 0 ? n2 : 0), (with)); \
} while(/*CONSTCOND*/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) \
((/*CONSTCOND*/argtable != NULL) ? *((type*)(void*)(&argtable[nextarg++])) : \
(nextarg++, va_arg(ap, type)))
/*
* To extend shorts properly, we need both signed and unsigned
* argument extraction methods.
*/
#define SARG() \
(flags&LONGINT ? GETARG(long) : \
flags&SHORTINT ? (long)(short)GETARG(int) : \
flags&CHARINT ? (long)(signed char)GETARG(int) : \
(long)GETARG(int))
#define UARG() \
(flags&LONGINT ? GETARG(u_long) : \
flags&SHORTINT ? (u_long)(u_short)GETARG(int) : \
flags&CHARINT ? (u_long)(u_char)GETARG(int) : \
(u_long)GETARG(u_int))
#define INTMAX_SIZE (INTMAXT|SIZET|PTRDIFFT|LLONGINT)
#define SJARG() \
(flags&INTMAXT ? GETARG(intmax_t) : \
flags&SIZET ? (intmax_t)GETARG(size_t) : \
flags&PTRDIFFT ? (intmax_t)GETARG(ptrdiff_t) : \
(intmax_t)GETARG(quad_t))
#define UJARG() \
(flags&INTMAXT ? GETARG(uintmax_t) : \
flags&SIZET ? (uintmax_t)GETARG(size_t) : \
flags&PTRDIFFT ? (uintmax_t)GETARG(ptrdiff_t) : \
(uintmax_t)GETARG(u_quad_t))
/*
* Get * arguments, including the form *nn$. Preserve the nextarg
* that the argument can be gotten once the type is determined.
*/
#define GETASTER(val) \
n2 = 0; \
cp = fmt; \
while (is_digit(*cp)) { \
n2 = 10 * n2 + to_digit(*cp); \
cp++; \
} \
if (*cp == '$') { \
int hold = nextarg; \
if (argtable == NULL) { \
argtable = statargtable; \
__find_arguments (fmt0, orgap, &argtable); \
} \
nextarg = n2; \
val = GETARG (int); \
nextarg = hold; \
fmt = ++cp; \
} else { \
val = GETARG (int); \
}
thousands_sep = '\0';
grouping = NULL;
#ifndef NO_FLOATING_POINT
decimal_point = localeconv()->decimal_point;
expsize = 0; /* XXXGCC -Wuninitialized [sh3,m68000] */
#endif
convbuf = NULL;
/* sorry, fwprintf(read_only_file, L"") returns WEOF, not 0 */
if (cantwrite(fp)) {
errno = EBADF;
return (WEOF);
}
/* optimise fprintf(stderr) (and other unbuffered Unix files) */
if ((fp->_flags & (__SNBF|__SWR|__SRW)) == (__SNBF|__SWR) &&
fp->_file >= 0)
return (__sbprintf(fp, fmt0, ap));
fmt = (wchar_t *)__UNCONST(fmt0);
argtable = NULL;
nextarg = 1;
va_copy(orgap, ap);
ret = 0;
/*
* Scan the format for conversions (`%' character).
*/
for (;;) {
for (cp = fmt; (ch = *fmt) != '\0' && ch != '%'; fmt++)
/* void */;
if ((n = fmt - cp) != 0) {
if ((unsigned)ret + n > INT_MAX) {
ret = EOF;
goto error;
}
PRINT(cp, n);
ret += n;
}
if (ch == '\0')
goto done;
fmt++; /* skip over '%' */
flags = 0;
dprec = 0;
width = 0;
prec = -1;
sign = '\0';
ox[1] = '\0';
expchar = '\0';
lead = 0;
nseps = nrepeats = 0;
ulval = 0;
ujval = 0;
xdigs = NULL;
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 '*':
/*-
* ``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;
width = -width;
/* FALLTHROUGH */
case '-':
flags |= LADJUST;
goto rflag;
case '+':
sign = '+';
goto rflag;
case '\'':
flags |= GROUPING;
thousands_sep = *(localeconv()->thousands_sep);
grouping = localeconv()->grouping;
goto rflag;
case '.':
if ((ch = *fmt++) == '*') {
GETASTER (prec);
goto rflag;
}
prec = 0;
while (is_digit(ch)) {
prec = 10 * prec + to_digit(ch);
ch = *fmt++;
}
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 {
n = 10 * n + to_digit(ch);
ch = *fmt++;
} while (is_digit(ch));
if (ch == '$') {
nextarg = n;
if (argtable == NULL) {
argtable = statargtable;
__find_arguments (fmt0, orgap,
&argtable);
}
goto rflag;
}
width = n;
goto reswitch;
#ifndef NO_FLOATING_POINT
case 'L':
flags |= LONGDBL;
goto rflag;
#endif
case 'h':
if (flags & SHORTINT) {
flags &= ~SHORTINT;
flags |= CHARINT;
} else
flags |= SHORTINT;
goto rflag;
case 'j':
flags |= INTMAXT;
goto rflag;
case 'l':
if (flags & LONGINT) {
flags &= ~LONGINT;
flags |= LLONGINT;
} else
flags |= LONGINT;
goto rflag;
case 'q':
flags |= LLONGINT; /* not necessarily */
goto rflag;
case 't':
flags |= PTRDIFFT;
goto rflag;
case 'z':
flags |= SIZET;
goto rflag;
case 'C':
flags |= LONGINT;
/*FALLTHROUGH*/
case 'c':
if (flags & LONGINT)
*(cp = buf) = (wchar_t)GETARG(wint_t);
else
*(cp = buf) = (wchar_t)btowc(GETARG(int));
size = 1;
sign = '\0';
break;
case 'D':
flags |= LONGINT;
/*FALLTHROUGH*/
case 'd':
case 'i':
if (flags & INTMAX_SIZE) {
ujval = SJARG();
if ((intmax_t)ujval < 0) {
ujval = -ujval;
sign = '-';
}
} else {
ulval = SARG();
if ((long)ulval < 0) {
ulval = -ulval;
sign = '-';
}
}
base = 10;
goto number;
#ifndef NO_FLOATING_POINT
#ifdef notyet
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 (flags & LONGDBL) {
fparg.ldbl = GETARG(long double);
dtoaresult =
__hldtoa(fparg.ldbl, xdigs, prec,
&expt, &signflag, &dtoaend);
} else {
fparg.dbl = GETARG(double);
dtoaresult =
__hdtoa(fparg.dbl, xdigs, prec,
&expt, &signflag, &dtoaend);
}
if (prec < 0)
prec = dtoaend - dtoaresult;
if (expt == INT_MAX)
ox[1] = '\0';
if (convbuf != NULL)
free(convbuf);
ndig = dtoaend - dtoaresult;
cp = convbuf = __mbsconv(dtoaresult, -1);
freedtoa(dtoaresult);
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 (convbuf != NULL)
free(convbuf);
if (flags & LONGDBL) {
fparg.ldbl = GETARG(long double);
dtoaresult =
__ldtoa(&fparg.ldbl, expchar ? 2 : 3, prec,
&expt, &signflag, &dtoaend);
} else {
fparg.dbl = GETARG(double);
dtoaresult =
dtoa(fparg.dbl, expchar ? 2 : 3, prec,
&expt, &signflag, &dtoaend);
if (expt == 9999)
expt = INT_MAX;
}
ndig = dtoaend - dtoaresult;
cp = convbuf = __mbsconv(dtoaresult, -1);
freedtoa(dtoaresult);
fp_common:
if (signflag)
sign = '-';
if (expt == INT_MAX) { /* inf or nan */
if (*cp == 'N') {
cp = (ch >= 'a') ? L"nan" : L"NAN";
sign = '\0';
} else
cp = (ch >= 'a') ? L"inf" : L"INF";
size = 3;
break;
}
#else
case 'e':
case 'E':
case 'f':
case 'F':
case 'g':
case 'G':
if (prec == -1) {
prec = DEFPREC;
} else if ((ch == 'g' || ch == 'G') && prec == 0) {
prec = 1;
}
if (flags & LONGDBL) {
_double = (double) GETARG(long double);
} else {
_double = GETARG(double);
}
/* do this before tricky precision changes */
if (isinf(_double)) {
if (_double < 0)
sign = '-';
if (ch == 'E' || ch == 'F' || ch == 'G')
cp = L"INF";
else
cp = L"inf";
size = 3;
break;
}
if (isnan(_double)) {
if (ch == 'E' || ch == 'F' || ch == 'G')
cp = L"NAN";
else
cp = L"nan";
size = 3;
break;
}
flags |= FPT;
cp = cvt(_double, prec, flags, &softsign,
&expt, ch, &ndig);
if (softsign)
sign = '-';
#endif
flags |= FPT;
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;
if (grouping && expt > 0) {
/* space for thousands' grouping */
nseps = nrepeats = 0;
lead = expt;
while (*grouping != CHAR_MAX) {
if (lead <= *grouping)
break;
lead -= *grouping;
if (*(grouping+1)) {
nseps++;
grouping++;
} else
nrepeats++;
}
size += nseps + nrepeats;
} else
lead = expt;
}
break;
#endif /* !NO_FLOATING_POINT */
case 'n':
/*
* Assignment-like behavior is specified if the
* value overflows or is otherwise unrepresentable.
* C99 says to use `signed char' for %hhn conversions.
*/
if (flags & LLONGINT)
*GETARG(quad_t *) = ret;
else if (flags & SIZET)
*GETARG(ssize_t *) = (ssize_t)ret;
else if (flags & PTRDIFFT)
*GETARG(ptrdiff_t *) = ret;
else if (flags & INTMAXT)
*GETARG(intmax_t *) = ret;
else if (flags & LONGINT)
*GETARG(long *) = ret;
else if (flags & SHORTINT)
*GETARG(short *) = ret;
else if (flags & CHARINT)
*GETARG(signed char *) = ret;
else
*GETARG(int *) = ret;
continue; /* no output */
case 'O':
flags |= LONGINT;
/*FALLTHROUGH*/
case 'o':
if (flags & INTMAX_SIZE)
ujval = UJARG();
else
ulval = UARG();
base = 8;
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
*/
ujval = (uintmax_t)(uintptr_t)GETARG(void *);
base = 16;
xdigs = xdigs_lower;
flags = flags | INTMAXT;
ox[1] = 'x';
goto nosign;
case 'S':
flags |= LONGINT;
/*FALLTHROUGH*/
case 's':
if (flags & LONGINT) {
if ((cp = GETARG(wchar_t *)) == NULL)
cp = L"(null)";
} else {
char *mbp;
if (convbuf != NULL)
free(convbuf);
if ((mbp = GETARG(char *)) == NULL)
cp = L"(null)";
else {
convbuf = __mbsconv(mbp, prec);
if (convbuf == NULL) {
fp->_flags |= __SERR;
goto error;
}
cp = convbuf;
}
}
if (prec >= 0) {
/*
* can't use wcslen; can only look for the
* NUL in the first `prec' characters, and
* wcslen() will go further.
*/
wchar_t *p = wmemchr(cp, 0, (size_t)prec);
if (p != NULL) {
size = p - cp;
if (size > prec)
size = prec;
} else
size = prec;
} else
size = wcslen(cp);
sign = '\0';
break;
case 'U':
flags |= LONGINT;
/*FALLTHROUGH*/
case 'u':
if (flags & INTMAX_SIZE)
ujval = UJARG();
else
ulval = UARG();
base = 10;
goto nosign;
case 'X':
xdigs = xdigs_upper;
goto hex;
case 'x':
xdigs = xdigs_lower;
hex:
if (flags & INTMAX_SIZE)
ujval = UJARG();
else
ulval = UARG();
base = 16;
/* leading 0x/X only if non-zero */
if (flags & ALT &&
(flags & INTMAX_SIZE ? ujval != 0 : ulval != 0))
ox[1] = ch;
flags &= ~GROUPING;
/* 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
*
* ``The C Standard is clear enough as is. The call
* printf("%#.0o", 0) should print 0.''
* -- Defect Report #151
*/
cp = buf + BUF;
if (flags & INTMAX_SIZE) {
if (ujval != 0 || prec != 0 ||
(flags & ALT && base == 8))
cp = __ujtoa(ujval, cp, base,
flags & ALT, xdigs,
flags & GROUPING, thousands_sep,
grouping);
} else {
if (ulval != 0 || prec != 0 ||
(flags & ALT && base == 8))
cp = __ultoa(ulval, cp, base,
flags & ALT, xdigs,
flags & GROUPING, thousands_sep,
grouping);
}
size = buf + BUF - cp;
if (size > BUF) /* should never happen */
abort();
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;
prsize = width > realsz ? width : realsz;
if ((unsigned)ret + prsize > INT_MAX) {
ret = EOF;
goto error;
}
/* 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 */
#ifndef NO_FLOATING_POINT
if ((flags & FPT) == 0) {
PRINT(cp, size);
} else { /* glue together f_p fragments */
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, convbuf + ndig, lead, zeroes);
cp += lead;
if (grouping) {
while (nseps>0 || nrepeats>0) {
if (nrepeats > 0)
nrepeats--;
else {
grouping--;
nseps--;
}
PRINT(&thousands_sep,
1);
PRINTANDPAD(cp,
convbuf + ndig,
*grouping, zeroes);
cp += *grouping;
}
if (cp > convbuf + ndig)
cp = convbuf + ndig;
}
if (prec || flags & ALT) {
buf[0] = *decimal_point;
PRINT(buf, 1);
}
}
PRINTANDPAD(cp, convbuf + ndig, 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 */
ret += prsize;
}
done:
error:
va_end(orgap);
if (convbuf != NULL)
free(convbuf);
if (__sferror(fp))
ret = EOF;
if ((argtable != NULL) && (argtable != statargtable))
free (argtable);
return (ret);
/* NOTREACHED */
}
/*
* 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 replaces with a malloc-ed one if it overflows.
*/
static void
__find_arguments (const wchar_t *fmt0, va_list ap, union arg **argtable)
{
wchar_t *fmt; /* format string */
wchar_t ch; /* character from fmt */
int n, n2; /* handy integer (short term usage) */
wchar_t *cp; /* handy char pointer (short term usage) */
int flags; /* flags as above */
enum typeid *typetable; /* table of types */
enum typeid 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 */
/*
* Add an argument type to the table, expanding if necessary.
*/
#define ADDTYPE(type) \
/*LINTED null effect*/ \
(void)((nextarg >= tablesize) ? \
__grow_type_table(nextarg, &typetable, &tablesize) : (void)0, \
(nextarg > tablemax) ? tablemax = nextarg : 0, \
typetable[nextarg++] = type)
#define ADDSARG() \
(void)((flags&INTMAXT) ? ADDTYPE(T_INTMAXT) : \
((flags&SIZET) ? ADDTYPE(T_SIZET) : \
((flags&PTRDIFFT) ? ADDTYPE(T_PTRDIFFT) : \
((flags&LLONGINT) ? ADDTYPE(T_LLONG) : \
((flags&LONGINT) ? ADDTYPE(T_LONG) : ADDTYPE(T_INT))))))
#define ADDUARG() \
(void)((flags&INTMAXT) ? ADDTYPE(T_UINTMAXT) : \
((flags&SIZET) ? ADDTYPE(T_SIZET) : \
((flags&PTRDIFFT) ? ADDTYPE(T_PTRDIFFT) : \
((flags&LLONGINT) ? ADDTYPE(T_U_LLONG) : \
((flags&LONGINT) ? ADDTYPE(T_U_LONG) : ADDTYPE(T_U_INT))))))
/*
* Add * arguments to the type array.
*/
#define ADDASTER() \
n2 = 0; \
cp = fmt; \
while (is_digit(*cp)) { \
n2 = 10 * n2 + to_digit(*cp); \
cp++; \
} \
if (*cp == '$') { \
int hold = nextarg; \
nextarg = n2; \
ADDTYPE (T_INT); \
nextarg = hold; \
fmt = ++cp; \
} else { \
ADDTYPE (T_INT); \
}
fmt = (wchar_t *)__UNCONST(fmt0);
typetable = stattypetable;
tablesize = STATIC_ARG_TBL_SIZE;
tablemax = 0;
nextarg = 1;
for (n = 0; n < STATIC_ARG_TBL_SIZE; n++)
typetable[n] = T_UNUSED;
/*
* Scan the format for conversions (`%' character).
*/
for (;;) {
for (cp = fmt; (ch = *fmt) != '\0' && ch != '%'; fmt++)
/* void */;
if (ch == '\0')
goto done;
fmt++; /* skip over '%' */
flags = 0;
rflag: ch = *fmt++;
reswitch: switch (ch) {
case ' ':
case '#':
goto rflag;
case '*':
ADDASTER ();
goto rflag;
case '-':
case '+':
case '\'':
goto rflag;
case '.':
if ((ch = *fmt++) == '*') {
ADDASTER ();
goto rflag;
}
while (is_digit(ch)) {
ch = *fmt++;
}
goto reswitch;
case '0':
goto rflag;
case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
n = 0;
do {
n = 10 * n + to_digit(ch);
ch = *fmt++;
} while (is_digit(ch));
if (ch == '$') {
nextarg = n;
goto rflag;
}
goto reswitch;
#ifndef NO_FLOATING_POINT
case 'L':
flags |= LONGDBL;
goto rflag;
#endif
case 'h':
if (flags & SHORTINT) {
flags &= ~SHORTINT;
flags |= CHARINT;
} else
flags |= SHORTINT;
goto rflag;
case 'j':
flags |= INTMAXT;
goto rflag;
case 'l':
if (flags & LONGINT) {
flags &= ~LONGINT;
flags |= LLONGINT;
} else
flags |= LONGINT;
goto rflag;
case 'q':
flags |= LLONGINT; /* not necessarily */
goto rflag;
case 't':
flags |= PTRDIFFT;
goto rflag;
case 'z':
flags |= SIZET;
goto rflag;
case 'C':
flags |= LONGINT;
/*FALLTHROUGH*/
case 'c':
if (flags & LONGINT)
ADDTYPE(T_WINT);
else
ADDTYPE(T_INT);
break;
case 'D':
flags |= LONGINT;
/*FALLTHROUGH*/
case 'd':
case 'i':
ADDSARG();
break;
#ifndef NO_FLOATING_POINT
case 'a':
case 'A':
case 'e':
case 'E':
case 'f':
case 'g':
case 'G':
if (flags & LONGDBL)
ADDTYPE(T_LONG_DOUBLE);
else
ADDTYPE(T_DOUBLE);
break;
#endif /* !NO_FLOATING_POINT */
case 'n':
if (flags & INTMAXT)
ADDTYPE(TP_INTMAXT);
else if (flags & PTRDIFFT)
ADDTYPE(TP_PTRDIFFT);
else if (flags & SIZET)
ADDTYPE(TP_SIZET);
else if (flags & LLONGINT)
ADDTYPE(TP_LLONG);
else if (flags & LONGINT)
ADDTYPE(TP_LONG);
else if (flags & SHORTINT)
ADDTYPE(TP_SHORT);
else if (flags & CHARINT)
ADDTYPE(TP_SCHAR);
else
ADDTYPE(TP_INT);
continue; /* no output */
case 'O':
flags |= LONGINT;
/*FALLTHROUGH*/
case 'o':
ADDUARG();
break;
case 'p':
ADDTYPE(TP_VOID);
break;
case 'S':
flags |= LONGINT;
/*FALLTHROUGH*/
case 's':
if (flags & LONGINT)
ADDTYPE(TP_WCHAR);
else
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 = (union arg *)
malloc (sizeof (union arg) * (tablemax + 1));
}
(*argtable) [0].intarg = 0;
for (n = 1; n <= tablemax; n++) {
switch (typetable [n]) {
case T_UNUSED: /* whoops! */
(*argtable) [n].intarg = va_arg (ap, int);
break;
case TP_SCHAR:
(*argtable) [n].pschararg = va_arg (ap, signed char *);
break;
case TP_SHORT:
(*argtable) [n].pshortarg = va_arg (ap, short *);
break;
case T_INT:
(*argtable) [n].intarg = va_arg (ap, int);
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, quad_t);
break;
case T_U_LLONG:
(*argtable) [n].ulonglongarg = va_arg (ap, u_quad_t);
break;
case TP_LLONG:
(*argtable) [n].plonglongarg = va_arg (ap, quad_t *);
break;
case T_PTRDIFFT:
(*argtable) [n].ptrdiffarg = va_arg (ap, ptrdiff_t);
break;
case TP_PTRDIFFT:
(*argtable) [n].pptrdiffarg = va_arg (ap, ptrdiff_t *);
break;
case T_SIZET:
(*argtable) [n].sizearg = va_arg (ap, size_t);
break;
case TP_SIZET:
(*argtable) [n].psizearg = va_arg (ap, size_t *);
break;
case T_INTMAXT:
(*argtable) [n].intmaxarg = va_arg (ap, intmax_t);
break;
case T_UINTMAXT:
(*argtable) [n].uintmaxarg = va_arg (ap, uintmax_t);
break;
case TP_INTMAXT:
(*argtable) [n].pintmaxarg = va_arg (ap, intmax_t *);
break;
#ifndef NO_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_WINT:
(*argtable) [n].wintarg = va_arg (ap, wint_t);
break;
case TP_WCHAR:
(*argtable) [n].pwchararg = va_arg (ap, wchar_t *);
break;
}
}
if ((typetable != NULL) && (typetable != stattypetable))
free (typetable);
}
/*
* Increase the size of the type table.
*/
static void
__grow_type_table (int nextarg, enum typeid **typetable, int *tablesize)
{
enum typeid *const oldtable = *typetable;
const int oldsize = *tablesize;
enum typeid *newtable;
int n, newsize = oldsize * 2;
if (newsize < nextarg + 1)
newsize = nextarg + 1;
if (oldsize == STATIC_ARG_TBL_SIZE) {
if ((newtable = malloc(newsize * sizeof(enum typeid))) == NULL)
abort(); /* XXX handle better */
bcopy(oldtable, newtable, oldsize * sizeof(enum typeid));
} else {
newtable = realloc(oldtable, newsize * sizeof(enum typeid));
if (newtable == NULL)
abort(); /* XXX handle better */
}
for (n = oldsize; n < newsize; n++)
newtable[n] = T_UNUSED;
*typetable = newtable;
*tablesize = newsize;
}
#ifndef NO_FLOATING_POINT
static wchar_t *
cvt(double value, int ndigits, int flags, char *sign, int *decpt, int ch,
int *length)
{
int mode, dsgn;
char *digits, *bp, *rve;
static wchar_t buf[512];
_DIAGASSERT(decpt != NULL);
_DIAGASSERT(length != NULL);
_DIAGASSERT(sign != NULL);
if (ch == 'f') {
mode = 3; /* ndigits after the decimal point */
} else {
/* To obtain ndigits after the decimal point for the 'e'
* and 'E' formats, round to ndigits + 1 significant
* figures.
*/
if (ch == 'e' || ch == 'E') {
ndigits++;
}
mode = 2; /* ndigits significant digits */
}
digits = __dtoa(value, mode, ndigits, decpt, &dsgn, &rve);
if (dsgn) {
value = -value;
*sign = '-';
} else
*sign = '\000';
if ((ch != 'g' && ch != 'G') || flags & ALT) { /* Print trailing zeros */
bp = digits + ndigits;
if (ch == 'f') {
if (*digits == '0' && value)
*decpt = -ndigits + 1;
bp += *decpt;
}
if (value == 0) /* kludge for __dtoa irregularity */
rve = bp;
while (rve < bp)
*rve++ = '0';
}
*length = rve - digits;
(void)mbstowcs(buf, digits, sizeof(buf)/sizeof(buf[0]));
return buf;
}
static int
exponent(wchar_t *p0, int expo, wchar_t fmtch)
{
wchar_t *p, *t;
wchar_t expbuf[MAXEXPDIG];
p = p0;
*p++ = fmtch;
if (expo < 0) {
expo = -expo;
*p++ = '-';
}
else
*p++ = '+';
t = expbuf + MAXEXPDIG;
if (expo > 9) {
do {
*--t = to_char(expo % 10);
} while ((expo /= 10) > 9);
*--t = to_char(expo);
for (; t < expbuf + MAXEXPDIG; *p++ = *t++);
}
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(expo);
}
return (p - p0);
}
#endif /* !NO_FLOATING_POINT */
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