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/*

 * Copyright (c) 1990 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.

 */

/*

FUNCTION

<<vfprintf>>, <<vprintf>>, <<vsprintf>>, <<vsnprintf>>, <<vasprintf>>, <<vasnprintf>>---format argument list

INDEX

        vfprintf

INDEX

        _vfprintf_r

INDEX

        vprintf

INDEX

        _vprintf_r

INDEX

        vsprintf

INDEX

        _vsprintf_r

INDEX

        vsnprintf

INDEX

        _vsnprintf_r

INDEX

        vasprintf

INDEX

        _vasprintf_r

INDEX

        vasnprintf

INDEX

        _vasnprintf_r

ANSI_SYNOPSIS

        #include <stdio.h>

        #include <stdarg.h>

        int vprintf(const char *<[fmt]>, va_list <[list]>);

        int vfprintf(FILE *<[fp]>, const char *<[fmt]>, va_list <[list]>);

        int vsprintf(char *<[str]>, const char *<[fmt]>, va_list <[list]>);

        int vsnprintf(char *<[str]>, size_t <[size]>, const char *<[fmt]>,

                      va_list <[list]>);

        int vasprintf(char **<[strp]>, const char *<[fmt]>, va_list <[list]>);

        char *vasnprintf(char *<[str]>, size_t *<[size]>, const char *<[fmt]>,

                         va_list <[list]>);

        int _vprintf_r(struct _reent *<[reent]>, const char *<[fmt]>,

                        va_list <[list]>);

        int _vfprintf_r(struct _reent *<[reent]>, FILE *<[fp]>,

                        const char *<[fmt]>, va_list <[list]>);

        int _vsprintf_r(struct _reent *<[reent]>, char *<[str]>,

                        const char *<[fmt]>, va_list <[list]>);

        int _vasprintf_r(struct _reent *<[reent]>, char **<[str]>,

                         const char *<[fmt]>, va_list <[list]>);

        int _vsnprintf_r(struct _reent *<[reent]>, char *<[str]>,

                         size_t <[size]>, const char *<[fmt]>, va_list <[list]>);

        char *_vasnprintf_r(struct _reent *<[reent]>, char *<[str]>,

                            size_t *<[size]>, const char *<[fmt]>, va_list <[list]>);

DESCRIPTION

<<vprintf>>, <<vfprintf>>, <<vasprintf>>, <<vsprintf>>, <<vsnprintf>>,

and <<vasnprintf>> are (respectively) variants of <<printf>>,

<<fprintf>>, <<asprintf>>, <<sprintf>>, <<snprintf>>, and

<<asnprintf>>.  They differ only in allowing their caller to pass the

variable argument list as a <<va_list>> object (initialized by

<<va_start>>) rather than directly accepting a variable number of

arguments.  The caller is responsible for calling <<va_end>>.

<<_vprintf_r>>, <<_vfprintf_r>>, <<_vasprintf_r>>, <<_vsprintf_r>>,

<<_vsnprintf_r>>, and <<_vasnprintf_r>> are reentrant versions of the

above.

RETURNS

The return values are consistent with the corresponding functions.

PORTABILITY

ANSI C requires <<vprintf>>, <<vfprintf>>, <<vsprintf>>, and

<<vsnprintf>>.  The remaining functions are newlib extensions.

Supporting OS subroutines required: <<close>>, <<fstat>>, <<isatty>>,

<<lseek>>, <<read>>, <<sbrk>>, <<write>>.

*/

#if defined(LIBC_SCCS) && !defined(lint)

/*static char *sccsid = "from: @(#)vfprintf.c   5.50 (Berkeley) 12/16/92";*/

static char *rcsid = "$Id: vfprintf.c 148 2010-06-30 19:21:22Z jeremybennett $";

#endif /* LIBC_SCCS and not lint */

/*

 * Actual printf innards.

 *

 * This code is large and complicated...

 */

#include <newlib.h>

#ifdef INTEGER_ONLY

# define VFPRINTF vfiprintf

# ifdef STRING_ONLY

#   define _VFPRINTF_R _svfiprintf_r

# else

#   define _VFPRINTF_R _vfiprintf_r

# endif

#else

# define VFPRINTF vfprintf

# ifdef STRING_ONLY

#   define _VFPRINTF_R _svfprintf_r

# else

#   define _VFPRINTF_R _vfprintf_r

# endif

# ifndef NO_FLOATING_POINT

#  define FLOATING_POINT

# endif

#endif

#define _NO_POS_ARGS

#ifdef _WANT_IO_POS_ARGS

# undef _NO_POS_ARGS

#endif

#include <_ansi.h>

#include <reent.h>

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <limits.h>

#include <stdint.h>

#include <wchar.h>

#include <sys/lock.h>

#include <stdarg.h>

#include "local.h"

#include "fvwrite.h"

#include "vfieeefp.h"

/* Currently a test is made to see if long double processing is warranted.

   This could be changed in the future should the _ldtoa_r code be

   preferred over _dtoa_r.  */

#define _NO_LONGDBL

#if defined _WANT_IO_LONG_DOUBLE && (LDBL_MANT_DIG > DBL_MANT_DIG)

#undef _NO_LONGDBL

#endif

#define _NO_LONGLONG

#if defined _WANT_IO_LONG_LONG \

        && (defined __GNUC__ || __STDC_VERSION__ >= 199901L)

# undef _NO_LONGLONG

#endif

#ifdef STRING_ONLY

static int

_DEFUN(__sprint_r, (ptr, fp, uio),

       struct _reent *ptr _AND

       FILE *fp _AND

       register struct __suio *uio)

{

        register size_t len;

        register int w;

        register struct __siov *iov;

        register _CONST char *p = NULL;

        iov = uio->uio_iov;

        len = 0;

        if (uio->uio_resid == 0) {

                uio->uio_iovcnt = 0;

                return (0);

        }

        do {

                while (len == 0) {

                        p = iov->iov_base;

                        len = iov->iov_len;

                        iov++;

                }

                w = fp->_w;

                if (len >= w && fp->_flags & (__SMBF | __SOPT)) {

                        /* must be asprintf family */

                        unsigned char *str;

                        int curpos = (fp->_p - fp->_bf._base);

                        /* Choose a geometric growth factor to avoid

                         * quadratic realloc behavior, but use a rate less

                         * than (1+sqrt(5))/2 to accomodate malloc

                         * overhead. asprintf EXPECTS us to overallocate, so

                         * that it can add a trailing \0 without

                         * reallocating.  The new allocation should thus be

                         * max(prev_size*1.5, curpos+len+1). */

                        int newsize = fp->_bf._size * 3 / 2;

                        if (newsize < curpos + len + 1)

                                newsize = curpos + len + 1;

                        if (fp->_flags & __SOPT)

                        {

                                /* asnprintf leaves original buffer alone.  */

                                str = (unsigned char *)_malloc_r (ptr, newsize);

                                if (!str)

                                {

                                        ptr->_errno = ENOMEM;

                                        goto err;

                                }

                                memcpy (str, fp->_bf._base, curpos);

                                fp->_flags = (fp->_flags & ~__SOPT) | __SMBF;

                        }

                        else

                        {

                                str = (unsigned char *)_realloc_r (ptr, fp->_bf._base,

                                                newsize);

                                if (!str) {

                                        /* Free unneeded buffer.  */

                                        _free_r (ptr, fp->_bf._base);

                                        /* Ensure correct errno, even if free

                                         * changed it.  */

                                        ptr->_errno = ENOMEM;

                                        goto err;

                                }

                        }

                        fp->_bf._base = str;

                        fp->_p = str + curpos;

                        fp->_bf._size = newsize;

                        w = len;

                        fp->_w = newsize - curpos;

                }

                if (len < w)

                        w = len;

                (void)memmove ((_PTR) fp->_p, (_PTR) p, (size_t) (w));

                fp->_w -= w;

                fp->_p += w;

                w = len;          /* pretend we copied all */

                p += w;

                len -= w;

        } while ((uio->uio_resid -= w) != 0);

        uio->uio_resid = 0;

        uio->uio_iovcnt = 0;

        return 0;

err:

  fp->_flags |= __SERR;

  uio->uio_resid = 0;

  uio->uio_iovcnt = 0;

  return EOF;

}

#else /* !STRING_ONLY */

/*

 * Flush out all the vectors defined by the given uio,

 * then reset it so that it can be reused.

 */

static int

_DEFUN(__sprint_r, (ptr, fp, uio),

       struct _reent *ptr _AND

       FILE *fp _AND

       register struct __suio *uio)

{

        register int err;

        if (uio->uio_resid == 0) {

                uio->uio_iovcnt = 0;

                return (0);

        }

        err = __sfvwrite_r(ptr, fp, uio);

        uio->uio_resid = 0;

        uio->uio_iovcnt = 0;

        return (err);

}

/*

 * 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

_DEFUN(__sbprintf, (rptr, fp, fmt, ap),

       struct _reent *rptr _AND

       register FILE *fp   _AND

       _CONST char *fmt  _AND

       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 */

#ifndef __SINGLE_THREAD__

        __lock_init_recursive (fake._lock);

#endif

        /* do the work, then copy any error status */

        ret = _VFPRINTF_R (rptr, &fake, fmt, ap);

        if (ret >= 0 && _fflush_r (rptr, &fake))

                ret = EOF;

        if (fake._flags & __SERR)

                fp->_flags |= __SERR;

#ifndef __SINGLE_THREAD__

        __lock_close_recursive (fake._lock);

#endif

        return (ret);

}

#endif /* !STRING_ONLY */

#ifdef FLOATING_POINT

# include <locale.h>

# include <math.h>

/* For %La, an exponent of 15 bits occupies the exponent character, a

   sign, and up to 5 digits.  */

# define MAXEXPLEN              7

# define DEFPREC                6

# ifdef _NO_LONGDBL

extern char *_dtoa_r _PARAMS((struct _reent *, double, int,

                              int, int *, int *, char **));

#  define _PRINTF_FLOAT_TYPE double

#  define _DTOA_R _dtoa_r

#  define FREXP frexp

# else /* !_NO_LONGDBL */

extern char *_ldtoa_r _PARAMS((struct _reent *, _LONG_DOUBLE, int,

                              int, int *, int *, char **));

extern int _EXFUN(_ldcheck,(_LONG_DOUBLE *));

#  define _PRINTF_FLOAT_TYPE _LONG_DOUBLE

#  define _DTOA_R _ldtoa_r

/* FIXME - frexpl is not yet supported; and cvt infloops if (double)f

   converts a finite value into infinity.  */

/* #  define FREXP frexpl */

#  define FREXP(f,e) ((_LONG_DOUBLE) frexp ((double)f, e))

# endif /* !_NO_LONGDBL */

static char *cvt(struct _reent *, _PRINTF_FLOAT_TYPE, int, int, char *, int *,

                 int, int *, char *);

static int exponent(char *, int, int);

#endif /* FLOATING_POINT */

/* BUF must be big enough for the maximum %#llo (assuming long long is

   at most 64 bits, this would be 23 characters), the maximum

   multibyte character %C, and the maximum default precision of %La

   (assuming long double is at most 128 bits with 113 bits of

   mantissa, this would be 29 characters).  %e, %f, and %g use

   reentrant storage shared with mprec.  All other formats that use

   buf get by with fewer characters.  Making BUF slightly bigger

   reduces the need for malloc in %.*a and %S, when large precision or

   long strings are processed.  */

#define BUF             40

#if defined _MB_CAPABLE && MB_LEN_MAX > BUF

# undef BUF

# define BUF MB_LEN_MAX

#endif

#ifndef _NO_LONGLONG

# define quad_t long long

# define u_quad_t unsigned long long

#else

# define quad_t long

# define u_quad_t unsigned long

#endif

typedef quad_t * quad_ptr_t;

typedef _PTR     void_ptr_t;

typedef char *   char_ptr_t;

typedef long *   long_ptr_t;

typedef int  *   int_ptr_t;

typedef short *  short_ptr_t;

#ifndef _NO_POS_ARGS

# ifdef NL_ARGMAX

#  define MAX_POS_ARGS NL_ARGMAX

# else

#  define MAX_POS_ARGS 32

# endif

union arg_val

{

  int val_int;

  u_int val_u_int;

  long val_long;

  u_long val_u_long;

  float val_float;

  double val_double;

  _LONG_DOUBLE val__LONG_DOUBLE;

  int_ptr_t val_int_ptr_t;

  short_ptr_t val_short_ptr_t;

  long_ptr_t val_long_ptr_t;

  char_ptr_t val_char_ptr_t;

  quad_ptr_t val_quad_ptr_t;

  void_ptr_t val_void_ptr_t;

  quad_t val_quad_t;

  u_quad_t val_u_quad_t;

  wint_t val_wint_t;

};

static union arg_val *

_EXFUN(get_arg, (struct _reent *data, int n, char *fmt,

                 va_list *ap, int *numargs, union arg_val *args,

                 int *arg_type, char **last_fmt));

#endif /* !_NO_POS_ARGS */

/*

 * 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)      ((n) + '0')

/*

 * Flags used during conversion.

 */

#define ALT             0x001           /* alternate form */

#define HEXPREFIX       0x002           /* add 0x or 0X prefix */

#define LADJUST         0x004           /* left adjustment */

#define LONGDBL         0x008           /* long double */

#define LONGINT         0x010           /* long integer */

#ifndef _NO_LONGLONG

# define QUADINT        0x020           /* quad integer */

#else /* ifdef _NO_LONGLONG, make QUADINT equivalent to LONGINT, so

         that %lld behaves the same as %ld, not as %d, as expected if:

         sizeof (long long) = sizeof long > sizeof int  */

# define QUADINT        LONGINT

#endif

#define SHORTINT        0x040           /* short integer */

#define ZEROPAD         0x080           /* zero (as opposed to blank) pad */

#define FPT             0x100           /* Floating point number */

#ifdef _WANT_IO_C99_FORMATS

# define CHARINT        0x200           /* char as integer */

#else /* define as 0, to make SARG and UARG occupy fewer instructions  */

# define CHARINT        0

#endif

int _EXFUN(_VFPRINTF_R, (struct _reent *, FILE *, _CONST char *, va_list));

#ifndef STRING_ONLY

int

_DEFUN(VFPRINTF, (fp, fmt0, ap),

       FILE * fp         _AND

       _CONST char *fmt0 _AND

       va_list ap)

{

  int result;

  result = _VFPRINTF_R (_REENT, fp, fmt0, ap);

  return result;

}

#endif /* STRING_ONLY */

int

_DEFUN(_VFPRINTF_R, (data, fp, fmt0, ap),

       struct _reent *data _AND

       FILE * fp           _AND

       _CONST char *fmt0   _AND

       va_list ap)

{

        register char *fmt;     /* format string */

        register int ch;        /* character from fmt */

        register int n, m;      /* handy integers (short term usage) */

        register char *cp;      /* handy char pointer (short term usage) */

        register struct __siov *iovp;/* for PRINT macro */

        register int flags;     /* flags as above */

        char *fmt_anchor;       /* current format spec being processed */

#ifndef _NO_POS_ARGS

        int N;                  /* arg number */

        int arg_index;          /* index into args processed directly */

        int numargs;            /* number of varargs read */

        char *saved_fmt;        /* saved fmt pointer */

        union arg_val args[MAX_POS_ARGS];

        int arg_type[MAX_POS_ARGS];

        int is_pos_arg;         /* is current format positional? */

        int old_is_pos_arg;     /* is current format positional? */

#endif

        int ret;                /* return value accumulator */

        int width;              /* width from format (%8d), or 0 */

        int prec;               /* precision from format (%.3d), or -1 */

        char sign;              /* sign prefix (' ', '+', '-', or \0) */

#ifdef FLOATING_POINT

        char *decimal_point = _localeconv_r (data)->decimal_point;

        char softsign;          /* temporary negative sign for floats */

        union { int i; _PRINTF_FLOAT_TYPE fp; } _double_ = {0};

# define _fpvalue (_double_.fp)

        int expt;               /* integer value of exponent */

        int expsize = 0; /* character count for expstr */

        int ndig = 0;            /* actual number of digits returned by cvt */

        char expstr[MAXEXPLEN]; /* buffer for exponent string */

#endif /* FLOATING_POINT */

        u_quad_t _uquad;        /* 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 */

        char *xdigs = NULL;     /* digits for [xX] conversion */

#define NIOV 8

        struct __suio uio;      /* output information: summary */

        struct __siov iov[NIOV];/* ... and individual io vectors */

        char buf[BUF];          /* space for %c, %S, %[diouxX], %[aA] */

        char ox[2];             /* space for 0x hex-prefix */

#ifdef _MB_CAPABLE

        wchar_t wc;

        mbstate_t state;        /* mbtowc calls from library must not change state */

#endif

        char *malloc_buf = NULL;/* handy pointer for malloced buffers */

        /*

         * 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 _CONST char blanks[PADSIZE] =

         {' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' '};

        static _CONST char zeroes[PADSIZE] =

         {'0','0','0','0','0','0','0','0','0','0','0','0','0','0','0','0'};

#ifdef _MB_CAPABLE

        memset (&state, '\0', sizeof (state));

#endif

        /*

         * BEWARE, these `goto error' on error, and PAD uses `n'.

         */

#define PRINT(ptr, len) { \

        iovp->iov_base = (ptr); \

        iovp->iov_len = (len); \

        uio.uio_resid += (len); \

        iovp++; \

        if (++uio.uio_iovcnt >= NIOV) { \

                if (__sprint_r(data, fp, &uio)) \

                        goto error; \

                iovp = iov; \

        } \

}

#define PAD(howmany, with) { \

        if ((n = (howmany)) > 0) { \

                while (n > PADSIZE) { \

                        PRINT (with, PADSIZE); \

                        n -= PADSIZE; \

                } \

                PRINT (with, n); \

        } \

}

#define FLUSH() { \

        if (uio.uio_resid && __sprint_r(data, fp, &uio)) \

                goto error; \

        uio.uio_iovcnt = 0; \

        iovp = iov; \

}

        /* Macros to support positional arguments */

#ifndef _NO_POS_ARGS

# define GET_ARG(n, ap, type)                                           \

        (is_pos_arg                                                     \

         ? (n < numargs                                                 \

            ? args[n].val_##type                                        \

            : get_arg (data, n, fmt_anchor, &ap, &numargs, args,        \

                       arg_type, &saved_fmt)->val_##type)               \

         : (arg_index++ < numargs                                       \

            ? args[n].val_##type                                        \

            : (numargs < MAX_POS_ARGS                                   \

               ? args[numargs++].val_##type = va_arg (ap, type)         \

               : va_arg (ap, type))))

#else

# define GET_ARG(n, ap, type) (va_arg (ap, type))

#endif

        /*

         * To extend shorts properly, we need both signed and unsigned

         * argument extraction methods.

         */

#ifndef _NO_LONGLONG

#define SARG() \

        (flags&QUADINT ? GET_ARG (N, ap, quad_t) : \

            flags&LONGINT ? GET_ARG (N, ap, long) : \

            flags&SHORTINT ? (long)(short)GET_ARG (N, ap, int) : \

            flags&CHARINT ? (long)(signed char)GET_ARG (N, ap, int) : \

            (long)GET_ARG (N, ap, int))

#define UARG() \

        (flags&QUADINT ? GET_ARG (N, ap, u_quad_t) : \

            flags&LONGINT ? GET_ARG (N, ap, u_long) : \

            flags&SHORTINT ? (u_long)(u_short)GET_ARG (N, ap, int) : \

            flags&CHARINT ? (u_long)(unsigned char)GET_ARG (N, ap, int) : \

            (u_long)GET_ARG (N, ap, u_int))

#else

#define SARG() \

        (flags&LONGINT ? GET_ARG (N, ap, long) : \

            flags&SHORTINT ? (long)(short)GET_ARG (N, ap, int) : \

            flags&CHARINT ? (long)(signed char)GET_ARG (N, ap, int) : \

            (long)GET_ARG (N, ap, int))

#define UARG() \

        (flags&LONGINT ? GET_ARG (N, ap, u_long) : \

            flags&SHORTINT ? (u_long)(u_short)GET_ARG (N, ap, int) : \

            flags&CHARINT ? (u_long)(unsigned char)GET_ARG (N, ap, int) : \

            (u_long)GET_ARG (N, ap, u_int))

#endif

#ifndef STRING_ONLY

        /* Initialize std streams if not dealing with sprintf family.  */

        CHECK_INIT (data, fp);

        _flockfile (fp);

        ORIENT(fp, -1);

        /* sorry, fprintf(read_only_file, "") returns EOF, not 0 */

        if (cantwrite (data, fp)) {

                _funlockfile (fp);

                return (EOF);

        }

        /* optimise fprintf(stderr) (and other unbuffered Unix files) */

        if ((fp->_flags & (__SNBF|__SWR|__SRW)) == (__SNBF|__SWR) &&

            fp->_file >= 0) {

                _funlockfile (fp);

                return (__sbprintf (data, fp, fmt0, ap));

        }

#else /* STRING_ONLY */

        /* Create initial buffer if we are called by asprintf family.  */

        if (fp->_flags & __SMBF && !fp->_bf._base)

        {

                fp->_bf._base = fp->_p = _malloc_r (data, 64);

                if (!fp->_p)

                {

                        data->_errno = ENOMEM;

                        return EOF;

                }

                fp->_bf._size = 64;

        }

#endif /* STRING_ONLY */

        fmt = (char *)fmt0;

        uio.uio_iov = iovp = iov;

        uio.uio_resid = 0;

        uio.uio_iovcnt = 0;

        ret = 0;

#ifndef _NO_POS_ARGS

        arg_index = 0;

        saved_fmt = NULL;

        arg_type[0] = -1;

        numargs = 0;

        is_pos_arg = 0;

#endif

        /*

         * Scan the format for conversions (`%' character).

         */

        for (;;) {

                cp = fmt;

#ifdef _MB_CAPABLE

                while ((n = _mbtowc_r (data, &wc, fmt, MB_CUR_MAX, &state)) > 0) {

                    if (wc == '%')

                        break;

                    fmt += n;

                }

#else

                while (*fmt != '\0' && *fmt != '%')

                    fmt += 1;

#endif

                if ((m = fmt - cp) != 0) {

                        PRINT (cp, m);

                        ret += m;

                }

#ifdef _MB_CAPABLE

                if (n <= 0)

                    goto done;

#else

                if (*fmt == '\0')

                    goto done;