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/*

FUNCTION

<<vprintf>>, <<vfprintf>>, <<vsprintf>>---format argument list

INDEX

        vprintf

INDEX

        vfprintf

INDEX

        vsprintf

INDEX

        vsnprintf

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 _vprintf_r(void *<[reent]>, const char *<[fmt]>,

                        va_list <[list]>);

        int _vfprintf_r(void *<[reent]>, FILE *<[fp]>, const char *<[fmt]>,

                        va_list <[list]>);

        int _vsprintf_r(void *<[reent]>, char *<[str]>, const char *<[fmt]>,

                        va_list <[list]>);

        int _vsnprintf_r(void *<[reent]>, char *<[str]>, size_t <[size]>, const char *<[fmt]>,

                        va_list <[list]>);

TRAD_SYNOPSIS

        #include <stdio.h>

        #include <varargs.h>

        int vprintf( <[fmt]>, <[list]>)

        char *<[fmt]>;

        va_list <[list]>;

        int vfprintf(<[fp]>, <[fmt]>, <[list]>)

        FILE *<[fp]>;

        char *<[fmt]>;

        va_list <[list]>;

        int vsprintf(<[str]>, <[fmt]>, <[list]>)

        char *<[str]>;

        char *<[fmt]>;

        va_list <[list]>;

        int vsnprintf(<[str]>, <[size]>, <[fmt]>, <[list]>)

        char *<[str]>;

        size_t <[size]>;

        char *<[fmt]>;

        va_list <[list]>;

        int _vprintf_r(<[reent]>, <[fmt]>, <[list]>)

        char *<[reent]>;

        char *<[fmt]>;

        va_list <[list]>;

        int _vfprintf_r(<[reent]>, <[fp]>, <[fmt]>, <[list]>)

        char *<[reent]>;

        FILE *<[fp]>;

        char *<[fmt]>;

        va_list <[list]>;

        int _vsprintf_r(<[reent]>, <[str]>, <[fmt]>, <[list]>)

        char *<[reent]>;

        char *<[str]>;

        char *<[fmt]>;

        va_list <[list]>;

        int _vsnprintf_r(<[reent]>, <[str]>, <[size]>, <[fmt]>, <[list]>)

        char *<[reent]>;

        char *<[str]>;

        size_t <[size]>;

        char *<[fmt]>;

        va_list <[list]>;

DESCRIPTION

<<vprintf>>, <<vfprintf>>, <<vsprintf>> and <<vsnprintf>> are (respectively)

variants of <<printf>>, <<fprintf>>, <<sprintf>> and <<snprintf>>.  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.

RETURNS

The return values are consistent with the corresponding functions:

<<vsprintf>> returns the number of bytes in the output string,

save that the concluding <<NULL>> is not counted.

<<vprintf>> and <<vfprintf>> return the number of characters transmitted.

If an error occurs, <<vprintf>> and <<vfprintf>> return <<EOF>>. No

error returns occur for <<vsprintf>>.

PORTABILITY

ANSI C requires all three functions.

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

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

*/

/*-

 * 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.

 */

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

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

static char *rcsid = "$Id: vfprintf.c,v 1.2 2000-09-05 17:10:19 joel Exp $";

#endif /* LIBC_SCCS and not lint */

/*

 * Actual printf innards.

 *

 * This code is large and complicated...

 */

#ifdef INTEGER_ONLY

#define VFPRINTF vfiprintf

#define _VFPRINTF_R _vfiprintf_r

#else

#define VFPRINTF vfprintf

#define _VFPRINTF_R _vfprintf_r

#define FLOATING_POINT

#endif

#define _NO_LONGLONG

#if defined WANT_PRINTF_LONG_LONG && defined __GNUC__

# undef _NO_LONGLONG

#endif

#include <_ansi.h>

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <reent.h>

#ifdef _HAVE_STDC

#include <stdarg.h>

#else

#include <varargs.h>

#endif

#include "local.h"

#include "fvwrite.h"

#include "vfieeefp.h"

/*

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

 * then reset it so that it can be reused.

 */

static int

__sprint(fp, uio)

        FILE *fp;

        register struct __suio *uio;

{

        register int err;

        if (uio->uio_resid == 0) {

                uio->uio_iovcnt = 0;

                return (0);

        }

        err = __sfvwrite(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

__sbprintf(fp, fmt, ap)

        register FILE *fp;

        const char *fmt;

        va_list ap;

{

        int ret;

        FILE fake;

        unsigned char buf[BUFSIZ];

        /* copy the important variables */

        fake._data = fp->_data;

        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 = VFPRINTF(&fake, fmt, ap);

        if (ret >= 0 && fflush(&fake))

                ret = EOF;

        if (fake._flags & __SERR)

                fp->_flags |= __SERR;

        return (ret);

}

#ifdef FLOATING_POINT

#include <locale.h>

#include <math.h>

#include "floatio.h"

#define BUF             (MAXEXP+MAXFRACT+1)     /* + decimal point */

#define DEFPREC         6

static char *cvt _PARAMS((struct _reent *, double, int, int, char *, int *, int, int *));

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

#else /* no FLOATING_POINT */

#define BUF             40

#endif /* FLOATING_POINT */

/*

 * 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; unimplemented */

#define LONGINT         0x010           /* long integer */

#define QUADINT         0x020           /* quad integer */

#define SHORTINT        0x040           /* short integer */

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

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

int

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

        FILE * fp _AND

        _CONST char *fmt0 _AND

        va_list ap)

{

  return _VFPRINTF_R (fp->_data, fp, fmt0, ap);

}

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 */

        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) */

        wchar_t wc;

#ifdef FLOATING_POINT

        char *decimal_point = localeconv()->decimal_point;

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

        /*

         * Although it is natural to declare this double here, the

         * declaration causes gcc to save FP registers even when not

         * printing an FP number.  This results in surprising use

         * of FP registers to print integers or strings on at least the

         * PowerPC.  A more proper solution would be to move FP printing

         * to another file, but this does seem to work.

         */

#if 0

        double _double;         /* double precision arguments %[eEfgG] */

#else

                                /* double precision arguments %[eEfgG] */

        union { int i; double d; } _double_ = {0};

#define _double (_double_.d)

#endif

        int expt;               /* integer value of exponent */

        int expsize;            /* character count for expstr */

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

        char expstr[7];         /* buffer for exponent string */

#endif

#ifndef _NO_LONGLONG

#define quad_t    long long

#define u_quad_t  unsigned long long

#endif

#ifndef _NO_LONGLONG

        u_quad_t _uquad;        /* integer arguments %[diouxX] */

#else

        u_long _uquad;

#endif

        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;            /* 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, %[diouxX], %[eEfgG] */

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

        int state = 0;          /* mbtowc calls from library must not change state */

        /*

         * 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'};

        /*

         * 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(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(fp, &uio)) \

                goto error; \

        uio.uio_iovcnt = 0; \

        iovp = iov; \

}

        /*

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

         * argument extraction methods.

         */

#ifndef _NO_LONGLONG

#define SARG() \

        (flags&QUADINT ? va_arg(ap, quad_t) : \

            flags&LONGINT ? va_arg(ap, long) : \

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

            (long)va_arg(ap, int))

#define UARG() \

        (flags&QUADINT ? va_arg(ap, u_quad_t) : \

            flags&LONGINT ? va_arg(ap, u_long) : \

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

            (u_long)va_arg(ap, u_int))

#else

#define SARG() \

        (flags&LONGINT ? va_arg(ap, long) : \

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

            (long)va_arg(ap, int))

#define UARG() \

        (flags&LONGINT ? va_arg(ap, u_long) : \

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

            (u_long)va_arg(ap, u_int))

#endif

        CHECK_INIT (fp);

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

        if (cantwrite(fp))

                return (EOF);

        /* 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 = (char *)fmt0;

        uio.uio_iov = iovp = iov;

        uio.uio_resid = 0;

        uio.uio_iovcnt = 0;

        ret = 0;

        /*

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

         */

        for (;;) {

                cp = fmt;

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

                        fmt += n;

                        if (wc == '%') {

                                fmt--;

                                break;

                        }

                }

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

                        PRINT(cp, m);

                        ret += m;

                }

                if (n <= 0)

                        goto done;

                fmt++;          /* skip over '%' */

                flags = 0;

                dprec = 0;

                width = 0;

                prec = -1;

                sign = '\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 '*':

                        /*

                         * ``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.

                         */

                        if ((width = va_arg(ap, int)) >= 0)

                                goto rflag;

                        width = -width;

                        /* FALLTHROUGH */

                case '-':

                        flags |= LADJUST;

                        goto rflag;

                case '+':

                        sign = '+';

                        goto rflag;

                case '.':

                        if ((ch = *fmt++) == '*') {

                                n = va_arg(ap, int);

                                prec = n < 0 ? -1 : n;

                                goto rflag;

                        }

                        n = 0;

                        while (is_digit(ch)) {

                                n = 10 * n + to_digit(ch);

                                ch = *fmt++;

                        }

                        prec = n < 0 ? -1 : 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 {

                                n = 10 * n + to_digit(ch);

                                ch = *fmt++;

                        } while (is_digit(ch));

                        width = n;

                        goto reswitch;

#ifdef FLOATING_POINT

                case 'L':

                        flags |= LONGDBL;

                        goto rflag;

#endif

                case 'h':

                        flags |= SHORTINT;

                        goto rflag;

                case 'l':

                        if (*fmt == 'l') {

                                fmt++;

                                flags |= QUADINT;

                        } else {

                                flags |= LONGINT;

                        }

                        goto rflag;

                case 'q':

                        flags |= QUADINT;

                        goto rflag;

                case 'c':

                        *(cp = buf) = va_arg(ap, int);

                        size = 1;

                        sign = '\0';

                        break;

                case 'D':

                        flags |= LONGINT;

                        /*FALLTHROUGH*/

                case 'd':

                case 'i':

                        _uquad = SARG();

#ifndef _NO_LONGLONG

                        if ((quad_t)_uquad < 0)

#else

                        if ((long) _uquad < 0)

#endif

                        {

                                _uquad = -_uquad;

                                sign = '-';

                        }

                        base = DEC;

                        goto number;

#ifdef FLOATING_POINT

                case 'e':

                case 'E':

                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) va_arg(ap, long double);

                        } else {

                                _double = va_arg(ap, double);

                        }

                        /* do this before tricky precision changes */

                        if (isinf(_double)) {

                                if (_double < 0)

                                        sign = '-';

                                cp = "Inf";

                                size = 3;

                                break;

                        }

                        if (isnan(_double)) {

                                cp = "NaN";

                                size = 3;

                                break;

                        }

                        flags |= FPT;

                        cp = cvt(data, _double, prec, flags, &softsign,

                                &expt, ch, &ndig);

                        if (ch == 'g' || ch == 'G') {

                                if (expt <= -4 || expt > prec)

                                        ch = (ch == 'g') ? 'e' : 'E';

                                else

                                        ch = 'g';

                        }

                        if (ch <= 'e') {        /* 'e' or 'E' fmt */

                                --expt;

                                expsize = exponent(expstr, expt, ch);

                                size = expsize + ndig;

                                if (ndig > 1 || flags & ALT)

                                        ++size;

                        } else if (ch == 'f') {         /* f fmt */

                                if (expt > 0) {

                                        size = expt;

                                        if (prec || flags & ALT)

                                                size += prec + 1;

                                } else  /* "0.X" */

                                        size = prec + 2;

                        } else if (expt >= ndig) {      /* fixed g fmt */

                                size = expt;

                                if (flags & ALT)

                                        ++size;

                        } else

                                size = ndig + (expt > 0 ?

                                        1 : 2 - expt);

                        if (softsign)

                                sign = '-';

                        break;

#endif /* FLOATING_POINT */

                case 'n':

#ifndef _NO_LONGLONG

                        if (flags & QUADINT)

                                *va_arg(ap, quad_t *) = ret;

                        else

#endif

                        if (flags & LONGINT)

                                *va_arg(ap, long *) = ret;

                        else if (flags & SHORTINT)

                                *va_arg(ap, short *) = ret;

                        else

                                *va_arg(ap, int *) = ret;

                        continue;       /* no output */

                case 'O':

                        flags |= LONGINT;

                        /*FALLTHROUGH*/

                case 'o':

                        _uquad = 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 */

                        _uquad = (u_long)(unsigned _POINTER_INT)va_arg(ap, void *);

                        base = HEX;

                        xdigs = "0123456789abcdef";

                        flags |= HEXPREFIX;

                        ch = 'x';

                        goto nosign;

                case 's':

                        if ((cp = va_arg(ap, char *)) == NULL)

                                cp = "(null)";

                        if (prec >= 0) {

                                /*

                                 * can't use strlen; can only look for the

                                 * NUL in the first `prec' characters, and

                                 * strlen() will go further.

                                 */

                                char *p = memchr(cp, 0, prec);

                                if (p != NULL) {

                                        size = p - cp;

                                        if (size > prec)

                                                size = prec;

                                } else

                                        size = prec;

                        } else

                                size = strlen(cp);

                        sign = '\0';

                        break;

                case 'U':

                        flags |= LONGINT;

                        /*FALLTHROUGH*/

                case 'u':

                        _uquad = UARG();

                        base = DEC;

                        goto nosign;

                case 'X':

                        xdigs = "0123456789ABCDEF";

                        goto hex;

                case 'x':

                        xdigs = "0123456789abcdef";

hex:                    _uquad = UARG();

                        base = HEX;

                        /* leading 0x/X only if non-zero */

                        if (flags & ALT && _uquad != 0)

                                flags |= HEXPREFIX;

                        /* unsigned conversions */

nosign:                 sign = '\0';

                        /*

                         * ``... diouXx conversions ... if a precision is

                         * specified, the 0 flag will be ignored.''