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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.
 */
 
#define INTEGER_ONLY
#define _HAVE_STDC_
#define _NOLONGLONG
#define u_long unsigned long
#define u_short unsigned short
#define u_int unsigned int
#define _uquad_t u_long
#define _POINTER_INT int
#define _CONST const
#define NULL 0
 
#include "common.h"
#include "support.h"
 
#if defined(LIBC_SCCS) && !defined(lint)
/*static char *sccsid = "from: @(#)vfprintf.c   5.50 (Berkeley) 12/16/92";*/
static char *rcsid = "$Id: cprintf.c,v 1.2 2002-04-19 11:08:25 markom 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 <stdarg.h>
 
#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 */
 
        /*
         * 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' };
 
inline void pc(_CONST char c)
{
#ifdef OR1K
        putc(c);
#else
        printf("%c", c);
#endif
}
 
        /*
         * BEWARE, these `goto error' on error, and PAD uses `n'.
         */
inline void PRINT(_CONST char *ptr, int len)
{
        int i;
        for (i = 0; i < len; i++)
                pc(*(ptr++));
}
 
inline void PAD(int howmany, _CONST char *with)
{
        int n;
        if ((n = howmany) > 0) {
                while (n > PADSIZE) {
                        PRINT(with, PADSIZE);
                        n -= PADSIZE;
                }
                PRINT(with, n);
        }
}
 
int printf(const char *fmt0, ...)
{
        register char *fmt;     /* format string */
        register int ch;        /* character from fmt */
        int n;                  /* handy integers (short term usage) */
        register char *cp;      /* handy char pointer (short term usage) */
        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) */
        va_list ap;
 
#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 = (char *)0; /* digits for [xX] conversion */
#define NIOV 8
 
        char buf[BUF];          /* space for %c, %[diouxX], %[eEfgG] */
        char ox[2];             /* space for 0x hex-prefix */
 
#define FLUSH()
 
        /*
         * 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
 
        va_start(ap, fmt0);
        fmt = (char *)fmt0;
        ret = 0;
 
        /*
         * Scan the format for conversions (`%' character).
         */
        for (;;) {
 
                while (*fmt != 0 && *fmt != '%') {
                        pc(*fmt);
                        fmt++;
                        ret++;
                }
                if (!*fmt)
                        goto done;
 
                fmt++;          /* Skip % */
                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 = (char *)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.''
                         *      -- 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 (_uquad != 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(_uquad & 7);
                                                _uquad >>= 3;
                                        } while (_uquad);
                                        /* handle octal leading 0 */
                                        if (flags & ALT && *cp != '0')
                                                *--cp = '0';
                                        break;
 
                                case DEC:
                                        /* many numbers are 1 digit */
                                        while (_uquad >= 10) {
                                                *--cp = to_char(_uquad % 10);
                                                _uquad /= 10;
                                        }
                                        *--cp = to_char(_uquad);
                                        break;
 
                                case HEX:
                                        do {
                                                *--cp = xdigs[_uquad & 15];
                                                _uquad >>= 4;
                                        } while (_uquad);
                                        break;
 
                                default:
                                        cp = "bug in vfprintf: bad base";
                                        size = strlen(cp);
                                        goto skipsize;
                                }
                        }
                        size = buf + BUF - cp;
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++;
                else if (flags & HEXPREFIX)
                        realsz += 2;
 
                /* right-adjusting blank padding */
                if ((flags & (LADJUST | ZEROPAD)) == 0)
                        PAD(width - realsz, blanks);
 
                /* prefix */
                if (sign) {
                        PRINT(&sign, 1);
                } else if (flags & HEXPREFIX) {
                        ox[0] = '0';
                        ox[1] = ch;
                        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 */
                        if (ch >= 'f') {        /* 'f' or 'g' */
                                if (_double == 0) {
                                        /* kludge for __dtoa irregularity */
                                        PRINT("0", 1);
                                        if (expt < ndig || (flags & ALT) != 0) {
                                                PRINT(decimal_point, 1);
                                                PAD(ndig - 1, zeroes);
                                        }
                                } else if (expt <= 0) {
                                        PRINT("0", 1);
                                        PRINT(decimal_point, 1);
                                        PAD(-expt, zeroes);
                                        PRINT(cp, ndig);
                                } else if (expt >= ndig) {
                                        PRINT(cp, ndig);
                                        PAD(expt - ndig, zeroes);
                                        if (flags & ALT)
                                                PRINT(".", 1);
                                } else {
                                        PRINT(cp, expt);
                                        cp += expt;
                                        PRINT(".", 1);
                                        PRINT(cp, ndig - expt);
                                }
                        } else {        /* 'e' or 'E' */
                                if (ndig > 1 || flags & ALT) {
                                        ox[0] = *cp++;
                                        ox[1] = '.';
                                        PRINT(ox, 2);
                                        if (_double || flags & ALT == 0) {
                                                PRINT(cp, ndig - 1);
                                        } else  /* 0.[0..] */
                                                /* __dtoa irregularity */
                                                PAD(ndig - 1, 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 += width > realsz ? width : realsz;
 
                FLUSH();        /* copy out the I/O vectors */
        }
done:
        va_end(ap);
        FLUSH();
        return (ret);
        /* NOTREACHED */
}
 
#ifdef FLOATING_POINT
 
extern char *_dtoa_r _PARAMS((struct _reent *, double, int,
                              int, int *, int *, char **));
 
static char *cvt(data, value, ndigits, flags, sign, decpt, ch, length)
struct _reent *data;
double value;
int ndigits, flags, *decpt, ch, *length;
char *sign;
{
        int mode, dsgn;
        char *digits, *bp, *rve;
        union double_union tmp;
 
        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 */
        }
 
        tmp.d = value;
        if (word0(tmp) & Sign_bit) {    /* this will check for < 0 and -0.0 */
                value = -value;
                *sign = '-';
        } else
                *sign = '\000';
        digits = _dtoa_r(data, value, mode, ndigits, decpt, &dsgn, &rve);
        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;
        return (digits);
}
 
static int exponent(p0, exp, fmtch)
char *p0;
int exp, fmtch;
{
        register char *p, *t;
        char expbuf[MAXEXP];
 
        p = p0;
        *p++ = fmtch;
        if (exp < 0) {
                exp = -exp;
                *p++ = '-';
        } else
                *p++ = '+';
        t = expbuf + MAXEXP;
        if (exp > 9) {
                do {
                        *--t = to_char(exp % 10);
                } while ((exp /= 10) > 9);
                *--t = to_char(exp);
                for (; t < expbuf + MAXEXP; *p++ = *t++) ;
        } else {
                *p++ = '0';
                *p++ = to_char(exp);
        }
        return (p - p0);
}
#endif /* FLOATING_POINT */

Line No.	Rev	Author	Line
1	2	marcus.erl	`/*`
2			`FUNCTION`
3			`<<vprintf>>, <<vfprintf>>, <<vsprintf>>---format argument list`
4
5			`INDEX`
6			`vprintf`
7			`INDEX`
8			`vfprintf`
9			`INDEX`
10			`vsprintf`
11			`INDEX`
12			`vsnprintf`
13
14			`ANSI_SYNOPSIS`
15			`#include <stdio.h>`
16			`#include <stdarg.h>`
17			`int vprintf(const char *<[fmt]>, va_list <[list]>);`
18			`int vfprintf(FILE <[fp]>, const char <[fmt]>, va_list <[list]>);`
19			`int vsprintf(char <[str]>, const char <[fmt]>, va_list <[list]>);`
20			`int vsnprintf(char <[str]>, size_t <[size]>, const char <[fmt]>, va_list <[list]>);`
21
22			`int _vprintf_r(void <[reent]>, const char <[fmt]>,`
23			`va_list <[list]>);`
24			`int _vfprintf_r(void <[reent]>, FILE <[fp]>, const char *<[fmt]>,`
25			`va_list <[list]>);`
26			`int _vsprintf_r(void <[reent]>, char <[str]>, const char *<[fmt]>,`
27			`va_list <[list]>);`
28			`int _vsnprintf_r(void <[reent]>, char <[str]>, size_t <[size]>, const char *<[fmt]>,`
29			`va_list <[list]>);`
30
31			`TRAD_SYNOPSIS`
32			`#include <stdio.h>`
33			`#include <varargs.h>`
34			`int vprintf( <[fmt]>, <[list]>)`
35			`char *<[fmt]>;`
36			`va_list <[list]>;`
37
38			`int vfprintf(<[fp]>, <[fmt]>, <[list]>)`
39			`FILE *<[fp]>;`
40			`char *<[fmt]>;`
41			`va_list <[list]>;`
42
43			`int vsprintf(<[str]>, <[fmt]>, <[list]>)`
44			`char *<[str]>;`
45			`char *<[fmt]>;`
46			`va_list <[list]>;`
47
48			`int vsnprintf(<[str]>, <[size]>, <[fmt]>, <[list]>)`
49			`char *<[str]>;`
50			`size_t <[size]>;`
51			`char *<[fmt]>;`
52			`va_list <[list]>;`
53
54			`int _vprintf_r(<[reent]>, <[fmt]>, <[list]>)`
55			`char *<[reent]>;`
56			`char *<[fmt]>;`
57			`va_list <[list]>;`
58
59			`int _vfprintf_r(<[reent]>, <[fp]>, <[fmt]>, <[list]>)`
60			`char *<[reent]>;`
61			`FILE *<[fp]>;`
62			`char *<[fmt]>;`
63			`va_list <[list]>;`
64
65			`int _vsprintf_r(<[reent]>, <[str]>, <[fmt]>, <[list]>)`
66			`char *<[reent]>;`
67			`char *<[str]>;`
68			`char *<[fmt]>;`
69			`va_list <[list]>;`
70
71			`int _vsnprintf_r(<[reent]>, <[str]>, <[size]>, <[fmt]>, <[list]>)`
72			`char *<[reent]>;`
73			`char *<[str]>;`
74			`size_t <[size]>;`
75			`char *<[fmt]>;`
76			`va_list <[list]>;`
77
78			`DESCRIPTION`
79			`<<vprintf>>, <<vfprintf>>, <<vsprintf>> and <<vsnprintf>> are (respectively)`
80			`variants of <<printf>>, <<fprintf>>, <<sprintf>> and <<snprintf>>. They differ`
81			`only in allowing their caller to pass the variable argument list as a`
82			`<<va_list>> object (initialized by <<va_start>>) rather than directly`
83			`accepting a variable number of arguments.`
84
85			`RETURNS`
86			`The return values are consistent with the corresponding functions:`
87			`<<vsprintf>> returns the number of bytes in the output string,`
88			`save that the concluding <<NULL>> is not counted.`
89			`<<vprintf>> and <<vfprintf>> return the number of characters transmitted.`
90			`If an error occurs, <<vprintf>> and <<vfprintf>> return <<EOF>>. No`
91			`error returns occur for <<vsprintf>>.`
92
93			`PORTABILITY`
94			`ANSI C requires all three functions.`
95
96			`Supporting OS subroutines required: <<close>>, <<fstat>>, <<isatty>>,`
97			`<<lseek>>, <<read>>, <<sbrk>>, <<write>>.`
98			`*/`
99
100			`/*-`
101			`* Copyright (c) 1990 The Regents of the University of California.`
102			`* All rights reserved.`
103			`*`
104			`* This code is derived from software contributed to Berkeley by`
105			`* Chris Torek.`
106			`*`
107			`* Redistribution and use in source and binary forms, with or without`
108			`* modification, are permitted provided that the following conditions`
109			`* are met:`
110			`* 1. Redistributions of source code must retain the above copyright`
111			`* notice, this list of conditions and the following disclaimer.`
112			`* 2. Redistributions in binary form must reproduce the above copyright`
113			`* notice, this list of conditions and the following disclaimer in the`
114			`* documentation and/or other materials provided with the distribution.`
115			`* 3. All advertising materials mentioning features or use of this software`
116			`* must display the following acknowledgement:`
117			`* This product includes software developed by the University of`
118			`* California, Berkeley and its contributors.`
119			`* 4. Neither the name of the University nor the names of its contributors`
120			`* may be used to endorse or promote products derived from this software`
121			`* without specific prior written permission.`
122			`*`
123			* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
124			`* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE`
125			`* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE`
126			`* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE`
127			`* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL`
128			`* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS`
129			`* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)`
130			`* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT`
131			`* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY`
132			`* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF`
133			`* SUCH DAMAGE.`
134			`*/`
135
136			`#define INTEGER_ONLY`
137			`#define _HAVE_STDC_`
138			`#define _NOLONGLONG`
139			`#define u_long unsigned long`
140			`#define u_short unsigned short`
141			`#define u_int unsigned int`
142			`#define _uquad_t u_long`
143			`#define _POINTER_INT int`
144			`#define _CONST const`
145			`#define NULL 0`
146
147			`#include "common.h"`
148			`#include "support.h"`
149
150			`#if defined(LIBC_SCCS) && !defined(lint)`
151			`/static char sccsid = "from: @(#)vfprintf.c 5.50 (Berkeley) 12/16/92";*/`
152			`static char *rcsid = "$Id: cprintf.c,v 1.2 2002-04-19 11:08:25 markom Exp $";`
153			`#endif /* LIBC_SCCS and not lint */`
154
155			`/*`
156			`* Actual printf innards.`
157			`*`
158			`* This code is large and complicated...`
159			`*/`
160
161			`#ifdef INTEGER_ONLY`
162			`#define VFPRINTF vfiprintf`
163			`#define _VFPRINTF_R _vfiprintf_r`
164			`#else`
165			`#define VFPRINTF vfprintf`
166			`#define _VFPRINTF_R _vfprintf_r`
167			`#define FLOATING_POINT`
168			`#endif`
169
170			`#define _NO_LONGLONG`
171			`#if defined WANT_PRINTF_LONG_LONG && defined __GNUC__`
172			`# undef _NO_LONGLONG`
173			`#endif`
174
175			`#include <stdarg.h>`
176
177			`#ifdef FLOATING_POINT`
178	355	julius	`//#include <locale.h>`
179			`//#include <math.h>`
180			`//#include "floatio.h"`
181	2	marcus.erl
182			`#define BUF (MAXEXP+MAXFRACT+1) /* + decimal point */`
183			`#define DEFPREC 6`
184
185	406	julius	`static char *cvt`
186			`_PARAMS((struct _reent , double, int, int, char , int , int, int ));`
187	2	marcus.erl	`static int exponent _PARAMS((char *, int, int));`
188
189			`#else /* no FLOATING_POINT */`
190
191			`#define BUF 40`
192
193			`#endif /* FLOATING_POINT */`
194
195			`/*`
196			`* Macros for converting digits to letters and vice versa`
197			`*/`
198			`#define to_digit(c) ((c) - '0')`
199			`#define is_digit(c) ((unsigned)to_digit(c) <= 9)`
200			`#define to_char(n) ((n) + '0')`
201
202			`/*`
203			`* Flags used during conversion.`
204			`*/`
205	406	julius	`#define ALT 0x001 /* alternate form */`
206			`#define HEXPREFIX 0x002 /* add 0x or 0X prefix */`
207			`#define LADJUST 0x004 /* left adjustment */`
208			`#define LONGDBL 0x008 /* long double; unimplemented */`
209			`#define LONGINT 0x010 /* long integer */`
210			`#define QUADINT 0x020 /* quad integer */`
211			`#define SHORTINT 0x040 /* short integer */`
212			`#define ZEROPAD 0x080 /* zero (as opposed to blank) pad */`
213			`#define FPT 0x100 /* Floating point number */`
214	2	marcus.erl
215			`/*`
216			`* Choose PADSIZE to trade efficiency vs. size. If larger printf`
217			`* fields occur frequently, increase PADSIZE and make the initialisers`
218			`* below longer.`
219			`*/`
220			`#define PADSIZE 16 /* pad chunk size */`
221	406	julius	`static _CONST char blanks[PADSIZE] =`
222			`{ ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ',`
223			`' ' };`
224			`static _CONST char zeroes[PADSIZE] =`
225			`{ '0', '0', '0', '0', '0', '0', '0', '0', '0', '0', '0', '0', '0', '0', '0',`
226			`'0' };`
227	2	marcus.erl
228	406	julius	`inline void pc(_CONST char c)`
229			`{`
230	2	marcus.erl	`#ifdef OR1K`
231	406	julius	`putc(c);`
232	2	marcus.erl	`#else`
233	406	julius	`printf("%c", c);`
234	2	marcus.erl	`#endif`
235			`}`
236	406	julius
237	2	marcus.erl	`/*`
238			* BEWARE, these `goto error' on error, and PAD uses `n'.
239			`*/`
240	406	julius	`inline void PRINT(_CONST char *ptr, int len)`
241			`{`
242			`int i;`
243			`for (i = 0; i < len; i++)`
244			`pc(*(ptr++));`
245	2	marcus.erl	`}`
246
247	406	julius	`inline void PAD(int howmany, _CONST char *with)`
248			`{`
249			`int n;`
250	2	marcus.erl	`if ((n = howmany) > 0) {`
251			`while (n > PADSIZE) {`
252			`PRINT(with, PADSIZE);`
253			`n -= PADSIZE;`
254			`}`
255			`PRINT(with, n);`
256			`}`
257			`}`
258
259	406	julius	`int printf(const char *fmt0, ...)`
260			`{`
261	2	marcus.erl	`register char fmt; / format string */`
262			`register int ch; /* character from fmt */`
263	406	julius	`int n; /* handy integers (short term usage) */`
264	2	marcus.erl	`register char cp; / handy char pointer (short term usage) */`
265			`register int flags; /* flags as above */`
266			`int ret; /* return value accumulator */`
267			`int width; /* width from format (%8d), or 0 */`
268			`int prec; /* precision from format (%.3d), or -1 */`
269			`char sign; /* sign prefix (' ', '+', '-', or \0) */`
270			`va_list ap;`
271	406	julius
272	2	marcus.erl	`#ifdef FLOATING_POINT`
273			`char *decimal_point = localeconv()->decimal_point;`
274			`char softsign; /* temporary negative sign for floats */`
275			`/*`
276			`* Although it is natural to declare this double here, the`
277			`* declaration causes gcc to save FP registers even when not`
278			`* printing an FP number. This results in surprising use`
279			`* of FP registers to print integers or strings on at least the`
280			`* PowerPC. A more proper solution would be to move FP printing`
281			`* to another file, but this does seem to work.`
282			`*/`
283			`#if 0`
284			`double _double; /* double precision arguments %[eEfgG] */`
285			`#else`
286	406	julius	`/* double precision arguments %[eEfgG] */`
287			`union {`
288			`int i;`
289			`double d;`
290			`} _double_ = {`
291			`0};`
292	2	marcus.erl	`#define _double (_double_.d)`
293			`#endif`
294			`int expt; /* integer value of exponent */`
295			`int expsize; /* character count for expstr */`
296			`int ndig; /* actual number of digits returned by cvt */`
297			`char expstr[7]; /* buffer for exponent string */`
298			`#endif`
299
300			`#ifndef _NO_LONGLONG`
301			`#define quad_t long long`
302			`#define u_quad_t unsigned long long`
303			`#endif`
304
305			`#ifndef _NO_LONGLONG`
306			`u_quad_t _uquad; /* integer arguments %[diouxX] */`
307			`#else`
308			`u_long _uquad;`
309			`#endif`
310	406	julius	`enum { OCT, DEC, HEX } base; /* base for [diouxX] conversion */`
311	2	marcus.erl	`int dprec; /* a copy of prec if [diouxX], 0 otherwise */`
312			`int realsz; /* field size expanded by dprec */`
313			`int size; /* size of converted field or string */`
314	406	julius	`char xdigs = (char )0; /* digits for [xX] conversion */`
315	2	marcus.erl	`#define NIOV 8`
316
317	406	julius	`char buf[BUF]; /* space for %c, %[diouxX], %[eEfgG] */`
318			`char ox[2]; /* space for 0x hex-prefix */`
319	2	marcus.erl
320			`#define FLUSH()`
321
322			`/*`
323			`* To extend shorts properly, we need both signed and unsigned`
324			`* argument extraction methods.`
325			`*/`
326			`#ifndef _NO_LONGLONG`
327			`#define SARG() \`
328			`(flags&QUADINT ? va_arg(ap, quad_t) : \`
329			`flags&LONGINT ? va_arg(ap, long) : \`
330			`flags&SHORTINT ? (long)(short)va_arg(ap, int) : \`
331			`(long)va_arg(ap, int))`
332			`#define UARG() \`
333			`(flags&QUADINT ? va_arg(ap, u_quad_t) : \`
334			`flags&LONGINT ? va_arg(ap, u_long) : \`
335			`flags&SHORTINT ? (u_long)(u_short)va_arg(ap, int) : \`
336			`(u_long)va_arg(ap, u_int))`
337			`#else`
338			`#define SARG() \`
339			`(flags&LONGINT ? va_arg(ap, long) : \`
340			`flags&SHORTINT ? (long)(short)va_arg(ap, int) : \`
341			`(long)va_arg(ap, int))`
342			`#define UARG() \`
343			`(flags&LONGINT ? va_arg(ap, u_long) : \`
344			`flags&SHORTINT ? (u_long)(u_short)va_arg(ap, int) : \`
345			`(u_long)va_arg(ap, u_int))`
346			`#endif`
347
348	406	julius	`va_start(ap, fmt0);`
349	2	marcus.erl	`fmt = (char *)fmt0;`
350			`ret = 0;`
351
352			`/*`
353			* Scan the format for conversions (`%' character).
354			`*/`
355			`for (;;) {`
356	406	julius
357			`while (fmt != 0 && fmt != '%') {`
358			`pc(*fmt);`
359			`fmt++;`
360			`ret++;`
361			`}`
362	2	marcus.erl	`if (!*fmt)`
363	406	julius	`goto done;`
364	2	marcus.erl
365	406	julius	`fmt++; /* Skip % */`
366	2	marcus.erl	`flags = 0;`
367			`dprec = 0;`
368			`width = 0;`
369			`prec = -1;`
370			`sign = '\0';`
371
372			`rflag: ch = *fmt++;`
373			`reswitch: switch (ch) {`
374			`case ' ':`
375			`/*`
376			* ``If the space and + flags both appear, the space
377			`* flag will be ignored.''`
378	406	julius	`* -- ANSI X3J11`
379	2	marcus.erl	`*/`
380			`if (!sign)`
381			`sign = ' ';`
382			`goto rflag;`
383			`case '#':`
384			`flags \|= ALT;`
385			`goto rflag;`
386			`case '*':`
387			`/*`
388			* ``A negative field width argument is taken as a
389			`* - flag followed by a positive field width.''`
390	406	julius	`* -- ANSI X3J11`
391	2	marcus.erl	`* They don't exclude field widths read from args.`
392			`*/`
393			`if ((width = va_arg(ap, int)) >= 0)`
394	406	julius	`goto rflag;`
395	2	marcus.erl	`width = -width;`
396			`/* FALLTHROUGH */`
397			`case '-':`
398			`flags \|= LADJUST;`
399			`goto rflag;`
400			`case '+':`
401			`sign = '+';`
402			`goto rflag;`
403			`case '.':`
404			`if ((ch = fmt++) == '') {`
405			`n = va_arg(ap, int);`
406			`prec = n < 0 ? -1 : n;`
407			`goto rflag;`
408			`}`
409			`n = 0;`
410			`while (is_digit(ch)) {`
411			`n = 10 * n + to_digit(ch);`
412			`ch = *fmt++;`
413			`}`
414			`prec = n < 0 ? -1 : n;`
415			`goto reswitch;`
416			`case '0':`
417			`/*`
418			* ``Note that 0 is taken as a flag, not as the
419			`* beginning of a field width.''`
420	406	julius	`* -- ANSI X3J11`
421	2	marcus.erl	`*/`
422			`flags \|= ZEROPAD;`
423			`goto rflag;`
424	406	julius	`case '1':`
425			`case '2':`
426			`case '3':`
427			`case '4':`
428			`case '5':`
429			`case '6':`
430			`case '7':`
431			`case '8':`
432			`case '9':`
433	2	marcus.erl	`n = 0;`
434			`do {`
435			`n = 10 * n + to_digit(ch);`
436			`ch = *fmt++;`
437			`} while (is_digit(ch));`
438			`width = n;`
439			`goto reswitch;`
440			`#ifdef FLOATING_POINT`
441			`case 'L':`
442			`flags \|= LONGDBL;`
443			`goto rflag;`
444			`#endif`
445			`case 'h':`
446			`flags \|= SHORTINT;`
447			`goto rflag;`
448			`case 'l':`
449			`if (*fmt == 'l') {`
450			`fmt++;`
451			`flags \|= QUADINT;`
452			`} else {`
453			`flags \|= LONGINT;`
454			`}`
455			`goto rflag;`
456			`case 'q':`
457			`flags \|= QUADINT;`
458			`goto rflag;`
459			`case 'c':`
460			`*(cp = buf) = va_arg(ap, int);`
461			`size = 1;`
462			`sign = '\0';`
463			`break;`
464			`case 'D':`
465			`flags \|= LONGINT;`
466	406	julius	`/FALLTHROUGH/ case 'd':`
467	2	marcus.erl	`case 'i':`
468			`_uquad = SARG();`
469			`#ifndef _NO_LONGLONG`
470	406	julius	`if ((quad_t) _uquad < 0)`
471	2	marcus.erl	`#else`
472	406	julius	`if ((long)_uquad < 0)`
473	2	marcus.erl	`#endif`
474			`{`
475
476			`_uquad = -_uquad;`
477			`sign = '-';`
478			`}`
479			`base = DEC;`
480			`goto number;`
481			`#ifdef FLOATING_POINT`
482			`case 'e':`
483			`case 'E':`
484			`case 'f':`
485			`case 'g':`
486			`case 'G':`
487			`if (prec == -1) {`
488			`prec = DEFPREC;`
489			`} else if ((ch == 'g' \|\| ch == 'G') && prec == 0) {`
490			`prec = 1;`
491			`}`
492
493			`if (flags & LONGDBL) {`
494	406	julius	`_double = (double)va_arg(ap, long double);`
495	2	marcus.erl	`} else {`
496			`_double = va_arg(ap, double);`
497			`}`
498
499			`/* do this before tricky precision changes */`
500			`if (isinf(_double)) {`

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