vfprintf.c

cygwin, 著名的在win32下模拟unix操作系统的东东

/*
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 vasprintf(char **<[strp]>, 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 _vasprintf_r(void *<[reent]>, char **<[str]>, 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 vasprintf(<[strp]>, <[fmt]>, <[list]>)
	char **<[strp]>;
	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 _vasprintf_r(<[reent]>, <[strp]>, <[fmt]>, <[list]>)
	char *<[reent]>;
	char **<[strp]>;
	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>>, <<vasprintf>>, <<vsprintf>> and <<vsnprintf>> are 
(respectively) variants of <<printf>>, <<fprintf>>, <<saprintf>>, <<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:
<<vasprintf>>/<<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>> and
<<vasprintf>> returns -1.  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 1.43 2002/08/13 02:40:06 fitzsim 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
#ifndef NO_FLOATING_POINT
#define FLOATING_POINT
#endif
#endif

#define _NO_LONGLONG
#if defined WANT_PRINTF_LONG_LONG && defined __GNUC__
# undef _NO_LONGLONG
#endif

#define _NO_POS_ARGS 
#if defined WANT_IO_POS_ARGS
# undef _NO_POS_ARGS
#endif

#include <_ansi.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <reent.h>
#include <wchar.h>
#include <string.h>

#ifdef _HAVE_STDC
#include <stdarg.h>
#else
#include <varargs.h>
#endif

#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_DBL && (LDBL_MANT_DIG > DBL_MANT_DIG)
#undef _NO_LONGDBL
#endif

/*
 * 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

#ifdef _NO_LONGDBL
static char *cvt _PARAMS((struct _reent *, double, int, int, char *, int *, int, int *));
#else
static char *cvt _PARAMS((struct _reent *, _LONG_DOUBLE, int, int, char *, int *, int, int *));
extern int  _ldcheck _PARAMS((_LONG_DOUBLE *));
#endif

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

#else /* no FLOATING_POINT */

#define	BUF		40

#endif /* FLOATING_POINT */

#ifndef _NO_LONG_LONG
#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 void *   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
#define MAX_POS_ARGS 32

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;
};

static union arg_val *get_arg (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 */

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

int 
_DEFUN (VFPRINTF, (fp, fmt0, ap),
	FILE * fp _AND
	_CONST char *fmt0 _AND
	va_list ap)
{
  int result;
  _flockfile(fp);
  CHECK_INIT (fp);
  result = _VFPRINTF_R (fp->_data, fp, fmt0, ap);
  _funlockfile(fp);
  return result;
}

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 */
	int N;                  /* arg number */
	int arg_index;          /* index into args processed directly */
#ifndef _NO_POS_ARGS
	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) */
	wchar_t wc;
#ifdef FLOATING_POINT
	char *decimal_point = localeconv()->decimal_point;
	char softsign;		/* temporary negative sign for floats */
#ifdef _NO_LONGDBL
	union { int i; double d; } _double_ = {0};
	#define _fpvalue (_double_.d)
#else
	union { int i; _LONG_DOUBLE ld; } _long_double_ = {0};
	#define _fpvalue (_long_double_.ld)
	int tmp;  
#endif
	int expt;		/* integer value of exponent */
	int expsize = 0;	/* character count for expstr */
	int ndig;		/* actual number of digits returned by cvt */
	char expstr[7];		/* buffer for exponent string */
#endif


	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, %[diouxX], %[eEfgG] */
	char ox[2];		/* space for 0x hex-prefix */
        mbstate_t state;          /* 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'};

        memset (&state, '\0', sizeof (state));
	/*
	 * 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; \
}

	/* 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 (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) : \
	    (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) : \
	    (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) : \
	    (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) : \
	    (u_long)GET_ARG(N, ap, u_int))
#endif

	/* 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;
	arg_index = 0;
#ifndef _NO_POS_ARGS
	saved_fmt = NULL;