📄 vfnprintf.cxx
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//===========================================================================
//
// vfnprintf.c
//
// I/O routines for vfnprintf() for use with ANSI C library
//
//===========================================================================
//####ECOSGPLCOPYRIGHTBEGIN####
// -------------------------------------------
// This file is part of eCos, the Embedded Configurable Operating System.
// Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
//
// eCos is free software; you can redistribute it and/or modify it under
// the terms of the GNU General Public License as published by the Free
// Software Foundation; either version 2 or (at your option) any later version.
//
// eCos is distributed in the hope that it will be useful, but WITHOUT ANY
// WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
// for more details.
//
// You should have received a copy of the GNU General Public License along
// with eCos; if not, write to the Free Software Foundation, Inc.,
// 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
//
// As a special exception, if other files instantiate templates or use macros
// or inline functions from this file, or you compile this file and link it
// with other works to produce a work based on this file, this file does not
// by itself cause the resulting work to be covered by the GNU General Public
// License. However the source code for this file must still be made available
// in accordance with section (3) of the GNU General Public License.
//
// This exception does not invalidate any other reasons why a work based on
// this file might be covered by the GNU General Public License.
//
// Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
// at http://sources.redhat.com/ecos/ecos-license/
// -------------------------------------------
//####ECOSGPLCOPYRIGHTEND####
//===========================================================================
//#####DESCRIPTIONBEGIN####
//
// Author(s): jlarmour
// Contributors:
// Date: 2000-04-20
// Purpose:
// Description:
// Usage:
//
//####DESCRIPTIONEND####
//
//===========================================================================
//
// This code is based on original code with the following copyright:
//
/*-
* 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. 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.
*/
// CONFIGURATION
#include <pkgconf/libc_stdio.h> // Configuration header
#include <pkgconf/libc_i18n.h> // Configuration header for mb support
// INCLUDES
#include <cyg/infra/cyg_type.h> // Common type definitions and support
#include <stdarg.h> // Variable argument definitions
#include <stdio.h> // Standard header for all stdio files
#include <string.h> // memchr() and strlen() functions
#include <cyg/libc/stdio/stream.hxx> // C library streams
#ifdef CYGSEM_LIBC_STDIO_PRINTF_FLOATING_POINT
# include <float.h> // for DBL_DIG etc. below
# include <math.h> // for modf()
# include <sys/ieeefp.h> // Cyg_libm_ieee_double_shape_type
# define MAXFRACT DBL_DIG
# define MAXEXP DBL_MAX_10_EXP
# define BUF (MAXEXP+MAXFRACT+1) /* + decimal point */
# define DEFPREC 6
static int
cvt( double, int, int, char *, int, char *, char * );
#else // ifdef CYGSEM_LIBC_STDIO_PRINTF_FLOATING_POINT
# define BUF 40
#endif // ifdef CYGSEM_LIBC_STDIO_PRINTF_FLOATING_POINT
/*
* Actual printf innards.
*
* This code is large and complicated...
*/
#ifdef CYGINT_LIBC_I18N_MB_REQUIRED
typedef int (*mbtowc_fn_type)(wchar_t *, const char *, size_t, int *);
externC mbtowc_fn_type __get_current_locale_mbtowc_fn();
#endif
/*
* 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 */
#define SIZET 0x200 /* size_t */
externC int
vfnprintf ( FILE *stream, size_t n, const char *format, va_list arg) __THROW
{
char *fmt; /* format string */
int ch; /* character from fmt */
int x, y; /* handy integers (short term usage) */
char *cp; /* handy char pointer (short term usage) */
int flags; /* flags as above */
#ifdef CYGINT_LIBC_I18N_MB_REQUIRED
int state = 0; /* state for mbtowc conversion */
mbtowc_fn_type mbtowc_fn;
#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;
#define quad_t long long
#define u_quad_t unsigned long long
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 fieldsz; /* field size expanded by sign, etc */
int realsz; /* field size expanded by dprec */
int size; /* size of converted field or string */
char *xdigs; /* digits for [xX] conversion */
#define NIOV 8
char buf[BUF]; /* space for %c, %[diouxX], %[eEfgG] */
char ox[2]; /* space for 0x hex-prefix */
#ifdef CYGSEM_LIBC_STDIO_PRINTF_FLOATING_POINT
char softsign; /* temporary negative sign for floats */
double _double; /* double precision arguments %[eEfgG] */
int fpprec; /* `extra' floating precision in [eEfgG] */
#endif
/*
* 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 char blanks[PADSIZE] =
{' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' '};
static char zeroes[PADSIZE] =
{'0','0','0','0','0','0','0','0','0','0','0','0','0','0','0','0'};
#define MIN(a, b) ((a) < (b) ? (a) : (b))
/*
* BEWARE, these `goto error' on error, and PAD uses `n'.
*/
#define PRINT(ptr, len) \CYG_MACRO_START \ cyg_ucount32 length = MIN( (cyg_ucount32) len, n - ret - 1); \ if (((Cyg_StdioStream *)stream)->write( (const cyg_uint8 *)ptr, \ length, &length )) \ goto error; \ if (length < (cyg_ucount32)len) { \ ret += length; \ goto done; \ } \CYG_MACRO_END
#define PAD(howmany, with) \CYG_MACRO_START \ if ((x = (howmany)) > 0) { \ while (x > PADSIZE) { \ PRINT(with, PADSIZE); \ x -= PADSIZE; \ } \ PRINT(with, x); \ } \CYG_MACRO_END
/*
* To extend shorts properly, we need both signed and unsigned
* argument extraction methods.
*/
#define SARG() \ (flags&QUADINT ? va_arg(arg, cyg_int64) : \ flags&LONGINT ? va_arg(arg, long) : \ flags&SHORTINT ? (long)(short)va_arg(arg, int) : \ flags&SIZET ? (long)va_arg(arg, size_t) : \ (long)va_arg(arg, int))
#define UARG() \ (flags&QUADINT ? va_arg(arg, cyg_uint64) : \ flags&LONGINT ? va_arg(arg, unsigned long) : \ flags&SHORTINT ? (unsigned long)(unsigned short)va_arg(arg, int) : \ flags&SIZET ? va_arg(arg, size_t) : \ (unsigned long)va_arg(arg, unsigned int))
xdigs = NULL; // stop compiler whinging
fmt = (char *)format;
ret = 0;
#ifdef CYGINT_LIBC_I18N_MB_REQUIRED
mbtowc_fn = __get_current_locale_mbtowc_fn();
#endif
/*
* Scan the format for conversions (`%' character).
*/
for (;;) {
cp = (char *)fmt;
#ifndef CYGINT_LIBC_I18N_MB_REQUIRED
while ((x = ((wc = *fmt) != 0))) {
#else
while ((x = mbtowc_fn (&wc, fmt, MB_CUR_MAX, &state)) > 0) {
#endif
fmt += x;
if (wc == '%') {
fmt--;
break;
}
}
if ((y = fmt - cp) != 0) {
PRINT(cp, y);
ret += y;
}
if ((x <= 0) || (ret >= (int)n)) // @@@ this check with n isn't good enough
goto done;
fmt++; /* skip over '%' */
flags = 0;
dprec = 0;
#ifdef CYGSEM_LIBC_STDIO_PRINTF_FLOATING_POINT
fpprec = 0;
#endif
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(arg, int)) >= 0)
goto rflag;
width = -width;
/* FALLTHROUGH */
case '-':
flags |= LADJUST;
goto rflag;
case '+':
sign = '+';
goto rflag;
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