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Diffstat (limited to 'winsup/mingw/mingwex/stdio/pformat.c')
| -rw-r--r-- | winsup/mingw/mingwex/stdio/pformat.c | 2537 |
1 files changed, 0 insertions, 2537 deletions
diff --git a/winsup/mingw/mingwex/stdio/pformat.c b/winsup/mingw/mingwex/stdio/pformat.c deleted file mode 100644 index 55972fc45..000000000 --- a/winsup/mingw/mingwex/stdio/pformat.c +++ /dev/null @@ -1,2537 +0,0 @@ -/* FIXME: to be removed one day; for now we explicitly are not - * prepared to support the POSIX-XSI additions to the C99 standard. - */ -#undef WITH_XSI_FEATURES - -/* pformat.c - * - * $Id$ - * - * Provides a core implementation of the formatting capabilities - * common to the entire `printf()' family of functions; it conforms - * generally to C99 and SUSv3/POSIX specifications, with extensions - * to support Microsoft's non-standard format specifications. - * - * Written by Keith Marshall <keithmarshall@users.sourceforge.net> - * - * This is free software. You may redistribute and/or modify it as you - * see fit, without restriction of copyright. - * - * This software is provided "as is", in the hope that it may be useful, - * but WITHOUT WARRANTY OF ANY KIND, not even any implied warranty of - * MERCHANTABILITY, nor of FITNESS FOR ANY PARTICULAR PURPOSE. At no - * time will the author accept any form of liability for any damages, - * however caused, resulting from the use of this software. - * - * The elements of this implementation which deal with the formatting - * of floating point numbers, (i.e. the `%e', `%E', `%f', `%F', `%g' - * and `%G' format specifiers, but excluding the hexadecimal floating - * point `%a' and `%A' specifiers), make use of the `__gdtoa' function - * written by David M. Gay, and are modelled on his sample code, which - * has been deployed under its accompanying terms of use:-- - * - ****************************************************************** - * Copyright (C) 1997, 1999, 2001 Lucent Technologies - * All Rights Reserved - * - * Permission to use, copy, modify, and distribute this software and - * its documentation for any purpose and without fee is hereby - * granted, provided that the above copyright notice appear in all - * copies and that both that the copyright notice and this - * permission notice and warranty disclaimer appear in supporting - * documentation, and that the name of Lucent or any of its entities - * not be used in advertising or publicity pertaining to - * distribution of the software without specific, written prior - * permission. - * - * LUCENT DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, - * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. - * IN NO EVENT SHALL LUCENT OR ANY OF ITS ENTITIES BE LIABLE FOR ANY - * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES - * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER - * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, - * ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF - * THIS SOFTWARE. - ****************************************************************** - * - */ -#include <stdio.h> -#include <stdarg.h> -#include <stddef.h> -#include <stdint.h> -#include <stdlib.h> -#include <string.h> -#include <limits.h> -#include <locale.h> -#include <wchar.h> -#include <math.h> - -/* FIXME: The following belongs in values.h, but current MinGW - * has nothing useful there! OTOH, values.h is not a standard - * header, and it's use may be considered obsolete; perhaps it - * is better to just keep these definitions here. - */ -#ifndef _VALUES_H -/* - * values.h - * - */ -#define _VALUES_H - -#include <limits.h> - -#define _TYPEBITS(type) (sizeof(type) * CHAR_BIT) - -#define LLONGBITS _TYPEBITS(long long) - -#endif /* !defined _VALUES_H -- end of file */ - -#include "pformat.h" - -/* Bit-map constants, defining the internal format control - * states, which propagate through the flags. - */ -#define PFORMAT_HASHED 0x0800 -#define PFORMAT_LJUSTIFY 0x0400 -#define PFORMAT_ZEROFILL 0x0200 - -#define PFORMAT_JUSTIFY (PFORMAT_LJUSTIFY | PFORMAT_ZEROFILL) -#define PFORMAT_IGNORE -1 - -#define PFORMAT_SIGNED 0x01C0 -#define PFORMAT_POSITIVE 0x0100 -#define PFORMAT_NEGATIVE 0x0080 -#define PFORMAT_ADDSPACE 0x0040 - -#define PFORMAT_XCASE 0x0020 - -#define PFORMAT_LDOUBLE 0x0004 - -/* `%o' format digit extraction mask, and shift count... - * (These are constant, and do not propagate through the flags). - */ -#define PFORMAT_OMASK 0x0007 -#define PFORMAT_OSHIFT 0x0003 - -/* `%x' and `%X' format digit extraction mask, and shift count... - * (These are constant, and do not propagate through the flags). - */ -#define PFORMAT_XMASK 0x000F -#define PFORMAT_XSHIFT 0x0004 - -/* The radix point character, used in floating point formats, is - * localised on the basis of the active LC_NUMERIC locale category. - * It is stored locally, as a `wchar_t' entity, which is converted - * to a (possibly multibyte) character on output. Initialisation - * of the stored `wchar_t' entity, together with a record of its - * effective multibyte character length, is required each time - * `__pformat()' is entered, (static storage would not be thread - * safe), but this initialisation is deferred until it is actually - * needed; on entry, the effective character length is first set to - * the following value, (and the `wchar_t' entity is zeroed), to - * indicate that a call of `localeconv()' is needed, to complete - * the initialisation. - */ -#define PFORMAT_RPINIT -3 - -/* The floating point format handlers return the following value - * for the radix point position index, when the argument value is - * infinite, or not a number. - */ -#define PFORMAT_INFNAN -32768 - -#ifdef _WIN32 -/* - * The Microsoft standard for printing `%e' format exponents is - * with a minimum of three digits, unless explicitly set otherwise, - * by a prior invocation of the `_set_output_format()' function. - * - * The following macro allows us to replicate this behaviour. - */ -# define PFORMAT_MINEXP __pformat_exponent_digits() - /* - * However, this feature is unsupported for versions of the - * MSVC runtime library prior to msvcr80.dll, and by default, - * MinGW uses an earlier version, (equivalent to msvcr60.dll), - * for which `_TWO_DIGIT_EXPONENT' will be undefined. - */ -# ifndef _TWO_DIGIT_EXPONENT - /* - * This hack works around the lack of the `_set_output_format()' - * feature, when supporting versions of the MSVC runtime library - * prior to msvcr80.dll; it simply enforces Microsoft's original - * convention, for all cases where the feature is unsupported. - */ -# define _get_output_format() 0 -# define _TWO_DIGIT_EXPONENT 1 -# endif -/* - * Irrespective of the MSVCRT version supported, *we* will add - * an additional capability, through the following inline function, - * which will allow the user to choose his own preferred default - * for `PRINTF_EXPONENT_DIGITS', through the simple expedient - * of defining it as an environment variable. - */ -static __inline__ __attribute__((__always_inline__)) -int __pformat_exponent_digits( void ) -{ - char *exponent_digits = getenv( "PRINTF_EXPONENT_DIGITS" ); - return ((exponent_digits != NULL) && ((unsigned)(*exponent_digits - '0') < 3)) - || (_get_output_format() & _TWO_DIGIT_EXPONENT) - ? 2 - : 3 - ; -} -#else -/* - * When we don't care to mimic Microsoft's standard behaviour, - * we adopt the C99/POSIX standard of two digit exponents. - */ -# define PFORMAT_MINEXP 2 -#endif - -typedef union -{ - /* A data type agnostic representation, - * for printf arguments of any integral data type... - */ - signed long __pformat_long_t; - signed long long __pformat_llong_t; - unsigned long __pformat_ulong_t; - unsigned long long __pformat_ullong_t; - unsigned short __pformat_ushort_t; - unsigned char __pformat_uchar_t; - signed short __pformat_short_t; - signed char __pformat_char_t; - void * __pformat_ptr_t; -} __pformat_intarg_t; - -typedef enum -{ - /* Format interpreter state indices... - * (used to identify the active phase of format string parsing). - */ - PFORMAT_INIT = 0, - PFORMAT_SET_WIDTH, - PFORMAT_GET_PRECISION, - PFORMAT_SET_PRECISION, - PFORMAT_END -} __pformat_state_t; - -typedef enum -{ - /* Argument length classification indices... - * (used for arguments representing integer data types). - */ - PFORMAT_LENGTH_INT = 0, - PFORMAT_LENGTH_SHORT, - PFORMAT_LENGTH_LONG, - PFORMAT_LENGTH_LLONG, - PFORMAT_LENGTH_CHAR -} __pformat_length_t; -/* - * And a macro to map any arbitrary data type to an appropriate - * matching index, selected from those above; the compiler should - * collapse this to a simple assignment. - */ -#define __pformat_arg_length( type ) \ - sizeof( type ) == sizeof( long long ) ? PFORMAT_LENGTH_LLONG : \ - sizeof( type ) == sizeof( long ) ? PFORMAT_LENGTH_LONG : \ - sizeof( type ) == sizeof( short ) ? PFORMAT_LENGTH_SHORT : \ - sizeof( type ) == sizeof( char ) ? PFORMAT_LENGTH_CHAR : \ - /* should never need this default */ PFORMAT_LENGTH_INT - -typedef struct -{ - /* Formatting and output control data... - * An instance of this control block is created, (on the stack), - * for each call to `__pformat()', and is passed by reference to - * each of the output handlers, as required. - */ - void * dest; - int flags; - int width; - int precision; - int rplen; - wchar_t rpchr; - int count; - int quota; - int expmin; -} __pformat_t; - -static -void __pformat_putc( int c, __pformat_t *stream ) -{ - /* Place a single character into the `__pformat()' output queue, - * provided any specified output quota has not been exceeded. - */ - if( (stream->flags & PFORMAT_NOLIMIT) || (stream->quota > stream->count) ) - { - /* Either there was no quota specified, - * or the active quota has not yet been reached. - */ - if( stream->flags & PFORMAT_TO_FILE ) - /* - * This is single character output to a FILE stream... - */ - fputc( c, (FILE *)(stream->dest) ); - - else - /* Whereas, this is to an internal memory buffer... - */ - ((char *)(stream->dest))[stream->count] = c; - } - ++stream->count; -} - -static -void __pformat_putchars( const char *s, int count, __pformat_t *stream ) -{ - /* Handler for `%c' and (indirectly) `%s' conversion specifications. - * - * Transfer characters from the string buffer at `s', character by - * character, up to the number of characters specified by `count', or - * if `precision' has been explicitly set to a value less than `count', - * stopping after the number of characters specified for `precision', - * to the `__pformat()' output stream. - * - * Characters to be emitted are passed through `__pformat_putc()', to - * ensure that any specified output quota is honoured. - */ - if( (stream->precision >= 0) && (count > stream->precision) ) - /* - * Ensure that the maximum number of characters transferred doesn't - * exceed any explicitly set `precision' specification. - */ - count = stream->precision; - - /* Establish the width of any field padding required... - */ - if( stream->width > count ) - /* - * as the number of spaces equivalent to the number of characters - * by which those to be emitted is fewer than the field width... - */ - stream->width -= count; - - else - /* ignoring any width specification which is insufficient. - */ - stream->width = PFORMAT_IGNORE; - - if( (stream->width > 0) && ((stream->flags & PFORMAT_LJUSTIFY) == 0) ) - /* - * When not doing flush left justification, (i.e. the `-' flag - * is not set), any residual unreserved field width must appear - * as blank padding, to the left of the output string. - */ - while( stream->width-- ) - __pformat_putc( '\x20', stream ); - - /* Emit the data... - */ - while( count-- ) - /* - * copying the requisite number of characters from the input. - */ - __pformat_putc( *s++, stream ); - - /* If we still haven't consumed the entire specified field width, - * we must be doing flush left justification; any residual width - * must be filled with blanks, to the right of the output value. - */ - while( stream->width-- > 0 ) - __pformat_putc( '\x20', stream ); -} - -static __inline__ -void __pformat_puts( const char *s, __pformat_t *stream ) -{ - /* Handler for `%s' conversion specifications. - * - * Transfer a NUL terminated character string, character by character, - * stopping when the end of the string is encountered, or if `precision' - * has been explicitly set, when the specified number of characters has - * been emitted, if that is less than the length of the input string, - * to the `__pformat()' output stream. - * - * This is implemented as a trivial call to `__pformat_putchars()', - * passing the length of the input string as the character count, - * (after first verifying that the input pointer is not NULL). - */ - if( s == NULL ) s = "(null)"; - __pformat_putchars( s, strlen( s ), stream ); -} - -static -void __pformat_wputchars( const wchar_t *s, int count, __pformat_t *stream ) -{ - /* Handler for `%C'(`%lc') and `%S'(`%ls') conversion specifications; - * (this is a wide character variant of `__pformat_putchars()'). - * - * Each multibyte character sequence to be emitted is passed, byte - * by byte, through `__pformat_putc()', to ensure that any specified - * output quota is honoured. - */ - char buf[16]; mbstate_t state; int len = wcrtomb( buf, L'\0', &state ); - - if( (stream->precision >= 0) && (count > stream->precision) ) - /* - * Ensure that the maximum number of characters transferred doesn't - * exceed any explicitly set `precision' specification. - */ - count = stream->precision; - - /* Establish the width of any field padding required... - */ - if( stream->width > count ) - /* - * as the number of spaces equivalent to the number of characters - * by which those to be emitted is fewer than the field width... - */ - stream->width -= count; - - else - /* ignoring any width specification which is insufficient. - */ - stream->width = PFORMAT_IGNORE; - - if( (stream->width > 0) && ((stream->flags & PFORMAT_LJUSTIFY) == 0) ) - /* - * When not doing flush left justification, (i.e. the `-' flag - * is not set), any residual unreserved field width must appear - * as blank padding, to the left of the output string. - */ - while( stream->width-- ) - __pformat_putc( '\x20', stream ); - - /* Emit the data, converting each character from the wide - * to the multibyte domain as we go... - */ - while( (count-- > 0) && ((len = wcrtomb( buf, *s++, &state )) > 0) ) - { - char *p = buf; - while( len-- > 0 ) - __pformat_putc( *p++, stream ); - } - - /* If we still haven't consumed the entire specified field width, - * we must be doing flush left justification; any residual width - * must be filled with blanks, to the right of the output value. - */ - while( stream->width-- > 0 ) - __pformat_putc( '\x20', stream ); -} - -static __inline__ __attribute__((__always_inline__)) -void __pformat_wcputs( const wchar_t *s, __pformat_t *stream ) -{ - /* Handler for `%S' (`%ls') conversion specifications. - * - * Transfer a NUL terminated wide character string, character by - * character, converting to its equivalent multibyte representation - * on output, and stopping when the end of the string is encountered, - * or if `precision' has been explicitly set, when the specified number - * of characters has been emitted, if that is less than the length of - * the input string, to the `__pformat()' output stream. - * - * This is implemented as a trivial call to `__pformat_wputchars()', - * passing the length of the input string as the character count, - * (after first verifying that the input pointer is not NULL). - */ - if( s == NULL ) s = L"(null)"; - __pformat_wputchars( s, wcslen( s ), stream ); -} - -static __inline__ -int __pformat_int_bufsiz( int bias, int size, __pformat_t *stream ) -{ - /* Helper to establish the size of the internal buffer, which - * is required to queue the ASCII decomposition of an integral - * data value, prior to transfer to the output stream. - */ - size = ((size - 1 + LLONGBITS) / size) + bias; - size += (stream->precision > 0) ? stream->precision : 0; - return (size > stream->width) ? size : stream->width; -} - -static -void __pformat_int( __pformat_intarg_t value, __pformat_t *stream ) -{ - /* Handler for `%d', `%i' and `%u' conversion specifications. - * - * Transfer the ASCII representation of an integer value parameter, - * formatted as a decimal number, to the `__pformat()' output queue; - * output will be truncated, if any specified quota is exceeded. - */ - char buf[__pformat_int_bufsiz(1, PFORMAT_OSHIFT, stream)]; - char *p = buf; int precision; - - if( stream->flags & PFORMAT_NEGATIVE ) - { - /* The input value might be negative, (i.e. it is a signed value)... - */ - if( value.__pformat_llong_t < 0LL ) - /* - * It IS negative, but we want to encode it as unsigned, - * displayed with a leading minus sign, so convert it... - */ - value.__pformat_llong_t = -value.__pformat_llong_t; - - else - /* It is unequivocally a POSITIVE value, so turn off the - * request to prefix it with a minus sign... - */ - stream->flags &= ~PFORMAT_NEGATIVE; - } - - /* Encode the input value for display... - */ - while( value.__pformat_ullong_t ) - { - /* decomposing it into its constituent decimal digits, - * in order from least significant to most significant, using - * the local buffer as a LIFO queue in which to store them. - */ - *p++ = '0' + (unsigned char)(value.__pformat_ullong_t % 10LL); - value.__pformat_ullong_t /= 10LL; - } - - if( (stream->precision > 0) - && ((precision = stream->precision - (p - buf)) > 0) ) - /* - * We have not yet queued sufficient digits to fill the field width - * specified for minimum `precision'; pad with zeros to achieve this. - */ - while( precision-- > 0 ) - *p++ = '0'; - - if( (p == buf) && (stream->precision != 0) ) - /* - * Input value was zero; make sure we print at least one digit, - * unless the precision is also explicitly zero. - */ - *p++ = '0'; - - if( (stream->width > 0) && ((stream->width -= p - buf) > 0) ) - { - /* We have now queued sufficient characters to display the input value, - * at the desired precision, but this will not fill the output field... - */ - if( stream->flags & PFORMAT_SIGNED ) - /* - * We will fill one additional space with a sign... - */ - stream->width--; - - if( (stream->precision < 0) - && ((stream->flags & PFORMAT_JUSTIFY) == PFORMAT_ZEROFILL) ) - /* - * and the `0' flag is in effect, so we pad the remaining spaces, - * to the left of the displayed value, with zeros. - */ - while( stream->width-- > 0 ) - *p++ = '0'; - - else if( (stream->flags & PFORMAT_LJUSTIFY) == 0 ) - /* - * the `0' flag is not in effect, and neither is the `-' flag, - * so we pad to the left of the displayed value with spaces, so that - * the value appears right justified within the output field. - */ - while( stream->width-- > 0 ) - __pformat_putc( '\x20', stream ); - } - - if( stream->flags & PFORMAT_NEGATIVE ) - /* - * A negative value needs a sign... - */ - *p++ = '-'; - - else if( stream->flags & PFORMAT_POSITIVE ) - /* - * A positive value may have an optionally displayed sign... - */ - *p++ = '+'; - - else if( stream->flags & PFORMAT_ADDSPACE ) - /* - * Space was reserved for displaying a sign, but none was emitted... - */ - *p++ = '\x20'; - - while( p > buf ) - /* - * Emit the accumulated constituent digits, - * in order from most significant to least significant... - */ - __pformat_putc( *--p, stream ); - - while( stream->width-- > 0 ) - /* - * The specified output field has not yet been completely filled; - * the `-' flag must be in effect, resulting in a displayed value which - * appears left justified within the output field; we must pad the field - * to the right of the displayed value, by emitting additional spaces, - * until we reach the rightmost field boundary. - */ - __pformat_putc( '\x20', stream ); -} - -static -void __pformat_xint( int fmt, __pformat_intarg_t value, __pformat_t *stream ) -{ - /* Handler for `%o', `%p', `%x' and `%X' conversions. - * - * These can be implemented using a simple `mask and shift' strategy; - * set up the mask and shift values appropriate to the conversion format, - * and allocate a suitably sized local buffer, in which to queue encoded - * digits of the formatted value, in preparation for output. - */ - int width; - int mask = (fmt == 'o') ? PFORMAT_OMASK : PFORMAT_XMASK; - int shift = (fmt == 'o') ? PFORMAT_OSHIFT : PFORMAT_XSHIFT; - char buf[__pformat_int_bufsiz(2, shift, stream)]; - char *p = buf; - - while( value.__pformat_ullong_t ) - { - /* Encode the specified non-zero input value as a sequence of digits, - * in the appropriate `base' encoding and in reverse digit order, each - * encoded in its printable ASCII form, with no leading zeros, using - * the local buffer as a LIFO queue in which to store them. - */ - char *q; - if( (*(q = p++) = '0' + (value.__pformat_ullong_t & mask)) > '9' ) - *q = (*q + 'A' - '9' - 1) | (fmt & PFORMAT_XCASE); - value.__pformat_ullong_t >>= shift; - } - - if( p == buf ) - /* - * Nothing was queued; input value must be zero, which should never be - * emitted in the `alternative' PFORMAT_HASHED style. - */ - stream->flags &= ~PFORMAT_HASHED; - - if( ((width = stream->precision) > 0) && ((width -= p - buf) > 0) ) - /* - * We have not yet queued sufficient digits to fill the field width - * specified for minimum `precision'; pad with zeros to achieve this. - */ - while( width-- > 0 ) - *p++ = '0'; - - else if( (fmt == 'o') && (stream->flags & PFORMAT_HASHED) ) - /* - * The field width specified for minimum `precision' has already - * been filled, but the `alternative' PFORMAT_HASHED style for octal - * output requires at least one initial zero; that will not have - * been queued, so add it now. - */ - *p++ = '0'; - - if( (p == buf) && (stream->precision != 0) ) - /* - * Still nothing queued for output, but the `precision' has not been - * explicitly specified as zero, (which is necessary if no output for - * an input value of zero is desired); queue exactly one zero digit. - */ - *p++ = '0'; - - if( stream->width > (width = p - buf) ) - /* - * Specified field width exceeds the minimum required... - * Adjust so that we retain only the additional padding width. - */ - stream->width -= width; - - else - /* Ignore any width specification which is insufficient. - */ - stream->width = PFORMAT_IGNORE; - - if( ((width = stream->width) > 0) - && (fmt != 'o') && (stream->flags & PFORMAT_HASHED) ) - /* - * For `%#x' or `%#X' formats, (which have the `#' flag set), - * further reduce the padding width to accommodate the radix - * indicating prefix. - */ - width -= 2; - - if( (width > 0) && (stream->precision < 0) - && ((stream->flags & PFORMAT_JUSTIFY) == PFORMAT_ZEROFILL) ) - /* - * When the `0' flag is set, and not overridden by the `-' flag, - * or by a specified precision, add sufficient leading zeros to - * consume the remaining field width. - */ - while( width-- > 0 ) - *p++ = '0'; - - if( (fmt != 'o') && (stream->flags & PFORMAT_HASHED) ) - { - /* For formats other than octal, the PFORMAT_HASHED output style - * requires the addition of a two character radix indicator, as a - * prefix to the actual encoded numeric value. - */ - *p++ = fmt; - *p++ = '0'; - } - - if( (width > 0) && ((stream->flags & PFORMAT_LJUSTIFY) == 0) ) - /* - * When not doing flush left justification, (i.e. the `-' flag - * is not set), any residual unreserved field width must appear - * as blank padding, to the left of the output value. - */ - while( width-- > 0 ) - __pformat_putc( '\x20', stream ); - - while( p > buf ) - /* - * Move the queued output from the local buffer to the ultimate - * destination, in LIFO order. - */ - __pformat_putc( *--p, stream ); - - /* If we still haven't consumed the entire specified field width, - * we must be doing flush left justification; any residual width - * must be filled with blanks, to the right of the output value. - */ - while( width-- > 0 ) - __pformat_putc( '\x20', stream ); -} - -typedef union -{ - /* A multifaceted representation of an IEEE extended precision, - * (80-bit), floating point number, facilitating access to its - * component parts. - */ - double __pformat_fpreg_double_t; - long double __pformat_fpreg_ldouble_t; - struct - { unsigned long long __pformat_fpreg_mantissa; - signed short __pformat_fpreg_exponent; - }; - unsigned short __pformat_fpreg_bitmap[5]; - unsigned long __pformat_fpreg_bits; -} __pformat_fpreg_t; - -#ifdef _WIN32 -/* TODO: make this unconditional in final release... - * (see note at head of associated `#else' block. - */ -#include "gdtoa.h" - -static -char *__pformat_cvt( int mode, __pformat_fpreg_t x, int nd, int *dp, int *sign ) -{ - /* Helper function, derived from David M. Gay's `g_xfmt()', calling - * his `__gdtoa()' function in a manner to provide extended precision - * replacements for `ecvt()' and `fcvt()'. - */ - int k; unsigned int e = 0; char *ep; - static FPI fpi = { 64, 1-16383-64+1, 32766-16383-64+1, FPI_Round_near, 0 }; - - /* Classify the argument into an appropriate `__gdtoa()' category... - */ - if( (k = __fpclassifyl( x.__pformat_fpreg_ldouble_t )) & FP_NAN ) - /* - * identifying infinities or not-a-number... - */ - k = (k & FP_NORMAL) ? STRTOG_Infinite : STRTOG_NaN; - - else if( k & FP_NORMAL ) - { - /* normal and near-zero `denormals'... - */ - if( k & FP_ZERO ) - { - /* with appropriate exponent adjustment for a `denormal'... - */ - k = STRTOG_Denormal; - e = 1 - 0x3FFF - 63; - } - else - { - /* or with `normal' exponent adjustment... - */ - k = STRTOG_Normal; - e = (x.__pformat_fpreg_exponent & 0x7FFF) - 0x3FFF - 63; - } - } - - else - /* or, if none of the above, it's a zero, (positive or negative). - */ - k = STRTOG_Zero; - - /* Check for negative values, always treating NaN as unsigned... - * (return value is zero for positive/unsigned; non-zero for negative). - */ - *sign = (k == STRTOG_NaN) ? 0 : x.__pformat_fpreg_exponent & 0x8000; - - /* Finally, get the raw digit string, and radix point position index. - */ - return __gdtoa( &fpi, e, &x.__pformat_fpreg_bits, &k, mode, nd, dp, &ep ); -} - -static __inline__ __attribute__((__always_inline__)) -char *__pformat_ecvt( long double x, int precision, int *dp, int *sign ) -{ - /* A convenience wrapper for the above... - * it emulates `ecvt()', but takes a `long double' argument. - */ - __pformat_fpreg_t z; z.__pformat_fpreg_ldouble_t = x; - return __pformat_cvt( 2, z, precision, dp, sign ); -} - -static __inline__ __attribute__((__always_inline__)) -char *__pformat_fcvt( long double x, int precision, int *dp, int *sign ) -{ - /* A convenience wrapper for the above... - * it emulates `fcvt()', but takes a `long double' argument. - */ - __pformat_fpreg_t z; z.__pformat_fpreg_ldouble_t = x; - return __pformat_cvt( 3, z, precision, dp, sign ); -} - -/* The following are required, to clean up the `__gdtoa()' memory pool, - * after processing the data returned by the above. - */ -#define __pformat_ecvt_release( value ) __freedtoa( value ) -#define __pformat_fcvt_release( value ) __freedtoa( value ) - -#else -/* - * TODO: remove this before final release; it is included here as a - * convenience for testing, without requiring a working `__gdtoa()'. - */ -static __inline__ -char *__pformat_ecvt( long double x, int precision, int *dp, int *sign ) -{ - /* Define in terms of `ecvt()'... - */ - char *retval = ecvt( (double)(x), precision, dp, sign ); - if( isinf( x ) || isnan( x ) ) - { - /* emulating `__gdtoa()' reporting for infinities and NaN. - */ - *dp = PFORMAT_INFNAN; - if( *retval == '-' ) - { - /* Need to force the `sign' flag, (particularly for NaN). - */ - ++retval; *sign = 1; - } - } - return retval; -} - -static __inline__ -char *__pformat_fcvt( long double x, int precision, int *dp, int *sign ) -{ - /* Define in terms of `fcvt()'... - */ - char *retval = fcvt( (double)(x), precision, dp, sign ); - if( isinf( x ) || isnan( x ) ) - { - /* emulating `__gdtoa()' reporting for infinities and NaN. - */ - *dp = PFORMAT_INFNAN; - if( *retval == '-' ) - { - /* Need to force the `sign' flag, (particularly for NaN). - */ - ++retval; *sign = 1; - } - } - return retval; -} - -/* No memory pool clean up needed, for these emulated cases... - */ -#define __pformat_ecvt_release( value ) /* nothing to be done */ -#define __pformat_fcvt_release( value ) /* nothing to be done */ - -/* TODO: end of conditional to be removed. */ -#endif - -static __inline__ -void __pformat_emit_radix_point( __pformat_t *stream ) -{ - /* Helper to place a localised representation of the radix point - * character at the ultimate destination, when formatting fixed or - * floating point numbers. - */ - if( stream->rplen == PFORMAT_RPINIT ) - { - /* Radix point initialisation not yet completed; - * establish a multibyte to `wchar_t' converter... - */ - int len; wchar_t rpchr; mbstate_t state; - - /* Initialise the conversion state... - */ - memset( &state, 0, sizeof( state ) ); - - /* Fetch and convert the localised radix point representation... - */ - if( (len = mbrtowc( &rpchr, localeconv()->decimal_point, 16, &state )) > 0 ) - /* - * and store it, if valid. - */ - stream->rpchr = rpchr; - - /* In any case, store the reported effective multibyte length, - * (or the error flag), marking initialisation as `done'. - */ - stream->rplen = len; - } - - if( stream->rpchr != (wchar_t)(0) ) - { - /* We have a localised radix point mark; - * establish a converter to make it a multibyte character... - */ - int len; char buf[len = stream->rplen]; mbstate_t state; - - /* Initialise the conversion state... - */ - memset( &state, 0, sizeof( state ) ); - - /* Convert the `wchar_t' representation to multibyte... - */ - if( (len = wcrtomb( buf, stream->rpchr, &state )) > 0 ) - { - /* and copy to the output destination, when valid... - */ - char *p = buf; - while( len-- > 0 ) - __pformat_putc( *p++, stream ); - } - - else - /* otherwise fall back to plain ASCII '.'... - */ - __pformat_putc( '.', stream ); - } - - else - /* No localisation: just use ASCII '.'... - */ - __pformat_putc( '.', stream ); -} - -static __inline__ __attribute__((__always_inline__)) -void __pformat_emit_numeric_value( int c, __pformat_t *stream ) -{ - /* Convenience helper to transfer numeric data from an internal - * formatting buffer to the ultimate destination... - */ - if( c == '.' ) - /* - * converting this internal representation of the the radix - * point to the appropriately localised representation... - */ - __pformat_emit_radix_point( stream ); - - else - /* and passing all other characters through, unmodified. - */ - __pformat_putc( c, stream ); -} - -static -void __pformat_emit_inf_or_nan( int sign, char *value, __pformat_t *stream ) -{ - /* Helper to emit INF or NAN where a floating point value - * resolves to one of these special states. - */ - int i; - char buf[4]; - char *p = buf; - - /* We use the string formatting helper to display INF/NAN, - * but we don't want truncation if the precision set for the - * original floating point output request was insufficient; - * ignore it! - */ - stream->precision = PFORMAT_IGNORE; - - if( sign ) - /* - * Negative infinity: emit the sign... - */ - *p++ = '-'; - - else if( stream->flags & PFORMAT_POSITIVE ) - /* - * Not negative infinity, but '+' flag is in effect; - * thus, we emit a positive sign... - */ - *p++ = '+'; - - else if( stream->flags & PFORMAT_ADDSPACE ) - /* - * No sign required, but space was reserved for it... - */ - *p++ = '\x20'; - - /* Copy the appropriate status indicator, up to a maximum of - * three characters, transforming to the case corresponding to - * the format specification... - */ - for( i = 3; i > 0; --i ) - *p++ = (*value++ & ~PFORMAT_XCASE) | (stream->flags & PFORMAT_XCASE); - - /* and emit the result. - */ - __pformat_putchars( buf, p - buf, stream ); -} - -static -void __pformat_emit_float( int sign, char *value, int len, __pformat_t *stream ) -{ - /* Helper to emit a fixed point representation of numeric data, - * as encoded by a prior call to `ecvt()' or `fcvt()'; (this does - * NOT include the exponent, for floating point format). - */ - if( len > 0 ) - { - /* The magnitude of `x' is greater than or equal to 1.0... - * reserve space in the output field, for the required number of - * decimal digits to be placed before the decimal point... - */ - if( stream->width > len ) - /* - * adjusting as appropriate, when width is sufficient... - */ - stream->width -= len; - - else - /* or simply ignoring the width specification, if not. - */ - stream->width = PFORMAT_IGNORE; - } - - else if( stream->width > 0 ) - /* - * The magnitude of `x' is less than 1.0... - * reserve space for exactly one zero before the decimal point. - */ - stream->width--; - - /* Reserve additional space for the digits which will follow the - * decimal point... - */ - if( (stream->width >= 0) && (stream->width > stream->precision) ) - /* - * adjusting appropriately, when sufficient width remains... - * (note that we must check both of these conditions, because - * precision may be more negative than width, as a result of - * adjustment to provide extra padding when trailing zeros - * are to be discarded from "%g" format conversion with a - * specified field width, but if width itself is negative, - * then there is explicitly to be no padding anyway). - */ - stream->width -= stream->precision; - - else - /* or again, ignoring the width specification, if not. - */ - stream->width = PFORMAT_IGNORE; - - /* Reserve space in the output field, for display of the decimal point, - * unless the precision is explicity zero, with the `#' flag not set. - */ - if( (stream->width > 0) - && ((stream->precision > 0) || (stream->flags & PFORMAT_HASHED)) ) - stream->width--; - - /* Reserve space in the output field, for display of the sign of the - * formatted value, if required; (i.e. if the value is negative, or if - * either the `space' or `+' formatting flags are set). - */ - if( (stream->width > 0) && (sign || (stream->flags & PFORMAT_SIGNED)) ) - stream->width--; - - /* Emit any padding space, as required to correctly right justify - * the output within the alloted field width. - */ - if( (stream->width > 0) && ((stream->flags & PFORMAT_JUSTIFY) == 0) ) - while( stream->width-- > 0 ) - __pformat_putc( '\x20', stream ); - - /* Emit the sign indicator, as appropriate... - */ - if( sign ) - /* - * mandatory, for negative values... - */ - __pformat_putc( '-', stream ); - - else if( stream->flags & PFORMAT_POSITIVE ) - /* - * optional, for positive values... - */ - __pformat_putc( '+', stream ); - - else if( stream->flags & PFORMAT_ADDSPACE ) - /* - * or just fill reserved space, when the space flag is in effect. - */ - __pformat_putc( '\x20', stream ); - - /* If the `0' flag is in effect, and not overridden by the `-' flag, - * then zero padding, to fill out the field, goes here... - */ - if( (stream->width > 0) - && ((stream->flags & PFORMAT_JUSTIFY) == PFORMAT_ZEROFILL) ) - while( stream->width-- > 0 ) - __pformat_putc( '0', stream ); - - /* Emit the digits of the encoded numeric value... - */ - if( len > 0 ) - /* - * ...beginning with those which precede the radix point, - * and appending any necessary significant trailing zeros. - */ - do __pformat_putc( *value ? *value++ : '0', stream ); - while( --len > 0 ); - - else - /* The magnitude of the encoded value is less than 1.0, so no - * digits precede the radix point; we emit a mandatory initial - * zero, followed immediately by the radix point. - */ - __pformat_putc( '0', stream ); - - /* Unless the encoded value is integral, AND the radix point - * is not expressly demanded by the `#' flag, we must insert - * the appropriately localised radix point mark here... - */ - if( (stream->precision > 0) || (stream->flags & PFORMAT_HASHED) ) - __pformat_emit_radix_point( stream ); - - /* When the radix point offset, `len', is negative, this implies - * that additional zeros must appear, following the radix point, - * and preceding the first significant digit... - */ - if( len < 0 ) - { - /* To accommodate these, we adjust the precision, (reducing it - * by adding a negative value), and then we emit as many zeros - * as are required. - */ - stream->precision += len; - do __pformat_putc( '0', stream ); - while( ++len < 0 ); - } - - /* Now we emit any remaining significant digits, or trailing zeros, - * until the required precision has been achieved. - */ - while( stream->precision-- > 0 ) - __pformat_putc( *value ? *value++ : '0', stream ); -} - -static -void __pformat_emit_efloat( int sign, char *value, int e, __pformat_t *stream ) -{ - /* Helper to emit a floating point representation of numeric data, - * as encoded by a prior call to `ecvt()' or `fcvt()'; (this DOES - * include the following exponent). - */ - int exp_width = 1; - __pformat_intarg_t exponent; exponent.__pformat_llong_t = e -= 1; - - /* Determine how many digit positions are required for the exponent. - */ - while( (e /= 10) != 0 ) - exp_width++; - - /* Ensure that this is at least as many as the standard requirement. - */ - if( exp_width < stream->expmin ) - exp_width = stream->expmin; - - /* Adjust the residual field width allocation, to allow for the - * number of exponent digits to be emitted, together with a sign - * and exponent separator... - */ - if( stream->width > (exp_width += 2) ) - stream->width -= exp_width; - - else - /* ignoring the field width specification, if insufficient. - */ - stream->width = PFORMAT_IGNORE; - - /* Emit the significand, as a fixed point value with one digit - * preceding the radix point. - */ - __pformat_emit_float( sign, value, 1, stream ); - - /* Reset precision, to ensure the mandatory minimum number of - * exponent digits will be emitted, and set the flags to ensure - * the sign is displayed. - */ - stream->precision = stream->expmin; - stream->flags |= PFORMAT_SIGNED; - - /* Emit the exponent separator. - */ - __pformat_putc( ('E' | (stream->flags & PFORMAT_XCASE)), stream ); - - /* Readjust the field width setting, such that it again allows - * for the digits of the exponent, (which had been discounted when - * computing any left side padding requirement), so that they are - * correctly included in the computation of any right side padding - * requirement, (but here we exclude the exponent separator, which - * has been emitted, and so counted already). - */ - stream->width += exp_width - 1; - - /* And finally, emit the exponent itself, as a signed integer, - * with any padding required to achieve flush left justification, - * (which will be added automatically, by `__pformat_int()'). - */ - __pformat_int( exponent, stream ); -} - -static -void __pformat_float( long double x, __pformat_t *stream ) -{ - /* Handler for `%f' and `%F' format specifiers. - * - * This wraps calls to `__pformat_cvt()', `__pformat_emit_float()' - * and `__pformat_emit_inf_or_nan()', as appropriate, to achieve - * output in fixed point format. - */ - int sign, intlen; char *value; - - /* Establish the precision for the displayed value, defaulting to six - * digits following the decimal point, if not explicitly specified. - */ - if( stream->precision < 0 ) - stream->precision = 6; - - /* Encode the input value as ASCII, for display... - */ - value = __pformat_fcvt( x, stream->precision, &intlen, &sign ); - - if( intlen == PFORMAT_INFNAN ) - /* - * handle cases of `infinity' or `not-a-number'... - */ - __pformat_emit_inf_or_nan( sign, value, stream ); - - else - { /* or otherwise, emit the formatted result. - */ - __pformat_emit_float( sign, value, intlen, stream ); - - /* and, if there is any residual field width as yet unfilled, - * then we must be doing flush left justification, so pad out to - * the right hand field boundary. - */ - while( stream->width-- > 0 ) - __pformat_putc( '\x20', stream ); - } - - /* Clean up `__pformat_fcvt()' memory allocation for `value'... - */ - __pformat_fcvt_release( value ); -} - -static -void __pformat_efloat( long double x, __pformat_t *stream ) -{ - /* Handler for `%e' and `%E' format specifiers. - * - * This wraps calls to `__pformat_cvt()', `__pformat_emit_efloat()' - * and `__pformat_emit_inf_or_nan()', as appropriate, to achieve - * output in floating point format. - */ - int sign, intlen; char *value; - - /* Establish the precision for the displayed value, defaulting to six - * digits following the decimal point, if not explicitly specified. - */ - if( stream->precision < 0 ) - stream->precision = 6; - - /* Encode the input value as ASCII, for display... - */ - value = __pformat_ecvt( x, stream->precision + 1, &intlen, &sign ); - - if( intlen == PFORMAT_INFNAN ) - /* - * handle cases of `infinity' or `not-a-number'... - */ - __pformat_emit_inf_or_nan( sign, value, stream ); - - else - /* or otherwise, emit the formatted result. - */ - __pformat_emit_efloat( sign, value, intlen, stream ); - - /* Clean up `__pformat_ecvt()' memory allocation for `value'... - */ - __pformat_ecvt_release( value ); -} - -static -void __pformat_gfloat( long double x, __pformat_t *stream ) -{ - /* Handler for `%g' and `%G' format specifiers. - * - * This wraps calls to `__pformat_cvt()', `__pformat_emit_float()', - * `__pformat_emit_efloat()' and `__pformat_emit_inf_or_nan()', as - * appropriate, to achieve output in the more suitable of either - * fixed or floating point format. - */ - int sign, intlen; char *value; - - /* Establish the precision for the displayed value, defaulting to - * six significant digits, if not explicitly specified... - */ - if( stream->precision < 0 ) - stream->precision = 6; - - /* or to a minimum of one digit, otherwise... - */ - else if( stream->precision == 0 ) - stream->precision = 1; - - /* Encode the input value as ASCII, for display. - */ - value = __pformat_ecvt( x, stream->precision, &intlen, &sign ); - - if( intlen == PFORMAT_INFNAN ) - /* - * Handle cases of `infinity' or `not-a-number'. - */ - __pformat_emit_inf_or_nan( sign, value, stream ); - - else if( (-4 < intlen) && (intlen <= stream->precision) ) - { - /* Value lies in the acceptable range for fixed point output, - * (i.e. the exponent is no less than minus four, and the number - * of significant digits which precede the radix point is fewer - * than the least number which would overflow the field width, - * specified or implied by the established precision). - */ - if( (stream->flags & PFORMAT_HASHED) == PFORMAT_HASHED ) - /* - * The `#' flag is in effect... - * Adjust precision to retain the specified number of significant - * digits, with the proper number preceding the radix point, and - * the balance following it... - */ - stream->precision -= intlen; - - else - /* The `#' flag is not in effect... - * Here we adjust the precision to accommodate all digits which - * precede the radix point, but we truncate any balance following - * it, to suppress output of non-significant trailing zeros... - */ - if( ((stream->precision = strlen( value ) - intlen) < 0) - /* - * This may require a compensating adjustment to the field - * width, to accommodate significant trailing zeros, which - * precede the radix point... - */ - && (stream->width > 0) ) - stream->width += stream->precision; - - /* Now, we format the result as any other fixed point value. - */ - __pformat_emit_float( sign, value, intlen, stream ); - - /* If there is any residual field width as yet unfilled, then - * we must be doing flush left justification, so pad out to the - * right hand field boundary. - */ - while( stream->width-- > 0 ) - __pformat_putc( '\x20', stream ); - } - - else - { /* Value lies outside the acceptable range for fixed point; - * one significant digit will precede the radix point, so we - * decrement the precision to retain only the appropriate number - * of additional digits following it, when we emit the result - * in floating point format. - */ - if( (stream->flags & PFORMAT_HASHED) == PFORMAT_HASHED ) - /* - * The `#' flag is in effect... - * Adjust precision to emit the specified number of significant - * digits, with one preceding the radix point, and the balance - * following it, retaining any non-significant trailing zeros - * which are required to exactly match the requested precision... - */ - stream->precision--; - - else - /* The `#' flag is not in effect... - * Adjust precision to emit only significant digits, with one - * preceding the radix point, and any others following it, but - * suppressing non-significant trailing zeros... - */ - stream->precision = strlen( value ) - 1; - - /* Now, we format the result as any other floating point value. - */ - __pformat_emit_efloat( sign, value, intlen, stream ); - } - - /* Clean up `__pformat_ecvt()' memory allocation for `value'. - */ - __pformat_ecvt_release( value ); -} - -static -void __pformat_emit_xfloat( __pformat_fpreg_t value, __pformat_t *stream ) -{ - /* Helper for emitting floating point data, originating as - * either `double' or `long double' type, as a hexadecimal - * representation of the argument value. - */ - char buf[18], *p = buf; - __pformat_intarg_t exponent; short exp_width = 2; - - /* The mantissa field of the argument value representation can - * accommodate at most 16 hexadecimal digits, of which one will - * be placed before the radix point, leaving at most 15 digits - * to satisfy any requested precision; thus... - */ - if( (stream->precision >= 0) && (stream->precision < 15) ) - { - /* When the user specifies a precision within this range, - * we want to adjust the mantissa, to retain just the number - * of digits required, rounding up when the high bit of the - * leftmost discarded digit is set; (mask of 0x08 accounts - * for exactly one digit discarded, shifting 4 bits per - * digit, with up to 14 additional digits, to consume the - * full availability of 15 precision digits). - * - * However, before we perform the rounding operation, we - * normalise the mantissa, shifting it to the left by as many - * bit positions may be necessary, until its highest order bit - * is set, thus preserving the maximum number of bits in the - * rounded result as possible. - */ - while( value.__pformat_fpreg_mantissa < (LLONG_MAX + 1ULL) ) - value.__pformat_fpreg_mantissa <<= 1; - - /* We then shift the mantissa one bit position back to the - * right, to guard against possible overflow when the rounding - * adjustment is added. - */ - value.__pformat_fpreg_mantissa >>= 1; - - /* We now add the rounding adjustment, noting that to keep the - * 0x08 mask aligned with the shifted mantissa, we also need to - * shift it right by one bit initially, changing its starting - * value to 0x04... - */ - value.__pformat_fpreg_mantissa += 0x04LL << (4 * (14 - stream->precision)); - if( (value.__pformat_fpreg_mantissa & (LLONG_MAX + 1ULL)) == 0ULL ) - /* - * When the rounding adjustment would not have overflowed, - * then we shift back to the left again, to fill the vacated - * bit we reserved to accommodate the carry. - */ - value.__pformat_fpreg_mantissa <<= 1; - - else - /* Otherwise the rounding adjustment would have overflowed, - * so the carry has already filled the vacated bit; the effect - * of this is equivalent to an increment of the exponent. - */ - value.__pformat_fpreg_exponent++; - - /* We now complete the rounding to the required precision, by - * shifting the unwanted digits out, from the right hand end of - * the mantissa. - */ - value.__pformat_fpreg_mantissa >>= 4 * (15 - stream->precision); - } - - /* Encode the significant digits of the mantissa in hexadecimal - * ASCII notation, ready for transfer to the output stream... - */ - while( value.__pformat_fpreg_mantissa ) - { - /* taking the rightmost digit in each pass... - */ - int c = value.__pformat_fpreg_mantissa & 0xF; - if( c == value.__pformat_fpreg_mantissa ) - { - /* inserting the radix point, when we reach the last, - * (i.e. the most significant digit), unless we found no - * less significant digits, with no mandatory radix point - * inclusion, and no additional required precision... - */ - if( (p > buf) - || (stream->flags & PFORMAT_HASHED) || (stream->precision > 0) ) - /* - * Internally, we represent the radix point as an ASCII '.'; - * we will replace it with any locale specific alternative, - * at the time of transfer to the ultimate destination. - */ - *p++ = '.'; - - /* If the most significant hexadecimal digit of the encoded - * output value is greater than one, then the indicated value - * will appear too large, by an additional binary exponent - * corresponding to the number of higher order bit positions - * which it occupies... - */ - while( value.__pformat_fpreg_mantissa > 1 ) - { - /* so reduce the exponent value to compensate... - */ - value.__pformat_fpreg_exponent--; - value.__pformat_fpreg_mantissa >>= 1; - } - } - - else if( stream->precision > 0 ) - /* - * we have not yet fulfilled the desired precision, - * and we have not yet found the most significant digit, - * so account for the current digit, within the field - * width required to meet the specified precision. - */ - stream->precision--; - - if( (c > 0) || (p > buf) || (stream->precision >= 0) ) - /* - * Ignoring insignificant trailing zeros, (unless required to - * satisfy specified precision), store the current encoded digit - * into the pending output buffer, in LIFO order, and using the - * appropriate case for digits in the `A'..`F' range. - */ - *p++ = c > 9 ? (c - 10 + 'A') | (stream->flags & PFORMAT_XCASE) : c + '0'; - - /* Shift out the current digit, (4-bit logical shift right), - * to align the next more significant digit to be extracted, - * and encoded in the next pass. - */ - value.__pformat_fpreg_mantissa >>= 4; - } - - if( p == buf ) - { - /* Nothing has been queued for output... - * We need at least one zero, and possibly a radix point. - */ - if( (stream->precision > 0) || (stream->flags & PFORMAT_HASHED) ) - *p++ = '.'; - - *p++ = '0'; - } - - if( stream->width > 0 ) - { - /* Adjust the user specified field width, to account for the - * number of digits minimally required, to display the encoded - * value, at the requested precision. - * - * FIXME: this uses the minimum number of digits possible for - * representation of the binary exponent, in strict conformance - * with C99 and POSIX specifications. Although there appears to - * be no Microsoft precedent for doing otherwise, we may wish to - * relate this to the `_get_output_format()' result, to maintain - * consistency with `%e', `%f' and `%g' styles. - */ - int min_width = p - buf; - int exponent = value.__pformat_fpreg_exponent; - - /* If we have not yet queued sufficient digits to fulfil the - * requested precision, then we must adjust the minimum width - * specification, to accommodate the additional digits which - * are required to do so. - */ - if( stream->precision > 0 ) - min_width += stream->precision; - - /* Adjust the minimum width requirement, to accomodate the - * sign, radix indicator and at least one exponent digit... - */ - min_width += stream->flags & PFORMAT_SIGNED ? 6 : 5; - while( (exponent = exponent / 10) != 0 ) - { - /* and increase as required, if additional exponent digits - * are needed, also saving the exponent field width adjustment, - * for later use when that is emitted. - */ - min_width++; - exp_width++; - } - - if( stream->width > min_width ) - { - /* When specified field width exceeds the minimum required, - * adjust to retain only the excess... - */ - stream->width -= min_width; - - /* and then emit any required left side padding spaces. - */ - if( (stream->flags & PFORMAT_JUSTIFY) == 0 ) - while( stream->width-- > 0 ) - __pformat_putc( '\x20', stream ); - } - - else - /* Specified field width is insufficient; just ignore it! - */ - stream->width = PFORMAT_IGNORE; - } - - /* Emit the sign of the encoded value, as required... - */ - if( stream->flags & PFORMAT_NEGATIVE ) - /* - * this is mandatory, to indicate a negative value... - */ - __pformat_putc( '-', stream ); - - else if( stream->flags & PFORMAT_POSITIVE ) - /* - * but this is optional, for a positive value... - */ - __pformat_putc( '+', stream ); - - else if( stream->flags & PFORMAT_ADDSPACE ) - /* - * with this optional alternative. - */ - __pformat_putc( '\x20', stream ); - - /* Prefix a `0x' or `0X' radix indicator to the encoded value, - * with case appropriate to the format specification. - */ - __pformat_putc( '0', stream ); - __pformat_putc( 'X' | (stream->flags & PFORMAT_XCASE), stream ); - - /* If the `0' flag is in effect... - * Zero padding, to fill out the field, goes here... - */ - if( (stream->width > 0) && (stream->flags & PFORMAT_ZEROFILL) ) - while( stream->width-- > 0 ) - __pformat_putc( '0', stream ); - - /* Next, we emit the encoded value, without its exponent... - */ - while( p > buf ) - __pformat_emit_numeric_value( *--p, stream ); - - /* followed by any additional zeros needed to satisfy the - * precision specification... - */ - while( stream->precision-- > 0 ) - __pformat_putc( '0', stream ); - - /* then the exponent prefix, (C99 and POSIX specify `p'), - * in the case appropriate to the format specification... - */ - __pformat_putc( 'P' | (stream->flags & PFORMAT_XCASE), stream ); - - /* and finally, the decimal representation of the binary exponent, - * as a signed value with mandatory sign displayed, in a field width - * adjusted to accommodate it, LEFT justified, with any additional - * right side padding remaining from the original field width. - */ - stream->width += exp_width; - stream->flags |= PFORMAT_SIGNED; - exponent.__pformat_llong_t = value.__pformat_fpreg_exponent; - __pformat_int( exponent, stream ); -} - -static -void __pformat_xdouble( double x, __pformat_t *stream ) -{ - /* Handler for `%a' and `%A' format specifiers, (with argument - * value specified as `double' type). - */ - unsigned sign_bit = 0; - __pformat_fpreg_t z; z.__pformat_fpreg_double_t = x; - - /* First check for NaN; it is emitted unsigned... - */ - if( isnan( x ) ) - __pformat_emit_inf_or_nan( sign_bit, "NaN", stream ); - - else - { /* Capture the sign bit up-front, so we can show it correctly - * even when the argument value is zero or infinite. - */ - if( (sign_bit = (z.__pformat_fpreg_bitmap[3] & 0x8000)) != 0 ) - stream->flags |= PFORMAT_NEGATIVE; - - /* Check for infinity, (positive or negative)... - */ - if( isinf( x ) ) - /* - * displaying the appropriately signed indicator, - * when appropriate. - */ - __pformat_emit_inf_or_nan( sign_bit, "Inf", stream ); - - else - { /* The argument value is a representable number... - * first move its exponent into the appropriate field... - */ - z.__pformat_fpreg_bitmap[4] = (z.__pformat_fpreg_bitmap[3] >> 4) & 0x7FF; - - /* Realign the mantissa, leaving space for a - * normalised most significant digit... - */ - z.__pformat_fpreg_mantissa <<= 8; - z.__pformat_fpreg_bitmap[3] = (z.__pformat_fpreg_bitmap[3] & 0x0FFF); - - /* Check for zero value... - */ - if( z.__pformat_fpreg_exponent || z.__pformat_fpreg_mantissa ) - { - /* and only when the value is non-zero, - * eliminate the bias from the exponent... - */ - z.__pformat_fpreg_exponent -= 0x3FF; - - /* Check for a possible denormalised value... - */ - if( z.__pformat_fpreg_exponent > -126 ) - /* - * and normalise when it isn't. - */ - z.__pformat_fpreg_bitmap[3] += 0x1000; - } - - /* Finally, hand the adjusted representation off to the generalised - * hexadecimal floating point format handler... - */ - __pformat_emit_xfloat( z, stream ); - } - } -} - -static -void __pformat_xldouble( long double x, __pformat_t *stream ) -{ - /* Handler for `%La' and `%LA' format specifiers, (with argument - * value specified as `long double' type). - */ - unsigned sign_bit = 0; - __pformat_fpreg_t z; z.__pformat_fpreg_ldouble_t = x; - - /* First check for NaN; it is emitted unsigned... - */ - if( isnan( x ) ) - __pformat_emit_inf_or_nan( sign_bit, "NaN", stream ); - - else - { /* Capture the sign bit up-front, so we can show it correctly - * even when the argument value is zero or infinite. - */ - if( (sign_bit = (z.__pformat_fpreg_exponent & 0x8000)) != 0 ) - stream->flags |= PFORMAT_NEGATIVE; - - /* Check for infinity, (positive or negative)... - */ - if( isinf( x ) ) - /* - * displaying the appropriately signed indicator, - * when appropriate. - */ - __pformat_emit_inf_or_nan( sign_bit, "Inf", stream ); - - else - { /* The argument value is a representable number... - * extract the effective value of the biased exponent... - */ - z.__pformat_fpreg_exponent &= 0x7FFF; - if( z.__pformat_fpreg_exponent || z.__pformat_fpreg_mantissa ) - /* - * and if the argument value itself is non-zero, - * eliminate the bias from the exponent... - */ - z.__pformat_fpreg_exponent -= 0x3FFF; - - /* Finally, hand the adjusted representation off to the - * generalised hexadecimal floating point format handler... - */ - __pformat_emit_xfloat( z, stream ); - } - } -} - -int __pformat( int flags, void *dest, int max, const char *fmt, va_list argv ) -{ - int c; - - __pformat_t stream = - { - /* Create and initialise a format control block - * for this output request. - */ - dest, /* output goes to here */ - flags &= PFORMAT_TO_FILE | PFORMAT_NOLIMIT, /* only these valid initially */ - PFORMAT_IGNORE, /* no field width yet */ - PFORMAT_IGNORE, /* nor any precision spec */ - PFORMAT_RPINIT, /* radix point uninitialised */ - (wchar_t)(0), /* leave it unspecified */ - 0, /* zero output char count */ - max, /* establish output limit */ - PFORMAT_MINEXP /* exponent chars preferred */ - }; - - format_scan: while( (c = *fmt++) != 0 ) - { - /* Format string parsing loop... - * The entry point is labelled, so that we can return to the start state - * from within the inner `conversion specification' interpretation loop, - * as soon as a conversion specification has been resolved. - */ - if( c == '%' ) - { - /* Initiate parsing of a `conversion specification'... - */ - __pformat_intarg_t argval; - __pformat_state_t state = PFORMAT_INIT; - __pformat_length_t length = PFORMAT_LENGTH_INT; - - /* Save the current format scan position, so that we can backtrack - * in the event of encountering an invalid format specification... - */ - const char *backtrack = fmt; - - /* Restart capture for dynamic field width and precision specs... - */ - int *width_spec = &stream.width; - - /* Reset initial state for flags, width and precision specs... - */ - stream.flags = flags; - stream.width = stream.precision = PFORMAT_IGNORE; - - while( *fmt ) - { - switch( c = *fmt++ ) - { - /* Data type specifiers... - * All are terminal, so exit the conversion spec parsing loop - * with a `goto format_scan', thus resuming at the outer level - * in the regular format string parser. - */ - case '%': - /* - * Not strictly a data type specifier... - * it simply converts as a literal `%' character. - * - * FIXME: should we require this to IMMEDIATELY follow the - * initial `%' of the "conversion spec"? (glibc `printf()' - * on GNU/Linux does NOT appear to require this, but POSIX - * and SUSv3 do seem to demand it). - */ - __pformat_putc( c, &stream ); - goto format_scan; - - case 'C': - /* - * Equivalent to `%lc'; set `length' accordingly, - * and simply fall through. - */ - length = PFORMAT_LENGTH_LONG; - - case 'c': - /* - * Single, (or single multibyte), character output... - * - * We handle these by copying the argument into our local - * `argval' buffer, and then we pass the address of that to - * either `__pformat_putchars()' or `__pformat_wputchars()', - * as appropriate, effectively formatting it as a string of - * the appropriate type, with a length of one. - * - * A side effect of this method of handling character data - * is that, if the user sets a precision of zero, then no - * character is actually emitted; we don't want that, so we - * forcibly override any user specified precision. - */ - stream.precision = PFORMAT_IGNORE; - - /* Now we invoke the appropriate format handler... - */ - if( (length == PFORMAT_LENGTH_LONG) - || (length == PFORMAT_LENGTH_LLONG) ) - { - /* considering any `long' type modifier as a reference to - * `wchar_t' data, (which is promoted to an `int' argument)... - */ - wchar_t argval = (wchar_t)(va_arg( argv, int )); - __pformat_wputchars( &argval, 1, &stream ); - } - - else - { /* while anything else is simply taken as `char', (which - * is also promoted to an `int' argument)... - */ - argval.__pformat_uchar_t = (unsigned char)(va_arg( argv, int )); - __pformat_putchars( (char *)(&argval), 1, &stream ); - } - goto format_scan; - - case 'S': - /* - * Equivalent to `%ls'; set `length' accordingly, - * and simply fall through. - */ - length = PFORMAT_LENGTH_LONG; - - case 's': - if( (length == PFORMAT_LENGTH_LONG) - || (length == PFORMAT_LENGTH_LLONG) ) - { - /* considering any `long' type modifier as a reference to - * a `wchar_t' string... - */ - __pformat_wcputs( va_arg( argv, wchar_t * ), &stream ); - } - - else - /* This is normal string output; - * we simply invoke the appropriate handler... - */ - __pformat_puts( va_arg( argv, char * ), &stream ); - - goto format_scan; - - case 'o': - case 'u': - case 'x': - case 'X': - /* - * Unsigned integer values; octal, decimal or hexadecimal format... - */ - if( length == PFORMAT_LENGTH_LLONG ) - /* - * with an `unsigned long long' argument, which we - * process `as is'... - */ - argval.__pformat_ullong_t = va_arg( argv, unsigned long long ); - - else if( length == PFORMAT_LENGTH_LONG ) - /* - * or with an `unsigned long', which we promote to - * `unsigned long long'... - */ - argval.__pformat_ullong_t = va_arg( argv, unsigned long ); - - else - { /* or for any other size, which will have been promoted - * to `unsigned int', we select only the appropriately sized - * least significant segment, and again promote to the same - * size as `unsigned long long'... - */ - argval.__pformat_ullong_t = va_arg( argv, unsigned int ); - if( length == PFORMAT_LENGTH_SHORT ) - /* - * from `unsigned short'... - */ - argval.__pformat_ullong_t = argval.__pformat_ushort_t; - - else if( length == PFORMAT_LENGTH_CHAR ) - /* - * or even from `unsigned char'... - */ - argval.__pformat_ullong_t = argval.__pformat_uchar_t; - } - - /* so we can pass any size of argument to either of two - * common format handlers... - */ - if( c == 'u' ) - /* - * depending on whether output is to be encoded in - * decimal format... - */ - __pformat_int( argval, &stream ); - - else - /* or in octal or hexadecimal format... - */ - __pformat_xint( c, argval, &stream ); - - goto format_scan; - - case 'd': - case 'i': - /* - * Signed integer values; decimal format... - * This is similar to `u', but must process `argval' as signed, - * and be prepared to handle negative numbers. - */ - stream.flags |= PFORMAT_NEGATIVE; - - if( length == PFORMAT_LENGTH_LLONG ) - /* - * The argument is a `long long' type... - */ - argval.__pformat_llong_t = va_arg( argv, long long ); - - else if( length == PFORMAT_LENGTH_LONG ) - /* - * or here, a `long' type... - */ - argval.__pformat_llong_t = va_arg( argv, long ); - - else - { /* otherwise, it's an `int' type... - */ - argval.__pformat_llong_t = va_arg( argv, int ); - if( length == PFORMAT_LENGTH_SHORT ) - /* - * but it was promoted from a `short' type... - */ - argval.__pformat_llong_t = argval.__pformat_short_t; - else if( length == PFORMAT_LENGTH_CHAR ) - /* - * or even from a `char' type... - */ - argval.__pformat_llong_t = argval.__pformat_char_t; - } - - /* In any case, all share a common handler... - */ - __pformat_int( argval, &stream ); - goto format_scan; - - case 'p': - /* - * Pointer argument; format as hexadecimal, subject to... - */ - if( (state == PFORMAT_INIT) && (stream.flags == flags) ) - { - /* Here, the user didn't specify any particular - * formatting attributes. We must choose a default - * which will be compatible with Microsoft's (broken) - * scanf() implementation, (i.e. matching the default - * used by MSVCRT's printf(), which appears to resemble - * "%0.8X" for 32-bit pointers); in particular, we MUST - * NOT adopt a GNU-like format resembling "%#x", because - * Microsoft's scanf() will choke on the "0x" prefix. - */ - stream.flags |= PFORMAT_ZEROFILL; - stream.precision = 2 * sizeof( uintptr_t ); - } - argval.__pformat_ullong_t = va_arg( argv, uintptr_t ); - __pformat_xint( 'x', argval, &stream ); - goto format_scan; - - case 'e': - /* - * Floating point format, with lower case exponent indicator - * and lower case `inf' or `nan' representation when required; - * select lower case mode, and simply fall through... - */ - stream.flags |= PFORMAT_XCASE; - - case 'E': - /* - * Floating point format, with upper case exponent indicator - * and upper case `INF' or `NAN' representation when required, - * (or lower case for all of these, on fall through from above); - * select lower case mode, and simply fall through... - */ - if( stream.flags & PFORMAT_LDOUBLE ) - /* - * for a `long double' argument... - */ - __pformat_efloat( va_arg( argv, long double ), &stream ); - - else - /* or just a `double', which we promote to `long double', - * so the two may share a common format handler. - */ - __pformat_efloat( (long double)(va_arg( argv, double )), &stream ); - - goto format_scan; - - case 'f': - /* - * Fixed point format, using lower case for `inf' and - * `nan', when appropriate; select lower case mode, and - * simply fall through... - */ - stream.flags |= PFORMAT_XCASE; - - case 'F': - /* - * Fixed case format using upper case, or lower case on - * fall through from above, for `INF' and `NAN'... - */ - if( stream.flags & PFORMAT_LDOUBLE ) - /* - * for a `long double' argument... - */ - __pformat_float( va_arg( argv, long double ), &stream ); - - else - /* or just a `double', which we promote to `long double', - * so the two may share a common format handler. - */ - __pformat_float( (long double)(va_arg( argv, double )), &stream ); - - goto format_scan; - - case 'g': - /* - * Generalised floating point format, with lower case - * exponent indicator when required; select lower case - * mode, and simply fall through... - */ - stream.flags |= PFORMAT_XCASE; - - case 'G': - /* - * Generalised floating point format, with upper case, - * or on fall through from above, with lower case exponent - * indicator when required... - */ - if( stream.flags & PFORMAT_LDOUBLE ) - /* - * for a `long double' argument... - */ - __pformat_gfloat( va_arg( argv, long double ), &stream ); - - else - /* or just a `double', which we promote to `long double', - * so the two may share a common format handler. - */ - __pformat_gfloat( (long double)(va_arg( argv, double )), &stream ); - - goto format_scan; - - case 'a': - /* - * Hexadecimal floating point format, with lower case radix - * and exponent indicators; select the lower case mode, and - * fall through... - */ - stream.flags |= PFORMAT_XCASE; - - case 'A': - /* - * Hexadecimal floating point format; handles radix and - * exponent indicators in either upper or lower case... - */ - if( stream.flags & PFORMAT_LDOUBLE ) - /* - * with a `long double' argument... - */ - __pformat_xldouble( va_arg( argv, long double ), &stream ); - - else - /* or just a `double'. - */ - __pformat_xdouble( va_arg( argv, double ), &stream ); - - goto format_scan; - - case 'n': - /* - * Save current output character count... - */ - if( length == PFORMAT_LENGTH_CHAR ) - /* - * to a signed `char' destination... - */ - *va_arg( argv, char * ) = stream.count; - - else if( length == PFORMAT_LENGTH_SHORT ) - /* - * or to a signed `short'... - */ - *va_arg( argv, short * ) = stream.count; - - else if( length == PFORMAT_LENGTH_LONG ) - /* - * or to a signed `long'... - */ - *va_arg( argv, long * ) = stream.count; - - else if( length == PFORMAT_LENGTH_LLONG ) - /* - * or to a signed `long long'... - */ - *va_arg( argv, long long * ) = stream.count; - - else - /* - * or, by default, to a signed `int'. - */ - *va_arg( argv, int * ) = stream.count; - - goto format_scan; - - /* Argument length modifiers... - * These are non-terminal; each sets the format parser - * into the PFORMAT_END state, and ends with a `break'. - */ - case 'h': - /* - * Interpret the argument as explicitly of a `short' - * or `char' data type, truncated from the standard - * length defined for integer promotion. - */ - if( *fmt == 'h' ) - { - /* Modifier is `hh'; data type is `char' sized... - * Skip the second `h', and set length accordingly. - */ - ++fmt; - length = PFORMAT_LENGTH_CHAR; - } - - else - /* Modifier is `h'; data type is `short' sized... - */ - length = PFORMAT_LENGTH_SHORT; - - state = PFORMAT_END; - break; - - case 'j': - /* - * Interpret the argument as being of the same size as - * a `intmax_t' entity... - */ - length = __pformat_arg_length( intmax_t ); - state = PFORMAT_END; - break; - -# ifdef _WIN32 - - case 'I': - /* - * The MSVCRT implementation of the printf() family of - * functions explicitly uses... - */ - if( (fmt[0] == '6') && (fmt[1] == '4') ) - { - /* I64' instead of `ll', - * when referring to `long long' integer types... - */ - length = PFORMAT_LENGTH_LLONG; - fmt += 2; - } - - else if( (fmt[0] == '3') && (fmt[1] == '2') ) - { - /* and `I32' instead of `l', - * when referring to `long' integer types... - */ - length = PFORMAT_LENGTH_LONG; - fmt += 2; - } - - else - /* or unqualified `I' instead of `t' or `z', - * when referring to `ptrdiff_t' or `size_t' entities; - * (we will choose to map it to `ptrdiff_t'). - */ - length = __pformat_arg_length( ptrdiff_t ); - - state = PFORMAT_END; - break; - -# endif - - case 'l': - /* - * Interpret the argument as explicitly of a - * `long' or `long long' data type. - */ - if( *fmt == 'l' ) - { - /* Modifier is `ll'; data type is `long long' sized... - * Skip the second `l', and set length accordingly. - */ - ++fmt; - length = PFORMAT_LENGTH_LLONG; - } - - else - /* Modifier is `l'; data type is `long' sized... - */ - length = PFORMAT_LENGTH_LONG; - -# ifndef _WIN32 - /* - * Microsoft's MSVCRT implementation also uses `l' - * as a modifier for `long double'; if we don't want - * to support that, we end this case here... - */ - state = PFORMAT_END; - break; - - /* otherwise, we simply fall through... - */ -# endif - - case 'L': - /* - * Identify the appropriate argument as a `long double', - * when associated with `%a', `%A', `%e', `%E', `%f', `%F', - * `%g' or `%G' format specifications. - */ - stream.flags |= PFORMAT_LDOUBLE; - state = PFORMAT_END; - break; - - case 't': - /* - * Interpret the argument as being of the same size as - * a `ptrdiff_t' entity... - */ - length = __pformat_arg_length( ptrdiff_t ); - state = PFORMAT_END; - break; - - case 'z': - /* - * Interpret the argument as being of the same size as - * a `size_t' entity... - */ - length = __pformat_arg_length( size_t ); - state = PFORMAT_END; - break; - - /* Precision indicator... - * May appear once only; it must precede any modifier - * for argument length, or any data type specifier. - */ - case '.': - if( state < PFORMAT_GET_PRECISION ) - { - /* We haven't seen a precision specification yet, - * so initialise it to zero, (in case no digits follow), - * and accept any following digits as the precision. - */ - stream.precision = 0; - width_spec = &stream.precision; - state = PFORMAT_GET_PRECISION; - } - - else - /* We've already seen a precision specification, - * so this is just junk; proceed to end game. - */ - state = PFORMAT_END; - - /* Either way, we must not fall through here. - */ - break; - - /* Variable field width, or precision specification, - * derived from the argument list... - */ - case '*': - /* - * When this appears... - */ - if( width_spec - && ((state == PFORMAT_INIT) || (state == PFORMAT_GET_PRECISION)) ) - { - /* in proper context; assign to field width - * or precision, as appropriate. - */ - if( (*width_spec = va_arg( argv, int )) < 0 ) - { - /* Assigned value was negative... - */ - if( state == PFORMAT_INIT ) - { - /* For field width, this is equivalent to - * a positive value with the `-' flag... - */ - stream.flags |= PFORMAT_LJUSTIFY; - stream.width = -stream.width; - } - - else - /* while as a precision specification, - * it should simply be ignored. - */ - stream.precision = PFORMAT_IGNORE; - } - } - - else - /* out of context; give up on width and precision - * specifications for this conversion. - */ - state = PFORMAT_END; - - /* Mark as processed... - * we must not see `*' again, in this context. - */ - width_spec = NULL; - break; - - /* Formatting flags... - * Must appear while in the PFORMAT_INIT state, - * and are non-terminal, so again, end with `break'. - */ - case '#': - /* - * Select alternate PFORMAT_HASHED output style. - */ - if( state == PFORMAT_INIT ) - stream.flags |= PFORMAT_HASHED; - break; - - case '+': - /* - * Print a leading sign with numeric output, - * for both positive and negative values. - */ - if( state == PFORMAT_INIT ) - stream.flags |= PFORMAT_POSITIVE; - break; - - case '-': - /* - * Select left justification of displayed output - * data, within the output field width, instead of - * the default flush right justification. - */ - if( state == PFORMAT_INIT ) - stream.flags |= PFORMAT_LJUSTIFY; - break; - -# ifdef WITH_XSI_FEATURES - - case '\'': - /* - * This is an XSI extension to the POSIX standard, - * which we do not support, at present. - */ - if( state == PFORMAT_INIT ) - stream.flags |= PFORMAT_GROUPED; - break; - -# endif - - case '\x20': - /* - * Reserve a single space, within the output field, - * for display of the sign of signed data; this will - * be occupied by the minus sign, if the data value - * is negative, or by a plus sign if the data value - * is positive AND the `+' flag is also present, or - * by a space otherwise. (Technically, this flag - * is redundant, if the `+' flag is present). - */ - if( state == PFORMAT_INIT ) - stream.flags |= PFORMAT_ADDSPACE; - break; - - case '0': - /* - * May represent a flag, to activate the `pad with zeros' - * option, or it may simply be a digit in a width or in a - * precision specification... - */ - if( state == PFORMAT_INIT ) - { - /* This is the flag usage... - */ - stream.flags |= PFORMAT_ZEROFILL; - break; - } - - default: - /* - * If we didn't match anything above, then we will check - * for digits, which we may accumulate to generate field - * width or precision specifications... - */ - if( (state < PFORMAT_END) && ('9' >= c) && (c >= '0') ) - { - if( state == PFORMAT_INIT ) - /* - * Initial digits explicitly relate to field width... - */ - state = PFORMAT_SET_WIDTH; - - else if( state == PFORMAT_GET_PRECISION ) - /* - * while those following a precision indicator - * explicitly relate to precision. - */ - state = PFORMAT_SET_PRECISION; - - if( width_spec ) - { - /* We are accepting a width or precision specification... - */ - if( *width_spec < 0 ) - /* - * and accumulation hasn't started yet; we simply - * initialise the accumulator with the current digit - * value, converting from ASCII to decimal. - */ - *width_spec = c - '0'; - - else - /* Accumulation has already started; we perform a - * `leftwise decimal digit shift' on the accumulator, - * (i.e. multiply it by ten), then add the decimal - * equivalent value of the current digit. - */ - *width_spec = *width_spec * 10 + c - '0'; - } - } - - else - { - /* We found a digit out of context, or some other character - * with no designated meaning; reject this format specification, - * backtrack, and emit it as literal text... - */ - fmt = backtrack; - __pformat_putc( '%', &stream ); - goto format_scan; - } - } - } - } - - else - /* We just parsed a character which is not included within any format - * specification; we simply emit it as a literal. - */ - __pformat_putc( c, &stream ); - } - - /* When we have fully dispatched the format string, the return value is the - * total number of bytes we transferred to the output destination. - */ - return stream.count; -} - -/* $RCSfile$Revision$: end of file */ |