634 lines
20 KiB
C
634 lines
20 KiB
C
/*
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* Copyright (c) 1990, 2007 The Regents of the University of California.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms are permitted
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* provided that the above copyright notice and this paragraph are
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* duplicated in all such forms and that any documentation,
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* and/or other materials related to such
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* distribution and use acknowledge that the software was developed
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* by the University of California, Berkeley. The name of the
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* University may not be used to endorse or promote products derived
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* from this software without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*/
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/*
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FUNCTION
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<<swprintf>>, <<fwprintf>>, <<wprintf>>---wide character format output
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INDEX
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fwprintf
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INDEX
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_fwprintf_r
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INDEX
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wprintf
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INDEX
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_wprintf_r
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INDEX
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swprintf
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INDEX
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_swprintf_r
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SYNOPSIS
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#include <wchar.h>
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int wprintf(const wchar_t *<[format]>, ...);
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int fwprintf(FILE *__restrict <[fd]>,
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const wchar_t *__restrict <[format]>, ...);
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int swprintf(wchar_t *__restrict <[str]>, size_t <[size]>,
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const wchar_t *__restrict <[format]>, ...);
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int _wprintf_r(struct _reent *<[ptr]>, const wchar_t *<[format]>, ...);
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int _fwprintf_r(struct _reent *<[ptr]>, FILE *<[fd]>,
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const wchar_t *<[format]>, ...);
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int _swprintf_r(struct _reent *<[ptr]>, wchar_t *<[str]>,
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size_t <[size]>, const wchar_t *<[format]>, ...);
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DESCRIPTION
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<<wprintf>> accepts a series of arguments, applies to each a
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format specifier from <<*<[format]>>>, and writes the
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formatted data to <<stdout>>, without a terminating NUL
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wide character. The behavior of <<wprintf>> is undefined if there
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are not enough arguments for the format or if any argument is not the
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right type for the corresponding conversion specifier. <<wprintf>>
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returns when it reaches the end of the format string. If there are
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more arguments than the format requires, excess arguments are
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ignored.
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<<fwprintf>> is like <<wprintf>>, except that output is directed
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to the stream <[fd]> rather than <<stdout>>.
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<<swprintf>> is like <<wprintf>>, except that output is directed
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to the buffer <[str]> with a terminating wide <<NUL>>, and the
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resulting string length is limited to at most <[size]> wide characters,
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including the terminating <<NUL>>. It is considered an error if the
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output (including the terminating wide-<<NULL>>) does not fit into
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<[size]> wide characters. (This error behavior is not the same as for
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<<snprintf>>, which <<swprintf>> is otherwise completely analogous to.
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While <<snprintf>> allows the needed size to be known simply by giving
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<[size]>=0, <<swprintf>> does not, giving an error instead.)
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For <<swprintf>> the behavior is undefined if the output
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<<*<[str]>>> overlaps with one of the arguments. Behavior is also
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undefined if the argument for <<%n>> within <<*<[format]>>>
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overlaps another argument.
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<[format]> is a pointer to a wide character string containing two
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types of objects: ordinary characters (other than <<%>>),
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which are copied unchanged to the output, and conversion
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specifications, each of which is introduced by <<%>>. (To
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include <<%>> in the output, use <<%%>> in the format string.)
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A conversion specification has the following form:
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. %[<[pos]>][<[flags]>][<[width]>][.<[prec]>][<[size]>]<[type]>
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The fields of the conversion specification have the following
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meanings:
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O+
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o <[pos]>
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Conversions normally consume arguments in the order that they
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are presented. However, it is possible to consume arguments
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out of order, and reuse an argument for more than one
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conversion specification (although the behavior is undefined
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if the same argument is requested with different types), by
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specifying <[pos]>, which is a decimal integer followed by
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'$'. The integer must be between 1 and <NL_ARGMAX> from
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limits.h, and if argument <<%n$>> is requested, all earlier
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arguments must be requested somewhere within <[format]>. If
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positional parameters are used, then all conversion
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specifications except for <<%%>> must specify a position.
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This positional parameters method is a POSIX extension to the C
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standard definition for the functions.
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o <[flags]>
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<[flags]> is an optional sequence of characters which control
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output justification, numeric signs, decimal points, trailing
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zeros, and octal and hex prefixes. The flag characters are
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minus (<<->>), plus (<<+>>), space ( ), zero (<<0>>), sharp
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(<<#>>), and quote (<<'>>). They can appear in any
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combination, although not all flags can be used for all
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conversion specification types.
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o+
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o '
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A POSIX extension to the C standard. However, this
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implementation presently treats it as a no-op, which
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is the default behavior for the C locale, anyway. (If
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it did what it is supposed to, when <[type]> were <<i>>,
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<<d>>, <<u>>, <<f>>, <<F>>, <<g>>, or <<G>>, the
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integer portion of the conversion would be formatted
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with thousands' grouping wide characters.)
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o -
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The result of the conversion is left
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justified, and the right is padded with
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blanks. If you do not use this flag, the
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result is right justified, and padded on the
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left.
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o +
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The result of a signed conversion (as
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determined by <[type]> of <<d>>, <<i>>, <<a>>,
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<<A>>, <<e>>, <<E>>, <<f>>, <<F>>, <<g>>, or
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<<G>>) will always begin with a plus or minus
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sign. (If you do not use this flag, positive
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values do not begin with a plus sign.)
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o " " (space)
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If the first character of a signed conversion
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specification is not a sign, or if a signed
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conversion results in no characters, the
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result will begin with a space. If the space
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( ) flag and the plus (<<+>>) flag both
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appear, the space flag is ignored.
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o 0
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If the <[type]> character is <<d>>, <<i>>,
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<<o>>, <<u>>, <<x>>, <<X>>, <<a>>, <<A>>,
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<<e>>, <<E>>, <<f>>, <<F>>, <<g>>, or <<G>>: leading
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zeros are used to pad the field width
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(following any indication of sign or base); no
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spaces are used for padding. If the zero
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(<<0>>) and minus (<<->>) flags both appear,
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the zero (<<0>>) flag will be ignored. For
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<<d>>, <<i>>, <<o>>, <<u>>, <<x>>, and <<X>>
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conversions, if a precision <[prec]> is
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specified, the zero (<<0>>) flag is ignored.
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Note that <<0>> is interpreted as a flag, not
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as the beginning of a field width.
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o #
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The result is to be converted to an
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alternative form, according to the <[type]>
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character.
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o-
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The alternative form output with the # flag depends on the <[type]>
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character:
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o+
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o o
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Increases precision to force the first
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digit of the result to be a zero.
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o x
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A non-zero result will have a <<0x>>
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prefix.
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o X
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A non-zero result will have a <<0X>>
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prefix.
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o a, A, e, E, f, or F
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The result will always contain a
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decimal point even if no digits follow
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the point. (Normally, a decimal point
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appears only if a digit follows it.)
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Trailing zeros are removed.
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o g or G
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The result will always contain a
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decimal point even if no digits follow
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the point. Trailing zeros are not
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removed.
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o all others
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Undefined.
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o-
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o <[width]>
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<[width]> is an optional minimum field width. You can
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either specify it directly as a decimal integer, or
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indirectly by using instead an asterisk (<<*>>), in
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which case an <<int>> argument is used as the field
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width. If positional arguments are used, then the
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width must also be specified positionally as <<*m$>>,
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with m as a decimal integer. Negative field widths
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are treated as specifying the minus (<<->>) flag for
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left justfication, along with a positive field width.
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The resulting format may be wider than the specified
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width.
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o <[prec]>
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<[prec]> is an optional field; if present, it is
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introduced with `<<.>>' (a period). You can specify
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the precision either directly as a decimal integer or
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indirectly by using an asterisk (<<*>>), in which case
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an <<int>> argument is used as the precision. If
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positional arguments are used, then the precision must
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also be specified positionally as <<*m$>>, with m as a
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decimal integer. Supplying a negative precision is
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equivalent to omitting the precision. If only a
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period is specified the precision is zero. The effect
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depends on the conversion <[type]>.
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o+
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o d, i, o, u, x, or X
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Minimum number of digits to appear. If no
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precision is given, defaults to 1.
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o a or A
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Number of digits to appear after the decimal
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point. If no precision is given, the
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precision defaults to the minimum needed for
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an exact representation.
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o e, E, f or F
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Number of digits to appear after the decimal
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point. If no precision is given, the
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precision defaults to 6.
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o g or G
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Maximum number of significant digits. A
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precision of 0 is treated the same as a
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precision of 1. If no precision is given, the
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precision defaults to 6.
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o s or S
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Maximum number of characters to print from the
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string. If no precision is given, the entire
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string is printed.
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o all others
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undefined.
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o-
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o <[size]>
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<[size]> is an optional modifier that changes the data
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type that the corresponding argument has. Behavior is
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unspecified if a size is given that does not match the
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<[type]>.
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o+
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o hh
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With <<d>>, <<i>>, <<o>>, <<u>>, <<x>>, or
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<<X>>, specifies that the argument should be
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converted to a <<signed char>> or <<unsigned
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char>> before printing.
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With <<n>>, specifies that the argument is a
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pointer to a <<signed char>>.
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o h
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With <<d>>, <<i>>, <<o>>, <<u>>, <<x>>, or
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<<X>>, specifies that the argument should be
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converted to a <<short>> or <<unsigned short>>
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before printing.
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With <<n>>, specifies that the argument is a
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pointer to a <<short>>.
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o l
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With <<d>>, <<i>>, <<o>>, <<u>>, <<x>>, or
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<<X>>, specifies that the argument is a
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<<long>> or <<unsigned long>>.
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With <<c>>, specifies that the argument has
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type <<wint_t>>.
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With <<s>>, specifies that the argument is a
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pointer to <<wchar_t>>.
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With <<n>>, specifies that the argument is a
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pointer to a <<long>>.
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With <<a>>, <<A>>, <<e>>, <<E>>, <<f>>, <<F>>,
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<<g>>, or <<G>>, has no effect (because of
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vararg promotion rules, there is no need to
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distinguish between <<float>> and <<double>>).
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o ll
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With <<d>>, <<i>>, <<o>>, <<u>>, <<x>>, or
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<<X>>, specifies that the argument is a
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<<long long>> or <<unsigned long long>>.
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With <<n>>, specifies that the argument is a
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pointer to a <<long long>>.
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o j
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With <<d>>, <<i>>, <<o>>, <<u>>, <<x>>, or
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<<X>>, specifies that the argument is an
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<<intmax_t>> or <<uintmax_t>>.
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With <<n>>, specifies that the argument is a
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pointer to an <<intmax_t>>.
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o z
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With <<d>>, <<i>>, <<o>>, <<u>>, <<x>>, or
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<<X>>, specifies that the argument is a <<size_t>>.
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With <<n>>, specifies that the argument is a
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pointer to a <<size_t>>.
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o t
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With <<d>>, <<i>>, <<o>>, <<u>>, <<x>>, or
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<<X>>, specifies that the argument is a
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<<ptrdiff_t>>.
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With <<n>>, specifies that the argument is a
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pointer to a <<ptrdiff_t>>.
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o L
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With <<a>>, <<A>>, <<e>>, <<E>>, <<f>>, <<F>>,
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<<g>>, or <<G>>, specifies that the argument
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is a <<long double>>.
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o-
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o <[type]>
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<[type]> specifies what kind of conversion <<wprintf>>
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performs. Here is a table of these:
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o+
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o %
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Prints the percent character (<<%>>).
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o c
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If no <<l>> qualifier is present, the int argument shall
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be converted to a wide character as if by calling
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the btowc() function and the resulting wide character
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shall be written. Otherwise, the wint_t argument
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shall be converted to wchar_t, and written.
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o C
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Short for <<%lc>>. A POSIX extension to the C standard.
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o s
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If no <<l>> qualifier is present, the application
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shall ensure that the argument is a pointer to a
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character array containing a character sequence
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beginning in the initial shift state. Characters
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from the array shall be converted as if by repeated
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calls to the mbrtowc() function, with the conversion
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state described by an mbstate_t object initialized to
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zero before the first character is converted, and
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written up to (but not including) the terminating
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null wide character. If the precision is specified,
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no more than that many wide characters shall be
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written. If the precision is not specified, or is
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greater than the size of the array, the application
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shall ensure that the array contains a null wide
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character.
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If an <<l>> qualifier is present, the application
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shall ensure that the argument is a pointer to an
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array of type wchar_t. Wide characters from the array
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shall be written up to (but not including) a
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terminating null wide character. If no precision is
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specified, or is greater than the size of the array,
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the application shall ensure that the array contains
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a null wide character. If a precision is specified,
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no more than that many wide characters shall be
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written.
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o S
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Short for <<%ls>>. A POSIX extension to the C standard.
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o d or i
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Prints a signed decimal integer; takes an
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<<int>>. Leading zeros are inserted as
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necessary to reach the precision. A value of 0 with
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a precision of 0 produces an empty string.
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o o
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Prints an unsigned octal integer; takes an
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<<unsigned>>. Leading zeros are inserted as
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necessary to reach the precision. A value of 0 with
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a precision of 0 produces an empty string.
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o u
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Prints an unsigned decimal integer; takes an
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<<unsigned>>. Leading zeros are inserted as
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necessary to reach the precision. A value of 0 with
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a precision of 0 produces an empty string.
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o x
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Prints an unsigned hexadecimal integer (using
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<<abcdef>> as digits beyond <<9>>); takes an
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<<unsigned>>. Leading zeros are inserted as
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necessary to reach the precision. A value of 0 with
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a precision of 0 produces an empty string.
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o X
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Like <<x>>, but uses <<ABCDEF>> as digits
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beyond <<9>>.
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o f
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Prints a signed value of the form
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<<[-]9999.9999>>, with the precision
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determining how many digits follow the decimal
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point; takes a <<double>> (remember that
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<<float>> promotes to <<double>> as a vararg).
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The low order digit is rounded to even. If
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the precision results in at most DECIMAL_DIG
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digits, the result is rounded correctly; if
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more than DECIMAL_DIG digits are printed, the
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result is only guaranteed to round back to the
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original value.
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If the value is infinite, the result is
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<<inf>>, and no zero padding is performed. If
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the value is not a number, the result is
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<<nan>>, and no zero padding is performed.
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o F
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Like <<f>>, but uses <<INF>> and <<NAN>> for
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non-finite numbers.
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o e
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Prints a signed value of the form
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<<[-]9.9999e[+|-]999>>; takes a <<double>>.
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The digit before the decimal point is non-zero
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if the value is non-zero. The precision
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determines how many digits appear between
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<<.>> and <<e>>, and the exponent always
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contains at least two digits. The value zero
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has an exponent of zero. If the value is not
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finite, it is printed like <<f>>.
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o E
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Like <<e>>, but using <<E>> to introduce the
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exponent, and like <<F>> for non-finite
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values.
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o g
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Prints a signed value in either <<f>> or <<e>>
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form, based on the given value and
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precision---an exponent less than -4 or
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greater than the precision selects the <<e>>
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form. Trailing zeros and the decimal point
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are printed only if necessary; takes a
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<<double>>.
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o G
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Like <<g>>, except use <<F>> or <<E>> form.
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o a
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Prints a signed value of the form
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<<[-]0x1.ffffp[+|-]9>>; takes a <<double>>.
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The letters <<abcdef>> are used for digits
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beyond <<9>>. The precision determines how
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many digits appear after the decimal point.
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The exponent contains at least one digit, and
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is a decimal value representing the power of
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2; a value of 0 has an exponent of 0.
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Non-finite values are printed like <<f>>.
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o A
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Like <<a>>, except uses <<X>>, <<P>>, and
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<<ABCDEF>> instead of lower case.
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o n
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Takes a pointer to <<int>>, and stores a count
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of the number of bytes written so far. No
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output is created.
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o p
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Takes a pointer to <<void>>, and prints it in
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an implementation-defined format. This
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implementation is similar to <<%#tx>>), except
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that <<0x>> appears even for the NULL pointer.
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o m
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Prints the output of <<strerror(errno)>>; no
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argument is required. A GNU extension.
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o-
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O-
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<<_wprintf_r>>, <<_fwprintf_r>>, <<_swprintf_r>>, are simply
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reentrant versions of the functions above.
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RETURNS
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On success, <<swprintf>> return the number of wide characters in
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the output string, except the concluding <<NUL>> is not counted.
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<<wprintf>> and <<fwprintf>> return the number of characters transmitted.
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If an error occurs, the result of <<wprintf>>, <<fwprintf>>, and
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<<swprintf>> is a negative value. For <<wprintf>> and <<fwprintf>>,
|
|
<<errno>> may be set according to <<fputwc>>. For <<swprintf>>, <<errno>>
|
|
may be set to EOVERFLOW if <[size]> is greater than INT_MAX / sizeof (wchar_t),
|
|
or when the output does not fit into <[size]> wide characters (including the
|
|
terminating wide <<NULL>>).
|
|
|
|
BUGS
|
|
The ``''' (quote) flag does not work when locale's thousands_sep is not empty.
|
|
|
|
PORTABILITY
|
|
POSIX-1.2008 with extensions; C99 (compliant except for POSIX extensions).
|
|
|
|
Depending on how newlib was configured, not all format specifiers are
|
|
supported.
|
|
|
|
Supporting OS subroutines required: <<close>>, <<fstat>>, <<isatty>>,
|
|
<<lseek>>, <<read>>, <<sbrk>>, <<write>>.
|
|
*/
|
|
|
|
|
|
#include <_ansi.h>
|
|
#include <reent.h>
|
|
#include <stdio.h>
|
|
#include <wchar.h>
|
|
#include <stdarg.h>
|
|
#include <limits.h>
|
|
#include <errno.h>
|
|
#include "local.h"
|
|
|
|
/* NOTE: _swprintf_r() should be identical to swprintf() except for the
|
|
* former having ptr as a parameter and the latter needing to declare it as
|
|
* a variable set to _REENT. */
|
|
|
|
int
|
|
_swprintf_r (struct _reent *ptr,
|
|
wchar_t *str,
|
|
size_t size,
|
|
const wchar_t *fmt, ...)
|
|
{
|
|
int ret;
|
|
va_list ap;
|
|
FILE f;
|
|
|
|
if (size > INT_MAX / sizeof (wchar_t))
|
|
{
|
|
ptr->_errno = EOVERFLOW; /* POSIX extension */
|
|
return EOF;
|
|
}
|
|
f._flags = __SWR | __SSTR;
|
|
f._bf._base = f._p = (unsigned char *) str;
|
|
f._bf._size = f._w = (size > 0 ? (size - 1) * sizeof (wchar_t) : 0);
|
|
f._file = -1; /* No file. */
|
|
va_start (ap, fmt);
|
|
ret = _svfwprintf_r (ptr, &f, fmt, ap);
|
|
va_end (ap);
|
|
/* _svfwprintf_r() does not put in a terminating NUL, so add one if
|
|
* appropriate, which is whenever size is > 0. _svfwprintf_r() stops
|
|
* after n-1, so always just put at the end. */
|
|
if (size > 0) {
|
|
*(wchar_t *)f._p = L'\0'; /* terminate the string */
|
|
}
|
|
if(ret >= size) {
|
|
/* _svfwprintf_r() returns how many wide characters it would have printed
|
|
* if there were enough space. Return an error if too big to fit in str,
|
|
* unlike snprintf, which returns the size needed. */
|
|
ptr->_errno = EOVERFLOW; /* POSIX extension */
|
|
ret = -1;
|
|
}
|
|
return (ret);
|
|
}
|
|
|
|
#ifndef _REENT_ONLY
|
|
|
|
int
|
|
swprintf (wchar_t *__restrict str,
|
|
size_t size,
|
|
const wchar_t *__restrict fmt, ...)
|
|
{
|
|
int ret;
|
|
va_list ap;
|
|
FILE f;
|
|
struct _reent *ptr = _REENT;
|
|
|
|
if (size > INT_MAX / sizeof (wchar_t))
|
|
{
|
|
ptr->_errno = EOVERFLOW; /* POSIX extension */
|
|
return EOF;
|
|
}
|
|
f._flags = __SWR | __SSTR;
|
|
f._bf._base = f._p = (unsigned char *) str;
|
|
f._bf._size = f._w = (size > 0 ? (size - 1) * sizeof (wchar_t) : 0);
|
|
f._file = -1; /* No file. */
|
|
va_start (ap, fmt);
|
|
ret = _svfwprintf_r (ptr, &f, fmt, ap);
|
|
va_end (ap);
|
|
/* _svfwprintf_r() does not put in a terminating NUL, so add one if
|
|
* appropriate, which is whenever size is > 0. _svfwprintf_r() stops
|
|
* after n-1, so always just put at the end. */
|
|
if (size > 0) {
|
|
*(wchar_t *)f._p = L'\0'; /* terminate the string */
|
|
}
|
|
if(ret >= size) {
|
|
/* _svfwprintf_r() returns how many wide characters it would have printed
|
|
* if there were enough space. Return an error if too big to fit in str,
|
|
* unlike snprintf, which returns the size needed. */
|
|
ptr->_errno = EOVERFLOW; /* POSIX extension */
|
|
ret = -1;
|
|
}
|
|
return (ret);
|
|
}
|
|
|
|
#endif
|