Subversion Repositories Kolibri OS

/*

 * Copyright (c) 1990 The Regents of the University of California.

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms are permitted

 * provided that the above copyright notice and this paragraph are

 * duplicated in all such forms and that any documentation,

 * advertising materials, and other materials related to such

 * distribution and use acknowledge that the software was developed

 * by the University of California, Berkeley.  The name of the

 * University may not be used to endorse or promote products derived

 * from this software without specific prior written permission.

 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR

 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED

 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.

 */

/*

FUNCTION

<>, <>, <>, <>, <>, <>---format output

INDEX

	fprintf

INDEX

	_fprintf_r

INDEX

	printf

INDEX

	_printf_r

INDEX

	asprintf

INDEX

	_asprintf_r

INDEX

	sprintf

INDEX

	_sprintf_r

INDEX

	snprintf

INDEX

	_snprintf_r

INDEX

	asnprintf

INDEX

	_asnprintf_r

ANSI_SYNOPSIS

        #include 

        int printf(const char *restrict <[format]>, ...);

        int fprintf(FILE *restrict <[fd]>, const char *restrict <[format]>, ...);

        int sprintf(char *restrict <[str]>, const char *restrict <[format]>, ...);

        int snprintf(char *restrict <[str]>, size_t <[size]>, const char *restrict <[format]>,

                     ...);

        int asprintf(char **restrict <[strp]>, const char *restrict <[format]>, ...);

        char *asnprintf(char *restrict <[str]>, size_t *restrict <[size]>, const char *restrict <[format]>,

                        ...);

        int _printf_r(struct _reent *<[ptr]>, const char *restrict <[format]>, ...);

        int _fprintf_r(struct _reent *<[ptr]>, FILE *restrict <[fd]>,

                       const char *restrict <[format]>, ...);

        int _sprintf_r(struct _reent *<[ptr]>, char *restrict <[str]>,

                       const char *restrict <[format]>, ...);

        int _snprintf_r(struct _reent *<[ptr]>, char *restrict <[str]>, size_t <[size]>,

                        const char *restrict <[format]>, ...);

        int _asprintf_r(struct _reent *<[ptr]>, char **restrict <[strp]>,

                        const char *restrict <[format]>, ...);

        char *_asnprintf_r(struct _reent *<[ptr]>, char *restrict <[str]>,

                           size_t *restrict <[size]>, const char *restrict <[format]>, ...);

DESCRIPTION

        <> accepts a series of arguments, applies to each a

        format specifier from <<*<[format]>>>, and writes the

        formatted data to <>, without a terminating NUL

        character.  The behavior of <> is undefined if there

        are not enough arguments for the format.  <> returns

        when it reaches the end of the format string.  If there are

        more arguments than the format requires, excess arguments are

        ignored.

        <> is like <>, except that output is directed

        to the stream <[fd]> rather than <>.

        <> is like <>, except that output is directed

        to the buffer <[str]>, and a terminating NUL is output.

        Behavior is undefined if more output is generated than the

        buffer can hold.

        <> is like <>, except that output is

        limited to at most <[size]> bytes, including the terminating

        <>.  As a special case, if <[size]> is 0, <[str]> can be

        NULL, and <> merely calculates how many bytes would

        be printed.

        <> is like <>, except that the output is

        stored in a dynamically allocated buffer, <[pstr]>, which

        should be freed later with <>.

        <> is like <>, except that the return type

        is either the original <[str]> if it was large enough, or a

        dynamically allocated string if the output exceeds *<[size]>;

        the length of the result is returned in *<[size]>.  When

        dynamic allocation occurs, the contents of the original

        <[str]> may have been modified.

        For <>, <>, and <>, the behavior

	is undefined if the output <<*<[str]>>> overlaps with one of

	the arguments.  Behavior is also undefined if the argument for

	<<%n>> within <<*<[format]>>> overlaps another argument.

        <[format]> is a pointer to a character string containing two

	types of objects: ordinary characters (other than <<%>>),

	which are copied unchanged to the output, and conversion

	specifications, each of which is introduced by <<%>>. (To

	include <<%>> in the output, use <<%%>> in the format string.)

	A conversion specification has the following form:

.       %[<[pos]>][<[flags]>][<[width]>][.<[prec]>][<[size]>]<[type]>

        The fields of the conversion specification have the following

        meanings:

        O+

	o <[pos]>

        Conversions normally consume arguments in the order that they

        are presented.  However, it is possible to consume arguments

        out of order, and reuse an argument for more than one

        conversion specification (although the behavior is undefined

        if the same argument is requested with different types), by

        specifying <[pos]>, which is a decimal integer followed by

        '$'.  The integer must be between 1 and  from

        limits.h, and if argument <<%n$>> is requested, all earlier

        arguments must be requested somewhere within <[format]>.  If

        positional parameters are used, then all conversion

        specifications except for <<%%>> must specify a position.

	This positional parameters method is a POSIX extension to the C

	standard definition for the functions.

	o <[flags]>

	<[flags]> is an optional sequence of characters which control

	output justification, numeric signs, decimal points, trailing

	zeros, and octal and hex prefixes.  The flag characters are

	minus (<<->>), plus (<<+>>), space ( ), zero (<<0>>), sharp

	(<<#>>), and quote (<<'>>).  They can appear in any

	combination, although not all flags can be used for all

	conversion specification types.

		o+

		o '

			A POSIX extension to the C standard.  However, this

			implementation presently treats it as a no-op, which

			is the default behavior for the C locale, anyway.  (If

			it did what it is supposed to, when <[type]> were <>,

			<>, <>, <>, <>, <>, or <>, the

			integer portion of the conversion would be formatted

			with thousands' grouping wide characters.)

		o -

			The result of the conversion is left

			justified, and the right is padded with

			blanks.  If you do not use this flag, the

			result is right justified, and padded on the

			left.

	        o +

			The result of a signed conversion (as

			determined by <[type]> of <>, <>, <>,

			<>, <>, <>, <>, <>, <>, or

			<>) will always begin with a plus or minus

			sign.  (If you do not use this flag, positive

			values do not begin with a plus sign.)

		o " " (space)

			If the first character of a signed conversion

		        specification is not a sign, or if a signed

		        conversion results in no characters, the

		        result will begin with a space.  If the space

		        ( ) flag and the plus (<<+>>) flag both

		        appear, the space flag is ignored.

	        o 0

			If the <[type]> character is <>, <>,

			<>, <>, <>, <>, <>, <>,

			<>, <>, <>, <>, <>, or <>:  leading

			zeros are used to pad the field width

			(following any indication of sign or base); no

			spaces are used for padding.  If the zero

			(<<0>>) and minus (<<->>) flags both appear,

			the zero (<<0>>) flag will be ignored.  For

			<>, <>, <>, <>, <>, and <>

			conversions, if a precision <[prec]> is

			specified, the zero (<<0>>) flag is ignored.

			Note that <<0>> is interpreted as a flag, not

		        as the beginning of a field width.

	        o #

			The result is to be converted to an

			alternative form, according to the <[type]>

			character:

			o+

			o o

				Increases precision to force the first

				digit of the result to be a zero.

			o x

				A non-zero result will have a <<0x>>

				prefix.

			o X

				A non-zero result will have a <<0X>>

				prefix.

			o a, A, e, E, f, or F

				The result will always contain a

			        decimal point even if no digits follow

			        the point.  (Normally, a decimal point

			        appears only if a digit follows it.)

			        Trailing zeros are removed.

			o g or G

				The result will always contain a

			        decimal point even if no digits follow

			        the point.  Trailing zeros are not

			        removed.

			o all others

				Undefined.

			o-

		o-

	o <[width]>

		<[width]> is an optional minimum field width.  You can

		either specify it directly as a decimal integer, or

		indirectly by using instead an asterisk (<<*>>), in

		which case an <> argument is used as the field

		width.  If positional arguments are used, then the

		width must also be specified positionally as <<*m$>>,

		with m as a decimal integer.  Negative field widths

		are treated as specifying the minus (<<->>) flag for

		left justfication, along with a positive field width.

		The resulting format may be wider than the specified

		width.

	o <[prec]>

		<[prec]> is an optional field; if present, it is

		introduced with `<<.>>' (a period). You can specify

		the precision either directly as a decimal integer or

		indirectly by using an asterisk (<<*>>), in which case

		an <> argument is used as the precision.  If

		positional arguments are used, then the precision must

		also be specified positionally as <<*m$>>, with m as a

		decimal integer.  Supplying a negative precision is

		equivalent to omitting the precision.  If only a

		period is specified the precision is zero. The effect

		depends on the conversion <[type]>.

		o+

		o d, i, o, u, x, or X

			Minimum number of digits to appear.  If no

			precision is given, defaults to 1.

		o a or A

			Number of digits to appear after the decimal

			point.  If no precision is given, the

			precision defaults to the minimum needed for

			an exact representation.

		o e, E, f or F

			Number of digits to appear after the decimal

			point.  If no precision is given, the

			precision defaults to 6.

		o g or G

			Maximum number of significant digits.  A

			precision of 0 is treated the same as a

			precision of 1.  If no precision is given, the

			precision defaults to 6.

		o s or S

			Maximum number of characters to print from the

			string.  If no precision is given, the entire

			string is printed.

		o all others

			undefined.

		o-

	o <[size]>

		<[size]> is an optional modifier that changes the data

		type that the corresponding argument has.  Behavior is

		unspecified if a size is given that does not match the

		<[type]>.

		o+

		o hh

			With <>, <>, <>, <>, <>, or

			<>, specifies that the argument should be

			converted to a <> or <

			char>> before printing.

			With <>, specifies that the argument is a

			pointer to a <>.

		o h

			With <>, <>, <>, <>, <>, or

			<>, specifies that the argument should be

			converted to a <> or <>

			before printing.

			With <>, specifies that the argument is a

			pointer to a <>.

		o l

			With <>, <>, <>, <>, <>, or

			<>, specifies that the argument is a

			<> or <>.

			With <>, specifies that the argument has

			type <>.

			With <>, specifies that the argument is a

			pointer to <>.

			With <>, specifies that the argument is a

			pointer to a <>.

			With <>, <>, <>, <>, <>, <>,

			<>, or <>, has no effect (because of

			vararg promotion rules, there is no need to

			distinguish between <> and <>).

		o ll

			With <>, <>, <>, <>, <>, or

			<>, specifies that the argument is a

			<> or <>.

			With <>, specifies that the argument is a

			pointer to a <>.

		o j

			With <>, <>, <>, <>, <>, or

			<>, specifies that the argument is an

			<> or <>.

			With <>, specifies that the argument is a

			pointer to an <>.

		o z

			With <>, <>, <>, <>, <>, or

			<>, specifies that the argument is a <>.

			With <>, specifies that the argument is a

			pointer to a <>.

		o t

			With <>, <>, <>, <>, <>, or

			<>, specifies that the argument is a

			<>.

			With <>, specifies that the argument is a

			pointer to a <>.

		o L

			With <>, <>, <>, <>, <>, <>,

			<>, or <>, specifies that the argument

			is a <>.

		o-

	o   <[type]>

		<[type]> specifies what kind of conversion <>

		performs.  Here is a table of these:

		o+

		o %

			Prints the percent character (<<%>>).

		o c

			Prints <[arg]> as single character.  If the

			<> size specifier is in effect, a multibyte

			character is printed.

		o C

			Short for <<%lc>>.  A POSIX extension to the C standard.

		o s

			Prints the elements of a pointer to <>

			until the precision or a null character is

			reached.  If the <> size specifier is in

			effect, the pointer is to an array of

			<>, and the string is converted to

			multibyte characters before printing.

		o S

			Short for <<%ls>>.  A POSIX extension to the C standard.

		o d or i

			Prints a signed decimal integer; takes an

			<>.  Leading zeros are inserted as

			necessary to reach the precision.  A value of 0 with

			a precision of 0 produces an empty string.

		o D

			Newlib extension, short for <<%ld>>.

		o o

			Prints an unsigned octal integer; takes an

			<>.  Leading zeros are inserted as

			necessary to reach the precision.  A value of 0 with

			a precision of 0 produces an empty string.

		o O

			Newlib extension, short for <<%lo>>.

		o u

			Prints an unsigned decimal integer; takes an

			<>.  Leading zeros are inserted as

			necessary to reach the precision.  A value of 0 with

			a precision of 0 produces an empty string.

		o U

			Newlib extension, short for <<%lu>>.

		o x

			Prints an unsigned hexadecimal integer (using

			<> as digits beyond <<9>>); takes an

			<>.  Leading zeros are inserted as

			necessary to reach the precision.  A value of 0 with

			a precision of 0 produces an empty string.

		o X

			Like <>, but uses <> as digits

			beyond <<9>>.

		o f

			Prints a signed value of the form

			<<[-]9999.9999>>, with the precision

			determining how many digits follow the decimal

			point; takes a <> (remember that

			<> promotes to <> as a vararg).

			The low order digit is rounded to even.  If

			the precision results in at most DECIMAL_DIG

			digits, the result is rounded correctly; if

			more than DECIMAL_DIG digits are printed, the

			result is only guaranteed to round back to the

			original value.

			If the value is infinite, the result is

			<>, and no zero padding is performed.  If

			the value is not a number, the result is

			<>, and no zero padding is performed.

		o F

			Like <>, but uses <> and <> for

			non-finite numbers.

		o e

			Prints a signed value of the form

			<<[-]9.9999e[+|-]999>>; takes a <>.

			The digit before the decimal point is non-zero

			if the value is non-zero.  The precision

			determines how many digits appear between

			<<.>> and <>, and the exponent always

			contains at least two digits.  The value zero

			has an exponent of zero.  If the value is not

			finite, it is printed like <>.

		o E

			Like <>, but using <> to introduce the

			exponent, and like <> for non-finite

			values.

		o g

			Prints a signed value in either <> or <>

			form, based on the given value and

			precision---an exponent less than -4 or

			greater than the precision selects the <>

			form.  Trailing zeros and the decimal point

			are printed only if necessary; takes a

			<>.

		o G

			Like <>, except use <> or <> form.

		o a

			Prints a signed value of the form

			<<[-]0x1.ffffp[+|-]9>>; takes a <>.

			The letters <> are used for digits

			beyond <<9>>.  The precision determines how

			many digits appear after the decimal point.

			The exponent contains at least one digit, and

			is a decimal value representing the power of

			2; a value of 0 has an exponent of 0.

			Non-finite values are printed like <>.

		o A

			Like <>, except uses <>, <
>, and

			<> instead of lower case.

		o n

			Takes a pointer to <>, and stores a count

			of the number of bytes written so far.  No

			output is created.

		o p

			Takes a pointer to <>, and prints it in

			an implementation-defined format.  This

			implementation is similar to <<%#tx>>), except

			that <<0x>> appears even for the NULL pointer.

		o m

			Prints the output of <>; no

			argument is required.  A GNU extension.

		o-

	O-

        <<_printf_r>>, <<_fprintf_r>>, <<_asprintf_r>>,

        <<_sprintf_r>>, <<_snprintf_r>>, <<_asnprintf_r>> are simply

        reentrant versions of the functions above.

RETURNS

On success, <> and <> return the number of bytes in

the output string, except the concluding <> is not counted.

<> returns the number of bytes that would be in the output

string, except the concluding <> is not counted.  <> and

<> return the number of characters transmitted.

<> returns the original <[str]> if there was enough room,

otherwise it returns an allocated string.

If an error occurs, the result of <>, <>,

<>, and <> is a negative value, and the result of

<> is NULL.  No error returns occur for <>.  For

<> and <>, <> may be set according to

<>.  For <> and <>, <> may be set

to ENOMEM if allocation fails, and for <>, <> may be

set to EOVERFLOW if <[size]> or the output length exceeds INT_MAX.

BUGS

The ``''' (quote) flag does not work when locale's thousands_sep is not empty.

PORTABILITY

ANSI C requires <>, <>, <>, and

<>.  <> and <> are newlib extensions.

The ANSI C standard specifies that implementations must support at

least formatted output of up to 509 characters.  This implementation

has no inherent limit.

Depending on how newlib was configured, not all format specifiers are

supported.

Supporting OS subroutines required: <>, <>, <>,

<>, <>, <>, <>.

*/

#include <_ansi.h>

#include 

#include 

#ifdef _HAVE_STDC

#include 

#else

#include 

#endif

#include 

#include "local.h"

int

#ifdef _HAVE_STDC

_DEFUN(_sprintf_r, (ptr, str, fmt),

       struct _reent *ptr _AND

       char *__restrict str          _AND

       _CONST char *__restrict fmt _DOTS)

#else

_sprintf_r(ptr, str, fmt, va_alist)

           struct _reent *ptr;

           char *__restrict str;

           _CONST char *__restrict fmt;

           va_dcl

#endif

{

  int ret;

  va_list ap;

  FILE f;

  f._flags = __SWR | __SSTR;

  f._bf._base = f._p = (unsigned char *) str;

  f._bf._size = f._w = INT_MAX;

  f._file = -1;  /* No file. */

#ifdef _HAVE_STDC

  va_start (ap, fmt);

#else

  va_start (ap);

#endif

  ret = _svfprintf_r (ptr, &f, fmt, ap);

  va_end (ap);

  *f._p = '\0';	/* terminate the string */

  return (ret);

}

#ifndef _REENT_ONLY

int

#ifdef _HAVE_STDC

_DEFUN(sprintf, (str, fmt),

       char *__restrict str _AND

       _CONST char *__restrict fmt _DOTS)

#else

sprintf(str, fmt, va_alist)

        char *str;

        _CONST char *fmt;

        va_dcl

#endif

{

  int ret;

  va_list ap;

  FILE f;

  f._flags = __SWR | __SSTR;

  f._bf._base = f._p = (unsigned char *) str;

  f._bf._size = f._w = INT_MAX;

  f._file = -1;  /* No file. */

#ifdef _HAVE_STDC

  va_start (ap, fmt);

#else

  va_start (ap);

#endif

  ret = _svfprintf_r (_REENT, &f, fmt, ap);

  va_end (ap);

  *f._p = '\0';	/* terminate the string */

  return (ret);

}

#endif