/* SPRINTF.C

 * 

 * Portions Copyright (c) 1990-2006 Nokia Corporation and/or its subsidiary(-ies).

 * All rights reserved.

 */

/*

 * 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

        <<printf>>, <<fprintf>>, <<sprintf>>---format output

INDEX

	fprintf

INDEX

	printf

INDEX

	sprintf

ANSI_SYNOPSIS

        #include <stdio.h>

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

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

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

TRAD_SYNOPSIS

	#include <stdio.h>

	int printf(<[format]> [, <[arg]>, ...])

	char *<[format]>;

	int fprintf(<[fd]>, <[format]> [, <[arg]>, ...]);

	FILE *<[fd]>;

	char *<[format]>;

	int sprintf(<[str]>, <[format]> [, <[arg]>, ...]);

	char *<[str]>;

	char *<[format]>;

DESCRIPTION

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

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

        formatted data to <<stdout>>, terminated with a null character.

        The behavior of <<printf>> is undefined if there are not enough

        arguments for the format.

        <<printf>> returns when it reaches the end of the format string.

        If there are more arguments than the format requires, excess

        arguments are ignored.

        <<fprintf>> and <<sprintf>> are identical to <<printf>>, other than the

        destination of the formatted output: <<fprintf>> sends the

        output to a specified file <[fd]>, while <<sprintf>> stores the

        output in the specified char array <[str]>.  For <<sprintf>>,

        the behavior is also undefined if the output <<*<[str]>>>

        overlaps with one of the arguments.

        <[format]> is a pointer to a charater 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:

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

        The fields of the conversion specification have the following meanings:

        O+

	o <[flags]>

	an optional sequence of characters which control

	output justification, numeric signs, decimal points,

	trailing zeroes, and octal and hex prefixes.

	The flag characters are minus (<<->>), plus (<<+>>),

	space ( ), zero (<<0>>), and sharp (<<#>>).  They can

	appear in any combination.

	o+

    	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]>)

		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 <<d>>, <<i>>, <<o>>, <<u>>,

		<<x>>, <<X>>, <<e>>, <<E>>, <<f>>, <<g>>, or <<G>>: leading zeroes,

		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 <<d>>, <<i>>, <<o>>, <<u>>, <<x>>, and <<X>>

		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 next character:

	    o+

		    o 0

			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 e, E 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 zeroes are removed.

			o g or G

			same as <<e>> or <<E>>, but trailing zeroes

                        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 <<int>>

          argument is used as the field width.  Negative field widths

          are not supported; if you attempt to specify a negative field

          width, it is interpreted as a minus (<<->>) flag followed by a

          positive field width.

      o <[prec]>

	  an optional field; if present, it is introduced with `<<.>>'

	  (a period). This field gives the maximum number of

	  characters to print in a conversion; the minimum number of

	  digits of an integer to print, for conversions with <[type]>

	  <<d>>, <<i>>, <<o>>, <<u>>, <<x>>, and <<X>>; the maximum number of

	  significant digits, for the <<g>> and <<G>> conversions;

	  or the number of digits to print after the decimal

	  point, for <<e>>, <<E>>, and <<f>> conversions.  You can specify

	  the precision either directly as a decimal integer or

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

	  an <<int>> argument is used as the precision.  Supplying a negative

      precision is equivalent to omitting the precision.

	  If only a period is specified the precision is zero.

	  If a precision appears with any other conversion <[type]>

	  than those listed here, the behavior is undefined.

      o  <[size]>

		<<h>>, <<l>>, and <<L>> are optional size characters which

		override the default way that <<printf>> interprets the

		data type of the corresponding argument.  <<h>> forces

		the following <<d>>, <<i>>, <<o>>, <<u>>, <<x>> or <<X>> conversion

		<[type]> to apply to a <<short>> or <<unsigned short>>. <<h>> also

		forces a following <<n>> <[type]> to apply to

		a pointer to a <<short>>. Similarily, an

		<<l>> forces the following <<d>>, <<i>>, <<o>>, <<u>>,

		<<x>> or <<X>> conversion <[type]> to apply to a <<long>> or

		<<unsigned long>>.  <<l>> also forces a following <<n>> <[type]> to

		apply to a pointer to a <<long>>. If an <<h>>

		or an <<l>> appears with another conversion

		specifier, the behavior is undefined.  <<L>> forces a

		following <<e>>, <<E>>, <<f>>, <<g>> or <<G>> conversion <[type]> to

		apply to a <<long double>> argument.  If <<L>> appears with

		any other conversion <[type]>, the behavior is undefined.

     o   <[type]>

		<[type]> specifies what kind of conversion <<printf>> performs.

		Here is a table of these:

	o+

		o %

		prints the percent character (<<%>>)

		o c

		prints <[arg]> as single character

		o s

		prints characters until precision is reached or a null terminator

		is encountered; takes a string pointer

		o d

		prints a signed decimal integer; takes an <<int>> (same as <<i>>)

		o i

		prints a signed decimal integer; takes an <<int>> (same as <<d>>)

		o o

		prints a signed octal integer; takes an <<int>>

		o u

		prints an unsigned decimal integer; takes an <<int>>

		o x

		prints an unsigned hexadecimal integer (using <<abcdef>> as

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

		o X

		prints an unsigned hexadecimal integer (using <<ABCDEF>> as

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

		o f

		prints a signed value of the form <<[-]9999.9999>>; takes

		a floating point number

		o e

		prints a signed	value of the form <<[-]9.9999e[+|-]999>>; takes a

		floating point number

		o E

		prints the same way as <<e>>, but using <<E>> to introduce the

		exponent; takes a floating point number

		o g

		prints a signed value in either <<f>> or <<e>> form, based on given

		value and precision---trailing zeros and the decimal point are

		printed only if necessary; takes a floating point number

		o G

		prints the same way as <<g>>, but using <<E>> for the exponent if an

		exponent is needed; takes a floating point number

		o n

		stores (in the same object) a count of the characters written;

		takes a pointer to <<int>>

		o p

		prints a pointer in an implementation-defined format.

		This implementation treats the pointer as an

		<<unsigned long>> (same as <<Lu>>).

	o-

O-

RETURNS

<<sprintf>> returns the number of bytes in the output string,

save that the concluding <<NULL>> is not counted.

<<printf>> and <<fprintf>> return the number of characters transmitted.

If an error occurs, <<printf>> and <<fprintf>> return <<EOF>>. 

Error returns occur for <<sprintf>>.

PORTABILITY

        The  ANSI C standard specifies that implementations must

        support at least formatted output of up to 509 characters.

Supporting OS subroutines required: <<close>>, <<fstat>>, <<isatty>>,

<<lseek>>, <<read>>, <<sbrk>>, <<write>>.

*/

#include <_ansi.h>

#include <stdio_r.h>

#include <stdarg.h>

#include <limits.h>

#include "LOCAL.H"

/**

A reentrant version of sprintf().

*/

EXPORT_C int _sprintf_r (struct _reent *ptr, char *str, const char *fmt, ...)

{

  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._data = ptr;

  va_start (ap, fmt);

  ret = vfprintf (&f, fmt, ap);

  va_end (ap);

  *f._p = 0;

  return (ret);

}

#ifndef _REENT_ONLY

/**

Print formatted data to a string.

Writes a sequence of arguments to the given buffer formatted as the format argument specifies.

@param str Buffer where to store the resulting formatted string. 

@param fmt String that contains the text to be printed.

@return	On Success, the total number of characters printed is returned.

		On Failure, a negative number is returned.

*/

EXPORT_C int sprintf (char *str, const char *fmt, ...)

{

  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._data = _REENT2;

  if (!f._data)

 	 return EOF; // Memory for library globals is not allocated (errno not set).

  va_start (ap, fmt);

  ret = vfprintf (&f, fmt, ap);

  va_end (ap);

  *f._p = 0;

  return (ret);

}

/**

@param str Buffer where to store the resulting formatted string. 

@param fmt String that contains the text to be printed.

@param ap

@return	On Success, the total number of characters printed is returned.

		On Failure, a negative number is returned.

*/

EXPORT_C int vsprintf (char *str,char const *fmt, va_list ap)

{

  int ret;

  FILE f;

  f._flags = __SWR | __SSTR;

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

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

  f._data = _REENT2;

  if (!f._data)

 	 return EOF; // Memory for library globals is not allocated (errno not set).

  ret = vfprintf (&f, fmt, ap);

  *f._p = 0;

  return ret;

}

#endif