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/*

 * 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>>, <<snprintf>>---format output

INDEX

        fprintf

INDEX

        printf

INDEX

        sprintf

INDEX

        snprintf

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]>, ...]);

        int snprintf(char *<[str]>, size_t <[size]>, 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]>;

        int snprintf(<[str]>, size_t <[size]>, <[format]> [, <[arg]>, ...]);

        char *<[str]>;

        size_t <[size]>;

        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>>, <<sprintf>> and <<snprintf>> 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]> and <<snprintf>> limits

        number of characters written to <[str]> to at most <[size]> (including

        terminating <<0>>).  For <<sprintf>> and <<snprintf>>, 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>>. No

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 <stdio.h>

#ifdef _HAVE_STDC

#include <stdarg.h>

#else

#include <varargs.h>

#endif

#include <limits.h>

#include <_ansi.h>

#include "local.h"

int

#ifdef _HAVE_STDC

_DEFUN (_sprintf_r, (ptr, str, fmt), struct _reent *ptr _AND char *str _AND _CONST char *fmt _DOTS)

#else

_sprintf_r (ptr, str, fmt, va_alist)

     struct _reent *ptr;

     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._data = ptr;

#ifdef _HAVE_STDC

  va_start (ap, fmt);

#else

  va_start (ap);

#endif

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

  va_end (ap);

  *f._p = 0;

  return (ret);

}

#ifndef _REENT_ONLY

int

#ifdef _HAVE_STDC

_DEFUN (sprintf, (str, fmt), char *str _AND _CONST char *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._data = _REENT;

#ifdef _HAVE_STDC

  va_start (ap, fmt);

#else

  va_start (ap);

#endif

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

  va_end (ap);

  *f._p = 0;

  return (ret);

}

#endif