| WPRINTF(3) | Library Functions Manual | WPRINTF(3) | 
wprintf, fwprintf,
  swprintf, vwprintf,
  vfwprintf, vswprintf —
#include <stdio.h>
#include <wchar.h>
int
  
  fwprintf(FILE
    * restrict stream, const
    wchar_t * restrict format,
    ...);
int
  
  swprintf(wchar_t
    * restrict ws, size_t
    n, const wchar_t *
    restrict format,
    ...);
int
  
  wprintf(const
    wchar_t * restrict format,
    ...);
#include
    <stdarg.h>
int
  
  vfwprintf(FILE
    * restrict stream, const
    wchar_t * restrict,
    va_list ap);
int
  
  vswprintf(wchar_t
    * restrict ws, size_t
    n, const wchar_t
    *restrict format, va_list
    ap);
int
  
  vwprintf(const
    wchar_t * restrict format,
    va_list ap);
wprintf() family of functions produces output
  according to a format as described below. The
  wprintf() and vwprintf()
  functions write output to stdout, the standard output
  stream; fwprintf() and
  vfwprintf() write output to the given output
  stream; swprintf() and
  vswprintf() write to the wide-character string
  ws.
These functions write the output under the control of a format string that specifies how subsequent arguments (or arguments accessed via the variable-length argument facilities of stdarg(3)) are converted for output.
The swprintf() and
    vswprintf() functions will fail if
    n or more wide characters were requested to be
    written,
The format string is composed of zero or more directives: ordinary
    characters (not %), which are copied unchanged to
    the output stream; and conversion specifications, each of which results in
    fetching zero or more subsequent arguments. Each conversion specification is
    introduced by the % character. The arguments must
    correspond properly (after type promotion) with the conversion specifier.
    After the %, the following appear in sequence:
$, specifying the next argument to access. If this
      field is not provided, the argument following the last argument accessed
      will be used. Arguments are numbered starting at
      1. If unaccessed arguments in the format string
      are interspersed with ones that are accessed the results will be
      indeterminate.#’c, d,
          i, n,
          p, s, and
          u conversions, this option has no effect. For
          o conversions, the precision of the number is
          increased to force the first character of the output string to a zero
          (except if a zero value is printed with an explicit precision of
          zero). For x and X
          conversions, a non-zero result has the string
          ‘0x’ (or
          ‘0X’ for
          X conversions) prepended to it. For
          a, A,
          e, E,
          f, F,
          g, and G conversions,
          the result will always contain a decimal point, even if no digits
          follow it (normally, a decimal point appears in the results of those
          conversions only if a digit follows). For g
          and G conversions, trailing zeros are not
          removed from the result as they would otherwise be.0’ (zero)n,
          the converted value is padded on the left with zeros rather than
          blanks. If a precision is given with a numeric conversion
          (d, i,
          o, u,
          i, x, and
          X), the 0 flag is
          ignored.-’n
          conversions, the converted value is padded on the right with blanks,
          rather than on the left with blanks or zeros. A
          - overrides a 0 if
          both are given.a, A,
          d, e,
          E, f,
          F, g,
          G, or i).+’+ overrides a space if both are
          used.'’d,
          u, or i) or the
          integral portion of a floating point conversion
          (f or F) should be
          grouped and separated by thousands using the non-monetary separator
          returned by
          localeconv(3)..
      followed by an optional digit string. If the digit string is omitted, the
      precision is taken as zero. This gives the minimum number of digits to
      appear for d, i,
      o, u,
      x, and X conversions, the
      number of digits to appear after the decimal-point for
      a, A,
      e, E,
      f, and F conversions, the
      maximum number of significant digits for g and
      G conversions, or the maximum number of characters
      to be printed from a string for s
    conversions.d,
      i, n,
      o, u,
      x, or X conversion:
    | Modifier | d,i | o,u,x,X | n | 
| hh | signed char | unsigned char | signed char * | 
| h | short | unsigned short | short * | 
| l(ell) | long | unsigned long | long * | 
| ll(ell ell) | long long | unsigned long long | long long * | 
| j | intmax_t | uintmax_t | intmax_t * | 
| t | ptrdiff_t | (see note) | ptrdiff_t * | 
| z | (see note) | size_t | (see note) | 
| q(deprecated) | quad_t | u_quad_t | quad_t * | 
Note: the t modifier, when applied to
        a o, u,
        x, or X conversion,
        indicates that the argument is of an unsigned type equivalent in size to
        a ptrdiff_t. The z
        modifier, when applied to a d or
        i conversion, indicates that the argument is of
        a signed type equivalent in size to a size_t.
        Similarly, when applied to an n conversion, it
        indicates that the argument is a pointer to a signed type equivalent in
        size to a size_t.
The following length modifier is valid for the
        a, A,
        e, E,
        f, F,
        g, or G conversion:
| Modifier | a,A,e,E,f,F,g,G | 
| L | long double | 
The following length modifier is valid for the
        c or s conversion:
| Modifier | c | s | 
| l(ell) | wint_t | wchar_t * | 
A field width or precision, or both, may be indicated by an
    asterisk ‘*’ or an asterisk followed
    by one or more decimal digits and a
    ‘$’ instead of a digit string. In this
    case, an int argument supplies the field width or
    precision. A negative field width is treated as a left adjustment flag
    followed by a positive field width; a negative precision is treated as
    though it were missing. If a single format directive mixes positional
    (nn$) and non-positional arguments, the results are
    undefined.
The conversion specifiers and their meanings are:
diouxXd and
      i), unsigned octal (o),
      unsigned decimal (u), or unsigned hexadecimal
      (x and X) notation. The
      letters “abcdef” are used for
      x conversions; the letters
      “ABCDEF” are used for
      X conversions. The precision, if any, gives the
      minimum number of digits that must appear; if the converted value requires
      fewer digits, it is padded on the left with zeros.DOUld, lo, or
      lu respectively. These conversion characters are
      deprecated, and will eventually disappear.eE.ddd
      e±dd where there is
      one digit before the decimal-point character and the number of digits
      after it is equal to the precision; if the precision is missing, it is
      taken as 6; if the precision is zero, no decimal-point character appears.
      An E conversion uses the letter
      ‘E’ (rather than
      ‘e’) to introduce the exponent. The
      exponent always contains at least two digits; if the value is zero, the
      exponent is 00.
    For a, A,
        e, E,
        f, F,
        g, and G conversions,
        positive and negative infinity are represented as
        inf and -inf
        respectively when using the lowercase conversion character, and
        INF and -INF
        respectively when using the uppercase conversion character. Similarly,
        NaN is represented as nan when using the
        lowercase conversion, and NAN when using the
        uppercase conversion.
fF.ddd,
      where the number of digits after the decimal-point character is equal to
      the precision specification. If the precision is missing, it is taken as
      6; if the precision is explicitly zero, no decimal-point character
      appears. If a decimal point appears, at least one digit appears before
    it.gGf or e (or
      F or E for
      G conversions). The precision specifies the number
      of significant digits. If the precision is missing, 6 digits are given; if
      the precision is zero, it is treated as 1. Style e
      is used if the exponent from its conversion is less than -4 or greater
      than or equal to the precision. Trailing zeros are removed from the
      fractional part of the result; a decimal point appears only if it is
      followed by at least one digit.aA0xh.hhhp[±]d,
      where the number of digits after the hexadecimal-point character is equal
      to the precision specification. If the precision is missing, it is taken
      as enough to exactly represent the floating-point number; if the precision
      is explicitly zero, no hexadecimal-point character appears. This is an
      exact conversion of the mantissa+exponent internal floating point
      representation; the
      [-]0xh.hhh
      portion represents exactly the mantissa; only denormalized mantissas have
      a zero value to the left of the hexadecimal point. The
      p is a literal character
      ‘p’; the exponent is preceded by a
      positive or negative sign and is represented in decimal, using only enough
      characters to represent the exponent. The A
      conversion uses the prefix “0X”
      (rather than “0x”), the letters
      “ABCDEF” (rather than
      “abcdef”) to represent the hex
      digits, and the letter ‘P’ (rather
      than ‘p’) to separate the mantissa
      and exponent.Cc with the l
      (ell) modifier.cIf the l (ell) modifier is used, the
        wint_t argument is converted to a
        wchar_t and written.
Ss with the l
      (ell) modifier.sNUL character; if a precision is specified, no
      more than the number specified are written. If a precision is given, no
      null character need be present; if the precision is not specified, or is
      greater than the size of the array, the array must contain a terminating
      NUL character.
    If the l (ell) modifier is used, the
        wchar_t * argument is expected to be a pointer to
        an array of wide characters (pointer to a wide string). Each wide
        character in the string is written. Wide characters from the array are
        written up to (but not including) a terminating wide
        NUL character; if a precision is specified, no
        more than the number specified are written (including shift sequences).
        If a precision is given, no null character need be present; if the
        precision is not specified, or is greater than the number of characters
        in the string, the array must contain a terminating wide
        NUL character.
p%#x’ or
      ‘%#lx’).n%%’ is written. No argument is
      converted. The complete conversion specification is
      ‘%%’.The decimal point character is defined in the program's locale
    (category LC_NUMERIC).
In no case does a non-existent or small field width cause truncation of a numeric field; if the result of a conversion is wider than the field width, the field is expanded to contain the conversion result.
\0’ used to end output to
  strings).
wprintf(), fwprintf(),
  swprintf(), vwprintf(),
  vfwprintf() and vswprintf()
  functions conform to ISO/IEC 9899:1999
  (“ISO C99”).
| April 30, 2010 | NetBSD 9.4 |