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wscanf (3)
  • >> wscanf (3) ( FreeBSD man: Библиотечные вызовы )
  • wscanf (3) ( POSIX man: Библиотечные вызовы )

  • BSD mandoc
     

    NAME

    
    
    wscanf
    
     
    fwscanf
    
     
    swscanf
    
     
    vwscanf
    
     
    vswscanf
    
     
    vfwscanf
    
     - wide character input format conversion
    
     
    

    LIBRARY

    Lb libc
    
     
    

    SYNOPSIS

       #include <stdio.h>
       #include <wchar.h>
    int wscanf (const wchar_t * restrict format ...);
    int fwscanf (FILE * restrict stream const wchar_t * restrict format ...);
    int swscanf (const wchar_t * restrict str const wchar_t * restrict format ...);
       #include <stdarg.h>
    int vwscanf (const wchar_t * restrict format va_list ap);
    int vswscanf (const wchar_t * restrict str const wchar_t * restrict format va_list ap);
    int vfwscanf (FILE * restrict stream const wchar_t * restrict format va_list ap);
     

    DESCRIPTION

    The wscanf ();
    family of functions scans input according to a Fa format as described below. This format may contain conversion specifiers the results from such conversions, if any, are stored through the pointer arguments. The wscanf ();
    function reads input from the standard input stream stdin fwscanf ();
    reads input from the stream pointer Fa stream , and swscanf ();
    reads its input from the wide character string pointed to by Fa str . The vfwscanf ();
    function is analogous to vfwprintf(3) and reads input from the stream pointer Fa stream using a variable argument list of pointers (see stdarg(3)). The vwscanf ();
    function scans a variable argument list from the standard input and the vswscanf ();
    function scans it from a wide character string; these are analogous to the vwprintf ();
    and vswprintf ();
    functions respectively. Each successive pointer argument must correspond properly with each successive conversion specifier (but see the * conversion below). All conversions are introduced by the % (percent sign) character. The Fa format string may also contain other characters. White space (such as blanks, tabs, or newlines) in the Fa format string match any amount of white space, including none, in the input. Everything else matches only itself. Scanning stops when an input character does not match such a format character. Scanning also stops when an input conversion cannot be made (see below).  

    CONVERSIONS

    Following the % character introducing a conversion there may be a number of flag characters, as follows:

    *
    Suppresses assignment. The conversion that follows occurs as usual, but no pointer is used; the result of the conversion is simply discarded.
    hh
    Indicates that the conversion will be one of dioux or n and the next pointer is a pointer to a Vt char (rather than Vt int ) .
    h
    Indicates that the conversion will be one of dioux or n and the next pointer is a pointer to a Vt short int (rather than Vt int ) .
    l (ell)
    Indicates that the conversion will be one of dioux or n and the next pointer is a pointer to a Vt long int (rather than Vt int ) , that the conversion will be one of a , e , f or g and the next pointer is a pointer to Vt double (rather than Vt float ) , or that the conversion will be one of c or s and the next pointer is a pointer to an array of Vt wchar_t (rather than Vt char ) .
    ll (ell ell)
    Indicates that the conversion will be one of dioux or n and the next pointer is a pointer to a Vt long long int (rather than Vt int ) .
    L
    Indicates that the conversion will be one of a , e , f or g and the next pointer is a pointer to Vt long double .
    j
    Indicates that the conversion will be one of dioux or n and the next pointer is a pointer to a Vt intmax_t (rather than Vt int ) .
    t
    Indicates that the conversion will be one of dioux or n and the next pointer is a pointer to a Vt ptrdiff_t (rather than Vt int ) .
    z
    Indicates that the conversion will be one of dioux or n and the next pointer is a pointer to a Vt size_t (rather than Vt int ) .
    q
    (deprecated.) Indicates that the conversion will be one of dioux or n and the next pointer is a pointer to a Vt long long int (rather than Vt int ) .

    In addition to these flags, there may be an optional maximum field width, expressed as a decimal integer, between the % and the conversion. If no width is given, a default of ``infinity'' is used (with one exception, below); otherwise at most this many characters are scanned in processing the conversion. Before conversion begins, most conversions skip white space; this white space is not counted against the field width.

    The following conversions are available:

    %
    Matches a literal `%' That is, ``%% '' in the format string matches a single input `%' character. No conversion is done, and assignment does not occur.
    d
    Matches an optionally signed decimal integer; the next pointer must be a pointer to Vt int .
    i
    Matches an optionally signed integer; the next pointer must be a pointer to Vt int . The integer is read in base 16 if it begins with `0x' or `0X' , in base 8 if it begins with `0' , and in base 10 otherwise. Only characters that correspond to the base are used.
    o
    Matches an octal integer; the next pointer must be a pointer to Vt unsigned int .
    u
    Matches an optionally signed decimal integer; the next pointer must be a pointer to Vt unsigned int .
    x , X
    Matches an optionally signed hexadecimal integer; the next pointer must be a pointer to Vt unsigned int .
    a , A , e , E , f , F , g , G
    Matches a floating-point number in the style of wcstod(3). The next pointer must be a pointer to Vt float (unless l or L is specified.)
    s
    Matches a sequence of non-white-space wide characters; the next pointer must be a pointer to Vt char , and the array must be large enough to accept the multibyte representation of all the sequence and the terminating NUL character. The input string stops at white space or at the maximum field width, whichever occurs first.

    If an l qualifier is present, the next pointer must be a pointer to Vt wchar_t , into which the input will be placed.

    S
    The same as ls
    c
    Matches a sequence of width count wide characters (default 1); the next pointer must be a pointer to Vt char , and there must be enough room for the multibyte representation of all the characters (no terminating NUL is added). The usual skip of leading white space is suppressed. To skip white space first, use an explicit space in the format.

    If an l qualifier is present, the next pointer must be a pointer to Vt wchar_t , into which the input will be placed.

    C
    The same as lc
    [
    Matches a nonempty sequence of characters from the specified set of accepted characters; the next pointer must be a pointer to Vt char , and there must be enough room for the multibyte representation of all the characters in the string, plus a terminating NUL character. The usual skip of leading white space is suppressed. The string is to be made up of characters in (or not in) a particular set; the set is defined by the characters between the open bracket [ character and a close bracket ] character. The set excludes those characters if the first character after the open bracket is a circumflex ^ To include a close bracket in the set, make it the first character after the open bracket or the circumflex; any other position will end the set. To include a hyphen in the set, make it the last character before the final close bracket; some implementations of wscanf ();
    use ``A-Z '' to represent the range of characters between `A' and `Z' The string ends with the appearance of a character not in the (or, with a circumflex, in) set or when the field width runs out.

    If an l qualifier is present, the next pointer must be a pointer to Vt wchar_t , into which the input will be placed.

    p
    Matches a pointer value (as printed by `%p' in wprintf(3)); the next pointer must be a pointer to Vt void .
    n
    Nothing is expected; instead, the number of characters consumed thus far from the input is stored through the next pointer, which must be a pointer to Vt int . This is not a conversion, although it can be suppressed with the * flag.

    The decimal point character is defined in the program's locale (category LC_NUMERIC )

    For backwards compatibility, a ``conversion'' of `%\0' causes an immediate return of EOF  

    RETURN VALUES

    These functions return the number of input items assigned, which can be fewer than provided for, or even zero, in the event of a matching failure. Zero indicates that, while there was input available, no conversions were assigned; typically this is due to an invalid input character, such as an alphabetic character for a `%d' conversion. The value EOF is returned if an input failure occurs before any conversion such as an end-of-file occurs. If an error or end-of-file occurs after conversion has begun, the number of conversions which were successfully completed is returned.  

    SEE ALSO

    fgetwc(3), scanf(3), wcrtomb(3), wcstod(3), wcstol(3), wcstoul(3), wprintf(3)  

    STANDARDS

    The fwscanf (,);
    wscanf (,);
    swscanf (,);
    vfwscanf (,);
    vwscanf ();
    and vswscanf ();
    functions conform to St -isoC-99 .  

    BUGS

    In addition to the bugs documented in scanf(3), wscanf ();
    does not support the ``A-Z '' notation for specifying character ranges with the character class conversion (`%[ ' )


     

    Index

    NAME
    LIBRARY
    SYNOPSIS
    DESCRIPTION
    CONVERSIONS
    RETURN VALUES
    SEE ALSO
    STANDARDS
    BUGS


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