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    Command:

    mbtowc

    
    
    

    SYNOPSIS

           #include <stdlib.h>
    
           int mbtowc(wchar_t *pwc, const char *s, size_t n);
    
    
    

    DESCRIPTION

           The  main  case  for this function is when s is not NULL and pwc is not
           NULL.  In this case, the mbtowc() function inspects at most n bytes  of
           the  multibyte  string starting at s, extracts the next complete multi-
           byte character, converts it to a wide character and stores it at  *pwc.
           It updates an internal shift state known only to the mbtowc() function.
           If s does not point to a null byte ('\0'), it  returns  the  number  of
           bytes that were consumed from s, otherwise it returns 0.
    
           If  the n bytes starting at s do not contain a complete multibyte char-
           acter, or if they  contain  an  invalid  multibyte  sequence,  mbtowc()
           returns  -1.  This can happen even if n >= MB_CUR_MAX, if the multibyte
           string contains redundant shift sequences.
    
           A different case is when s is not NULL but pwc is NULL.  In  this  case
           the  mbtowc()  function behaves as above, except that it does not store
           the converted wide character in memory.
    
           A third case is when s is NULL.  In this case, pwc and n  are  ignored.
           The  mbtowc() function resets the shift state, only known to this func-
           tion, to the initial state, and returns nonzero  if  the  encoding  has
           nontrivial shift state, or zero if the encoding is stateless.
    
    
    

    RETURN VALUE

           If  s is not NULL, the mbtowc() function returns the number of consumed
           bytes starting at s, or 0 if s points to a null byte, or -1 upon  fail-
           ure.
    
           If s is NULL, the mbtowc() function returns nonzero if the encoding has
           nontrivial shift state, or zero if the encoding is stateless.
    
    
    

    CONFORMING TO

           C99.
    
    
    

    NOTES

           The behavior of mbtowc() depends on the LC_CTYPE category of  the  cur-
           rent locale.
    
           This  function  is  not multithread safe.  The function mbrtowc(3) pro-
           vides a better interface to the same functionality.
    
    
    

    SEE ALSO

           MB_CUR_MAX(3),   mblen(3),    mbrtowc(3),    mbstowcs(3),    wctomb(3),
           wcstombs(3)
    
    
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