putwc(3) - f38

1fputwc(3)                  Library Functions Manual                  fputwc(3)
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NAME

6       fputwc, putwc - write a wide character to a FILE stream
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LIBRARY

9       Standard C library (libc, -lc)
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SYNOPSIS

12       #include <stdio.h>
13       #include <wchar.h>
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15       wint_t fputwc(wchar_t wc, FILE *stream);
16       wint_t putwc(wchar_t wc, FILE *stream);
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DESCRIPTION

19       The  fputwc() function is the wide-character equivalent of the fputc(3)
20       function.  It  writes  the  wide  character  wc  to  stream.   If  fer‐
21       ror(stream) becomes true, it returns WEOF.  If a wide-character conver‐
22       sion error occurs, it sets errno to EILSEQ and  returns  WEOF.   Other‐
23       wise, it returns wc.
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25       The  putwc()  function  or macro functions identically to fputwc().  It
26       may be implemented as a macro, and may evaluate its argument more  than
27       once.  There is no reason ever to use it.
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29       For nonlocking counterparts, see unlocked_stdio(3).
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RETURN VALUE

32       On success, fputwc() function returns wc.  Otherwise, WEOF is returned,
33       and errno is set to indicate the error.
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ERRORS

36       Apart from the usual ones, there is
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38       EILSEQ Conversion of wc to the stream's encoding fails.
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ATTRIBUTES

41       For an  explanation  of  the  terms  used  in  this  section,  see  at‐
42       tributes(7).
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44       ┌────────────────────────────────────────────┬───────────────┬─────────┐
45       │Interface                                   │ Attribute     │ Value   │
46       ├────────────────────────────────────────────┼───────────────┼─────────┤
47       │fputwc(), putwc()                           │ Thread safety │ MT-Safe │
48       └────────────────────────────────────────────┴───────────────┴─────────┘
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STANDARDS

51       C11, POSIX.1-2008.
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HISTORY

54       C99, POSIX.1-2001.
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NOTES

57       The  behavior  of fputwc() depends on the LC_CTYPE category of the cur‐
58       rent locale.
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60       In the absence of additional information passed to the  fopen(3)  call,
61       it is reasonable to expect that fputwc() will actually write the multi‐
62       byte sequence corresponding to the wide character wc.
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