getwc(3) - f35

1FGETWC(3)                  Linux Programmer's Manual                 FGETWC(3)
2
3
4

NAME

6       fgetwc, getwc - read a wide character from a FILE stream
7

SYNOPSIS

9       #include <stdio.h>
10       #include <wchar.h>
11
12       wint_t fgetwc(FILE *stream);
13       wint_t getwc(FILE *stream);
14

DESCRIPTION

16       The  fgetwc() function is the wide-character equivalent of the fgetc(3)
17       function.  It reads a wide character from stream and  returns  it.   If
18       the end of stream is reached, or if ferror(stream) becomes true, it re‐
19       turns WEOF.  If a wide-character conversion error occurs, it sets errno
20       to EILSEQ and returns WEOF.
21
22       The  getwc()  function  or macro functions identically to fgetwc().  It
23       may be implemented as a macro, and may evaluate its argument more  than
24       once.  There is no reason ever to use it.
25
26       For nonlocking counterparts, see unlocked_stdio(3).
27

RETURN VALUE

29       On  success,  fgetwc() returns the next wide-character from the stream.
30       Otherwise, WEOF is returned, and errno is set to indicate the error.
31

ERRORS

33       Apart from the usual ones, there is
34
35       EILSEQ The data obtained from the input stream does not  form  a  valid
36              character.
37

ATTRIBUTES

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

CONFORMING TO

49       POSIX.1-2001, POSIX.1-2008, C99.
50

NOTES

52       The behavior of fgetwc() depends on the LC_CTYPE category of  the  cur‐
53       rent locale.
54
55       In  the  absence of additional information passed to the fopen(3) call,
56       it is reasonable to expect that fgetwc() will actually read a multibyte
57       sequence from the stream and then convert it to a wide character.
58

COLOPHON

63       This  page  is  part of release 5.12 of the Linux man-pages project.  A
64       description of the project, information about reporting bugs,  and  the
65       latest     version     of     this    page,    can    be    found    at
66       https://www.kernel.org/doc/man-pages/.
67
68
69
70GNU                               2021-03-22                         FGETWC(3)