1VFSCANF(3P)                POSIX Programmer's Manual               VFSCANF(3P)
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PROLOG

6       This  manual  page is part of the POSIX Programmer's Manual.  The Linux
7       implementation of this interface may differ (consult the  corresponding
8       Linux  manual page for details of Linux behavior), or the interface may
9       not be implemented on Linux.
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NAME

12       vfscanf, vscanf, vsscanf — format input of a stdarg argument list
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SYNOPSIS

15       #include <stdarg.h>
16       #include <stdio.h>
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18       int vfscanf(FILE *restrict stream, const char *restrict format,
19           va_list arg);
20       int vscanf(const char *restrict format, va_list arg);
21       int vsscanf(const char *restrict s, const char *restrict format,
22           va_list arg);
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DESCRIPTION

25       The functionality described on this reference page is aligned with  the
26       ISO C  standard.  Any  conflict between the requirements described here
27       and the ISO C standard is unintentional. This  volume  of  POSIX.1‐2017
28       defers to the ISO C standard.
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30       The vscanf(), vfscanf(), and vsscanf() functions shall be equivalent to
31       the scanf(), fscanf(), and  sscanf()  functions,  respectively,  except
32       that  instead of being called with a variable number of arguments, they
33       are called with an argument list as defined in the  <stdarg.h>  header.
34       These  functions  shall not invoke the va_end macro. As these functions
35       invoke the va_arg macro, the value of ap after the return  is  unspeci‐
36       fied.
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RETURN VALUE

39       Refer to fscanf().
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ERRORS

42       Refer to fscanf().
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44       The following sections are informative.
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EXAMPLES

47       None.
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APPLICATION USAGE

50       Applications using these functions should call va_end(ap) afterwards to
51       clean up.
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RATIONALE

54       None.
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FUTURE DIRECTIONS

57       None.
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SEE ALSO

60       Section 2.5, Standard I/O Streams, fscanf()
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62       The Base Definitions volume of POSIX.1‐2017, <stdarg.h>, <stdio.h>
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65       Portions of this text are reprinted and reproduced in  electronic  form
66       from  IEEE Std 1003.1-2017, Standard for Information Technology -- Por‐
67       table Operating System Interface (POSIX), The Open Group Base  Specifi‐
68       cations  Issue  7, 2018 Edition, Copyright (C) 2018 by the Institute of
69       Electrical and Electronics Engineers, Inc and The Open Group.   In  the
70       event of any discrepancy between this version and the original IEEE and
71       The Open Group Standard, the original IEEE and The Open Group  Standard
72       is  the  referee document. The original Standard can be obtained online
73       at http://www.opengroup.org/unix/online.html .
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75       Any typographical or formatting errors that appear  in  this  page  are
76       most likely to have been introduced during the conversion of the source
77       files to man page format. To report such errors,  see  https://www.ker‐
78       nel.org/doc/man-pages/reporting_bugs.html .
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82IEEE/The Open Group                  2017                          VFSCANF(3P)
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