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-'\" t
-.\" Copyright 2022 Alejandro Colomar <alx@kernel.org>
-.\" SPDX-License-Identifier: Linux-man-pages-copyleft
-.\"
-.TH scanf 3 2023-12-09 "Linux man-pages 6.7"
-.SH NAME
-scanf, fscanf, vscanf, vfscanf \- input FILE format conversion
-.SH LIBRARY
-Standard C library
-.RI ( libc ", " \-lc )
-.SH SYNOPSIS
-.nf
-.B #include <stdio.h>
-.P
-.BI "int scanf(const char *restrict " format ", ...);"
-.BI "int fscanf(FILE *restrict " stream ,
-.BI "           const char *restrict " format ", ...);"
-.P
-.B #include <stdarg.h>
-.P
-.BI "int vscanf(const char *restrict " format ", va_list " ap );
-.BI "int vfscanf(FILE *restrict " stream ,
-.BI "           const char *restrict " format ", va_list " ap );
-.fi
-.P
-.RS -4
-Feature Test Macro Requirements for glibc (see
-.BR feature_test_macros (7)):
-.RE
-.P
-.BR vscanf (),
-.BR vfscanf ():
-.nf
-    _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
-.fi
-.SH DESCRIPTION
-The
-.BR scanf ()
-family of functions scans formatted input like
-.BR sscanf (3),
-but read from a
-.IR FILE .
-It is very difficult to use these functions correctly,
-and it is preferable to read entire lines with
-.BR fgets (3)
-or
-.BR getline (3)
-and parse them later with
-.BR sscanf (3)
-or more specialized functions such as
-.BR strtol (3).
-.P
-The
-.BR scanf ()
-function reads input from the standard input stream
-.I stdin
-and
-.BR fscanf ()
-reads input from the stream pointer
-.IR stream .
-.P
-The
-.BR vfscanf ()
-function is analogous to
-.BR vfprintf (3)
-and reads input from the stream pointer
-.I stream
-using a variable argument list of pointers (see
-.BR stdarg (3).
-The
-.BR vscanf ()
-function is analogous to
-.BR vprintf (3)
-and reads from the standard input.
-.SH RETURN VALUE
-On success, these functions return the number of input items
-successfully matched and assigned;
-this can be fewer than provided for,
-or even zero, in the event of an early matching failure.
-.P
-The value
-.B EOF
-is returned if the end of input is reached before either the first
-successful conversion or a matching failure occurs.
-.B EOF
-is also returned if a read error occurs,
-in which case the error indicator for the stream (see
-.BR ferror (3))
-is set, and
-.I errno
-is set to indicate the error.
-.SH ERRORS
-.TP
-.B EAGAIN
-The file descriptor underlying
-.I stream
-is marked nonblocking, and the read operation would block.
-.TP
-.B EBADF
-The file descriptor underlying
-.I stream
-is invalid, or not open for reading.
-.TP
-.B EILSEQ
-Input byte sequence does not form a valid character.
-.TP
-.B EINTR
-The read operation was interrupted by a signal; see
-.BR signal (7).
-.TP
-.B EINVAL
-Not enough arguments; or
-.I format
-is NULL.
-.TP
-.B ENOMEM
-Out of memory.
-.SH ATTRIBUTES
-For an explanation of the terms used in this section, see
-.BR attributes (7).
-.TS
-allbox;
-lbx lb lb
-l l l.
-Interface	Attribute	Value
-T{
-.na
-.nh
-.BR scanf (),
-.BR fscanf (),
-.BR vscanf (),
-.BR vfscanf ()
-T}	Thread safety	MT-Safe locale
-.TE
-.SH STANDARDS
-C11, POSIX.1-2008.
-.SH HISTORY
-C99, POSIX.1-2001.
-.SH CAVEATS
-These functions make it difficult to
-distinguish newlines from other white space,
-This is especially problematic with line-buffered input,
-like the standard input stream.
-.P
-These functions can't report errors after the last
-non-suppressed conversion specification.
-.SH BUGS
-It is impossible to accurately know
-how many characters these functions have consumed from the input stream,
-since they only report the number of successful conversions.
-For example,
-if the input is "123\en\ a",
-.I scanf(\[dq]%d\ %d\[dq], &a, &b)
-will consume the digits, the newline, and the space, but not the letter a.
-This makes it difficult to recover from invalid input.
-.SH SEE ALSO
-.BR fgets (3),
-.BR getline (3),
-.BR sscanf (3)