fgetc man page on Archlinux

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FGETC(3P)		   POSIX Programmer's Manual		     FGETC(3P)

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

       fgetc — get a byte from a stream

       #include <stdio.h>

       int fgetc(FILE *stream);

       The functionality described on this reference page is aligned with  the
       ISO C  standard.	 Any  conflict between the requirements described here
       and the ISO C standard is unintentional. This  volume  of  POSIX.1‐2008
       defers to the ISO C standard.

       If  the end-of-file indicator for the input stream pointed to by stream
       is not set and a next byte  is  present,	 the  fgetc()  function	 shall
       obtain  the next byte as an unsigned char converted to an int, from the
       input stream pointed to by stream,  and	advance	 the  associated  file
       position	 indicator for the stream (if defined). Since fgetc() operates
       on bytes, reading a character consisting	 of  multiple  bytes  (or  ``a
       multi-byte character'') may require multiple calls to fgetc().

       The  fgetc()  function  may  mark the last data access timestamp of the
       file associated with stream for update. The last data access  timestamp
       shall  be  marked  for  update  by  the	first  successful execution of
       fgetc(), fgets(), fread(),  fscanf(),  getc(),  getchar(),  getdelim(),
       getline(),  gets(),  or scanf() using stream that returns data not sup‐
       plied by a prior call to ungetc().

       Upon successful completion, fgetc() shall return the next byte from the
       input  stream  pointed  to by stream.  If the end-of-file indicator for
       the stream is set, or if the stream is at end-of-file, the  end-of-file
       indicator  for the stream shall be set and fgetc() shall return EOF. If
       a read error occurs, the error indicator for the stream shall  be  set,
       fgetc() shall return EOF, and shall set errno to indicate the error.

       The fgetc() function shall fail if data needs to be read and:

       EAGAIN The  O_NONBLOCK  flag  is set for the file descriptor underlying
	      stream and the thread would be delayed in the fgetc() operation.

       EBADF  The file descriptor  underlying  stream  is  not	a  valid  file
	      descriptor open for reading.

       EINTR  The  read	 operation was terminated due to the receipt of a sig‐
	      nal, and no data was transferred.

       EIO    A physical I/O error has occurred, or the process is in a	 back‐
	      ground  process  group  attempting  to read from its controlling
	      terminal, and either the calling thread is blocking  SIGTTIN  or
	      the  process  is	ignoring  SIGTTIN  or the process group of the
	      process is orphaned.  This  error	 may  also  be	generated  for
	      implementation-defined reasons.

	      The file is a regular file and an attempt was made to read at or
	      beyond the offset	 maximum  associated  with  the	 corresponding

       The fgetc() function may fail if:

       ENOMEM Insufficient storage space is available.

       ENXIO  A	 request  was made of a nonexistent device, or the request was
	      outside the capabilities of the device.

       The following sections are informative.


       If the integer value returned by fgetc() is stored into a  variable  of
       type  char and then compared against the integer constant EOF, the com‐
       parison may never succeed, because sign-extension of a variable of type
       char on widening to integer is implementation-defined.

       The ferror() or feof() functions must be used to distinguish between an
       error condition and an end-of-file condition.



       Section 2.5, Standard I/O Streams, feof(), ferror(), fgets(),  fread(),
       fscanf(), getchar(), getc(), gets(), ungetc()

       The Base Definitions volume of POSIX.1‐2008, <stdio.h>

       Portions	 of  this text are reprinted and reproduced in electronic form
       from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
       --  Portable  Operating	System	Interface (POSIX), The Open Group Base
       Specifications Issue 7, Copyright (C) 2013 by the Institute of Electri‐
       cal  and	 Electronics  Engineers,  Inc  and  The	 Open Group.  (This is
       POSIX.1-2008 with the 2013 Technical Corrigendum	 1  applied.)  In  the
       event of any discrepancy between this version and the original IEEE and
       The Open Group Standard, the original IEEE and The Open Group  Standard
       is  the	referee document. The original Standard can be obtained online
       at http://www.unix.org/online.html .

       Any typographical or formatting errors that appear  in  this  page  are
       most likely to have been introduced during the conversion of the source
       files to man page format. To report such errors,	 see  https://www.ker‐
       nel.org/doc/man-pages/reporting_bugs.html .

IEEE/The Open Group		     2013			     FGETC(3P)

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