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GETC(3P)		   POSIX Programmer's Manual		      GETC(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.

       getc — get a byte from a stream

       #include <stdio.h>

       int getc(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.

       The  getc()  function shall be equivalent to fgetc(), except that if it
       is implemented as a macro it may evaluate stream more than once, so the
       argument should never be an expression with side-effects.

       Refer to fgetc().

       Refer to fgetc().

       The following sections are informative.


       If  the	integer	 value returned by getc() 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.

       Since it may be implemented as a macro, getc() may treat incorrectly  a
       stream  argument	 with side-effects. In particular, getc(*f++) does not
       necessarily work as expected. Therefore, use of this function should be
       preceded	 by  "#undefgetc"  in  such  situations; fgetc() could also be



       Section 2.5, Standard I/O Streams, fgetc()

       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 .

       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‐ .

IEEE/The Open Group		     2013			      GETC(3P)

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