NAME

       getc - get a byte from a stream

SYNOPSIS

       #include <stdio.h>

       int getc(FILE *stream);

DESCRIPTION

       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.

RETURN VALUE

       Refer to fgetc() .

ERRORS

       Refer to fgetc() .

       The following sections are informative.

EXAMPLES

       None.

APPLICATION USAGE

       If  the  integer  value returned by getc() is stored into a variable of type char and then
       compared against the integer constant EOF, the comparison 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 "#undef getc" in such situations;
       fgetc() could also be used.

RATIONALE

       None.

FUTURE DIRECTIONS

       None.

SEE ALSO

       fgetc() , the Base Definitions volume of IEEE Std 1003.1-2001, <stdio.h>

COPYRIGHT

       Portions of this text are reprinted and  reproduced  in  electronic  form  from  IEEE  Std
       1003.1,  2003  Edition,  Standard  for Information Technology -- Portable Operating System
       Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003  by
       the  Institute  of  Electrical  and  Electronics Engineers, Inc and The Open Group. 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.opengroup.org/unix/online.html .