1PUTC(3P)                   POSIX Programmer's Manual                  PUTC(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       putc - put a byte on a stream
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SYNOPSIS

15       #include <stdio.h>
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17       int putc(int c, FILE *stream);
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DESCRIPTION

21       The putc() function shall be equivalent to fputc(), except that  if  it
22       is implemented as a macro it may evaluate stream more than once, so the
23       argument should never be an expression with side effects.
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RETURN VALUE

26       Refer to fputc().
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ERRORS

29       Refer to fputc().
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31       The following sections are informative.
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EXAMPLES

34       None.
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APPLICATION USAGE

37       Since it may be implemented as a macro, putc() may treat a stream argu‐
38       ment  with  side  effects incorrectly. In particular, putc(c,*f++) does
39       not necessarily work correctly. Therefore, use of this function is  not
40       recommended in such situations; fputc() should be used instead.
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RATIONALE

43       None.
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FUTURE DIRECTIONS

46       None.
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SEE ALSO

49       fputc(), the Base Definitions volume of IEEE Std 1003.1-2001, <stdio.h>
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52       Portions  of  this text are reprinted and reproduced in electronic form
53       from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
54       --  Portable  Operating  System  Interface (POSIX), The Open Group Base
55       Specifications Issue 6, Copyright (C) 2001-2003  by  the  Institute  of
56       Electrical  and  Electronics  Engineers, Inc and The Open Group. In the
57       event of any discrepancy between this version and the original IEEE and
58       The  Open Group Standard, the original IEEE and The Open Group Standard
59       is the referee document. The original Standard can be  obtained  online
60       at http://www.opengroup.org/unix/online.html .
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64IEEE/The Open Group                  2003                             PUTC(3P)
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