putc(3s) [v7 man page]

PUTC(3S)																  PUTC(3S)

NAME

       putc, putchar, fputc, putw - put character or word on a stream

SYNOPSIS

       #include <stdio.h>

       int putc(c, stream)
       char c;
       FILE *stream;

       putchar(c)

       fputc(c, stream)
       FILE *stream;

       putw(w, stream)
       FILE *stream;

DESCRIPTION

       Putc appends the character c to the named output stream.  It returns the character written.

       Putchar(c) is defined as putc(c, stdout).

       Fputc behaves like putc, but is a genuine function rather than a macro.	It may be used to save on object text.

       Putw  appends  word (i.e.  int) w to the output stream.	It returns the word written.  Putw neither assumes nor causes special alignment in
       the file.

       The standard stream stdout is normally buffered if and only if the output does not refer to a terminal; this default may be changed by set-
       buf(3).	 The  standard	stream	stderr is by default unbuffered unconditionally, but use of freopen (see fopen(3)) will cause it to become
       buffered; setbuf, again, will set the state to whatever is desired.  When an output stream is unbuffered information appears on the  desti-
       nation  file  or  terminal  as  soon  as  written;  when  it  is buffered many characters are saved up and written as a block.  Fflush (see
       fclose(3)) may be used to force the block out early.

SEE ALSO

       fopen(3), fclose(3), getc(3), puts(3), printf(3), fread(3)

DIAGNOSTICS

       These functions return the constant EOF upon error.  Since this is a good integer, ferror(3) should be used to detect putw errors.

BUGS

       Because it is implemented as a macro, putc treats a stream argument with side effects improperly.  In particular `putc(c,  *f++);'  doesn't
       work sensibly.

																	  PUTC(3S)

PUTC(3) 						   BSD Library Functions Manual 						   PUTC(3)

NAME

     fputc, putc, putc_unlocked, putchar, putchar_unlocked, putw -- output a character or word to a stream

LIBRARY

     Standard C Library (libc, -lc)

SYNOPSIS

     #include <stdio.h>

     int
     fputc(int c, FILE *stream);

     int
     putc(int c, FILE *stream);

     int
     putc_unlocked(int c, FILE *stream);

     int
     putchar(int c);

     int
     putchar_unlocked(int c);

     int
     putw(int w, FILE *stream);

DESCRIPTION

     The fputc() function writes the character c (converted to an ``unsigned char'') to the output stream pointed to by stream.

     The putc() macro acts essentially identically to fputc(), but is a macro that expands in-line.  It may evaluate stream more than once, so
     arguments given to putc() should not be expressions with potential side effects.

     The putchar() function is identical to putc() with an output stream of stdout.

     The putw() function writes the specified int to the named output stream.

     The putc_unlocked() and putchar_unlocked() functions are equivalent to putc() and putchar() respectively, except that the caller is responsi-
     ble for locking the stream with flockfile(3) before calling them.	These functions may be used to avoid the overhead of locking the stream
     for each character, and to avoid output being interspersed from multiple threads writing to the same stream.

RETURN VALUES

     The functions, fputc(), putc(), putchar(), putc_unlocked(), and putchar_unlocked() return the character written.  If an error occurs, the
     value EOF is returned.  The putw() function returns 0 on success; EOF is returned if a write error occurs, or if an attempt is made to write
     a read-only stream.

SEE ALSO

     ferror(3), flockfile(3), fopen(3), getc(3), putwc(3), stdio(3)

STANDARDS

     The functions fputc(), putc(), and putchar(), conform to ISO/IEC 9899:1990 (``ISO C90'').	The putc_unlocked() and putchar_unlocked() func-
     tions conform to IEEE Std 1003.1-2001 (``POSIX.1'').  A function putw() function appeared in Version 6 AT&T UNIX.

BUGS

     The size and byte order of an int varies from one machine to another, and putw() is not recommended for portable applications.

BSD
								 January 10, 2003							       BSD