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 argu-
     ments 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 responsible
     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()
     functions 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