PUTC(3)                   OpenBSD Programmer's Manual                  PUTC(3)

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

SYNOPSIS
     #include <stdio.h>

     int
     fputc(int c, FILE *stream);

     int
     putc(int c, FILE *stream);

     int
     putchar(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.

     putc() 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.

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

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

RETURN VALUES
     The functions fputc(), putc(), and putchar() return the character
     written.  If an error occurs, the value EOF is returned and the global
     variable errno is set to indicate the error.  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.  The global variable errno may be
     set to indicate the error.

ERRORS
     The function putw() may also fail and set errno for any of the errors
     specified for the routines write(2) or realloc(3).

SEE ALSO
     ferror(3), fopen(3), getc(3), stdio(3)

STANDARDS
     The functions fputc(), putc(), and putchar(), conform to ANSI X3.159-1989
     (``ANSI C'').  A function putw() function appeared in Version 6 AT&T
     UNIX.

BUGS
     Since the size and byte order of an int may vary from one machine to
     another, putw() is not recommended for portable applications.

OpenBSD 4.9                      May 31, 2007                      OpenBSD 4.9