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, in which case
buffering occurs only within calls to printf(3). This
default may be changed by setbuf(3). The standard stream
stderr is normally unbuffered; freopen (see fopen(3)) will
cause it to become buffered. When an output stream is
unbuffered information appears on the destination file or
terminal as soon as written; when it is buffered many char-
acters 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. In the
case of putw this indication is ambiguous; ferror(3) may be
used to distinguish.
PUTC(3S) PUTC(3S)
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.
Errors can occur long after the call to putc.