PUTC(3) BSD Programmer's Manual PUTC(3)NAME
fputc, putc, putc_unlocked, putchar, putchar_unlocked, 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
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.
Putc() acts essentially identically to fputc().
Putchar() 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() are equivalent to putc() and
putchar() respectively except that they are not implemented in a thread-
safe manner. They are intended for use with flockfile() and
funlockfile() which provide thread-safe synchronization.
The putc_unlocked() and putchar_unlocked() are implemented as macros that
expand in-line. They may evaluate stream more than once, so arguments
given to putc_unlocked() and putchar_unlocked() should not be expressions
with potential side effects.
RETURN VALUES
The functions, fputc(), putc(), putc_unlocked(), putchar(), 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 ALSOferror(3), fopen(3), getc(3), flockfile(3), funlockfile(3),
stdio(3), pthreads(3)STANDARDS
The functions fputc(), putc(), and putchar(), conform to ANSI C
X3.159-1989 (``ANSI C '').
A function putw() function appeared in Version 6 AT&T UNIX.
The putc_unlocked and putchar_unlocked functions conform to IEEE
Std1003.1c (``POSIX'').
BUGS
The size and byte order of an int varies from one machine to another, and
putw() is not recommended for portable applications.
BSDI BSD/OS June 4, 1993 2