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

NAME

fputc, putc, putchar, putwoutput 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 C89”).

HISTORY

The putc() and putw() functions first appeared in Version 1 AT&T UNIX; putchar() in Version 2 AT&T UNIX; and fputc() in Version 7 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.
July 18, 2013 OpenBSD 5.6