putc



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 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.

OpenBSD 5.4                      July 18, 2013                     OpenBSD 5.4

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