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PUTC(3)

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NAME    [Toc]    [Back]

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

LIBRARY    [Toc]    [Back]

     Standard C Library (libc, -lc)

SYNOPSIS    [Toc]    [Back]

     #include <stdio.h>

     int
     fputc(int c, FILE *stream);

     int
     putc(int c, FILE *stream);

     int
     putchar(int c);

     int
     putc_unlocked(int c, FILE *stream);

     int
     putchar_unlocked(int c);

     int
     putw(int w, FILE *stream);

DESCRIPTION    [Toc]    [Back]

     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 putc_unlocked() and putchar_unlocked() functions provide functionality
 identical to that of putc() and putchar(), respectively, but do not
     perform implicit locking of the streams they operate on.  In multithreaded
 programs they may be used only within a scope in which the
     stream has been successfully locked by the calling thread using either
     flockfile(3) or ftrylockfile(3), and may later be released using
     funlockfile(3).

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

RETURN VALUES    [Toc]    [Back]

     The functions, fputc(), putc() and putchar() 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 ALSO    [Toc]    [Back]

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

STANDARDS    [Toc]    [Back]

     The functions fputc(), putc(), and putchar(), conform to ANSI X3.159-1989
     (``ANSI C'').  The functions putc_unlocked() and putchar_unlocked() conform
 to ISO/IEC 9945-1:1996 (``POSIX.1'').  A function putw() function
     appeared in Version 6 AT&T UNIX.

BUGS    [Toc]    [Back]

     The size and byte order of an int varies from one machine to another, and
     putw() is not recommended for portable applications.

BSD                             April 25, 2001                             BSD
[ Back ]
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