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- .th PUTCHAR III 5/10/73
- .sh NAME
- putchar, flush \*- write character
- .sh SYNOPSIS
- .ft B
- putchar(ch)
- .s3
- flush( )
- .ft R
- .sh DESCRIPTION
- .it Putchar
- writes out its argument and returns it unchanged.
- Only the low-order byte is written, and only if it is non-null.
- Unless other arrangements have been made,
- .it putchar
- writes in
- unbuffered fashion on the standard output file.
- .s3
- Associated with this routine is an external variable
- .it fout
- which has the
- structure of a buffer discussed under putc (III).
- If the file descriptor part of this structure (first word)
- is greater than 2, output via
- .it putchar
- is buffered.
- To achieve buffered output one may say, for example,
- .s3
- .nf
- fout = dup(1); or
- fout = creat(...);
- .s3
- .fi
- In such a case
- .it flush
- must be called
- before the program terminates in order to flush out
- the buffered output.
- .it Flush
- may be called at any time.
- .sh "SEE ALSO"
- putc (III)
- .sh BUGS
- The
- .it fout
- notion is kludgy.
-