From: Ralph Campbell <ralph@ucbvax.Berkeley.EDU>
Date: Sat, 5 May 1984 04:52:37 +0000 (-0800)
Subject: don't do 1 byte writes, buffer and flush unbuffered I/O (stderr).
X-Git-Tag: BSD-4_3-Snapshot-Development~10044
X-Git-Url: https://git.subgeniuskitty.com/unix-history/.git/commitdiff_plain/96ae61b2dddadf16afa8ff7c1a1527e863e4ab05

don't do 1 byte writes, buffer and flush unbuffered I/O (stderr).

SCCS-vsn: lib/libc/stdio/fprintf.c 4.2
---

diff --git a/usr/src/lib/libc/stdio/fprintf.c b/usr/src/lib/libc/stdio/fprintf.c
index 4d2e1aff3b..54125e2894 100644
--- a/usr/src/lib/libc/stdio/fprintf.c
+++ b/usr/src/lib/libc/stdio/fprintf.c
@@ -1,10 +1,22 @@
-/* @(#)fprintf.c	4.1 (Berkeley) %G% */
+/* @(#)fprintf.c	4.2 (Berkeley) %G% */
 #include	<stdio.h>
 
 fprintf(iop, fmt, args)
 FILE *iop;
 char *fmt;
 {
-	_doprnt(fmt, &args, iop);
+	char localbuf[BUFSIZ];
+
+	if (iop->_flag & _IONBF) {
+		iop->_flag &= ~_IONBF;
+		iop->_ptr = iop->_base = localbuf;
+		iop->_bufsiz = BUFSIZ;
+		_doprnt(fmt, &args, iop);
+		fflush(iop);
+		iop->_flag |= _IONBF;
+		iop->_base = NULL;
+		iop->_bufsiz = NULL;
+	} else
+		_doprnt(fmt, &args, iop);
 	return(ferror(iop)? EOF: 0);
 }