diff options
| author |   otto <otto@openbsd.org> | 2005-04-14 18:19:24 +0000 |
|---|---|---|
| committer | otto <otto@openbsd.org> | 2005-04-14 18:19:24 +0000 |
| commit | 27b1581cd5888a1115b6b2b9bdfffc2858de6bbd (patch) | |
| tree | 8bd51910e92bad70c43bfa019de490b034f886ee /lib/libc/stdio | |
| parent | completely fix the diff command (diff) | |
| download | wireguard-openbsd-27b1581cd5888a1115b6b2b9bdfffc2858de6bbd.tar.xz wireguard-openbsd-27b1581cd5888a1115b6b2b9bdfffc2858de6bbd.zip | |
Explain what happens when len equals 0 for snprintf().
ok jmc@ millert@
Diffstat (limited to 'lib/libc/stdio')
| -rw-r--r-- | lib/libc/stdio/printf.3 | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/lib/libc/stdio/printf.3 b/lib/libc/stdio/printf.3 index 4931d4e3b3d..1eaf7375db4 100644 --- a/lib/libc/stdio/printf.3 +++ b/lib/libc/stdio/printf.3 @@ -1,4 +1,4 @@ -.\" $OpenBSD: printf.3,v 1.45 2005/02/25 03:12:44 cloder Exp $ +.\" $OpenBSD: printf.3,v 1.46 2005/04/14 18:19:24 otto Exp $ .\" .\" Copyright (c) 1990, 1991, 1993 .\" The Regents of the University of California. All rights reserved. @@ -165,6 +165,14 @@ if the return value is greater than or equal to the .Fa size argument, the string was too short and some of the printed characters were discarded. +If +.Fa size +is zero, +.Fa str +may be a null pointer and no characters will be written; +the number of bytes that would have been written excluding the terminating +.Ql \e0 +byte, or \-1 on error, will be returned. .Pp .Fn sprintf and |