From d919888163928142efa71fec61565bd849ebb9a9 Mon Sep 17 00:00:00 2001
From: Warner Losh <imp@FreeBSD.org>
Date: Fri, 1 Nov 1996 18:46:05 +0000
Subject: [PATCH] Reviewed by:	Warner Losh <imp@village.org> Submitted by:
 Marc Slemko <marcs@znep.com> Obtained from:	OpenBSD

Add -0 for reading the results of find -0.
---
 usr.bin/xargs/xargs.1 | 11 +++++++++++
 usr.bin/xargs/xargs.c | 23 ++++++++++++++++++-----
 2 files changed, 29 insertions(+), 5 deletions(-)

diff --git a/usr.bin/xargs/xargs.1 b/usr.bin/xargs/xargs.1
index e703c43dddb9..ab1064754824 100644
--- a/usr.bin/xargs/xargs.1
+++ b/usr.bin/xargs/xargs.1
@@ -43,6 +43,7 @@
 .Nd "construct argument list(s) and execute utility"
 .Sh SYNOPSIS
 .Nm xargs
+.Op Fl 0
 .Op Fl t
 .Oo Op Fl x
 .Fl n Ar number
@@ -79,6 +80,16 @@ Any single character, including newlines, may be escaped by a backslash.
 .Pp
 The options are as follows:
 .Bl -tag -width indent
+.It Fl 0
+Changes
+.Nm xargs
+to expect NUL
+(``\\0'')
+characters as seperators, instead of spaces and newlines.
+This is expected to be used in concert with the
+.Fl print0
+function in
+.Nm find .
 .It Fl n Ar number
 Set the maximum number of arguments taken from standard input for each
 invocation of the utility.
diff --git a/usr.bin/xargs/xargs.c b/usr.bin/xargs/xargs.c
index 4d8c07159c85..91f403bc4471 100644
--- a/usr.bin/xargs/xargs.c
+++ b/usr.bin/xargs/xargs.c
@@ -55,6 +55,7 @@ static char sccsid[] = "@(#)xargs.c	8.1 (Berkeley) 6/6/93";
 #include "pathnames.h"
 
 int tflag, rval;
+int zflag;
 
 void err __P((const char *, ...));
 void run __P((char **));
@@ -89,7 +90,7 @@ main(argc, argv, env)
 		nline -= strlen(*ep++) + 1 + sizeof(*ep);
 	}
 	nflag = xflag = 0;
-	while ((ch = getopt(argc, argv, "n:s:tx")) != EOF)
+	while ((ch = getopt(argc, argv, "0n:s:tx")) != EOF)
 		switch(ch) {
 		case 'n':
 			nflag = 1;
@@ -105,6 +106,9 @@ main(argc, argv, env)
 		case 'x':
 			xflag = 1;
 			break;
+		case '0':
+			zflag = 1;
+			break;
 		case '?':
 		default:
 			usage();
@@ -178,10 +182,17 @@ main(argc, argv, env)
 		case ' ':
 		case '\t':
 			/* Quotes escape tabs and spaces. */
-			if (insingle || indouble)
+			if (insingle || indouble || zflag)
 				goto addch;
 			goto arg2;
+		case '\0':
+			if (zflag)
+				goto arg2;
+			goto addch;
 		case '\n':
+			if (zflag)
+				goto addch;
+
 			/* Empty lines are skipped. */
 			if (argp == p)
 				continue;
@@ -212,16 +223,18 @@ arg2:			*p = '\0';
 			argp = p;
 			break;
 		case '\'':
-			if (indouble)
+			if (indouble || zflag)
 				goto addch;
 			insingle = !insingle;
 			break;
 		case '"':
-			if (insingle)
+			if (insingle || zflag)
 				goto addch;
 			indouble = !indouble;
 			break;
 		case '\\':
+			if (zflag)
+				goto addch;
 			/* Backslash escapes anything, is escaped by quotes. */
 			if (!insingle && !indouble && (ch = getchar()) == EOF)
 				err("backslash at EOF");
@@ -295,7 +308,7 @@ void
 usage()
 {
 	(void)fprintf(stderr,
-"usage: xargs [-t] [-n number [-x]] [-s size] [utility [argument ...]]\n");
+"usage: xargs [-0] [-t] [-n number [-x]] [-s size] [utility [argument ...]]\n");
 	exit(1);
 }