Add FSH (set -o sh), initialize it if we're /bin/sh, and add the first use:

don't set $_ if we're non-interactive.

5 files changed, 20 insertions, 9 deletions

diff --git a/bin/ksh/exec.c b/bin/ksh/exec.c
index 15027419bef..079ccc93940 100644
--- a/bin/ksh/exec.c
+++ b/bin/ksh/exec.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: exec.c,v 1.5 1996/11/21 07:59:28 downsj Exp $	*/
+/*	$OpenBSD: exec.c,v 1.6 1997/01/02 09:33:56 downsj Exp $	*/
 
 /*
  * execute command tree
@@ -457,13 +457,14 @@ comexec(t, tp, ap, flags)
 	int type_flags;
 	int keepasn_ok;
 	int fcflags = FC_BI|FC_FUNC|FC_PATH;
+	volatile int underscore = (!Flag(FSH) || Flag(FTALKING));
 
 	/* snag the last argument for $_ XXX not the same as at&t ksh,
 	 * which only seems to set $_ after a newline (but not in
 	 * functions/dot scripts, but in interactive and scipt) -
 	 * perhaps save last arg here and set it in shell()?.
 	 */
-	if (*(lastp = ap)) {
+	if (underscore && *(lastp = ap)) {
 		while (*++lastp)
 			;
 		setstr(typeset("_", LOCAL, 0, 0, 0), *--lastp);
@@ -698,8 +699,10 @@ comexec(t, tp, ap, flags)
 			break;
 		}
 
-		/* set $_ to program's full path */
-		setstr(typeset("_", LOCAL|EXPORT, 0, 0, 0), tp->val.s);
+		if (underscore) {
+			/* set $_ to program's full path */
+			setstr(typeset("_", LOCAL|EXPORT, 0, 0, 0), tp->val.s);
+		}
 
 		if (flags&XEXEC) {
 			j_exit();
diff --git a/bin/ksh/history.c b/bin/ksh/history.c
index 0ed6ee708f6..f29e7e7d281 100644
--- a/bin/ksh/history.c
+++ b/bin/ksh/history.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: history.c,v 1.2 1996/12/29 12:24:05 graichen Exp $	*/
+/*	$OpenBSD: history.c,v 1.3 1997/01/02 09:34:00 downsj Exp $	*/
 
 /*
  * command history
@@ -242,7 +242,8 @@ c_fc(wp)
 		return 1;
 	}
 
-	setstr(local("_", FALSE), tf->name);
+	if (!Flag(FSH) || Flag(FTALKING))
+		setstr(local("_", FALSE), tf->name);
 
 	/* XXX: source should not get trashed by this.. */
 	{
diff --git a/bin/ksh/main.c b/bin/ksh/main.c
index e8425e1fab8..a6bd9369df2 100644
--- a/bin/ksh/main.c
+++ b/bin/ksh/main.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: main.c,v 1.4 1996/11/21 07:59:33 downsj Exp $	*/
+/*	$OpenBSD: main.c,v 1.5 1997/01/02 09:34:03 downsj Exp $	*/
 
 /*
  * startup, main loop, enviroments and error handling
@@ -197,6 +197,11 @@ main(argc, argv)
 	change_flag(FPOSIX, OF_SPECIAL, 1);
 #endif /* POSIXLY_CORRECT */
 
+	/* Check to see if we're /bin/sh. */
+	if (!strcmp(&kshname[strlen(kshname) - 3], "/sh")
+	    || !strcmp(kshname, "sh") || !strcmp(kshname, "-sh"))
+		Flag(FSH) = 1;
+
 	/* import enviroment */
 	if (environ != NULL)
 		for (wp = environ; *wp != NULL; wp++)
diff --git a/bin/ksh/misc.c b/bin/ksh/misc.c
index 5108389f6bf..0d5fe74eb7b 100644
--- a/bin/ksh/misc.c
+++ b/bin/ksh/misc.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: misc.c,v 1.3 1996/12/22 02:57:49 tholo Exp $	*/
+/*	$OpenBSD: misc.c,v 1.4 1997/01/02 09:34:07 downsj Exp $	*/
 
 /*
  * Miscellaneous functions
@@ -161,6 +161,7 @@ const struct option options[] = {
 	{ "posix",	  0,		OF_ANY }, /* non-standard */
 	{ "privileged",	'p',		OF_ANY },
 	{ "restricted",	'r',	    OF_CMDLINE },
+	{ "sh",		  0,		OF_ANY }, /* non-standard */
 	{ "stdin",	's',	    OF_CMDLINE }, /* pseudo non-standard */
 	{ "trackall",	'h',		OF_ANY },
 	{ "verbose",	'v',		OF_ANY },
diff --git a/bin/ksh/sh.h b/bin/ksh/sh.h
index 9ae4ffb190c..588abd2c18e 100644
--- a/bin/ksh/sh.h
+++ b/bin/ksh/sh.h
@@ -1,4 +1,4 @@
-/*	$OpenBSD: sh.h,v 1.4 1996/12/18 18:28:37 niklas Exp $	*/
+/*	$OpenBSD: sh.h,v 1.5 1997/01/02 09:34:10 downsj Exp $	*/
 
 /*
  * Public Domain Bourne/Korn shell
@@ -472,6 +472,7 @@ enum sh_flag {
 	FPOSIX,		/* -o posix: be posixly correct */
 	FPRIVILEGED,	/* -p: use suid_profile */
 	FRESTRICTED,	/* -r: restricted shell */
+	FSH,		/* -o sh: favor sh behavour */
 	FSTDIN,		/* -s: (invocation) parse stdin */
 	FTRACKALL,	/* -h: create tracked aliases for all commands */
 	FVERBOSE,	/* -v: echo input */