[PATCH] options: don't error when unsetting OPTIND

[наб <nabijaczleweli@nabijaczleweli.xyz>]

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unset OPTIND ends up calling getoptsreset("") which errors out with
  sh: 1: unset: Illegal number:
or even
  sh: 1: unset: Illegal number: leweli/bin:/usr/l��

Pass the current flags to struct var->func, set the getopts optind to 1
and continue with allowing the unset.

We still forbid OPTIND=, OPTIND=-1, OPTIND=abc, &c.

Fixes: https://bugs.debian.org/985478
---
 src/exec.c    | 2 +-
 src/exec.h    | 2 +-
 src/mail.c    | 2 +-
 src/mail.h    | 2 +-
 src/options.c | 5 ++---
 src/options.h | 2 +-
 src/var.c     | 4 ++--
 src/var.h     | 2 +-
 8 files changed, 10 insertions(+), 11 deletions(-)

diff --git a/src/exec.c b/src/exec.c
index 87354d4..68fa8ab 100644
--- a/src/exec.c
+++ b/src/exec.c
@@ -565,7 +565,7 @@ hashcd(void)
  */
 
 void
-changepath(const char *newval)
+changepath(const char *newval, int unused)
 {
 	const char *new;
 	int idx;
diff --git a/src/exec.h b/src/exec.h
index 423b07e..0f74be4 100644
--- a/src/exec.h
+++ b/src/exec.h
@@ -69,7 +69,7 @@ int hashcmd(int, char **);
 void find_command(char *, struct cmdentry *, int, const char *);
 struct builtincmd *find_builtin(const char *);
 void hashcd(void);
-void changepath(const char *);
+void changepath(const char *, int);
 #ifdef notdef
 void getcmdentry(char *, struct cmdentry *);
 #endif
diff --git a/src/mail.c b/src/mail.c
index 8eacb2d..e81d2b4 100644
--- a/src/mail.c
+++ b/src/mail.c
@@ -109,7 +109,7 @@ chkmail(void)
 
 
 void
-changemail(const char *val)
+changemail(const char *val, int unused)
 {
 	changed++;
 }
diff --git a/src/mail.h b/src/mail.h
index 3c6b21d..70b54a4 100644
--- a/src/mail.h
+++ b/src/mail.h
@@ -35,4 +35,4 @@
  */
 
 void chkmail(void);
-void changemail(const char *);
+void changemail(const char *, int);
diff --git a/src/options.c b/src/options.c
index a46c23b..81f2c4b 100644
--- a/src/options.c
+++ b/src/options.c
@@ -390,10 +390,9 @@ setcmd(int argc, char **argv)
 
 
 void
-getoptsreset(value)
-	const char *value;
+getoptsreset(const char *value, int flags)
 {
-	shellparam.optind = number(value) ?: 1;
+	shellparam.optind = (flags & VUNSET) ? 1 : number(value) ?: 1;
 	shellparam.optoff = -1;
 }
 
diff --git a/src/options.h b/src/options.h
index 975fe33..10bcb88 100644
--- a/src/options.h
+++ b/src/options.h
@@ -83,4 +83,4 @@ int shiftcmd(int, char **);
 int setcmd(int, char **);
 int getoptscmd(int, char **);
 int nextopt(const char *);
-void getoptsreset(const char *);
+void getoptsreset(const char *, int);
diff --git a/src/var.c b/src/var.c
index ef9c2bd..a7d4a92 100644
--- a/src/var.c
+++ b/src/var.c
@@ -266,7 +266,7 @@ struct var *setvareq(char *s, int flags)
 			goto out;
 
 		if (vp->func && (flags & VNOFUNC) == 0)
-			(*vp->func)(strchrnul(s, '=') + 1);
+			(*vp->func)(strchrnul(s, '=') + 1, flags);
 
 		if ((vp->flags & (VTEXTFIXED|VSTACK)) == 0)
 			ckfree(vp->text);
@@ -531,7 +531,7 @@ poplocalvars(void)
 			unsetvar(vp->text);
 		} else {
 			if (vp->func)
-				(*vp->func)(strchrnul(lvp->text, '=') + 1);
+				(*vp->func)(strchrnul(lvp->text, '=') + 1, lvp->flags);
 			if ((vp->flags & (VTEXTFIXED|VSTACK)) == 0)
 				ckfree(vp->text);
 			vp->flags = lvp->flags;
diff --git a/src/var.h b/src/var.h
index aa7575a..4329e22 100644
--- a/src/var.h
+++ b/src/var.h
@@ -56,7 +56,7 @@ struct var {
 	struct var *next;		/* next entry in hash list */
 	int flags;			/* flags are defined above */
 	const char *text;		/* name=value */
-	void (*func)(const char *);
+	void (*func)(const char *, int flags);
 					/* function to be called when  */
 					/* the variable gets set/unset */
 };
-- 
2.30.2

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