sh: Use stalloc for arith variable names.

This is simpler than the custom memory tracker I added earlier, and is also
needed by the dash arith code I plan to import.

1 files changed, 4 insertions, 0 deletions

diff --git a/bin/sh/arith.y b/bin/sh/arith.y
index 5db1633..28046ba 100644
--- a/bin/sh/arith.y
+++ b/bin/sh/arith.y
@@ -287,7 +287,9 @@ arith_t
 arith(const char *s)
 {
 	arith_t result;
+	struct stackmark smark;
 
+	setstackmark(&smark);
 	arith_buf = arith_startbuf = s;
 
 	INTOFF;
@@ -295,6 +297,8 @@ arith(const char *s)
 	arith_lex_reset();	/* Reprime lex. */
 	INTON;
 
+	popstackmark(&smark);
+
 	return result;
 }