awk: disallow "str"++, closes bug 12981
function old new delta
parse_expr 887 896 +9
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/editors/awk.c b/editors/awk.c
index 70df2fd..f7451ae 100644
--- a/editors/awk.c
+++ b/editors/awk.c
@@ -1359,8 +1359,10 @@
v = cn->l.v = xzalloc(sizeof(var));
if (tc & TC_NUMBER)
setvar_i(v, t_double);
- else
+ else {
setvar_s(v, t_string);
+ xtc &= ~TC_UOPPOST; /* "str"++ is not allowed */
+ }
break;
case TC_REGEXP:
diff --git a/testsuite/awk.tests b/testsuite/awk.tests
index b500829..87f6b50 100755
--- a/testsuite/awk.tests
+++ b/testsuite/awk.tests
@@ -390,5 +390,13 @@
'' \
'anything'
+# was misinterpreted as (("str"++) i) instead of ("str" (++i))
+# (and was executed: "str"++ is "0", thus concatenating "0" and "1"):
+testing 'awk do not allow "str"++' \
+ 'awk -v i=1 "BEGIN {print \"str\" ++i}"' \
+ "str2\n" \
+ '' \
+ 'anything'
+
exit $FAILCOUNT
