awk: disallow "str"++, closes bug 12981

function                                             old     new   delta
parse_expr                                           887     896      +9

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 3 insertions, 1 deletions

diff --git a/editors/awk.c b/editors/awk.c
index 70df2fdb4..f7451ae32 100644
--- a/editors/awk.c
+++ b/editors/awk.c
@@ -1359,8 +1359,10 @@ static node *parse_expr(uint32_t iexp)
                                         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: