6f7a00964
Denys Vlasenko
2020-06-09
Subject
awk: disallow "str"++, closes bug 12981
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editors/awk.c+3 -1
| @@ -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: | |
testsuite/awk.tests+8 -0
| @@ -390,5 +390,13 @@ testing 'awk negative field access' \ | |
| '' \ | |
| '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 | |