awk: disallow "str"++, closes bug 12981
function old new delta parse_expr 887 896 +9 Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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@ -1359,8 +1359,10 @@ static node *parse_expr(uint32_t iexp)
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v = cn->l.v = xzalloc(sizeof(var));
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if (tc & TC_NUMBER)
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setvar_i(v, t_double);
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else
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else {
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setvar_s(v, t_string);
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xtc &= ~TC_UOPPOST; /* "str"++ is not allowed */
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}
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break;
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case TC_REGEXP:
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@ -390,5 +390,13 @@ testing 'awk negative field access' \
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'' \
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'anything'
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# was misinterpreted as (("str"++) i) instead of ("str" (++i))
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# (and was executed: "str"++ is "0", thus concatenating "0" and "1"):
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testing 'awk do not allow "str"++' \
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'awk -v i=1 "BEGIN {print \"str\" ++i}"' \
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"str2\n" \
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'' \
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'anything'
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exit $FAILCOUNT
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