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| author | Brian Foley <bpfoley@google.com> | 2019-01-06 18:32:59 -0800 |
|---|---|---|
| committer | Denys Vlasenko <vda.linux@googlemail.com> | 2019-01-21 12:59:19 +0100 |
| commit | 1c42c18e9601ee1416d61663f5a91874954c524d (patch) | |
| tree | 3ee100f9d73c739daa1effca974666a52d81c271 /editors | |
| parent | 08a514c097f1451678940a3178a9565b9d65a193 (diff) | |
| download | busybox-1c42c18e9601ee1416d61663f5a91874954c524d.tar.gz | |
awk: Fix overly permissive func arg list parsing
It allows things like 'func f(a b)' and 'func f(a,)' which GNU awk forbids.
function old new delta
parse_program 327 367 +40
chain_expr 40 67 +27
parse_expr 891 915 +24
EMSG_TOO_FEW_ARGS 30 18 -12
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 3/1 up/down: 91/-12) Total: 79 bytes
Signed-off-by: Brian Foley <bpfoley@google.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Diffstat (limited to 'editors')
| -rw-r--r-- | editors/awk.c | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/editors/awk.c b/editors/awk.c index 90edec82c..d25508e5d 100644 --- a/editors/awk.c +++ b/editors/awk.c @@ -1613,12 +1613,25 @@ static void parse_program(char *p) f = newfunc(t_string); f->body.first = NULL; f->nargs = 0; - while (next_token(TC_VARIABLE | TC_SEQTERM) & TC_VARIABLE) { + /* Match func arg list: a comma sep list of >= 0 args, and a close paren */ + while (next_token(TC_VARIABLE | TC_SEQTERM | TC_COMMA)) { + /* Either an empty arg list, or trailing comma from prev iter + * must be followed by an arg */ + if (f->nargs == 0 && t_tclass == TC_SEQTERM) + break; + + /* TC_SEQSTART/TC_COMMA must be followed by TC_VARIABLE */ + if (t_tclass != TC_VARIABLE) + syntax_error(EMSG_UNEXP_TOKEN); + v = findvar(ahash, t_string); v->x.aidx = f->nargs++; + /* Arg followed either by end of arg list or 1 comma */ if (next_token(TC_COMMA | TC_SEQTERM) & TC_SEQTERM) break; + if (t_tclass != TC_COMMA) + syntax_error(EMSG_UNEXP_TOKEN); } seq = &f->body; chain_group(); |