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authorDenys Vlasenko <vda.linux@googlemail.com>2011-09-10 22:30:56 (GMT)
committer Denys Vlasenko <vda.linux@googlemail.com>2011-09-10 22:30:56 (GMT)
commit7b46d11582047d0dd21b547ff4a913defe646d40 (patch)
treef4f6787860df6536bd1e22deba6ddec41a0e3fa1
parentd48fdde3704f453014404fca321e08238dc4acc4 (diff)
downloadbusybox-7b46d11582047d0dd21b547ff4a913defe646d40.tar.gz
busybox-7b46d11582047d0dd21b547ff4a913defe646d40.tar.bz2
awk: fix a SEGV
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
-rw-r--r--editors/awk.c71
-rwxr-xr-xtestsuite/awk.tests3
2 files changed, 65 insertions, 9 deletions
diff --git a/editors/awk.c b/editors/awk.c
index 8117cab..71abca2 100644
--- a/editors/awk.c
+++ b/editors/awk.c
@@ -25,6 +25,7 @@
* to perform debug printfs to stderr: */
#define debug_printf_walker(...) do {} while (0)
#define debug_printf_eval(...) do {} while (0)
+#define debug_printf_parse(...) do {} while (0)
#ifndef debug_printf_walker
# define debug_printf_walker(...) (fprintf(stderr, __VA_ARGS__))
@@ -32,6 +33,9 @@
#ifndef debug_printf_eval
# define debug_printf_eval(...) (fprintf(stderr, __VA_ARGS__))
#endif
+#ifndef debug_printf_parse
+# define debug_printf_parse(...) (fprintf(stderr, __VA_ARGS__))
+#endif
@@ -435,13 +439,13 @@ struct globals {
smallint nextrec;
smallint nextfile;
smallint is_f0_split;
+ smallint t_rollback;
};
struct globals2 {
uint32_t t_info; /* often used */
uint32_t t_tclass;
char *t_string;
int t_lineno;
- int t_rollback;
var *intvar[NUM_INTERNAL_VARS]; /* often used */
@@ -499,11 +503,11 @@ struct globals2 {
#define nextrec (G1.nextrec )
#define nextfile (G1.nextfile )
#define is_f0_split (G1.is_f0_split )
+#define t_rollback (G1.t_rollback )
#define t_info (G.t_info )
#define t_tclass (G.t_tclass )
#define t_string (G.t_string )
#define t_lineno (G.t_lineno )
-#define t_rollback (G.t_rollback )
#define intvar (G.intvar )
#define fsplitter (G.fsplitter )
#define rsplitter (G.rsplitter )
@@ -1011,6 +1015,7 @@ static uint32_t next_token(uint32_t expected)
if (*p == '\0') {
tc = TC_EOF;
+ debug_printf_parse("%s: token found: TC_EOF\n", __func__);
} else if (*p == '\"') {
/* it's a string */
@@ -1026,6 +1031,7 @@ static uint32_t next_token(uint32_t expected)
p++;
*s = '\0';
tc = TC_STRING;
+ debug_printf_parse("%s: token found:'%s' TC_STRING\n", __func__, t_string);
} else if ((expected & TC_REGEXP) && *p == '/') {
/* it's regexp */
@@ -1048,6 +1054,7 @@ static uint32_t next_token(uint32_t expected)
p++;
*s = '\0';
tc = TC_REGEXP;
+ debug_printf_parse("%s: token found:'%s' TC_REGEXP\n", __func__, t_string);
} else if (*p == '.' || isdigit(*p)) {
/* it's a number */
@@ -1057,6 +1064,7 @@ static uint32_t next_token(uint32_t expected)
if (*p == '.')
syntax_error(EMSG_UNEXP_TOKEN);
tc = TC_NUMBER;
+ debug_printf_parse("%s: token found:%f TC_NUMBER\n", __func__, t_double);
} else {
/* search for something known */
@@ -1079,6 +1087,7 @@ static uint32_t next_token(uint32_t expected)
) {
/* then this is what we are looking for */
t_info = *ti;
+ debug_printf_parse("%s: token found:'%.*s' t_info:%x\n", __func__, l, p, t_info);
p += l;
goto token_found;
}
@@ -1102,14 +1111,17 @@ static uint32_t next_token(uint32_t expected)
p = skip_spaces(p);
if (*p == '(') {
tc = TC_FUNCTION;
+ debug_printf_parse("%s: token found:'%s' TC_FUNCTION\n", __func__, t_string);
} else {
if (*p == '[') {
p++;
tc = TC_ARRAY;
- }
+ debug_printf_parse("%s: token found:'%s' TC_ARRAY\n", __func__, t_string);
+ } else
+ debug_printf_parse("%s: token found:'%s' TC_VARIABLE\n", __func__, t_string);
}
- token_found: ;
}
+ token_found:
g_pos = p;
/* skipping newlines in some cases */
@@ -1181,6 +1193,8 @@ static node *parse_expr(uint32_t iexp)
uint32_t tc, xtc;
var *v;
+ debug_printf_parse("%s(%x)\n", __func__, iexp);
+
sn.info = PRIMASK;
sn.r.n = glptr = NULL;
xtc = TC_OPERAND | TC_UOPPRE | TC_REGEXP | iexp;
@@ -1189,12 +1203,14 @@ static node *parse_expr(uint32_t iexp)
if (glptr && (t_info == (OC_COMPARE | VV | P(39) | 2))) {
/* input redirection (<) attached to glptr node */
+ debug_printf_parse("%s: input redir\n", __func__);
cn = glptr->l.n = new_node(OC_CONCAT | SS | P(37));
cn->a.n = glptr;
xtc = TC_OPERAND | TC_UOPPRE;
glptr = NULL;
} else if (tc & (TC_BINOP | TC_UOPPOST)) {
+ debug_printf_parse("%s: TC_BINOP | TC_UOPPOST\n", __func__);
/* for binary and postfix-unary operators, jump back over
* previous operators with higher priority */
vn = cn;
@@ -1224,6 +1240,7 @@ static node *parse_expr(uint32_t iexp)
vn->a.n = cn;
} else {
+ debug_printf_parse("%s: other\n", __func__);
/* for operands and prefix-unary operators, attach them
* to last node */
vn = cn;
@@ -1231,12 +1248,14 @@ static node *parse_expr(uint32_t iexp)
cn->a.n = vn;
xtc = TC_OPERAND | TC_UOPPRE | TC_REGEXP;
if (tc & (TC_OPERAND | TC_REGEXP)) {
+ debug_printf_parse("%s: TC_OPERAND | TC_REGEXP\n", __func__);
xtc = TC_UOPPRE | TC_UOPPOST | TC_BINOP | TC_OPERAND | iexp;
/* one should be very careful with switch on tclass -
* only simple tclasses should be used! */
switch (tc) {
case TC_VARIABLE:
case TC_ARRAY:
+ debug_printf_parse("%s: TC_VARIABLE | TC_ARRAY\n", __func__);
cn->info = OC_VAR;
v = hash_search(ahash, t_string);
if (v != NULL) {
@@ -1253,6 +1272,7 @@ static node *parse_expr(uint32_t iexp)
case TC_NUMBER:
case TC_STRING:
+ debug_printf_parse("%s: TC_NUMBER | TC_STRING\n", __func__);
cn->info = OC_VAR;
v = cn->l.v = xzalloc(sizeof(var));
if (tc & TC_NUMBER)
@@ -1262,32 +1282,41 @@ static node *parse_expr(uint32_t iexp)
break;
case TC_REGEXP:
+ debug_printf_parse("%s: TC_REGEXP\n", __func__);
mk_re_node(t_string, cn, xzalloc(sizeof(regex_t)*2));
break;
case TC_FUNCTION:
+ debug_printf_parse("%s: TC_FUNCTION\n", __func__);
cn->info = OC_FUNC;
cn->r.f = newfunc(t_string);
cn->l.n = condition();
break;
case TC_SEQSTART:
+ debug_printf_parse("%s: TC_SEQSTART\n", __func__);
cn = vn->r.n = parse_expr(TC_SEQTERM);
+ if (!cn)
+ syntax_error("Empty sequence");
cn->a.n = vn;
break;
case TC_GETLINE:
+ debug_printf_parse("%s: TC_GETLINE\n", __func__);
glptr = cn;
xtc = TC_OPERAND | TC_UOPPRE | TC_BINOP | iexp;
break;
case TC_BUILTIN:
+ debug_printf_parse("%s: TC_BUILTIN\n", __func__);
cn->l.n = condition();
break;
}
}
}
}
+
+ debug_printf_parse("%s() returns %p\n", __func__, sn.r.n);
return sn.r.n;
}
@@ -1356,18 +1385,25 @@ static void chain_group(void)
} while (c & TC_NEWLINE);
if (c & TC_GRPSTART) {
+ debug_printf_parse("%s: TC_GRPSTART\n", __func__);
while (next_token(TC_GRPSEQ | TC_GRPTERM) != TC_GRPTERM) {
+ debug_printf_parse("%s: !TC_GRPTERM\n", __func__);
if (t_tclass & TC_NEWLINE)
continue;
rollback_token();
chain_group();
}
+ debug_printf_parse("%s: TC_GRPTERM\n", __func__);
} else if (c & (TC_OPSEQ | TC_OPTERM)) {
+ debug_printf_parse("%s: TC_OPSEQ | TC_OPTERM\n", __func__);
rollback_token();
chain_expr(OC_EXEC | Vx);
- } else { /* TC_STATEMNT */
+ } else {
+ /* TC_STATEMNT */
+ debug_printf_parse("%s: TC_STATEMNT(?)\n", __func__);
switch (t_info & OPCLSMASK) {
case ST_IF:
+ debug_printf_parse("%s: ST_IF\n", __func__);
n = chain_node(OC_BR | Vx);
n->l.n = condition();
chain_group();
@@ -1382,12 +1418,14 @@ static void chain_group(void)
break;
case ST_WHILE:
+ debug_printf_parse("%s: ST_WHILE\n", __func__);
n2 = condition();
n = chain_loop(NULL);
n->l.n = n2;
break;
case ST_DO:
+ debug_printf_parse("%s: ST_DO\n", __func__);
n2 = chain_node(OC_EXEC);
n = chain_loop(NULL);
n2->a.n = n->a.n;
@@ -1396,6 +1434,7 @@ static void chain_group(void)
break;
case ST_FOR:
+ debug_printf_parse("%s: ST_FOR\n", __func__);
next_token(TC_SEQSTART);
n2 = parse_expr(TC_SEMICOL | TC_SEQTERM);
if (t_tclass & TC_SEQTERM) { /* for-in */
@@ -1421,6 +1460,7 @@ static void chain_group(void)
case OC_PRINT:
case OC_PRINTF:
+ debug_printf_parse("%s: OC_PRINT[F]\n", __func__);
n = chain_node(t_info);
n->l.n = parse_expr(TC_OPTERM | TC_OUTRDR | TC_GRPTERM);
if (t_tclass & TC_OUTRDR) {
@@ -1432,17 +1472,20 @@ static void chain_group(void)
break;
case OC_BREAK:
+ debug_printf_parse("%s: OC_BREAK\n", __func__);
n = chain_node(OC_EXEC);
n->a.n = break_ptr;
break;
case OC_CONTINUE:
+ debug_printf_parse("%s: OC_CONTINUE\n", __func__);
n = chain_node(OC_EXEC);
n->a.n = continue_ptr;
break;
/* delete, next, nextfile, return, exit */
default:
+ debug_printf_parse("%s: default\n", __func__);
chain_expr(t_info);
}
}
@@ -1460,19 +1503,24 @@ static void parse_program(char *p)
while ((tclass = next_token(TC_EOF | TC_OPSEQ | TC_GRPSTART |
TC_OPTERM | TC_BEGIN | TC_END | TC_FUNCDECL)) != TC_EOF) {
- if (tclass & TC_OPTERM)
+ if (tclass & TC_OPTERM) {
+ debug_printf_parse("%s: TC_OPTERM\n", __func__);
continue;
+ }
seq = &mainseq;
if (tclass & TC_BEGIN) {
+ debug_printf_parse("%s: TC_BEGIN\n", __func__);
seq = &beginseq;
chain_group();
} else if (tclass & TC_END) {
+ debug_printf_parse("%s: TC_END\n", __func__);
seq = &endseq;
chain_group();
} else if (tclass & TC_FUNCDECL) {
+ debug_printf_parse("%s: TC_FUNCDECL\n", __func__);
next_token(TC_FUNCTION);
g_pos++;
f = newfunc(t_string);
@@ -1490,22 +1538,27 @@ static void parse_program(char *p)
clear_array(ahash);
} else if (tclass & TC_OPSEQ) {
+ debug_printf_parse("%s: TC_OPSEQ\n", __func__);
rollback_token();
cn = chain_node(OC_TEST);
cn->l.n = parse_expr(TC_OPTERM | TC_EOF | TC_GRPSTART);
if (t_tclass & TC_GRPSTART) {
+ debug_printf_parse("%s: TC_GRPSTART\n", __func__);
rollback_token();
chain_group();
} else {
+ debug_printf_parse("%s: !TC_GRPSTART\n", __func__);
chain_node(OC_PRINT);
}
cn->r.n = mainseq.last;
} else /* if (tclass & TC_GRPSTART) */ {
+ debug_printf_parse("%s: TC_GRPSTART(?)\n", __func__);
rollback_token();
chain_group();
}
}
+ debug_printf_parse("%s: TC_EOF\n", __func__);
}
@@ -3000,7 +3053,7 @@ int awk_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int awk_main(int argc, char **argv)
{
unsigned opt;
- char *opt_F, *opt_W;
+ char *opt_F;
llist_t *list_v = NULL;
llist_t *list_f = NULL;
int i, j;
@@ -3062,7 +3115,7 @@ int awk_main(int argc, char **argv)
}
}
opt_complementary = "v::f::"; /* -v and -f can occur multiple times */
- opt = getopt32(argv, "F:v:f:W:", &opt_F, &list_v, &list_f, &opt_W);
+ opt = getopt32(argv, "F:v:f:W:", &opt_F, &list_v, &list_f, NULL);
argv += optind;
argc -= optind;
if (opt & 0x1)
@@ -3096,7 +3149,7 @@ int awk_main(int argc, char **argv)
parse_program(*argv++);
}
if (opt & 0x8) // -W
- bb_error_msg("warning: unrecognized option '-W %s' ignored", opt_W);
+ bb_error_msg("warning: option -W is ignored");
/* fill in ARGV array */
setvar_i(intvar[ARGC], argc);
diff --git a/testsuite/awk.tests b/testsuite/awk.tests
index 0afe9b9..5a32304 100755
--- a/testsuite/awk.tests
+++ b/testsuite/awk.tests
@@ -202,4 +202,7 @@ end d
" \
"" ""
+testing "awk handles empty ()" \
+ "awk 'BEGIN {print()}' 2>&1" "awk: cmd. line:1: Empty sequence\n" "" ""
+
exit $FAILCOUNT