bc: allow only one <newline> between if() and stmt
Attempt to have more than one causes this error message:
$ bc -q
if (1)<cr>
<cr>
bc: no statement after 'if'
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/miscutils/bc.c b/miscutils/bc.c
index 6e39aee..ed2497c 100644
--- a/miscutils/bc.c
+++ b/miscutils/bc.c
@@ -3677,6 +3677,16 @@
# define zbc_parse_stmt(...) (zbc_parse_stmt(__VA_ARGS__), BC_STATUS_SUCCESS)
#endif
+static BC_STATUS zbc_parse_stmt_fail_if_bare_NLINE(BcParse *p, const char *after_X)
+{
+ if (p->l.t.t == BC_LEX_NLINE)
+ RETURN_STATUS(bc_error_fmt("no statement after '%s'", after_X));
+ RETURN_STATUS(zbc_parse_stmt(p));
+}
+#if ERRORS_ARE_FATAL
+# define zbc_parse_stmt_fail_if_bare_NLINE((...) (zbc_parse_stmt_fail_if_bare_NLINE((__VA_ARGS__), BC_STATUS_SUCCESS)
+#endif
+
static void bc_parse_operator(BcParse *p, BcLexType type, size_t start,
size_t *nexprs)
{
@@ -4141,7 +4151,7 @@
bc_vec_push(&p->exits, &ip);
bc_vec_push(&p->func->labels, &ip.idx);
- s = zbc_parse_stmt(p);
+ s = zbc_parse_stmt_fail_if_bare_NLINE(p, "if");
if (s) RETURN_STATUS(s);
dbg_lex("%s:%d in if after stmt: p->l.t.t:%d", __func__, __LINE__, p->l.t.t);
@@ -4220,8 +4230,7 @@
bc_parse_push(p, BC_INST_JUMP_ZERO);
bc_parse_pushIndex(p, ip.idx);
-//TODO: diagnose "while(cond)<newline><newline>"? Now it is seen as "while() with empty body"
- s = zbc_parse_stmt(p);
+ s = zbc_parse_stmt_fail_if_bare_NLINE(p, "while");
if (s) RETURN_STATUS(s);
n = *((size_t *) bc_vec_top(&p->conds));
@@ -4325,7 +4334,7 @@
s = zbc_lex_next_and_skip_NLINE(&p->l);
if (s) RETURN_STATUS(s);
- s = zbc_parse_stmt(p);
+ s = zbc_parse_stmt_fail_if_bare_NLINE(p, "for");
if (s) RETURN_STATUS(s);
n = *((size_t *) bc_vec_top(&p->conds));