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-rw-r--r--miscutils/bc.c43
-rwxr-xr-xtestsuite/bc.tests10
2 files changed, 45 insertions, 8 deletions
diff --git a/miscutils/bc.c b/miscutils/bc.c
index 4dc3824..a5d7a01 100644
--- a/miscutils/bc.c
+++ b/miscutils/bc.c
@@ -3018,6 +3018,29 @@ static BC_STATUS zbc_lex_next(BcLex *l)
# define zbc_lex_next(...) (zbc_lex_next(__VA_ARGS__), BC_STATUS_SUCCESS)
#endif
+static BC_STATUS zbc_lex_skip_if_at_NLINE(BcLex *l)
+{
+ if (l->t.t == BC_LEX_NLINE)
+ RETURN_STATUS(zbc_lex_next(l));
+ RETURN_STATUS(BC_STATUS_SUCCESS);
+}
+#if ERRORS_ARE_FATAL
+# define zbc_lex_skip_if_at_NLINE(...) (zbc_lex_skip_if_at_NLINE(__VA_ARGS__), BC_STATUS_SUCCESS)
+#endif
+
+static BC_STATUS zbc_lex_next_and_skip_NLINE(BcLex *l)
+{
+ BcStatus s;
+ s = zbc_lex_next(l);
+ if (s) RETURN_STATUS(s);
+ // if(cond)<newline>stmt is accepted too (but not 2+ newlines)
+ s = zbc_lex_skip_if_at_NLINE(l);
+ RETURN_STATUS(s);
+}
+#if ERRORS_ARE_FATAL
+# define zbc_lex_next_and_skip_NLINE(...) (zbc_lex_next_and_skip_NLINE(__VA_ARGS__), BC_STATUS_SUCCESS)
+#endif
+
static BC_STATUS zbc_lex_text_init(BcLex *l, const char *text)
{
l->buf = text;
@@ -4152,7 +4175,8 @@ static BC_STATUS zbc_parse_if(BcParse *p)
if (s) RETURN_STATUS(s);
if (p->l.t.t != BC_LEX_RPAREN) RETURN_STATUS(bc_error_bad_token());
- s = zbc_lex_next(&p->l);
+ // if(cond)<newline>stmt is accepted too (but not 2+ newlines)
+ s = zbc_lex_next_and_skip_NLINE(&p->l);
if (s) RETURN_STATUS(s);
bc_parse_push(p, BC_INST_JUMP_ZERO);
@@ -4216,12 +4240,15 @@ static BC_STATUS zbc_parse_while(BcParse *p)
s = zbc_parse_expr(p, BC_PARSE_REL, bc_parse_next_rel);
if (s) RETURN_STATUS(s);
if (p->l.t.t != BC_LEX_RPAREN) RETURN_STATUS(bc_error_bad_token());
- s = zbc_lex_next(&p->l);
+
+ // while(cond)<newline>stmt is accepted too
+ s = zbc_lex_next_and_skip_NLINE(&p->l);
if (s) RETURN_STATUS(s);
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);
if (s) RETURN_STATUS(s);
@@ -4321,7 +4348,9 @@ static BC_STATUS zbc_parse_for(BcParse *p)
bc_vec_push(&p->exits, &ip);
bc_vec_push(&p->func->labels, &ip.idx);
- s = zbc_lex_next(&p->l);
+
+ // for(...)<newline>stmt is accepted as well
+ s = zbc_lex_next_and_skip_NLINE(&p->l);
if (s) RETURN_STATUS(s);
s = zbc_parse_stmt(p);
@@ -4453,11 +4482,9 @@ static BC_STATUS zbc_parse_funcdef(BcParse *p)
if (p->l.t.t != BC_LEX_LBRACE)
s = bc_POSIX_requires("the left brace be on the same line as the function header");
- // Prevent "define z()<newline>" to be interpreted as function with empty stmt as body
- while (p->l.t.t == BC_LEX_NLINE) {
- s = zbc_lex_next(&p->l);
- if (s) RETURN_STATUS(s);
- }
+ // Prevent "define z()<newline>" from being interpreted as function with empty stmt as body
+ s = zbc_lex_skip_if_at_NLINE(&p->l);
+ if (s) RETURN_STATUS(s);
//TODO: GNU bc requires a {} block even if function body has single stmt, enforce this?
p->in_funcdef++; // to determine whether "return" stmt is allowed, and such
diff --git a/testsuite/bc.tests b/testsuite/bc.tests
index 093b395..95cc28d 100755
--- a/testsuite/bc.tests
+++ b/testsuite/bc.tests
@@ -56,6 +56,16 @@ testing "bc define with body on next line" \
"8\n9\n" \
"" "define w()\n{ auto z; return 8; }\nw()\n9"
+testing "bc if(cond)<NL>" \
+ "bc" \
+ "9\n" \
+ "" "if(0)\n3\n9"
+
+testing "bc while(cond)<NL>" \
+ "bc" \
+ "8\n7\n6\n5\n4\n3\n2\n1\n9\n" \
+ "" "i=9;while(--i)\ni\n9"
+
tar xJf bc_large.tar.xz
for f in bc*.bc; do