Config parsing confused by continuations that start with quotes

(fixes issue libgit2#6089)

Signed-off-by: Sven Strickroth <email@cs-ware.de>

Author: csware

src/config_parse.c

@@ -36,7 +36,7 @@ static int strip_comments(char *line, int in_quotes)
 	char *ptr;
 
 	for (ptr = line; *ptr; ++ptr) {
-		if (ptr[0] == '"' && ptr > line && ptr[-1] != '\\')
+		if (ptr[0] == '"' && ((ptr > line && ptr[-1] != '\\') || ptr == line))
 			quote_count++;
 
 		if ((ptr[0] == ';' || ptr[0] == '#') &&

tests/config/read.c

@@ -219,6 +219,19 @@ void test_config_read__multiline_multiple_quoted_comment_chars(void)
 	git_config_free(cfg);
 }
 
+void test_config_read__multiline_multiple_quoted_quote_at_beginning_of_line(void)
+{
+	git_config* cfg;
+	cl_git_pass(git_config_open_ondisk(&cfg, cl_fixture("config/config22")));
+	cl_git_pass(git_config_get_string_buf(&buf, cfg, "alias.m"));
+	cl_assert_equal_s("cmd ;; ;; bar", buf.ptr);
+	git_buf_dispose(&buf);
+	cl_git_pass(git_config_get_string_buf(&buf, cfg, "alias.m2"));
+	cl_assert_equal_s("'; ; something '", buf.ptr);
+	git_buf_dispose(&buf);
+	git_config_free(cfg);
+}
+
 void test_config_read__header_in_last_line(void)
 {
 	git_config *cfg;

tests/resources/config/config22

@@ -0,0 +1,10 @@
+[alias]
+	m = cmd \
+";;" \
+";;" \
+bar
+	m2 = '\
+";" \
+";" \
+something \
+'