Add test for JSON parser mangling control characters.

GNUmakefile

@@ -144,6 +144,7 @@ REGRESS		 = regress/test-basic \
 		   regress/test-header-bad \
 		   regress/test-httpdate \
 		   regress/test-invalidate \
+		   regress/test-json-controlchars \
 		   regress/test-json-simple \
 		   regress/test-nogzip \
 		   regress/test-nullqueryval \

regress/test-json-controlchars.c

@@ -0,0 +1,99 @@
+/*	$Id$ */
+/*
+ * Copyright (c) 2018 Kristaps Dzonsons <kristaps@bsd.lv>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+#include "../config.h"
+
+#include <stdarg.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include <curl/curl.h>
+
+#include "../kcgi.h"
+#include "../kcgijson.h"
+#include "regress.h"
+
+static size_t
+bufcb(void *contents, size_t sz, size_t nm, void *dat)
+{
+	struct kcgi_buf	*buf = dat;
+
+	if (KCGI_OK != kcgi_buf_write(contents, nm * sz, buf))
+		return 0;
+	return nm * sz;
+}
+
+static int
+parent(CURL *curl)
+{
+	struct kcgi_buf	 buf;
+	int		 rc;
+
+	memset(&buf, 0, sizeof(struct kcgi_buf));
+
+	curl_easy_setopt(curl, CURLOPT_URL, 
+		"http://localhost:17123/index.json");
+	curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, bufcb);
+	curl_easy_setopt(curl, CURLOPT_WRITEDATA, &buf);
+	if (CURLE_OK != curl_easy_perform(curl))
+		return 0;
+
+	rc = 0 == strcmp(buf.buf, "{\"für\": \"für\"}");
+	free(buf.buf);
+	return rc;
+}
+
+static int
+child(void)
+{
+	struct kreq	 r;
+	struct kjsonreq	 req;
+	const char 	*page[] = { "index" };
+	int		 rc = 0;
+
+	if (KCGI_OK != khttp_parse(&r, NULL, 0, page, 1, 0))
+		return(0);
+	if (r.page)
+		goto out;
+	if (KMIME_APP_JSON != r.mime)
+		goto out;
+
+	rc = 1;
+	khttp_head(&r, kresps[KRESP_STATUS], 
+		"%s", khttps[KHTTP_200]);
+	khttp_head(&r, kresps[KRESP_CONTENT_TYPE], 
+		"%s", kmimetypes[r.mime]);
+	khttp_body(&r);
+
+	kjson_open(&req, &r);
+	kjson_obj_open(&req);
+	kjson_putstringp(&req, "für", "für");
+	kjson_obj_close(&req);
+	kjson_close(&req);
+out:
+	khttp_free(&r);
+	return(rc);
+}
+
+int
+main(int argc, char *argv[])
+{
+
+	return(regress_cgi(parent, child) ? 
+		EXIT_SUCCESS : EXIT_FAILURE);
+}