Add mg_http_next_multipart()

test/unit_test.c

@@ -1258,9 +1258,37 @@ static void test_http_chunked(void) {
   ASSERT(mgr.conns == NULL);
 }
 
+static void test_multipart(void) {
+  struct mg_http_part part;
+  size_t ofs;
+  const char *s =
+      "--xyz\r\n"
+      "Content-Disposition: form-data; name=\"val\"\r\n"
+      "\r\n"
+      "abcdef\r\n"
+      "--xyz\r\n"
+      "Content-Disposition: form-data; name=\"foo\"; filename=\"a.txt\"\r\n"
+      "Content-Type: text/plain\r\n"
+      "\r\n"
+      "hello world\r\n"
+      "\r\n"
+      "--xyz--\r\n";
+  ASSERT(mg_http_next_multipart(mg_str(""), 0, NULL) == 0);
+  ASSERT((ofs = mg_http_next_multipart(mg_str(s), 0, &part)) >= 0);
+  ASSERT(mg_strcmp(part.name, mg_str("val")) == 0);
+  ASSERT(mg_strcmp(part.body, mg_str("abcdef")) == 0);
+  ASSERT(part.filename.len == 0);
+  ASSERT((ofs = mg_http_next_multipart(mg_str(s), ofs, &part)) >= 0);
+  ASSERT(mg_strcmp(part.name, mg_str("foo")) == 0);
+  ASSERT(mg_strcmp(part.filename, mg_str("a.txt")) == 0);
+  ASSERT(mg_strcmp(part.body, mg_str("hello world")) == 0);
+  ASSERT(mg_http_next_multipart(mg_str(s), ofs, &part) == 0);
+}
+
 int main(void) {
   mg_log_set("3");
   test_crc32();
+  test_multipart();
   test_http_chunked();
   test_http_parse();
   test_util();