Add form-upload example

examples/form-upload/main.c

@@ -0,0 +1,42 @@
+// Copyright (c) 2021 Cesanta Software Limited
+// All rights reserved
+
+#include "mongoose.h"
+
+// HTTP request handler function. It implements the following endpoints:
+//   /upload - prints all submitted form elements
+//   all other URI - serves web_root/ directory
+static void cb(struct mg_connection *c, int ev, void *ev_data, void *fn_data) {
+  if (ev == MG_EV_HTTP_MSG) {
+    struct mg_http_message *hm = (struct mg_http_message *) ev_data;
+    LOG(LL_INFO, ("New request to: [%.*s]", (int) hm->uri.len, hm->uri.ptr));
+    if (mg_http_match_uri(hm, "/upload")) {
+      struct mg_http_part part;
+      size_t ofs = 0;
+      while ((ofs = mg_http_next_multipart(hm->body, ofs, &part)) > 0) {
+        LOG(LL_INFO,
+            ("Name: [%.*s] Filename: [%.*s] Body: [%.*s]", (int) part.name.len,
+             part.name.ptr, (int) part.filename.len, part.filename.ptr,
+             (int) part.body.len, part.body.ptr));
+      }
+      mg_http_reply(c, 200, "", "Thank you!");
+    } else {
+      struct mg_http_serve_opts opts = {.root_dir = "web_root"};
+      mg_http_serve_dir(c, ev_data, &opts);
+    }
+  }
+}
+
+int main(void) {
+  struct mg_mgr mgr;
+  struct mg_timer t1;
+
+  mg_mgr_init(&mgr);
+  mg_log_set("3");
+  mg_http_listen(&mgr, "http://localhost:8000", cb, NULL);
+
+  for (;;) mg_mgr_poll(&mgr, 50);
+  mg_mgr_free(&mgr);
+
+  return 0;
+}