Update networking layer w/ CURL and emscripten impl

External/curl-8.17.0/docs/libcurl/opts/CURLOPT_FNMATCH_DATA.md

@@ -0,0 +1,82 @@
+---
+c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
+SPDX-License-Identifier: curl
+Title: CURLOPT_FNMATCH_DATA
+Section: 3
+Source: libcurl
+See-also:
+  - CURLOPT_FNMATCH_FUNCTION (3)
+  - CURLOPT_WILDCARDMATCH (3)
+Protocol:
+  - FTP
+Added-in: 7.21.0
+---
+
+# NAME
+
+CURLOPT_FNMATCH_DATA - pointer passed to the fnmatch callback
+
+# SYNOPSIS
+
+~~~c
+#include <curl/curl.h>
+
+CURLcode curl_easy_setopt(CURL *handle, CURLOPT_FNMATCH_DATA,
+                          void *pointer);
+~~~
+
+# DESCRIPTION
+
+Pass a pointer that is untouched by libcurl and passed as the ptr argument to
+the CURLOPT_FNMATCH_FUNCTION(3).
+
+# DEFAULT
+
+NULL
+
+# %PROTOCOLS%
+
+# EXAMPLE
+
+~~~c
+extern int string_match(const char *s1, const char *s2);
+
+struct local_stuff {
+  void *custom;
+};
+
+static int my_fnmatch(void *clientp,
+                      const char *pattern, const char *string)
+{
+  struct local_stuff *my = clientp;
+  printf("my ptr: %p\n", my->custom);
+
+  if(string_match(pattern, string))
+    return CURL_FNMATCHFUNC_MATCH;
+  else
+    return CURL_FNMATCHFUNC_NOMATCH;
+}
+
+int main(void)
+{
+  struct local_stuff local_data;
+  CURL *curl = curl_easy_init();
+  if(curl) {
+    curl_easy_setopt(curl, CURLOPT_URL, "ftp://ftp.example.com/file*");
+    curl_easy_setopt(curl, CURLOPT_WILDCARDMATCH, 1L);
+    curl_easy_setopt(curl, CURLOPT_FNMATCH_FUNCTION, my_fnmatch);
+    curl_easy_setopt(curl, CURLOPT_FNMATCH_DATA, &local_data);
+
+    curl_easy_perform(curl);
+  }
+}
+~~~
+
+# %AVAILABILITY%
+
+# RETURN VALUE
+
+curl_easy_setopt(3) returns a CURLcode indicating success or error.
+
+CURLE_OK (0) means everything was OK, non-zero means an error occurred, see
+libcurl-errors(3).