GNURLOPT_FNMATCH_FUNCTION(3)

💅 GNURLOPT_F...CH_FUNCTION(3) 💅

okay so this page is from the curl_easy_setopt options manual, and it's all about the wildcard matching function callback, bestie. no cap, it's giving very-specific-but-iconic.

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✨ NAME ✨

• CURLOPT_FNMATCH_FUNCTION — wildcard matching function callback. that's the whole name, periodt.

🎀 SYNOPSIS 🎀

#include <gnurl/curl.h>

int fnmatch_callback(void *ptr,
                     const char *pattern,
                     const char *string);

CURLcode curl_easy_setopt(CURL *handle, CURLOPT_FNMATCH_FUNCTION,
                          fnmatch_callback);

🦋 DESCRIPTION 🦋

okay so you pass a pointer to your callback function, and it should match the prototype shown above exactly. like, character-for-character match the vibe.

This callback is used for wildcard matching. yes bestie, wildcard matching is the main character here.

Your callback returns CURL_FNMATCHFUNC_MATCH if pattern matches the string, CURL_FNMATCHFUNC_NOMATCH if not, or CURL_FNMATCHFUNC_FAIL if an error occurred. those are the three constants, and you gotta use them exactly.

🌸 DEFAULT 🌸

NULL == an internal function for wildcard matching.

so if you don't set this, the default is NULL, and that means an internal function for wildcard matching handles it. lowkey convenient.

💜 PROTOCOLS 💜

FTP — that's it. this one is FTP-coded, fr fr.

🍓 EXAMPLE 🍓

here's the exact example, no edits, no cap:

static int my_fnmatch(void *clientp,
                      const char *pattern, const char *string)
{
  struct local_stuff *data = (struct local_stuff *)clientp;
  if(string_match(pattern, string))
    return CURL_FNMATCHFUNC_MATCH;
  else
    return CURL_FNMATCHFUNC_NOMATCH;
}

{
  struct local_stuff local_data;
  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);
}

🌈 AVAILABILITY 🌈

Added in 7.21.0 — she's been around, bestie.

🔥 RETURN VALUE 🔥

Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not. that's the return value tea.

👑 SEE ALSO 👑

go read CURLOPT_FNMATCH_DATA(3), CURLOPT_DEBUGFUNCTION(3), too, okay? those are the references, comma and all.

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okay bye bestie 💖 this was GNURLOPT_F...CH_FUNCTION(3) from libcurl 7.37.0, dated 19 Jun 2014 — slay, periodt. 🫶