GNURLOPT_C...8_FUNCTION(3)

💅 GNURLOPT_C...8_FUNCTION(3) — curl_easy_setopt options 💅

okay bestie, this is the GNURLOPT_C...8_FUNCTION(3) page from the curl_easy_setopt options manual, and it’s lowkey a niche fave 💅✨

✨ NAME ✨

CURLOPT_CONV_FROM_UTF8_FUNCTION — convert data from UTF8 to host encoding 🦋

🎀 SYNOPSIS 🎀

#include <gnurl/curl.h>

CURLcode conv_callback(char *ptr, size_t length);

CURLcode curl_easy_setopt(CURL *handle, CURLOPT_CONV_FROM_UTF8_FUNCTION,
                                 conv_callback);

🦋 DESCRIPTION 🦋

Pass a pointer to your callback function, bestie, and make sure it matches the prototype up there 👆✨

This one applies to non-ASCII platforms. curl_version_info(3) will return the CURL_VERSION_CONV feature bit set if this option is provided 🌈

The data to be converted is in a buffer pointed to by the ptr parameter. The amount of data to convert is indicated by the length parameter. The converted data overlays the input data in the buffer pointed to by the ptr parameter. CURLE_OK must be returned upon successful conversion. A CURLcode return value defined by curl.h, such as CURLE_CONV_FAILED, should be returned if an error was encountered 😭💅

CURLOPT_CONV_FROM_UTF8_FUNCTION converts to host encoding from UTF8 encoding. It is required only for SSL processing 👑

If you set a callback pointer to NULL, or don’t set it at all, the built-in libcurl iconv functions will be used. If HAVE_ICONV was not defined when libcurl was built, and no callback has been established, conversion will return the CURLE_CONV_REQD error code 💀

If HAVE_ICONV is defined, CURL_ICONV_CODESET_OF_HOST must also be defined. For example:

#define CURL_ICONV_CODESET_OF_HOST "IBM-1047"

The iconv code in libcurl will default the network and UTF8 codeset names as follows:

#define CURL_ICONV_CODESET_OF_NETWORK "ISO8859-1"

#define CURL_ICONV_CODESET_FOR_UTF8   "UTF-8"

You will need to override these definitions if they are different on your system 🫶

🍓 DEFAULT 🍓

NULL

🌈 PROTOCOLS 🌈

TLS-based protocols ✨

🔥 EXAMPLE 🔥

static CURLcode my_conv_from_utf8_to_ebcdic(char *buffer, size_t length)
{
  char *tempptrin, *tempptrout;
  size_t bytes = length;
  int rc;
  tempptrin = tempptrout = buffer;
  rc = platform_u2e(&tempptrin, &bytes, &tempptrout, &bytes);
  if(rc == PLATFORM_CONV_OK) {
    return CURLE_OK;
  }
  else {
    return CURLE_CONV_FAILED;
  }
}

curl_easy_setopt(curl, CURLOPT_CONV_FROM_UTF8_FUNCTION,
                 my_conv_from_utf8_to_ebcdic);

🌸 AVAILABILITY 🌸

Available only if CURL_DOES_CONVERSIONS was defined when libcurl was built 🧚

👑 RETURN VALUE 👑

Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not 💖

🫶 SEE ALSO 🫶

• CURLOPT_CONV_TO_NETWORK_FUNCTION(3)
• CURLOPT_CONV_FROM_NETWORK_FUNCTION(3)

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okay that’s the whole page 💖 this cutie is from libcurl 7.37.0, dated 19 Jun 2014, and it lives under the GNURLOPT_C...8_FUNCTION(3) manual name — periodt ✨🫶