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.TH CURLOPT_CONV_FROM_UTF8_FUNCTION 3 "December 04, 2023" "ibcurl 8.5.0" libcurl

.SH NAME
CURLOPT_CONV_FROM_UTF8_FUNCTION \- convert data from UTF8 to host encoding
.SH SYNOPSIS
.nf
#include <curl/curl.h>

CURLcode conv_callback(char *ptr, size_t length);

CURLcode curl_easy_setopt(CURL *handle, CURLOPT_CONV_FROM_UTF8_FUNCTION,
                          conv_callback);
.SH DESCRIPTION
Pass a pointer to your callback function, which should match the prototype
shown above.

Applies to non-ASCII platforms. \fIcurl_version_info(3)\fP returns 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 \fIptr\fP parameter.
The amount of data to convert is indicated by the \fIlength\fP parameter.  The
converted data overlays the input data in the buffer pointed to by the ptr
parameter. \fICURLE_OK\fP must be returned upon successful conversion.  A
CURLcode return value defined by curl.h, such as \fICURLE_CONV_FAILED\fP,
should be returned if an error was encountered.

\fICURLOPT_CONV_FROM_UTF8_FUNCTION(3)\fP converts to host encoding from UTF8
encoding. It is required only for SSL processing.

If you set a callback pointer to NULL, or do not set it at all, the built-in
libcurl iconv functions are used. If HAVE_ICONV was not defined when libcurl
was built, and no callback has been established, the conversion returns 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 defaults 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 need to override these definitions if they are different on your system.
.SH DEFAULT
NULL
.SH PROTOCOLS
TLS-based protocols.
.SH EXAMPLE
.nf
static CURLcode my_conv_from_utf8_to_ebcdic(char *buffer, size_t length)
{
  int rc = 0;
  /* in-place convert 'buffer' from UTF-8 to EBCDIC */
  if(rc == 0) {
    /* success */
    return CURLE_OK;
  }
  else {
    return CURLE_CONV_FAILED;
  }
}

int main(void)
{
  CURL *curl = curl_easy_init();
  curl_easy_setopt(curl, CURLOPT_CONV_FROM_UTF8_FUNCTION,
                   my_conv_from_utf8_to_ebcdic);
}
.fi
.SH AVAILABILITY
Not available and deprecated since 7.82.0.

Available only if \fBCURL_DOES_CONVERSIONS\fP was defined when libcurl was
built.
.SH RETURN VALUE
Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
.SH "SEE ALSO"
.BR CURLOPT_CONV_FROM_NETWORK_FUNCTION (3),
.BR CURLOPT_CONV_TO_NETWORK_FUNCTION (3)