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CURLOPT_CO...F8_FUNCTION(3) Library Functions Manual CURLOPT_CO...F8_FUNCTION(3)

NAME
     CURLOPT_CONV_FROM_UTF8_FUNCTION - convert data from UTF8 to host encoding

SYNOPSIS
     #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);

DESCRIPTION
     Pass  a pointer to your callback function, which should match the prototype
     shown above.

     Applies to non-ASCII platforms. curl_version_info(3) returns the  CURL_VER-
     SION_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  re-
     turned if an error was encountered.

     CURLOPT_CONV_FROM_UTF8_FUNCTION(3)  converts to host encoding from UTF8 en-
     coding. 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  conver-
     sion 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 sys-
     tem.

DEFAULT
     NULL

PROTOCOLS
     This functionality affects all supported protocols

EXAMPLE
     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);
     }

DEPRECATED
     Not available and deprecated since 7.82.0.

     Available only if CURL_DOES_CONVERSIONS was defined when libcurl was built.

AVAILABILITY
     Added in curl 7.15.4

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).

SEE ALSO
     CURLOPT_CONV_FROM_NETWORK_FUNCTION(3), CURLOPT_CONV_TO_NETWORK_FUNCTION(3)

libcurl 			   2026-06-11	     CURLOPT_CO...F8_FUNCTION(3)

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