NAME

       CURLOPT_CONV_FROM_NETWORK_FUNCTION - convert data from network 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_NETWORK_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) 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_NETWORK_FUNCTION converts to host encoding from  the  network  encoding.
       It is used when commands or ASCII data are received over the network.

       If you set a callback pointer to NULL, or do not 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

       FTP, SMTP, IMAP, POP3

EXAMPLE

       static CURLcode my_conv_from_ascii_to_ebcdic(char *buffer, size_t length)
       {
         char *tempptrin, *tempptrout;
         size_t bytes = length;
         int rc;
         tempptrin = tempptrout = buffer;
         rc = platform_a2e(&tempptrin, &bytes, &tempptrout, &bytes);
         if(rc == PLATFORM_CONV_OK) {
           return CURLE_OK;
         }
         else {
           return CURLE_CONV_FAILED;
         }
       }

       /* use platform-specific functions for codeset conversions */
       curl_easy_setopt(curl, CURLOPT_CONV_FROM_NETWORK_FUNCTION,
                        my_conv_from_ascii_to_ebcdic);

AVAILABILITY

       Not available since 7.82.0

       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_UTF8_FUNCTION(3),