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.TH CURLOPT_CONV_TO_NETWORK_FUNCTION 3 "November 04, 2020" "libcurl 7.77.0" "curl_easy_setopt options"

.SH NAME
CURLOPT_CONV_TO_NETWORK_FUNCTION \- convert data to network from 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_TO_NETWORK_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 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 \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.

\fBCURLOPT_CONV_TO_NETWORK_FUNCTION\fP converts from host encoding to the
network encoding.  It is used when commands or ASCII data are sent over the
network.

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.
.SH DEFAULT
NULL
.SH PROTOCOLS
FTP, SMTP, IMAP, POP3
.SH EXAMPLE
.nf
static CURLcode my_conv_from_ebcdic_to_ascii(char *buffer, size_t length)
{
  char *tempptrin, *tempptrout;
  size_t bytes = length;
  int rc;
  tempptrin = tempptrout = buffer;
  rc = platform_e2a(&tempptrin, &bytes, &tempptrout, &bytes);
  if(rc == PLATFORM_CONV_OK) {
    return CURLE_OK;
  }
  else {
    return CURLE_CONV_FAILED;
  }
}

curl_easy_setopt(curl, CURLOPT_CONV_TO_NETWORK_FUNCTION,
                 my_conv_from_ebcdic_to_ascii);
.fi
.SH AVAILABILITY
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), " CURLOPT_CONV_FROM_UTF8_FUNCTION "(3), "
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