.\" generated by cd2nroff 0.1 from CURLOPT_COPYPOSTFIELDS.md
.TH CURLOPT_COPYPOSTFIELDS 3 "2024-11-18" libcurl
.SH NAME
CURLOPT_COPYPOSTFIELDS \- have libcurl copy data to POST
.SH SYNOPSIS
.nf
#include <curl/curl.h>

CURLcode curl_easy_setopt(CURL *handle, CURLOPT_COPYPOSTFIELDS, char *data);
.fi
.SH DESCRIPTION
Pass a char pointer as parameter, which should be the full \fIdata\fP to post in a
HTTP POST operation. It behaves as the \fICURLOPT_POSTFIELDS(3)\fP option, but the
original data is instead copied by the library, allowing the application to
overwrite the original data after setting this option.

Because data are copied, care must be taken when using this option in
conjunction with \fICURLOPT_POSTFIELDSIZE(3)\fP or
\fICURLOPT_POSTFIELDSIZE_LARGE(3)\fP: If the size has not been set prior to
\fICURLOPT_COPYPOSTFIELDS(3)\fP, the data is assumed to be a null\-terminated
string; else the stored size informs the library about the byte count to
copy. In any case, the size must not be changed after
\fICURLOPT_COPYPOSTFIELDS(3)\fP, unless another \fICURLOPT_POSTFIELDS(3)\fP or
\fICURLOPT_COPYPOSTFIELDS(3)\fP option is issued.
.SH DEFAULT
NULL
.SH PROTOCOLS
This functionality affects http only
.SH EXAMPLE
.nf
int main(void)
{
  CURL *curl = curl_easy_init();
  if(curl) {
    char local_buffer[1024]="data to send";
    curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");

    /* size of the data to copy from the buffer and send in the request */
    curl_easy_setopt(curl, CURLOPT_POSTFIELDSIZE, 12L);

    /* send data from the local stack */
    curl_easy_setopt(curl, CURLOPT_COPYPOSTFIELDS, local_buffer);

    curl_easy_perform(curl);
  }
}
.fi
.SH AVAILABILITY
Added in curl 7.17.1
.SH RETURN VALUE
Returns CURLE_OK if the option is supported, CURLE_UNKNOWN_OPTION if not, or
CURLE_OUT_OF_MEMORY if there was insufficient heap space.
.SH SEE ALSO
.BR CURLOPT_MIMEPOST (3),
.BR CURLOPT_POSTFIELDS (3),
.BR CURLOPT_POSTFIELDSIZE (3),
.BR CURLOPT_UPLOAD (3)