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77 lines
2.3 KiB
Groff
77 lines
2.3 KiB
Groff
.\" generated by cd2nroff 0.1 from CURLOPT_UPLOAD.md
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.TH CURLOPT_UPLOAD 3 "2024-06-01" libcurl
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.SH NAME
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CURLOPT_UPLOAD \- data upload
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.SH SYNOPSIS
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.nf
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#include <curl/curl.h>
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CURLcode curl_easy_setopt(CURL *handle, CURLOPT_UPLOAD, long upload);
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.fi
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.SH DESCRIPTION
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The long parameter \fIupload\fP set to 1 tells the library to prepare for and
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perform an upload. The \fICURLOPT_READDATA(3)\fP and
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\fICURLOPT_INFILESIZE(3)\fP or \fICURLOPT_INFILESIZE_LARGE(3)\fP options are
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also interesting for uploads. If the protocol is HTTP, uploading means using
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the PUT request unless you tell libcurl otherwise.
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Using PUT with HTTP 1.1 implies the use of a "Expect: 100\-continue" header.
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You can disable this header with \fICURLOPT_HTTPHEADER(3)\fP as usual.
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If you use PUT to an HTTP 1.1 server, you can upload data without knowing the
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size before starting the transfer. The library enables this by adding a header
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\&"Transfer\-Encoding: chunked". With HTTP 1.0 or if you prefer not to use chunked
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transfer, you must specify the size of the data with
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\fICURLOPT_INFILESIZE(3)\fP or \fICURLOPT_INFILESIZE_LARGE(3)\fP.
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.SH DEFAULT
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0, default is download
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.SH PROTOCOLS
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All
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.SH EXAMPLE
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.nf
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static size_t read_cb(char *ptr, size_t size, size_t nmemb, void *userdata)
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{
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FILE *src = userdata;
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/* copy as much data as possible into the 'ptr' buffer, but no more than
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'size' * 'nmemb' bytes */
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size_t retcode = fread(ptr, size, nmemb, src);
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return retcode;
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}
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int main(void)
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{
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CURL *curl = curl_easy_init();
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if(curl) {
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FILE *src = fopen("local-file", "r");
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curl_off_t fsize; /* set this to the size of the input file */
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/* we want to use our own read function */
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curl_easy_setopt(curl, CURLOPT_READFUNCTION, read_cb);
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/* enable uploading */
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curl_easy_setopt(curl, CURLOPT_UPLOAD, 1L);
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/* specify target */
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curl_easy_setopt(curl, CURLOPT_URL, "ftp://example.com/dir/to/newfile");
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/* now specify which pointer to pass to our callback */
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curl_easy_setopt(curl, CURLOPT_READDATA, src);
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/* Set the size of the file to upload */
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curl_easy_setopt(curl, CURLOPT_INFILESIZE_LARGE, (curl_off_t)fsize);
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/* Now run off and do what you have been told! */
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curl_easy_perform(curl);
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}
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}
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.fi
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.SH AVAILABILITY
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Always
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.SH RETURN VALUE
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Returns CURLE_OK
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.SH SEE ALSO
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.BR CURLOPT_INFILESIZE_LARGE (3),
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.BR CURLOPT_PUT (3),
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.BR CURLOPT_READFUNCTION (3)
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