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comparison mupdf-source/thirdparty/curl/docs/libcurl/opts/CURLOPT_WRITEDATA.3 @ 2:b50eed0cc0ef upstream

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ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4. The directory name has changed: no version number in the expanded directory now.
author Franz Glasner <fzglas.hg@dom66.de>
date Mon, 15 Sep 2025 11:43:07 +0200
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23 .TH CURLOPT_WRITEDATA 3 "16 Jun 2014" "libcurl 7.37.0" "curl_easy_setopt options"
24 .SH NAME
25 CURLOPT_WRITEDATA \- custom pointer passed to the write callback
26 .SH SYNOPSIS
27 #include <curl/curl.h>
28
29 CURLcode curl_easy_setopt(CURL *handle, CURLOPT_WRITEDATA, void *pointer);
30 .SH DESCRIPTION
31 A data \fIpointer\fP to pass to the write callback. If you use the
32 \fICURLOPT_WRITEFUNCTION(3)\fP option, this is the pointer you'll get in that
33 callback's 4th argument. If you don't use a write callback, you must make
34 \fIpointer\fP a 'FILE *' (cast to 'void *') as libcurl will pass this to
35 \fIfwrite(3)\fP when writing data.
36
37 The internal \fICURLOPT_WRITEFUNCTION(3)\fP will write the data to the FILE *
38 given with this option, or to stdout if this option hasn't been set.
39
40 If you're using libcurl as a win32 DLL, you \fBMUST\fP use a
41 \fICURLOPT_WRITEFUNCTION(3)\fP if you set this option or you will experience
42 crashes.
43 .SH DEFAULT
44 By default, this is a FILE * to stdout.
45 .SH PROTOCOLS
46 Used for all protocols.
47 .SH EXAMPLE
48 A common technique is to use the write callback to store the incoming data
49 into a dynamically growing allocated buffer, and then this
50 \fICURLOPT_WRITEDATA(3)\fP is used to point to a struct or the buffer to store
51 data in. Like in the getinmemory example:
52 https://curl.haxx.se/libcurl/c/getinmemory.html
53 .SH AVAILABILITY
54 Available in all libcurl versions. This option was formerly known as
55 \fICURLOPT_FILE\fP, the name \fICURLOPT_WRITEDATA(3)\fP was introduced in
56 7.9.7.
57 .SH RETURN VALUE
58 This will return CURLE_OK.
59 .SH "SEE ALSO"
60 .BR CURLOPT_WRITEFUNCTION "(3), " CURLOPT_READDATA "(3), "