I am trying to write a http client to send a HTTPs PUT request and save the response in memory. To try this I have combined the anyauthput.c <https://curl.se/libcurl/c/anyauthput.html>and getinmemory.c <https://curl.se/libcurl/c/getinmemory.html>examples but when I run it the user pointer set via the CURLOPT_WRITEDATA is not being passed back in the callback. Instead a different pointer is passed (and so trying to access it leads to a segmentation fault).
I have put the code on my google drive if anyone cares to have a look. <https://drive.google.com/file/d/11YVmqj4qGxSy5Ax_55PYz6POzoYDGpyT/view?usp=sharing> I have reviewed the code many times and cannot see what it is I'm doing wrong. I'm starting to suspect a bug in libcurl but would like to eliminate anything obvious someone could see that I'm overlooking. I print the value of the pointer set in CURLOPT_WRITEDATA and the value that is passed when the callback is invoked and I can clearly see it is different. in the main initialization: struct MemoryStruct chunk; curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, WriteMemoryCallback); curl_easy_setopt(curl, CURLOPT_WRITEDATA, (void *)(*&chunk*)); *printf("chunk: %p, chunk.memory: %p, chunk.size: %lu\n", &chunk, chunk.memory, (unsigned long)chunk.size);* in WriteMemoryCallback: static size_t WriteMemoryCallback(void *contents, size_t size, size_t nmemb, *void *userp*) { *fprintf(stderr, "contents: %p, size: %lu, nmemb: %lu, userp: %p\n", contents, size, nmemb, userp);* The print output shows the following: chunk: *0x7ffc7f6ea470*, chunk.memory: 0x15b4840, chunk.size: 0 ... contents: 0x15d5dc0, size: 1, nmemb: 15, userp: *0x1593010* Can anyone help ? Thanks.
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