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authorChristopher Head <chead@chead.ca>2018-07-24 22:47:23 -0700
committerDaniel Stenberg <daniel@haxx.se>2018-07-26 16:24:43 +0200
commit9526cbe6bca1f9389fa84e5b0e5e2dc173e82f0d (patch)
tree1fb3c022c3d2483d38497d890175557a7bf1f7f1 /docs/THANKS-filter
parent10d8f3f1344b958a9bea3b3d9f607bc624bce410 (diff)
docs/CURLOPT_WRITEFUNCTION: size is always 1
For compatibility with `fwrite`, the `CURLOPT_WRITEFUNCTION` callback is passed two `size_t` parameters which, when multiplied, designate the number of bytes of data passed in. In practice, CURL always sets the first parameter (`size`) to 1. This practice is also enshrined in documentation and cannot be changed in future. The documentation states that the default callback is `fwrite`, which means `fwrite` must be a suitable function for this purpose. However, the documentation also states that the callback must return the number of *bytes* it successfully handled, whereas ISO C `fwrite` returns the number of items (each of size `size`) which it wrote. The only way these numbers can be equal is if `size` is 1. Since `size` is 1 and can never be changed in future anyway, document that fact explicitly and let users rely on it. Closes #2787
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