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authorJay Satiro <raysatiro@yahoo.com>2019-12-26 02:26:08 -0500
committerJay Satiro <raysatiro@yahoo.com>2019-12-26 02:26:08 -0500
commit97934a2f7129d286bf57c90cd2394a5c48dd1fa8 (patch)
treeac11ba2bce7211ef1d1308804ba7ece831382fef /tests/libtest/sethostname.h
parent68da0b8b8694328b214e687a6cff5cbb744dcfd5 (diff)
CURLOPT_HEADERFUNCTION.3: Document that size is always 1
For compatibility with `fwrite`, the `CURLOPT_HEADERFUNCTION` 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. Reported-by: Frank Gevaerts Commit-message-by: Christopher Head Ref: https://github.com/curl/curl/pull/2787 Fixes https://github.com/curl/curl/issues/4758
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