On Mon, 14 Feb 2022, Henrik Holst wrote:
So first ".curlrc" is strlen:ed and then 7 calls to alloc_addbyter() which is the exact length of ".curlrc" so it looks like some function goes over strings one byte at a time and adds them to a dynamic buffer one by one. Perhaps this is done to exclude invalid characters or something?
I believe it is the curl_maprintf() function, probably the one called from src/tool_findfile.c that builds paths to use when checking for .curlrc in various places.
alloc_addbyter() could most likely be optimized to do a single write to the buffer instead of calling memcpy() by way of Curl_dyn_addn(buf, out, 1)
I'm sure it can, but it will take some interesting massaging of the *printf() code to get done. I don't think it's a low hanging fruit.
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