Fix some slightly incorrect uses of checkprefix #6993
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In various places
checkprefix
function is used in a way that can lead to potential forward compatibility issues. As an example if new authentication method"NTLM3"
would be added,checkprefix("NTLM", auth)
would incorrectly match it. Now either space, null char, or comma is required after the method value.In addition fixed a bogus use of
checkprefix
function in Kerberosname_to_level
function. TheCURLOPT_KRBLEVEL
API provided string was used as the prefix to check. It would kind of work if correct values were passed but would match incomplete strings as specific values. For example"c"
would match toPROT_CLEAR
. Usingcurl_strequal
makes more sense here.