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ircd: Add mutable_buffer based replace_copy stringop.

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This commit is contained in:
Jason Volk 2019-06-26 01:22:52 -07:00
parent 5c03f4e08f
commit 19b85ef908
1 changed files with 16 additions and 4 deletions
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20
include/ircd/stringops.h
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@ -102,6 +102,7 @@ namespace ircd
std::string replace(const string_view &, const char &before, const string_view &after);
std::string replace(const string_view &, const string_view &before, const string_view &after);
string_view replace(const mutable_buffer &, const char &before, const char &after);
string_view replace(const mutable_buffer &out, const string_view &in, const char &before, const char &after);
// Truncate view at maximum length
string_view trunc(const string_view &, const size_t &max);
@ -372,16 +373,27 @@ ircd::replace(const mutable_buffer &out,
const char &before,
const char &after)
{
const auto &end_in
const size_t cpsz
{
std::(begin(in), std::min(size(in), size(out)))
std::min(size(in), size(out))
};
return
// Branch for in-place copy if in and out are the same. Note that
// if this branch is not taken they cannot overlap in any way.
if(data(in) == data(out))
return replace(mutable_buffer(data(out), cpsz), before, after);
const auto &end_in
{
std::next(begin(in), cpsz)
};
const auto &end_out
{
begin(out),
std::replace_copy(begin(in), end_in, begin(out), before, after)
};
return { begin(out), end_out };
}
inline ircd::string_view