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Use less c_str() in the evaluator, and other cleanups

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It is better to avoid null termination for performance and memory
safety, wherever possible.

These are good cleanups extracted from the Pascal String work that we
can land by themselves first, shrinking the diff in that PR.

Co-Authored-By: Aspen Smith <root@gws.fyi>
Co-Authored-By: Sergei Zimmerman <sergei@zimmerman.foo>
This commit is contained in:
John Ericson 2025-11-01 16:54:22 -04:00 • committed by Sergei Zimmerman
parent 2d83bc6b83
commit bd42092873
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16 changed files with 64 additions and 38 deletions
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6
src/libexpr/eval-cache.cc
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@ -406,7 +406,7 @@ Value & AttrCursor::forceValue()
if (root->db && (!cachedValue || std::get_if<placeholder_t>(&cachedValue->second))) {
if (v.type() == nString)
cachedValue = {root->db->setString(getKey(), v.c_str(), v.context()), string_t{v.c_str(), {}}};
cachedValue = {root->db->setString(getKey(), v.string_view(), v.context()), string_t{v.string_view(), {}}};
else if (v.type() == nPath) {
auto path = v.path().path;
cachedValue = {root->db->setString(getKey(), path.abs()), string_t{path.abs(), {}}};
@ -541,7 +541,7 @@ std::string AttrCursor::getString()
if (v.type() != nString && v.type() != nPath)
root->state.error<TypeError>("'%s' is not a string but %s", getAttrPathStr(), showType(v)).debugThrow();
return v.type() == nString ? v.c_str() : v.path().to_string();
return v.type() == nString ? std::string(v.string_view()) : v.path().to_string();
}
string_t AttrCursor::getStringWithContext()
@ -580,7 +580,7 @@ string_t AttrCursor::getStringWithContext()
if (v.type() == nString) {
NixStringContext context;
copyContext(v, context);
return {v.c_str(), std::move(context)};
return {std::string{v.string_view()}, std::move(context)};
} else if (v.type() == nPath)
return {v.path().to_string(), {}};
else