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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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8
src/libexpr/get-drvs.cc
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@ -168,7 +168,7 @@ PackageInfo::Outputs PackageInfo::queryOutputs(bool withPaths, bool onlyOutputsT
for (auto elem : outTI->listView()) {
if (elem->type() != nString)
throw errMsg;
auto out = outputs.find(elem->c_str());
auto out = outputs.find(elem->string_view());
if (out == outputs.end())
throw errMsg;
result.insert(*out);
@ -245,7 +245,7 @@ std::string PackageInfo::queryMetaString(const std::string & name)
Value * v = queryMeta(name);
if (!v || v->type() != nString)
return "";
return v->c_str();
return std::string{v->string_view()};
}
NixInt PackageInfo::queryMetaInt(const std::string & name, NixInt def)
@ -258,7 +258,7 @@ NixInt PackageInfo::queryMetaInt(const std::string & name, NixInt def)
if (v->type() == nString) {
/* Backwards compatibility with before we had support for
integer meta fields. */
if (auto n = string2Int<NixInt::Inner>(v->c_str()))
if (auto n = string2Int<NixInt::Inner>(v->string_view()))
return NixInt{*n};
}
return def;
@ -274,7 +274,7 @@ NixFloat PackageInfo::queryMetaFloat(const std::string & name, NixFloat def)
if (v->type() == nString) {
/* Backwards compatibility with before we had support for
float meta fields. */
if (auto n = string2Float<NixFloat>(v->c_str()))
if (auto n = string2Float<NixFloat>(v->string_view()))
return *n;
}
return def;