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libutil: Add requireCString, make renderUrlPathEnsureLegal error on NUL bytes better

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Same utility as in lix's change I3caf476e59dcb7899ac5a3d83dfa3fb7ceaaabf0.

Co-authored-by: eldritch horrors <pennae@lix.systems>
This commit is contained in:
Sergei Zimmerman 2025-11-18 00:29:23 +03:00
parent 72dbd43882
commit 533cced249
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3 changed files with 22 additions and 2 deletions
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7
src/libutil/url.cc
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@ -327,8 +327,11 @@ Path renderUrlPathEnsureLegal(const std::vector<std::string> & urlPath)
/* This is only really valid for UNIX. Windows has more restrictions. */
if (comp.contains('/'))
throw BadURL("URL path component '%s' contains '/', which is not allowed in file names", comp);
if (comp.contains(char(0)))
throw BadURL("URL path component '%s' contains NUL byte which is not allowed", comp);
if (comp.contains(char(0))) {
using namespace std::string_view_literals;
auto str = replaceStrings(comp, "\0"sv, "␀"sv);
throw BadURL("URL path component '%s' contains NUL byte which is not allowed", str);
}
}
return concatStringsSep("/", urlPath);