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* builtins.substring: if "start" is beyond the end of the string,

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return the empty string.
This commit is contained in:
Eelco Dolstra 2011-01-14 12:47:10 +00:00
parent d6c8b995c5
commit 9db190eb31
3 changed files with 4 additions and 2 deletions
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2
src/libexpr/primops.cc
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@ -965,7 +965,7 @@ static void prim_substring(EvalState & state, Value * * args, Value & v)
if (start < 0) throw EvalError("negative start position in `substring'"); if (start < 0) throw EvalError("negative start position in `substring'");
mkString(v, string(s, start, len), context); mkString(v, start >= s.size() ? "" : string(s, start, len), context);
} }

2
tests/lang/eval-okay-substring.exp
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@ -1 +1 @@
"ooxfoobarybarzobaabb" "ooxfoobarybarzobaabbc"

2
tests/lang/eval-okay-substring.nix
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@ -17,3 +17,5 @@ substring 1 2 s
+ substring 3 0 s + substring 3 0 s
+ "b" + "b"
+ substring 3 1 s + substring 3 1 s
+ "c"
+ substring 5 10 "perl"