[clang] [flang] [llvm] [clang-tools-extra] [flang ]GETLOG runtime and extension implementation: get login username (PR #70917)

[David Truby via cfe-commits]

================
@@ -37,5 +75,19 @@ void FORTRAN_PROCEDURE_NAME(getarg)(
   (void)RTNAME(GetCommandArgument)(
       n, &value, nullptr, nullptr, __FILE__, __LINE__);
 }
+
+void FORTRAN_PROCEDURE_NAME(getlog)(std::int8_t *arg, std::int64_t length) {
+  std::array<char, LOGIN_NAME_MAX + 1> str;
+  int error = getlogin_r(str.data(), str.size());
+  assert(error == 0 && "getlogin_r returned an error");
+
+  // Trim space from right/end
+  int i = str.size();
+  while (' ' == str[--i]) {
+    str[i] = 0;
+  }
----------------
DavidTruby wrote:

`std::replace(str.rbegin(), str.rend(), ' ', '\0');`
would be clearer I think?

https://github.com/llvm/llvm-project/pull/70917
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