Add QUtil::make_shared_array to help with PointerHolder transition

3 files changed, 14 insertions, 9 deletions

diff --git a/include/qpdf/QUtil.hh b/include/qpdf/QUtil.hh
index 927fc1d8..b4cb1f6a 100644
--- a/include/qpdf/QUtil.hh
+++ b/include/qpdf/QUtil.hh
@@ -165,6 +165,15 @@ namespace QUtil
     QPDF_DLL
     std::unique_ptr<char[]> make_unique_cstr(std::string const&);
 
+    // Create a shared pointer to an array. From c++20,
+    // std::make_shared<T[]>(n) does this.
+    template <typename T>
+    std::shared_ptr<T>
+    make_shared_array(size_t n)
+    {
+        return std::shared_ptr<T>(new T[n], std::default_delete<T[]>());
+    }
+
     // Returns lower-case hex-encoded version of the string, treating
     // each character in the input string as unsigned.  The output
     // string will be twice as long as the input string.
diff --git a/libqpdf/QPDFArgParser.cc b/libqpdf/QPDFArgParser.cc
index b1658fea..9ddb120c 100644
--- a/libqpdf/QPDFArgParser.cc
+++ b/libqpdf/QPDFArgParser.cc
@@ -299,9 +299,8 @@ QPDFArgParser::handleArgFileArguments()
                 QUtil::make_shared_cstr(this->m->argv[i]));
         }
     }
-    this->m->argv_ph = std::shared_ptr<char const*>(
-        new char const*[1 + this->m->new_argv.size()],
-        std::default_delete<char const*[]>());
+    this->m->argv_ph = QUtil::make_shared_array<char const*>(
+        1 + this->m->new_argv.size());
     for (size_t i = 0; i < this->m->new_argv.size(); ++i)
     {
         this->m->argv_ph.get()[i] = this->m->new_argv.at(i).get();
@@ -404,9 +403,8 @@ QPDFArgParser::handleBashArguments()
     }
     // Explicitly discard any non-space-terminated word. The "current
     // word" is handled specially.
-    this->m->bash_argv_ph = std::shared_ptr<char const*>(
-        new char const*[1 + this->m->bash_argv.size()],
-        std::default_delete<char const*[]>());
+    this->m->bash_argv_ph = QUtil::make_shared_array<char const*>(
+        1 + this->m->bash_argv.size());
     for (size_t i = 0; i < this->m->bash_argv.size(); ++i)
     {
         this->m->bash_argv_ph.get()[i] = this->m->bash_argv.at(i).get();
diff --git a/libqpdf/QUtil.cc b/libqpdf/QUtil.cc
index 503d79f9..1f179fd5 100644
--- a/libqpdf/QUtil.cc
+++ b/libqpdf/QUtil.cc
@@ -735,9 +735,7 @@ QUtil::copy_string(std::string const& str)
 std::shared_ptr<char>
 QUtil::make_shared_cstr(std::string const& str)
 {
-    auto result = std::shared_ptr<char>(
-        new char[str.length() + 1],
-        std::default_delete<char[]>());
+    auto result = QUtil::make_shared_array<char>(str.length() + 1);
     // Use memcpy in case string contains nulls
     result.get()[str.length()] = '\0';
     memcpy(result.get(), str.c_str(), str.length());