lcpex rewrite - alpha

src/lcpex/string_expansion/string_expansion.cpp

@@ -0,0 +1,24 @@
+#include "string_expansion.h"
+
+// convert a string to a char** representing our artificial argv to be consumed by execvp
+char ** expand_env(const std::string& var, int flags )
+{
+    std::vector<std::string> vars;
+
+    wordexp_t p;
+    if(!wordexp(var.c_str(), &p, flags))
+    {
+        if(p.we_wordc)
+            for(char** exp = p.we_wordv; *exp; ++exp)
+                vars.push_back(exp[0]);
+        wordfree(&p);
+    }
+
+    char ** arr = new char*[vars.size() + 1];
+    for(size_t i = 0; i < vars.size(); i++){
+        arr[i] = new char[vars[i].size() + 1];
+        strcpy(arr[i], vars[i].c_str());
+    }
+    arr[vars.size()] = (char * ) nullptr;
+    return arr;
+}