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;
+}

src/lcpex/string_expansion/string_expansion.h

@@ -0,0 +1,29 @@
+#ifndef LCPEX_STRING_EXPANSION_H
+#define LCPEX_STRING_EXPANSION_H
+
+#include <wordexp.h>
+#include <vector>
+#include <cstring>
+#include <iostream>
+
+/**
+ * @brief Convert a string to a 'char**' representing an argument list
+ *
+ * This function takes a string 'var' and converts it into a 'char**'
+ * representing an argument list. The argument list can be consumed by
+ * functions like 'execvp'.
+ *
+ * @param[in] var The string to be converted
+ * @param[in] flags Flags controlling the behavior of the conversion
+ *
+ * @return A 'char**' representing the argument list
+ *
+ * The function uses the 'wordexp' function to perform the conversion. The
+ * 'flags' argument controls the behavior of the 'wordexp' function. The
+ * returned 'char**' is dynamically allocated, and must be freed by the
+ * caller using 'delete[]'.
+ */
+char ** expand_env(const std::string& var, int flags = 0);
+
+
+#endif //LCPEX_STRING_EXPANSION_H