string util

1 files changed, 38 insertions, 0 deletions

diff --git a/src/util/string.cc b/src/util/string.cc
new file mode 100644
index 0000000..8c6c86a
--- /dev/null
+++ b/src/util/string.cc
@@ -0,0 +1,38 @@
+#include "util/string.h"
+
+namespace ov4
+{
+
+using namespace std;
+
+void string2argv(const vector<string> * const s, char **argv)
+{
+
+    // pointers [0, size)
+    // nullptr [size]
+    // data  [size+1, ...)
+
+    char *p = (char*)(argv + s->size() + 1);
+
+    argv[s->size()] = nullptr;
+
+    for (size_t i = 0; i < s->size(); i++)
+    {
+        strcpy(p, (*s)[i].c_str());
+        argv[i] = p;
+        p += (*s)[i].size() + 1; // for '\0'
+    }
+}
+
+void argv2string(vector<string> *s, const char * const * argv)
+{
+    if (argv == nullptr) return; 
+    
+    for (size_t i = 0; true; i++)
+    {
+        if (argv[i] == nullptr) return;
+        s->push_back(argv[i]);
+    }
+}
+
+}