rlottie/exampe: add correct implementation of basename()

example/lottie2gif.cpp

@@ -84,7 +84,7 @@ public:
         auto buffer = std::unique_ptr<uint32_t[]>(new uint32_t[w * h]);
         size_t frameCount = player->totalFrame();
 
-        GifBuilder builder(baseName.data(), w, h, bgColor);
+        GifBuilder builder(gifName.data(), w, h, bgColor);
         for (size_t i = 0; i < frameCount ; i++) {
             rlottie::Surface surface(buffer.get(), w, h, w * 4);
             player->renderSync(i, surface);
@@ -108,24 +108,25 @@ public:
 
         if (!fileName || !jsonFile(fileName) ) return help();
 
-        baseName = absoloutePath;
-#ifdef _WIN32
-        char *base = strrchr(baseName.data(), '\\');
-        if (base)
-        {
-            base++;
-            base = strrchr(baseName.data(), '\\');
-            if (base) base++;
-            else return 1;
-        }
-#else
-        char *base = basename(baseName.data());
-#endif
-        snprintf(baseName.data(), baseName.size(), "%s.gif",base);
+        gifName = basename(fileName);
+        gifName.append(".gif");
         return 0;
     }
 
 private:
+    std::string basename(const std::string &str)
+    {
+        if (str.empty()) return {};
+
+        auto ptr = str.c_str();
+        auto pos = str.size();
+        while (--pos) {
+            if ( ptr[pos] == '/' || ptr[pos] == '\\') {
+                return str.substr(pos+1);
+            }
+        }
+        return str;
+    }
 
     bool jsonFile(const char *filename) {
       const char *dot = strrchr(filename, '.');
@@ -134,7 +135,7 @@ private:
     }
 
     int result() {
-        std::cout<<"Generated GIF file : "<<baseName.data()<<std::endl;
+        std::cout<<"Generated GIF file : "<<gifName<<std::endl;
         return 0;
     }
 
@@ -147,7 +148,7 @@ private:
     char *fileName{nullptr};
     int bgColor = 0xffffffff;
     std::array<char, 5000> absoloutePath;
-    std::array<char, 5000> baseName;
+    std::string gifName;
 };
 
 int