handling parsing exceptions and check for error creating a backup

tools/json/reformat-json.cpp

@@ -4,6 +4,7 @@
 #include <cerrno>
 #include <cstdio>
 #include <string>
+#include <exception>
 
 using json = LAMMPS_NS::json;
 
@@ -28,20 +29,28 @@ int main(int argc, char **argv)
       return 2;
     }
 
+    try {
       auto jsondata = json::parse(fp, nullptr, true, true);
       fclose(fp);
-
+      if (rename(file.c_str(), backup.c_str())) {
-    rename(file.c_str(), backup.c_str());
+        printf("Cannot create backup for file %s: %s\n", file.c_str(), strerror(errno));
+        return 3;
+      }
 
       fp = fopen(file.c_str(), "w");
       if (!fp) {
         printf("Cannot open file %s for writing: %s\n", file.c_str(), strerror(errno));
-      return 3;
+        return 4;
       }
       std::string data = jsondata.dump(indent);
       data += '\n';
       fputs(data.c_str(), fp);
       fclose(fp);
+    } catch (std::exception &e) {
+      printf("%s: %s\nSkipping file...\n", argv[i], e.what());
+      fclose(fp);
+    }
+
   }
   return 0;
 }