Replace long with int64_t in exiv2app.hpp

app/app_utils.cpp

@@ -1,19 +1,26 @@
 // SPDX-License-Identifier: GPL-2.0-or-later
 
+#include "app_utils.hpp"
 #include <climits>
 #include <cstdlib>
+#include <limits>
 
 namespace Util {
-bool strtol(const char* nptr, long& n) {
+bool strtol(const char* nptr, int64_t& n) {
   if (!nptr || *nptr == '\0')
     return false;
   char* endptr = nullptr;
-  long tmp = std::strtol(nptr, &endptr, 10);
+  long long tmp = std::strtoll(nptr, &endptr, 10);
   if (*endptr != '\0')
     return false;
-  if (tmp == LONG_MAX || tmp == LONG_MIN)
+  // strtoll returns LLONG_MAX or LLONG_MIN if an overflow occurs.
+  if (tmp == LLONG_MAX || tmp == LLONG_MIN)
     return false;
-  n = tmp;
+  if (tmp < std::numeric_limits<int64_t>::min())
+    return false;
+  if (tmp > std::numeric_limits<int64_t>::max())
+    return false;
+  n = static_cast<int64_t>(tmp);
   return true;
 }