!3716 Adapt the eof of Euler OS

Merge pull request !3716 from jiangzhiwen/dataset/adapt_eof

mindspore/ccsrc/minddata/dataset/engine/datasetops/source/csv_op.cc

@@ -411,7 +411,10 @@ Status CsvOp::LoadFile(const std::string &file, const int64_t start_offset, cons
   csv_parser.Reset();
   try {
     while (ifs.good()) {
-      char chr = ifs.get();
+      // when ifstream reachs the end of file, the function get() return std::char_traits<char>::eof()
+      // which is a 32-bit -1, it's not equal to the 8-bit -1 on Euler OS. So instead of char, we use
+      // int to receive its return value.
+      int chr = ifs.get();
       if (csv_parser.processMessage(chr) != 0) {
         RETURN_STATUS_UNEXPECTED("Failed to parse file " + file + ":" + std::to_string(csv_parser.total_rows_ + 1) +
                                  ". error message: " + csv_parser.err_message_);

mindspore/ccsrc/minddata/dataset/engine/datasetops/source/csv_op.h

@@ -95,7 +95,7 @@ class CsvOp : public ParallelOp {
 
     void setEndOffset(int64_t end_offset) { end_offset_ = end_offset; }
 
-    int processMessage(char c) {
+    int processMessage(int c) {
       Message m = getMessage(c);
       StateDiagram::iterator it = sd.find({cur_state_, m});
       if (it == sd.end()) {
@@ -132,7 +132,7 @@ class CsvOp : public ParallelOp {
     typedef std::pair<State, std::function<int(CsvParser &, char)>> StateActionPair;
     typedef std::map<StateMessagePair, StateActionPair> StateDiagram;
 
-    Message getMessage(char c) {
+    Message getMessage(int c) {
       if (c == csv_field_delim_) {
         return Message::MS_DELIM;
       } else if (c == '"') {