Changeset 1965 in Sophya for trunk/Eval

Timestamp:

Apr 25, 2002, 1:05:56 AM (23 years ago)

Author:

ansari

Message:

amelioration du programme test/check seekg() sur iostream - Reza 25/4/2002

File:

• trunk/Eval/COS/tios.cc (modified) (7 diffs)

trunk/Eval/COS/tios.cc

@@ -9 +9 @@
 void twrite(ostream* s);
 
+// -----------------------------------------------------
+// This test program illustrates the problem with g++
+//  (pb with g++ 2.95 3.0) 
+// iostream library with seekg(..., ios::end)
+// # compile the program 
+// csh> g++ -o tios tios.cc
+// # Create the test data file tios.dat
+// csh> ./tios w
+// # Read with seekg(... ios::end) ---> wrong result
+// csh> ./tios r 
+// # seekg(... ios::beg) works OK 
+// csh> ./tios r2
+// ----------------------------------------------------
+
 int main(int narg, char ** arg)
 {
@@ -14 +28 @@
   cout << "Usage: tios w/r/r2 \n" 
        << "  w  : Write data file tios.cc \n" 
-       << "  r  : Read data file with seekg(ios::end)  -> Linux Pb \n"
-       << "  r2 : Read  data file with seekg(ios::beg) Linux OK (??) \n" << endl;
+       << "  r  : Read data file with seekg(ios::end)  -> g++/Linux Pb \n"
+       << "  r2 : Read  data file with seekg(ios::beg) g++/Linux OK  \n" << endl;
   exit(0);
   }
@@ -71 +85 @@
 
 cout << " ----- Check Output from here ------- " << endl;
-s->seekg(-(sizeof(int)+sizeof(float)+sizeof(double)), ios::end);
-pos = s->tellg();
-s->read((char *)(&iv), sizeof(int));
-s->read((char *)(&fv), sizeof(float));
-s->read((char *)(&dv), sizeof(double));
-i = 9;
-cout << "Seek-tread " << i << " IV= " << iv << " FV= " << fv << " DV= " << dv 
-     << " Pos= " << pos << endl;
+for(i=0; i<4; i++) {
+  s->seekg(-i*(sizeof(int)+sizeof(float)+sizeof(double)), ios::end);
+  pos = s->tellg();
+  s->read((char *)(&iv), sizeof(int));
+  s->read((char *)(&fv), sizeof(float));
+  s->read((char *)(&dv), sizeof(double));
+  cout << "Seek-tread-end " << " IV= " << iv << " FV= " << fv << " DV= " << dv 
+       << " Pos= " << pos << endl;
+}
 s->seekg((sizeof(int)+sizeof(float)+sizeof(double)), ios::beg);
 pos = s->tellg();
@@ -84 +99 @@
 s->read((char *)(&fv), sizeof(float));
 s->read((char *)(&dv), sizeof(double));
-i = 1;
-cout << "Seek-tread2 " << i << " IV= " << iv << " FV= " << fv << " DV= " << dv 
+cout << "Seek-tread-begin " << " IV= " << iv << " FV= " << fv << " DV= " << dv 
      << " Pos= " << pos << endl;
 
@@ -97 +111 @@
 double dv;
 long pos;
-for(i=0; i<7; i++) {
+for(i=0; i<10; i++) {
   pos = s->tellg();
   s->read((char *)(&iv), sizeof(int));
@@ -107 +121 @@
 
 cout << " ----- Check Output from here ------- " << endl;
+for(i=1; i<5; i+=2) {
+  s->seekg(i*(sizeof(int)+sizeof(float)+sizeof(double)), ios::beg);
+  pos = s->tellg();
+  s->read((char *)(&iv), sizeof(int));
+  s->read((char *)(&fv), sizeof(float));
+  s->read((char *)(&dv), sizeof(double));
+  
+  cout << "Seek-tread2-begin " << " IV= " << iv << " FV= " << fv 
+       << " DV= " << dv << " Pos= " << pos << endl;
+ }
+
 s->seekg(0, ios::end);
 pos = s->tellg();
@@ -118 +143 @@
 s->read((char *)(&dv), sizeof(double));
 i = 9;
-cout << "Seek-tread2 " << i << " IV= " << iv << " FV= " << fv << " DV= " << dv 
+cout << "Seek-tread2-begin " << " IV= " << iv << " FV= " << fv << " DV= " << dv 
      << " Pos= " << pos << endl;
 
 
-s->seekg((sizeof(int)+sizeof(float)+sizeof(double)), ios::beg);
-for(i=1; i<3; i++) {
-  pos = s->tellg();
-  s->read((char *)(&iv), sizeof(int));
-  s->read((char *)(&fv), sizeof(float));
-  s->read((char *)(&dv), sizeof(double));
-  
-  cout << "Seek-tread2-2 " << i << " IV= " << iv << " FV= " << fv 
-       << " DV= " << dv << " Pos= " << pos << endl;
- }
 }