@@ -43,7 +43,7 @@ class GzipFile : boost::noncopyable
   int write(StringPiece buf) { return ::gzwrite(file_, buf.data(), buf.size()); }
 
   // number of uncompressed bytes
-  long tell() const { return ::gztell(file_); }
+  off_t tell() const { return ::gztell(file_); }
 
 #if ZLIB_VERNUM >= 0x1240
   // number of compressed bytes
 
@@ -9,9 +9,9 @@ int main()
   muduo::GzipFile writer = muduo::GzipFile::openForAppend(filename);
   if (writer.valid())
   {
-    printf("tell %ld\n", writer.tell());
+    printf("tell %ld\n", static_cast<long>(writer.tell()));
     printf("wrote %d\n", writer.write(data));
-    printf("tell %ld\n", writer.tell());
+    printf("tell %ld\n", static_cast<long>(writer.tell()));
   }
   }
 
@@ -21,15 +21,15 @@ int main()
   if (reader.valid())
   {
     char buf[256];
-    printf("tell %ld\n", reader.tell());
+    printf("tell %ld\n", static_cast<long>(reader.tell()));
     int nr = reader.read(buf, sizeof buf);
     printf("read %d\n", nr);
     if (nr >= 0)
     {
       buf[nr] = '\0';
       printf("data %s", buf);
     }
-    printf("tell %ld\n", reader.tell());
+    printf("tell %ld\n", static_cast<long>(reader.tell()));
     if (strncmp(buf, data, strlen(data)) != 0)
     {
       printf("failed!!!\n");
Original file line number	Diff line number	Diff line change
`@@ -9,9 +9,9 @@ int main()`
`9`	`9`	`muduo::GzipFile writer = muduo::GzipFile::openForAppend(filename);`
`10`	`10`	`if (writer.valid())`
`11`	`11`	`{`
`12`		`- printf("tell %ld\n", writer.tell());`
	`12`	`+ printf("tell %ld\n", static_cast<long>(writer.tell()));`
`13`	`13`	`printf("wrote %d\n", writer.write(data));`
`14`		`- printf("tell %ld\n", writer.tell());`
	`14`	`+ printf("tell %ld\n", static_cast<long>(writer.tell()));`
`15`	`15`	`}`
`16`	`16`	`}`
`17`	`17`
`@@ -21,15 +21,15 @@ int main()`
`21`	`21`	`if (reader.valid())`
`22`	`22`	`{`
`23`	`23`	`char buf[256];`
`24`		`- printf("tell %ld\n", reader.tell());`
	`24`	`+ printf("tell %ld\n", static_cast<long>(reader.tell()));`
`25`	`25`	`int nr = reader.read(buf, sizeof buf);`
`26`	`26`	`printf("read %d\n", nr);`
`27`	`27`	`if (nr >= 0)`
`28`	`28`	`{`
`29`	`29`	`buf[nr] = '\0';`
`30`	`30`	`printf("data %s", buf);`
`31`	`31`	`}`
`32`		`- printf("tell %ld\n", reader.tell());`
	`32`	`+ printf("tell %ld\n", static_cast<long>(reader.tell()));`
`33`	`33`	`if (strncmp(buf, data, strlen(data)) != 0)`
`34`	`34`	`{`
`35`	`35`	`printf("failed!!!\n");`