* io.c (rb_io_eof, remain_size, read_all, io_read, appendline)

  (swallow, rb_io_each_byte, rb_io_getc): don't rely EOF flag.
  [ruby-talk:141527]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_8@8433 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

3 files changed, 23 insertions, 10 deletions

diff --git a/ChangeLog b/ChangeLog
index 3e53fe6166..da0406881f 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+Thu May 12 16:15:01 2005  Tanaka Akira  <akr@m17n.org>
+
+	* io.c (rb_io_eof, remain_size, read_all, io_read, appendline)
+	  (swallow, rb_io_each_byte, rb_io_getc): don't rely EOF flag.
+	  [ruby-talk:141527]
+
 Thu May 12 15:56:20 2005  Tilman Sauerbeck <tilman@code-monkey.de>
 
 	* lib/rdoc/parsers/parse_c.rb: show parsing progress for C files.
diff --git a/io.c b/io.c
index 918ebd1f01..9b67d4c615 100644
--- a/io.c
+++ b/io.c
@@ -742,7 +742,6 @@ rb_io_eof(io)
     GetOpenFile(io, fptr);
     rb_io_check_readable(fptr);
 
-    if (feof(fptr->f)) return Qtrue;
     if (READ_DATA_PENDING(fptr->f)) return Qfalse;
     READ_CHECK(fptr->f);
     TRAP_BEG;
@@ -1045,7 +1044,6 @@ remain_size(fptr)
     off_t siz = BUFSIZ;
     off_t pos;
 
-    if (feof(fptr->f)) return 0;
     if (fstat(fileno(fptr->f), &st) == 0  && S_ISREG(st.st_mode)
 #ifdef __BEOS__
 	&& (st.st_dev > 3)
@@ -1086,7 +1084,10 @@ read_all(fptr, siz, str)
 	rb_str_unlocktmp(str);
 	if (n == 0 && bytes == 0) {
 	    if (!fptr->f) break;
-	    if (feof(fptr->f)) break;
+	    if (feof(fptr->f)) {
+		clearerr(fptr->f);
+		break;
+	    }
 	    if (!ferror(fptr->f)) break;
 	    rb_sys_fail(fptr->path);
 	}
@@ -1275,7 +1276,6 @@ io_read(argc, argv, io)
 
     GetOpenFile(io, fptr);
     rb_io_check_readable(fptr);
-    if (feof(fptr->f)) return Qnil;
     if (len == 0) return str;
 
     rb_str_locktmp(str);
@@ -1288,6 +1288,7 @@ io_read(argc, argv, io)
     if (n == 0) {
 	if (!fptr->f) return Qnil;
 	if (feof(fptr->f)) {
+	    clearerr(fptr->f);
 	    rb_str_resize(str, 0);
 	    return Qnil;
 	}
@@ -1365,6 +1366,7 @@ appendline(fptr, delim, strp)
 		    rb_sys_fail(fptr->path);
 		continue;
 	    }
+	    clearerr(fptr->f);
 #ifdef READ_DATA_PENDING_PTR
 	    return c;
 #endif
@@ -1440,6 +1442,9 @@ swallow(fptr, term)
 	    return Qtrue;
 	}
     } while (c != EOF);
+    if (!ferror(f)) {
+	clearerr(f);
+    }
     return Qfalse;
 }
 
@@ -1806,6 +1811,7 @@ rb_io_each_byte(io)
 		    rb_sys_fail(fptr->path);
 		continue;
 	    }
+	    clearerr(f);
 	    break;
 	}
 	rb_yield(INT2FIX(c & 0xff));
@@ -1851,6 +1857,7 @@ rb_io_getc(io)
 		rb_sys_fail(fptr->path);
 	    goto retry;
 	}
+	clearerr(f);
 	return Qnil;
     }
     return INT2FIX(c & 0xff);
diff --git a/test/ruby/ut_eof.rb b/test/ruby/ut_eof.rb
index e6f6eddd6f..b7219ddb51 100644
--- a/test/ruby/ut_eof.rb
+++ b/test/ruby/ut_eof.rb
@@ -6,8 +6,8 @@ module TestEOF
       assert_equal("", f.read(0))
       assert_equal("", f.read(0))
       assert_equal("", f.read)
-      assert_nil(f.read(0))
-      assert_nil(f.read(0))
+      assert_equal("", f.read(0))
+      assert_equal("", f.read(0))
     }
     open_file("") {|f|
       assert_nil(f.read(1))
@@ -43,8 +43,8 @@ module TestEOF
       assert_equal("" , f.read(0))
       assert_equal("" , f.read(0))
       assert_equal("", f.read)
-      assert_nil(f.read(0))
-      assert_nil(f.read(0))
+      assert_equal("", f.read(0))
+      assert_equal("", f.read(0))
     }
     open_file("a") {|f|
       assert_equal("a", f.read(1))
@@ -69,7 +69,7 @@ module TestEOF
     }
     open_file("a") {|f|
       assert_equal("a", f.read)
-      assert_nil(f.read(0))
+      assert_equal("", f.read(0))
     }
     open_file("a") {|f|
       s = "x"
@@ -109,7 +109,7 @@ module TestEOF
         assert_equal(10, f.pos)
         assert_equal("", f.read(0))
         assert_equal("", f.read)
-        assert_nil(f.read(0))
+        assert_equal("", f.read(0))
         assert_equal("", f.read)
       }
     end