Update.

2002-01-19  Ulrich Drepper  <drepper@redhat.com>

	* libio/fileops.c (_IO_file_underflow_mmap): Don't define as static.
	Set offset if read end wasn't the buffer end.
	(_IO_file_seekoff_mmap): New function.
	(_IO_file_xsgetn_mmap): New function.
	(_IO_file_jumps_mmap): Use the two new functions.
	* libio/wfileops.c (_IO_wfile_underflow_mmap): Handle end read buffer
	!= end buffer.
	* libio/libioP.h: Declare _IO_file_seekoff_mmap and
	_IO_file_underflow_mmap.
	* libio/iofopen.c: Don't position file descriptor at end of file.
	* libio/tst-widetext.c: Improve error messages.
	* stdio-common/tst-rndseek.c: Likewise.

5 files changed, 130 insertions, 55 deletions

diff --git a/libio/fileops.c b/libio/fileops.c
index 32fa524507..60481b1af4 100644
--- a/libio/fileops.c
+++ b/libio/fileops.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1993, 1995, 1997-2000, 2001 Free Software Foundation, Inc.
+/* Copyright (C) 1993, 1995, 1997-2001, 2002 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
    Written by Per Bothner <bothner@cygnus.com>.
 
@@ -33,6 +33,7 @@
 #include "libioP.h"
 #include <assert.h>
 #include <fcntl.h>
+#include <sys/param.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <string.h>
@@ -558,7 +559,7 @@ _IO_new_file_underflow (fp)
 
 /* Special callback replacing the underflow callbacks if we mmap the
    file.  */
-static int
+int
 _IO_file_underflow_mmap (_IO_FILE *fp)
 {
   if (fp->_IO_read_end < fp->_IO_buf_end)
@@ -576,6 +577,7 @@ _IO_file_underflow_mmap (_IO_FILE *fp)
 	  return EOF;
 	}
 
+      fp->_offset = fp->_IO_buf_end - fp->_IO_buf_base;
       fp->_IO_read_end = fp->_IO_buf_end;
       return *fp->_IO_read_ptr;
     }
@@ -857,6 +859,52 @@ resync:
   return offset;
 }
 
+_IO_off64_t
+_IO_file_seekoff_mmap (fp, offset, dir, mode)
+     _IO_FILE *fp;
+     _IO_off64_t offset;
+     int dir;
+     int mode;
+{
+  _IO_off64_t result;
+
+  if (mode == 0)
+    dir = _IO_seek_cur, offset = 0; /* Don't move any pointers. */
+
+  switch (dir)
+    {
+    case _IO_seek_cur:
+      /* Adjust for read-ahead (bytes is buffer). */
+      offset += fp->_IO_read_ptr - fp->_IO_read_base;
+      break;
+    case _IO_seek_set:
+      break;
+    case _IO_seek_end:
+      offset = fp->_IO_read_end - fp->_IO_read_base + offset;
+      break;
+    }
+  /* At this point, dir==_IO_seek_set. */
+
+  if (offset < 0)
+    /* No negative offsets are valid.  */
+    return EOF;
+
+  /* If we are only interested in the current position we've found it now.  */
+  if (mode == 0)
+    return offset;
+
+  result = _IO_SYSSEEK (fp, offset, 0);
+  if (result < 0)
+    return EOF;
+
+  _IO_setg (fp, fp->_IO_buf_base, fp->_IO_buf_base + offset,
+	    fp->_IO_buf_base + offset);
+
+  _IO_mask_flags (fp, 0, _IO_EOF_SEEN);
+
+  return offset;
+}
+
 _IO_ssize_t
 _IO_file_read (fp, buf, size)
      _IO_FILE *fp;
@@ -1122,6 +1170,39 @@ _IO_file_xsgetn (fp, data, n)
   return n - want;
 }
 
+static _IO_size_t _IO_file_xsgetn_mmap __P ((_IO_FILE *, void *, _IO_size_t));
+static _IO_size_t
+_IO_file_xsgetn_mmap (fp, data, n)
+     _IO_FILE *fp;
+     void *data;
+     _IO_size_t n;
+{
+  register _IO_size_t have;
+  char *read_ptr = fp->_IO_read_ptr;
+
+  have = fp->_IO_read_end - fp->_IO_read_ptr;
+
+  if (have < n)
+    {
+      /* Maybe the read buffer is not yet fully set up.  */
+      fp->_IO_read_ptr = fp->_IO_read_end;
+      if (fp->_IO_read_end < fp->_IO_buf_end
+	  && _IO_file_underflow_mmap (fp) != EOF)
+	have = fp->_IO_read_end - read_ptr;
+    }
+
+  if (have == 0)
+    fp->_flags |= _IO_EOF_SEEN;
+  else
+    {
+      have = MIN (have, n);
+      memcpy (data, read_ptr, have);
+      fp->_IO_read_ptr = read_ptr + have;
+    }
+
+  return have;
+}
+
 struct _IO_jump_t _IO_file_jumps =
 {
   JUMP_INIT_DUMMY,
@@ -1155,8 +1236,8 @@ struct _IO_jump_t _IO_file_jumps_mmap =
   JUMP_INIT(uflow, _IO_default_uflow),
   JUMP_INIT(pbackfail, _IO_default_pbackfail),
   JUMP_INIT(xsputn, _IO_new_file_xsputn),
-  JUMP_INIT(xsgetn, _IO_file_xsgetn),
-  JUMP_INIT(seekoff, _IO_new_file_seekoff),
+  JUMP_INIT(xsgetn, _IO_file_xsgetn_mmap),
+  JUMP_INIT(seekoff, _IO_file_seekoff_mmap),
   JUMP_INIT(seekpos, _IO_default_seekpos),
   JUMP_INIT(setbuf, _IO_new_file_setbuf),
   JUMP_INIT(sync, _IO_new_file_sync),
diff --git a/libio/iofopen.c b/libio/iofopen.c
index e4821cbf0e..e3b9838195 100644
--- a/libio/iofopen.c
+++ b/libio/iofopen.c
@@ -67,25 +67,12 @@ __fopen_maybe_mmap (fp)
 # endif
 	  if (p != MAP_FAILED)
 	    {
-	      if (
-# ifdef _G_LSEEK64
-		  _G_LSEEK64 (fp->_fileno, st.st_size, SEEK_SET)
-# else
-		  __lseek (fp->_fileno, st.st_size, SEEK_SET)
-# endif
-		  != st.st_size)
-		{
-		  /* We cannot search the file.  Don't mmap then.  */
-		  __munmap (p, st.st_size);
-		  return fp;
-		}
-
 	      /* OK, we managed to map the file.  Set the buffer up
 		 and use a special jump table with simplified
 		 underflow functions which never tries to read
 		 anything from the file.  */
 	      _IO_setb (fp, p, (char *) p + st.st_size, 0);
-	      _IO_setg (fp, p, p, (char *) p + st.st_size);
+	      _IO_setg (fp, p, p, p);
 
 	      if (fp->_mode <= 0)
 		_IO_JUMPS ((struct _IO_FILE_plus *) fp) = &_IO_file_jumps_mmap;
@@ -93,7 +80,7 @@ __fopen_maybe_mmap (fp)
 		_IO_JUMPS ((struct _IO_FILE_plus *) fp) = &_IO_wfile_jumps_mmap;
 	      fp->_wide_data->_wide_vtable = &_IO_wfile_jumps_mmap;
 
-	      fp->_offset = st.st_size;
+	      fp->_offset = 0;
 	    }
 	}
     }
diff --git a/libio/libioP.h b/libio/libioP.h
index f9f44cc0d3..e25a6e7ef1 100644
--- a/libio/libioP.h
+++ b/libio/libioP.h
@@ -1,4 +1,4 @@
-/* Copyright (C) 1993,1997,1998,1999,2000,2001 Free Software Foundation, Inc.
+/* Copyright (C) 1993, 1997-2001, 2002 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -486,12 +486,15 @@ extern int _IO_old_fsetpos64 __P ((_IO_FILE *, const _IO_fpos64_t *));
 extern int _IO_file_doallocate __P ((_IO_FILE *));
 extern _IO_FILE* _IO_file_setbuf __P ((_IO_FILE *, char *, _IO_ssize_t));
 extern _IO_off64_t _IO_file_seekoff __P ((_IO_FILE *, _IO_off64_t, int, int));
+extern _IO_off64_t _IO_file_seekoff_mmap __P ((_IO_FILE *, _IO_off64_t, int,
+					       int));
 extern _IO_size_t _IO_file_xsputn __P ((_IO_FILE *, const void *, _IO_size_t));
 extern _IO_size_t _IO_file_xsgetn __P ((_IO_FILE *, void *, _IO_size_t));
 extern int _IO_file_stat __P ((_IO_FILE *, void *));
 extern int _IO_file_close __P ((_IO_FILE *));
 extern int _IO_file_close_mmap __P ((_IO_FILE *));
 extern int _IO_file_underflow __P ((_IO_FILE *));
+extern int _IO_file_underflow_mmap __P ((_IO_FILE *));
 extern int _IO_file_overflow __P ((_IO_FILE *, int));
 #define _IO_file_is_open(__fp) ((__fp)->_fileno != -1)
 extern void _IO_file_init __P ((struct _IO_FILE_plus *));
diff --git a/libio/tst-widetext.c b/libio/tst-widetext.c
index 3842403885..7a98f641be 100644
--- a/libio/tst-widetext.c
+++ b/libio/tst-widetext.c
@@ -1,6 +1,6 @@
 /* Test program for the wide character stream functions handling larger
    amounts of text.
-   Copyright (C) 2000 Free Software Foundation, Inc.
+   Copyright (C) 2000, 2002 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
    Contributed by Ulrich Drepper <drepper@cygnus.com>.
 
@@ -212,7 +212,7 @@ main (void)
       /* Make sure there is nothing left.  */
       if (fgetc (fp) != EOF)
 	{
-	  printf ("%Zd: more input avilable", __LINE__);
+	  printf ("%Zd: more input available\n", __LINE__);
 	  status = 1;
 	}
 
@@ -347,7 +347,7 @@ main (void)
       /* Make sure there is nothing left.  */
       if (fgetc (fp) != EOF)
 	{
-	  printf ("%Zd: more input avilable", __LINE__);
+	  printf ("%Zd: more input available\n", __LINE__);
 	  status = 1;
 	}
 
diff --git a/libio/wfileops.c b/libio/wfileops.c
index 35d201b939..54624f0a61 100644
--- a/libio/wfileops.c
+++ b/libio/wfileops.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1993,95,97,98,99,2000,2001 Free Software Foundation, Inc.
+/* Copyright (C) 1993,95,97,98,99,2000,2001,2002 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
    Written by Ulrich Drepper <drepper@cygnus.com>.
    Based on the single byte version by Per Bothner <bothner@cygnus.com>.
@@ -313,6 +313,7 @@ _IO_wfile_underflow_mmap (_IO_FILE *fp)
 {
   struct _IO_codecvt *cd;
   enum __codecvt_result status;
+  const char *read_stop;
 
   if (__builtin_expect (fp->_flags & _IO_NO_READS, 0))
     {
@@ -326,45 +327,48 @@ _IO_wfile_underflow_mmap (_IO_FILE *fp)
   cd = fp->_codecvt;
 
   /* Maybe there is something left in the external buffer.  */
-  if (fp->_IO_read_ptr < fp->_IO_read_end)
+  if (fp->_IO_read_ptr >= fp->_IO_read_end
+      /* No.  But maybe the read buffer is not fully set up.  */
+      && _IO_file_underflow_mmap (fp) == EOF)
     {
-      /* There is more in the external.  Convert it.  */
-      const char *read_stop = (const char *) fp->_IO_read_ptr;
+      /* Nothing available.  */
+      fp->_flags |= _IO_EOF_SEEN;
+      return WEOF;
+    }
+
+  /* There is more in the external.  Convert it.  */
+  read_stop = (const char *) fp->_IO_read_ptr;
 
-      if (fp->_wide_data->_IO_buf_base == NULL)
+  if (fp->_wide_data->_IO_buf_base == NULL)
+    {
+      /* Maybe we already have a push back pointer.  */
+      if (fp->_wide_data->_IO_save_base != NULL)
 	{
-	  /* Maybe we already have a push back pointer.  */
-	  if (fp->_wide_data->_IO_save_base != NULL)
-	    {
-	      free (fp->_wide_data->_IO_save_base);
-	      fp->_flags &= ~_IO_IN_BACKUP;
-	    }
-	  _IO_wdoallocbuf (fp);
+	  free (fp->_wide_data->_IO_save_base);
+	  fp->_flags &= ~_IO_IN_BACKUP;
 	}
+      _IO_wdoallocbuf (fp);
+    }
 
-      fp->_wide_data->_IO_last_state = fp->_wide_data->_IO_state;
-      fp->_wide_data->_IO_read_base = fp->_wide_data->_IO_read_ptr =
-	fp->_wide_data->_IO_buf_base;
-      status = (*cd->__codecvt_do_in) (cd, &fp->_wide_data->_IO_state,
-				       fp->_IO_read_ptr, fp->_IO_read_end,
-				       &read_stop,
-				       fp->_wide_data->_IO_read_ptr,
-				       fp->_wide_data->_IO_buf_end,
-				       &fp->_wide_data->_IO_read_end);
-
-      fp->_IO_read_ptr = (char *) read_stop;
+  fp->_wide_data->_IO_last_state = fp->_wide_data->_IO_state;
+  fp->_wide_data->_IO_read_base = fp->_wide_data->_IO_read_ptr =
+    fp->_wide_data->_IO_buf_base;
+  status = (*cd->__codecvt_do_in) (cd, &fp->_wide_data->_IO_state,
+				   fp->_IO_read_ptr, fp->_IO_read_end,
+				   &read_stop,
+				   fp->_wide_data->_IO_read_ptr,
+				   fp->_wide_data->_IO_buf_end,
+				   &fp->_wide_data->_IO_read_end);
 
-      /* If we managed to generate some text return the next character.  */
-      if (fp->_wide_data->_IO_read_ptr < fp->_wide_data->_IO_read_end)
-	return *fp->_wide_data->_IO_read_ptr;
+  fp->_IO_read_ptr = (char *) read_stop;
 
-      /* There is some garbage at the end of the file.  */
-      __set_errno (EILSEQ);
-      fp->_flags |= _IO_ERR_SEEN;
-      return WEOF;
-    }
+  /* If we managed to generate some text return the next character.  */
+  if (fp->_wide_data->_IO_read_ptr < fp->_wide_data->_IO_read_end)
+    return *fp->_wide_data->_IO_read_ptr;
 
-  fp->_flags |= _IO_EOF_SEEN;
+  /* There is some garbage at the end of the file.  */
+  __set_errno (EILSEQ);
+  fp->_flags |= _IO_ERR_SEEN;
   return WEOF;
 }