[BZ #6544]

	* libio/fmemopen.c: Implement binary mode.  In this mode no NUL
	byte gets added to writes and seeks from the end use the length of
	the buffer and not the currently terminating NUL byte.

diff --git a/ChangeLog b/ChangeLog
index 0975959dec12901164f512f19d31aba5575db9cf..2415c65541421a564a2f97701bb08e2b514989ab 100644 (file)
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,10 @@
 2008-08-13  Ulrich Drepper  <drepper@redhat.com>
 
+       [BZ #6544]
+       * libio/fmemopen.c: Implement binary mode.  In this mode no NUL
+       byte gets added to writes and seeks from the end use the length of
+       the buffer and not the currently terminating NUL byte.
+
        [BZ #6634]
        * login/utmp_file.c (getutent_r_file): Take additional parameter.
        Set to true if locking failed.

diff --git a/NEWS b/NEWS
index fd7f7c9151c4d6083352e4c31a3f332ad47627d4..c3ceaba42e649dc5fd0007bacb1a01ab2540719a 100644 (file)
--- a/NEWS
+++ b/NEWS
@@ -28,6 +28,11 @@ Version 2.9
 * Implement "e" option for popen to open file descriptor with the
   close-on-exec flag set.  Implemented by Ulrich Drepper.
 
+* Implement "b" mode for fmemopen.  In this mode writes writes don't
+  implicitly add a NUL byte and seeks from the end of the buffer really
+  use the buffer end, not the string length as the basis.
+  Implemented by Ulrich Drepper.
+
 * Many functions, exported and internal, now atomically set the close-on-exec
   flag when run on a sufficiently new kernel.  Implemented by Ulrich Drepper.
 

diff --git a/libio/fmemopen.c b/libio/fmemopen.c
index f3b280092cb18e110ae32b4b719dc5bb037711ef..b618ce585d95412c555efd2c35c3f04a4c6545e3 100644 (file)
--- a/libio/fmemopen.c
+++ b/libio/fmemopen.c
@@ -1,7 +1,7 @@
 /* Fmemopen implementation.
-   Copyright (C) 2000, 2002, 2005, 2006 Free Software Foundation, Inc.
+   Copyright (C) 2000, 2002, 2005, 2006, 2008 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
-   Contributed by  Hanno Mueller, kontakt@hanno.de, 2000.
+   Contributed by Hanno Mueller, kontakt@hanno.de, 2000.
 
    The GNU C Library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
@@ -82,6 +82,7 @@ struct fmemopen_cookie_struct
 {
   char *buffer;
   int mybuffer;
+  int binmode;
   size_t size;
   _IO_off64_t pos;
   size_t maxpos;
@@ -120,7 +121,7 @@ fmemopen_write (void *cookie, const char *b, size_t s)
 
   c = (fmemopen_cookie_t *) cookie;
 
-  addnullc = s == 0 || b[s - 1] != '\0';
+  addnullc = c->binmode == 0 && (s == 0 || b[s - 1] != '\0');
 
   if (c->pos + s + addnullc > c->size)
     {
@@ -165,7 +166,7 @@ fmemopen_seek (void *cookie, _IO_off64_t *p, int w)
       break;
 
     case SEEK_END:
-      np = c->maxpos - *p;
+      np = (c->binmode ? c->size : c->maxpos) - *p;
       break;
 
     default:
@@ -248,6 +249,8 @@ fmemopen (void *buf, size_t len, const char *mode)
   else
     c->pos = 0;
 
+  c->binmode = mode[0] != '\0' && mode[1] == 'b';
+
   iof.read = fmemopen_read;
   iof.write = fmemopen_write;
   iof.seek = fmemopen_seek;