/[magellan-source]/trunk/mkinitrd-magellan/busybox/TODO

Diff of /trunk/mkinitrd-magellan/busybox/TODO

Parent Directory | Revision Log | View Patch Patch

-revision 1122 by niro,
Sun May 30 11:32:42 2010 UTC
+revision 1123 by niro,
Wed Aug 18 21:56:57 2010 UTC
 Line 1
  Busybox TODO
+ Harvest patches from
+ http://git.openembedded.org/cgit.cgi/openembedded/tree/recipes/busybox/
  Stuff that needs to be done.  This is organized by who plans to get around to
  doing it eventually, but that doesn't mean they "own" the item.  If you want to
  do one of these bounce an email off the person it's listed under to see if they
-Line 9 
 between your work and theirs.  But other
+Line 12 
 between your work and theirs.  But other
  Rob Landley suggested this:
    Implement bb_realpath() that can handle NULL on non-glibc.
-   Remove obsolete _() wrapper crud for internationalization we don't do.
-   Figure out where we need utf8 support, and add it.
    sh
      The command shell situation is a mess.  We have two different
      shells that don't really share any code, and the "standalone shell" doesn't
 Line 31 
 Rob Landley suggested this:
      How much internationalization should we do?
      The low hanging fruit is UTF-8 character set support.  We should do this.
-     (Vodz pointed out the shell's cmdedit as needing work here.  What else?)
+     See TODO_unicode file.
      We also have lots of hardwired english text messages.  Consolidating this
      into some kind of message table not only makes translation easier, but
 Line 59 
 Rob Landley suggested this:
      Turning libbb into a real dll is another possibility, especially if libbb
      could export some of the other library interfaces we've already more or less
      got the code for (like zlib).
    buildroot - Make a "dogfood" option
      Busybox 1.1 will be capable of replacing most gnu packages for real world
      use, such as developing software or in a live CD.  It needs wider testing.
-Line 78 
 Rob Landley suggested this:
+Line 79 
 Rob Landley suggested this:
      One example of an existing system that does this already is Firmware Linux:
        http://www.landley.net/code/firmware
    initramfs
      Busybox should have a sample initramfs build script.  This depends on
      bbsh, mdev, and switch_root.
    mkdep
      Write a mkdep that doesn't segfault if there's a directory it doesn't
      have permission to read, isn't based on manually editing the output of
      lexx and yacc, doesn't make such a mess under include/config, etc.
    Group globals into unions of structures.
      Go through and turn all the global and static variables into structures,
      and have all those structures be in a big union shared between processes,
      so busybox uses less bss.  (This is a big win on nommu machines.)  See
      sed.c and mdev.c for examples.
    Go through bugs.busybox.net and close out all of that somehow.
      This one's open to everybody, but I'll wind up doing it...
  Bernhard Reutner-Fischer <busybox@busybox.net> suggests to look at these:
    New debug options:
      -Wlarger-than-127
-Line 122 
 patch
+Line 126 
 patch
    And while we're at it, a new patch filename quoting format is apparently
    coming soon:  http://marc.theaimsgroup.com/?l=git&m=112927316408690&w=2
  ---
- ar
-   Write support!
- ---
  stty / catv
    stty's visible() function and catv's guts are identical. Merge them into
    an appropriate libbb function.
-Line 180 
 Memory Allocation
+Line 181 
 Memory Allocation
    call free might also be optimized out by the compiler if written right, so
    we can yank those #ifdefs too, and generally clean up the code.
  ---
- Switch CONFIG_SYMBOLS to ENABLE_SYMBOLS
-   In busybox 1.0 and earlier, configuration was done by CONFIG_SYMBOLS
-   that were either defined or undefined to indicate whether the symbol was
-   selected in the .config file.  They were used with #ifdefs, ala:
-     #ifdef CONFIG_SYMBOL
-       if (other_test) {
-         do_code();
-       }
-     #endif
-   In 1.1, we have new ENABLE_SYMBOLS which are always defined (as 0 or 1),
-   meaning you can still use them for preprocessor tests by replacing
-   "#ifdef CONFIG_SYMBOL" with "#if ENABLE_SYMBOL".  But more importantly, we
-   can use them as a true or false test in normal C code:
-     if (ENABLE_SYMBOL && other_test) {
-       do_code();
-     }
-   (Optimizing away if() statements that resolve to a constant value
-   is known as "dead code elimination", an optimization so old and simple that
-   Turbo Pascal for DOS did it twenty years ago.  Even modern mini-compilers
-   like the Tiny C Compiler (tcc) and the Small Device C Compiler (SDCC)
-   perform dead code elimination.)
-   Right now, busybox.h is #including both "config.h" (defining the
-   CONFIG_SYMBOLS) and "bb_config.h" (defining the ENABLE_SYMBOLS).  At some
-   point in the future, it would be nice to wean ourselves off of the
-   CONFIG versions.  (Among other things, some defective build environments
-   leak the Linux kernel's CONFIG_SYMBOLS into the system's standard #include
-   files.  We've experienced collisions before.)
- ---
  FEATURE_CLEAN_UP
    This is more an unresolved issue than a to-do item.  More thought is needed.
-Line 269 
 Minor stuff:
+Line 236 
 Minor stuff:
  ---
    unify progress_meter. wget, flash_eraseall, pipe_progress, fbsplash, setfiles.
  ---
-    support start-stop-daemon -d <chdir-path>
+   support start-stop-daemon -d <chdir-path>
- Code cleanup:
- Replace deprecated functions.
  ---
  vdprintf() -> similar sized functionality
  ---
-Line 299 
 vdprintf() -> similar sized functionalit
+Line 261 
 vdprintf() -> similar sized functionalit
    The first step would to generate a file/matrix what is already archived
    (also IPV6)
- * ntpdate/ntpd (see ntpclient and openntp for examples)
  * implement 'at'
  * rpcbind (former portmap) or equivalent
-Line 314 
 vdprintf() -> similar sized functionalit
+Line 274 
 vdprintf() -> similar sized functionalit
    most likely there is more
  * even more support for statistics: mpstat, iostat, powertop....
- Unicode work needed:
- Unicode support uses libc multibyte functions if LOCALE_SUPPORT is on
- (in this case, the code will also support many more encodings),
- or uses a limited subset of re-implemented multibyte functions
- which only understand "one byte == one char" and unicode.
- This is useful if you build against uclibc with locale support disabled.
- Unicode-dependent applets must call check_unicode_in_env() when they
- begin executing.
- Applet code may conditionalize on FEATURE_ASSUME_UNICODE
- in order to use more efficient code if unicode support is not requested.
- Available functions (if you need more, implement them in libbb/unicode.c
- so that they work without LOCALE_SUPPORT too):
- int bb_mbstrlen(str) - multibyte-aware strlen
- size_t mbstowcs(wdest, src, n)
- size_t wcstombs(dest, wsrc, n)
- size_t wcrtomb(str, wc, wstate)
- int iswspace(wc)
- int iswalnum(wc)
- int iswpunct(wc)
- Applets which only need to align columns on screen correctly:
- ls - already done, use source as an example
- df
- dumpleases
- lsmod
- Applets which need to account for Unicode chars
- while processing the output:
- [un]expand
- fold
- man
- watch
- cut (-b and -c are currently the same, needs fixing)
- These applets need to ensure that unicode input
- is handled correctly (say, <unicode><backspace> sequence):
- getty, login
- rm -i
- unzip (overwrite prompt)
- Viewers/editors are more difficult (many cases to get right).
- libbb/lineedit.c is an example how to do it:
- less, most, ed, vi
- awk
- [ef]grep
- sed
- Probably needs some specialized work:
- loadkeys

 Legend:



Removed from v.1122
 


changed lines


 
Added in v.1123
 Legend:



Removed from v.1122
 


changed lines


 
Added in v.1123
-Removed from v.1122
+Added in v.1123