tweak TODO file
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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Denys Vlasenko
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116
TODO
116
TODO
@ -1,5 +1,8 @@
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Busybox TODO
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Harvest patches from
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http://git.openembedded.org/cgit.cgi/openembedded/tree/recipes/busybox/
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Stuff that needs to be done. This is organized by who plans to get around to
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doing it eventually, but that doesn't mean they "own" the item. If you want to
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do one of these bounce an email off the person it's listed under to see if they
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@ -9,9 +12,6 @@ between your work and theirs. But otherwise, all of these are fair game.
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Rob Landley suggested this:
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Implement bb_realpath() that can handle NULL on non-glibc.
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Remove obsolete _() wrapper crud for internationalization we don't do.
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Figure out where we need utf8 support, and add it.
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sh
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The command shell situation is a mess. We have two different
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shells that don't really share any code, and the "standalone shell" doesn't
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@ -31,7 +31,7 @@ Rob Landley suggested this:
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How much internationalization should we do?
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The low hanging fruit is UTF-8 character set support. We should do this.
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(Vodz pointed out the shell's cmdedit as needing work here. What else?)
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See TODO_unicode file.
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We also have lots of hardwired english text messages. Consolidating this
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into some kind of message table not only makes translation easier, but
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@ -59,6 +59,7 @@ Rob Landley suggested this:
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Turning libbb into a real dll is another possibility, especially if libbb
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could export some of the other library interfaces we've already more or less
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got the code for (like zlib).
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buildroot - Make a "dogfood" option
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Busybox 1.1 will be capable of replacing most gnu packages for real world
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use, such as developing software or in a live CD. It needs wider testing.
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@ -78,22 +79,25 @@ Rob Landley suggested this:
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One example of an existing system that does this already is Firmware Linux:
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http://www.landley.net/code/firmware
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initramfs
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Busybox should have a sample initramfs build script. This depends on
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bbsh, mdev, and switch_root.
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mkdep
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Write a mkdep that doesn't segfault if there's a directory it doesn't
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have permission to read, isn't based on manually editing the output of
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lexx and yacc, doesn't make such a mess under include/config, etc.
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Group globals into unions of structures.
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Go through and turn all the global and static variables into structures,
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and have all those structures be in a big union shared between processes,
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so busybox uses less bss. (This is a big win on nommu machines.) See
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sed.c and mdev.c for examples.
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Go through bugs.busybox.net and close out all of that somehow.
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This one's open to everybody, but I'll wind up doing it...
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Bernhard Reutner-Fischer <busybox@busybox.net> suggests to look at these:
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New debug options:
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-Wlarger-than-127
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@ -177,40 +181,6 @@ Memory Allocation
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call free might also be optimized out by the compiler if written right, so
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we can yank those #ifdefs too, and generally clean up the code.
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---
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Switch CONFIG_SYMBOLS to ENABLE_SYMBOLS
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In busybox 1.0 and earlier, configuration was done by CONFIG_SYMBOLS
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that were either defined or undefined to indicate whether the symbol was
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selected in the .config file. They were used with #ifdefs, ala:
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#ifdef CONFIG_SYMBOL
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if (other_test) {
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do_code();
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}
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#endif
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In 1.1, we have new ENABLE_SYMBOLS which are always defined (as 0 or 1),
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meaning you can still use them for preprocessor tests by replacing
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"#ifdef CONFIG_SYMBOL" with "#if ENABLE_SYMBOL". But more importantly, we
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can use them as a true or false test in normal C code:
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if (ENABLE_SYMBOL && other_test) {
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do_code();
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}
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(Optimizing away if() statements that resolve to a constant value
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is known as "dead code elimination", an optimization so old and simple that
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Turbo Pascal for DOS did it twenty years ago. Even modern mini-compilers
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like the Tiny C Compiler (tcc) and the Small Device C Compiler (SDCC)
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perform dead code elimination.)
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Right now, busybox.h is #including both "config.h" (defining the
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CONFIG_SYMBOLS) and "bb_config.h" (defining the ENABLE_SYMBOLS). At some
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point in the future, it would be nice to wean ourselves off of the
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CONFIG versions. (Among other things, some defective build environments
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leak the Linux kernel's CONFIG_SYMBOLS into the system's standard #include
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files. We've experienced collisions before.)
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---
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FEATURE_CLEAN_UP
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This is more an unresolved issue than a to-do item. More thought is needed.
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@ -267,11 +237,6 @@ Minor stuff:
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unify progress_meter. wget, flash_eraseall, pipe_progress, fbsplash, setfiles.
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---
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support start-stop-daemon -d <chdir-path>
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Code cleanup:
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Replace deprecated functions.
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---
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vdprintf() -> similar sized functionality
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---
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@ -296,8 +261,6 @@ vdprintf() -> similar sized functionality
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The first step would to generate a file/matrix what is already archived
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(also IPV6)
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* ntpdate/ntpd (see ntpclient and openntp for examples)
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* implement 'at'
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* rpcbind (former portmap) or equivalent
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@ -311,64 +274,3 @@ vdprintf() -> similar sized functionality
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most likely there is more
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* even more support for statistics: mpstat, iostat, powertop....
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Unicode work needed:
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Unicode support uses libc multibyte functions if LOCALE_SUPPORT is on
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(in this case, the code will also support many more encodings),
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or uses a limited subset of re-implemented multibyte functions
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which only understand "one byte == one char" and unicode.
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This is useful if you build against uclibc with locale support disabled.
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Unicode-dependent applets must call check_unicode_in_env() when they
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begin executing.
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Applet code may conditionalize on UNICODE_SUPPORT in order to use
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more efficient code if unicode support is not requested.
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Available functions (if you need more, implement them in libbb/unicode.c
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so that they work without LOCALE_SUPPORT too):
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int bb_mbstrlen(str) - multibyte-aware strlen
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size_t mbstowcs(wdest, src, n)
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size_t wcstombs(dest, wsrc, n)
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size_t wcrtomb(str, wc, wstate)
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int iswspace(wc)
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int iswalnum(wc)
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int iswpunct(wc)
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Applets which only need to align columns on screen correctly:
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ls - already done, use source as an example
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df
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dumpleases
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lsmod
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Applets which need to account for Unicode chars
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while processing the output:
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[un]expand
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fold
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man
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watch
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cut (-b and -c are currently the same, needs fixing)
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These applets need to ensure that unicode input
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is handled correctly (say, <unicode><backspace> sequence):
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getty, login
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rm -i
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unzip (overwrite prompt)
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Viewers/editors are more difficult (many cases to get right).
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libbb/lineedit.c is an example how to do it:
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less, most, ed, vi
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awk
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[ef]grep
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sed
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Probably needs some specialized work:
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loadkeys
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