Commit graph

65 commits

Author SHA1 Message Date
Wolfgang Denk
54841ab50c Make sure that argv[] argument pointers are not modified.
The hush shell dynamically allocates (and re-allocates) memory for the
argument strings in the "char *argv[]" argument vector passed to
commands.  Any code that modifies these pointers will cause serious
corruption of the malloc data structures and crash U-Boot, so make
sure the compiler can check that no such modifications are being done
by changing the code into "char * const argv[]".

This modification is the result of debugging a strange crash caused
after adding a new command, which used the following argument
processing code which has been working perfectly fine in all Unix
systems since version 6 - but not so in U-Boot:

int main (int argc, char **argv)
{
	while (--argc > 0 && **++argv == '-') {
/* ====> */	while (*++*argv) {
			switch (**argv) {
			case 'd':
				debug++;
				break;
			...
			default:
				usage ();
			}
		}
	}
	...
}

The line marked "====>" will corrupt the malloc data structures and
usually cause U-Boot to crash when the next command gets executed by
the shell.  With the modification, the compiler will prevent this with
an
	error: increment of read-only location '*argv'

N.B.: The code above can be trivially rewritten like this:

	while (--argc > 0 && **++argv == '-') {
		char *arg = *argv;
		while (*++arg) {
			switch (*arg) {
			...

Signed-off-by: Wolfgang Denk <wd@denx.de>
Acked-by: Mike Frysinger <vapier@gentoo.org>
2010-07-04 23:55:42 +02:00
Wolfgang Denk
94796d8544 Make "usage" messages more helpful.
In case of incorrect command invocations U-Boot used to print pretty
useless "usage" messages, for example:

	=> nand markbad
	Usage:
	nand - NAND sub-system

In the result, the user would have to run the "help" command to get
the (available) information about correct command usage. Change this,
so that this information gets always printed.

Note that this changes the user interface of all commands, but
hopefully to the better.

Signed-off-by: Wolfgang Denk <wd@denx.de>
2009-06-12 20:45:48 +02:00
Detlev Zundel
2dce551e10 command.c: Expose the core of do_help as _do_help to the rest of u-boot.
Other commands implementing subcommands can reuse this code nicely.

Signed-off-by: Detlev Zundel <dzu@denx.de>
Signed-off-by: Andreas Pfefferle <ap@denx.de>
2009-03-27 21:06:30 +01:00
Peter Tyser
2fb2604d5c Command usage cleanup
Remove command name from all command "usage" fields and update
common/command.c to display "name - usage" instead of
just "usage". Also remove newlines from command usage fields.

Signed-off-by: Peter Tyser <ptyser@xes-inc.com>
2009-01-28 08:49:52 +01:00
Peter Tyser
62c3ae7c6e Standardize command usage messages with cmd_usage()
Signed-off-by: Peter Tyser <ptyser@xes-inc.com>
2009-01-28 08:43:45 +01:00
Jean-Christophe PLAGNIOL-VILLARD
6d0f6bcf33 rename CFG_ macros to CONFIG_SYS
Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
2008-10-18 21:54:03 +02:00
Kumar Gala
b799cb4c0e Expose command table search for sub-commands
Sub-command can benefit from using the same table and search functions
that top level commands have.  Expose this functionality by refactoring
find_cmd() and introducing find_cmd_tbl() that sub-command processing
can call.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
2008-10-18 21:54:02 +02:00
Jean-Christophe PLAGNIOL-VILLARD
8a40fb148e move cmd_get_data_size to command.c
add CMD_DATA_SIZE macro to enable it

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
2008-09-10 22:48:05 +02:00
Stefan Roese
f2302d4430 Fix merge problems
Signed-off-by: Stefan Roese <sr@denx.de>
2008-08-06 14:05:38 +02:00
Wolfgang Denk
53677ef18e Big white-space cleanup.
This commit gets rid of a huge amount of silly white-space issues.
Especially, all sequences of SPACEs followed by TAB characters get
removed (unless they appear in print statements).

Also remove all embedded "vim:" and "vi:" statements which hide
indentation problems.

Signed-off-by: Wolfgang Denk <wd@denx.de>
2008-05-21 00:14:08 +02:00
Jon Loeliger
b363148710 Remove references to the old cmd_confdefs.h include file.
Signed-off-by: Jon Loeliger <jdl@freescale.com>
2007-07-08 16:06:51 -05:00
wdenk
04a85b3b36 * Patches by Pantelis Antoniou, 30 Mar 2004:
- add auto-complete support to the U-Boot CLI
  - add support for NETTA and NETPHONE boards; fix NETVIA board

* Patch by Yuli Barcohen, 28 Mar 2004:
  - Add support for MPC8272 family including MPC8247/8248/8271/8272
  - Add support for MPC8272ADS evaluation board (another flavour of MPC8260ADS)
  - Change configuration method for MPC8260ADS family
2004-04-15 18:22:41 +00:00
wdenk
0d4983930a Patch by Kenneth Johansson, 30 Jun 2003:
get rid of MK_CMD_ENTRY macro; update doc/README.command
2003-07-01 21:06:45 +00:00
wdenk
8bde7f776c * Code cleanup:
- remove trailing white space, trailing empty lines, C++ comments, etc.
  - split cmd_boot.c (separate cmd_bdinfo.c and cmd_load.c)

* Patches by Kenneth Johansson, 25 Jun 2003:
  - major rework of command structure
    (work done mostly by Michal Cendrowski and Joakim Kristiansen)
2003-06-27 21:31:46 +00:00
wdenk
78f6622a1f Initial revision 2002-08-27 10:27:51 +00:00