Commit graph

16 commits

Author SHA1 Message Date
Wolfgang Denk
47e26b1bf9 cmd_usage(): simplify return code handling
Lots of code use this construct:

	cmd_usage(cmdtp);
	return 1;

Change cmd_usage() let it return 1 - then we can replace all these
ocurrances by

	return cmd_usage(cmdtp);

This fixes a few places with incorrect return code handling, too.

Signed-off-by: Wolfgang Denk <wd@denx.de>
2010-07-24 20:43:57 +02:00
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
a89c33db96 General help message cleanup
Many of the help messages were not really helpful; for example, many
commands that take no arguments would not print a correct synopsis
line, but "No additional help available." which is not exactly wrong,
but not helpful either.

Commit ``Make "usage" messages more helpful.'' changed this
partially. But it also became clear that lots of "Usage" and "Help"
messages (fields "usage" and "help" in struct cmd_tbl_s respective)
were actually redundant.

This patch cleans this up - for example:

Before:
	=> help dtt
	dtt - Digital Thermometer and Thermostat

	Usage:
	dtt         - Read temperature from digital thermometer and thermostat.

After:
	=> help dtt
	dtt - Read temperature from Digital Thermometer and Thermostat

	Usage:
	dtt

Signed-off-by: Wolfgang Denk <wd@denx.de>
2009-06-12 20:47:16 +02:00
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
Matthias Fuchs
b9233fe5d5 ppc4xx: Update esd's common LCD code for 405 boards
- Coding style cleanup (long lines)
- Add s1d13505 support
- Make some functions return a result code instead of void

Signed-off-by: Matthias Fuchs <matthias.fuchs@esd-electronics.com>
2008-04-22 13:47:37 +02:00
Matthias Fuchs
9ac6b6f3d3 ppc4xx: More cleanup for esd's LCD code
Signed-off-by: Matthias Fuchs <matthias.fuchs@esd-electronics.com>
2008-01-04 12:00:15 +01:00
Stefan Roese
e174ac34ad ppc4xx: Coding style cleanup
Signed-off-by: Stefan Roese <sr@denx.de>
2007-12-28 17:29:56 +01:00
Matthias Fuchs
77660c4b59 ppc4xx: use correct io accessors for esd's LCD code
This patch fixes esd's LCD dectection code to work correctly with
newer gcc versions.

Signed-off-by: Matthias Fuchs <matthias.fuchs@esd-electronics.com>
2007-12-28 17:21:38 +01:00
Stefan Roese
48a05a5188 Various changes to esd HH405 board specific files
Patch by Matthias Fuchs, 07 Feb 2006
2006-02-07 16:51:04 +01:00
Stefan Roese
c29ab9d71d Fix gzip bmp support (test if malloc fails, warning when truncated).
Increase CFG_VIDEO_LOGO_MAX_SIZE on HH405 board.
Patch by Stefan Roese, 08 Oct 2005
2005-10-08 10:19:07 +02:00
Wolfgang Denk
c177bb5f6c Fix VOH405 Support
Patch by Matthias Fuchs, 25 Sep 2005
2005-09-25 16:31:16 +02:00
Stefan Roese
98f4a3dfcb Add SM501 support to HH405 board.
Add support for gzip compressed bmp's (CONFIG_VIDEO_BMP_GZIP).
Add support for eeprom write-enable (CFG_EEPROM_WREN).
Patch by Stefan Roese, 22 Sep 2005
2005-09-22 09:04:17 +02:00
wdenk
efe2a4d5cf Code cleanup. 2004-12-16 21:44:03 +00:00
stroese
0621f6f9d3 esd common update 2004-12-16 18:43:13 +00:00