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hush: add showvar command for hush shell.

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This new command shows the local variables defined in
the hush shell:

=> help showvar
showvar
    - print values of all hushshell variables
showvar name ...
    - print value of hushshell variable 'name'

Also make the set_local_var() and unset_local_var ()
no longer static, so it is possible to define local
hush shell variables at boot time. If CONFIG_HUSH_INIT_VAR
is defined, u-boot calls hush_init_var (), where
boardspecific code can define local hush shell
variables at boottime.

Signed-off-by: Heiko Schocher <hs@denx.de>
This commit is contained in:
Heiko Schocher 2008-10-15 09:40:28 +02:00 committed by Wolfgang Denk
parent 67b23a3228
commit 81473f6781
3 changed files with 62 additions and 8 deletions
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60
common/hush.c
View File

@ -501,10 +501,6 @@ static void remove_bg_job(struct pipe *pi);
static char **make_list_in(char **inp, char *name);
static char *insert_var_value(char *inp);
static char *get_local_var(const char *var);
#ifndef __U_BOOT__
static void unset_local_var(const char *name);
#endif
static int set_local_var(const char *s, int flg_export);
#ifndef __U_BOOT__
/* Table of built-in functions. They can be forked or not, depending on
@ -2204,7 +2200,7 @@ static char *get_local_var(const char *s)
flg_export==0 if only local (not exporting) variable
flg_export==1 if "new" exporting environ
flg_export>1 if current startup environ (not call putenv()) */
static int set_local_var(const char *s, int flg_export)
int set_local_var(const char *s, int flg_export)
{
char *name, *value;
int result=0;
@ -2295,8 +2291,7 @@ static int set_local_var(const char *s, int flg_export)
return result;
}
#ifndef __U_BOOT__
static void unset_local_var(const char *name)
void unset_local_var(const char *name)
{
struct variables *cur;
@ -2311,8 +2306,10 @@ static void unset_local_var(const char *name)
error_msg("%s: readonly variable", name);
return;
} else {
#ifndef __U_BOOT__
if(cur->flg_export)
unsetenv(cur->name);
#endif
free(cur->name);
free(cur->value);
while (next->next != cur)
@ -2323,7 +2320,6 @@ static void unset_local_var(const char *name)
}
}
}
#endif
static int is_assignment(const char *s)
{
@ -3588,5 +3584,53 @@ static char * make_string(char ** inp)
return str;
}
#ifdef __U_BOOT__
int do_showvar (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
{
int i, k;
int rcode = 0;
struct variables *cur;
if (argc == 1) { /* Print all env variables */
for (cur = top_vars; cur; cur = cur->next) {
printf ("%s=%s\n", cur->name, cur->value);
if (ctrlc ()) {
puts ("\n ** Abort\n");
return 1;
}
}
return 0;
}
for (i = 1; i < argc; ++i) { /* print single env variables */
char *name = argv[i];
k = -1;
for (cur = top_vars; cur; cur = cur->next) {
if(strcmp (cur->name, name) == 0) {
k = 0;
printf ("%s=%s\n", cur->name, cur->value);
}
if (ctrlc ()) {
puts ("\n ** Abort\n");
return 1;
}
}
if (k < 0) {
printf ("## Error: \"%s\" not defined\n", name);
rcode ++;
}
}
return rcode;
}
U_BOOT_CMD(
showvar, CFG_MAXARGS, 1, do_showvar,
"showvar- print local hushshell variables\n",
"\n - print values of all hushshell variables\n"
"showvar name ...\n"
" - print value of hushshell variable 'name'\n"
);
#endif
#endif /* CFG_HUSH_PARSER */
/****************************************************************************/

4
common/main.c
View File

@ -341,6 +341,10 @@ void main_loop (void)
u_boot_hush_start ();
#endif
#if defined(CONFIG_HUSH_INIT_VAR)
hush_init_var ();
#endif
#ifdef CONFIG_AUTO_COMPLETE
install_auto_complete();
#endif

6
include/hush.h
View File

@ -32,4 +32,10 @@ extern int u_boot_hush_start(void);
extern int parse_string_outer(char *, int);
extern int parse_file_outer(void);
int set_local_var(const char *s, int flg_export);
void unset_local_var(const char *name);
#if defined(CONFIG_HUSH_INIT_VAR)
extern int hush_init_var (void);
#endif
#endif