env: allow to export only selected variables
New syntax:
env export [-t | -b | -c] [-s size] addr [var ...]
With this change it is possible to provide a list of variables names
that shall be exported. Whenno arguments are given, the whole
environment gets exported.
NOTE: The new handling of the "size" argument means a change to the
user API.
Signed-off-by: Wolfgang Denk <wd@denx.de>
diff --git a/common/cmd_nvedit.c b/common/cmd_nvedit.c
index 396a171..7194ade 100644
--- a/common/cmd_nvedit.c
+++ b/common/cmd_nvedit.c
@@ -125,7 +125,7 @@
}
/* print whole list */
- len = hexport_r(&env_htab, '\n', &res, 0);
+ len = hexport_r(&env_htab, '\n', &res, 0, 0, NULL);
if (len > 0) {
puts(res);
@@ -647,7 +647,7 @@
#ifdef CONFIG_CMD_EXPORTENV
/*
- * env export [-t | -b | -c] addr [size]
+ * env export [-t | -b | -c] [-s size] addr [var ...]
* -t: export as text format; if size is given, data will be
* padded with '\0' bytes; if not, one terminating '\0'
* will be added (which is included in the "filesize"
@@ -657,8 +657,12 @@
* '\0', list end marked by double "\0\0")
* -c: export as checksum protected environment format as
* used for example by "saveenv" command
+ * -s size:
+ * size of output buffer
* addr: memory address where environment gets stored
- * size: size of output buffer
+ * var... List of variable names that get included into the
+ * export. Without arguments, the whole environment gets
+ * exported.
*
* With "-c" and size is NOT given, then the export command will
* format the data as currently used for the persistent storage,
@@ -691,7 +695,7 @@
{
char buf[32];
char *addr, *cmd, *res;
- size_t size;
+ size_t size = 0;
ssize_t len;
env_t *envp;
char sep = '\n';
@@ -715,6 +719,11 @@
sep = '\0';
chk = 1;
break;
+ case 's': /* size given */
+ if (--argc <= 0)
+ return cmd_usage(cmdtp);
+ size = simple_strtoul(*++argv, NULL, 16);
+ goto NXTARG;
case 't': /* text format */
if (fmt++)
goto sep_err;
@@ -724,6 +733,7 @@
return cmd_usage(cmdtp);
}
}
+NXTARG: ;
}
if (argc < 1)
@@ -731,15 +741,14 @@
addr = (char *)simple_strtoul(argv[0], NULL, 16);
- if (argc == 2) {
- size = simple_strtoul(argv[1], NULL, 16);
+ if (size)
memset(addr, '\0', size);
- } else {
- size = 0;
- }
+
+ argc--;
+ argv++;
if (sep) { /* export as text file */
- len = hexport_r(&env_htab, sep, &addr, size);
+ len = hexport_r(&env_htab, sep, &addr, size, argc, argv);
if (len < 0) {
error("Cannot export environment: errno = %d\n",
errno);
@@ -758,7 +767,7 @@
else /* export as raw binary data */
res = addr;
- len = hexport_r(&env_htab, '\0', &res, ENV_SIZE);
+ len = hexport_r(&env_htab, '\0', &res, ENV_SIZE, argc, argv);
if (len < 0) {
error("Cannot export environment: errno = %d\n",
errno);
@@ -965,7 +974,7 @@
#if defined(CONFIG_CMD_EDITENV)
"env edit name - edit environment variable\n"
#endif
- "env export [-t | -b | -c] addr [size] - export environment\n"
+ "env export [-t | -b | -c] [-s size] addr [var ...] - export environment\n"
#if defined(CONFIG_CMD_GREPENV)
"env grep string [...] - search environment\n"
#endif
