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env: allow to export only selected variables

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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>
This commit is contained in:
Wolfgang Denk
2011-11-06 22:49:44 +01:00
parent 5721385b18
commit 37f2fe7472
11 changed files with 47 additions and 26 deletions
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15
lib/hashtable.c
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@ -478,7 +478,8 @@ static int cmpkey(const void *p1, const void *p2)
}
ssize_t hexport_r(struct hsearch_data *htab, const char sep,
char **resp, size_t size)
char **resp, size_t size,
int argc, char * const argv[])
{
ENTRY *list[htab->size];
char *res, *p;
@ -502,6 +503,16 @@ ssize_t hexport_r(struct hsearch_data *htab, const char sep,
if (htab->table[i].used > 0) {
ENTRY *ep = &htab->table[i].entry;
int arg, found = 0;
for (arg = 0; arg < argc; ++arg) {
if (strcmp(argv[arg], ep->key) == 0) {
found = 1;
break;
}
}
if ((argc > 0) && (found == 0))
continue;
list[n++] = ep;
@ -539,7 +550,7 @@ ssize_t hexport_r(struct hsearch_data *htab, const char sep,
/* Check if the user supplied buffer size is sufficient */
if (size) {
if (size < totlen + 1) { /* provided buffer too small */
debug("### buffer too small: %d, but need %d\n",
printf("Env export buffer too small: %d, but need %d\n",
size, totlen + 1);
__set_errno(ENOMEM);
return (-1);