pussuw commented on code in PR #1654:
URL: https://github.com/apache/nuttx-apps/pull/1654#discussion_r1143779202
##########
nshlib/nsh.h:
##########
@@ -715,6 +715,25 @@ struct nsh_parser_s
#endif
};
+#ifdef CONFIG_NSH_ALIAS
+struct nsh_alias_s
+{
+ FAR struct nsh_alias_s *next; /* Single link list for traversing */
+ FAR char *name; /* Name of the alias */
+ FAR char *value; /* Value behind the name */
+ union
+ {
+ struct
+ {
+ uint8_t exp : 1; /* Already expanded ? */
Review Comment:
It is a POSIX requirement, a once expanded alias shall not be expanded again
within a single tokenized string.
```
$ alias foo=bar
$ foo foo <- this will expand to bar foo
```
The comment above is not correct. The recursive protection is against even
more insane aliases that would really end in infinite recursion. LIke:
```
$ alias echo=echo
$ echo
```
> To prevent infinite loops in recursive aliasing, if the shell is not
currently processing an alias of the same name, the word shall be replaced by
the value of the alias; otherwise, it shall not be replaced.
https://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#tag_18_03_01
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