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apps/nshlib: If CONFIG_NSH_VARS=y, the NSH 'set' command with not argument will list all of the local NSH variables.

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This commit is contained in:
Gregory Nutt
2018-10-02 11:54:18 -06:00
parent cb982ea8df
commit cf6c6a9556
5 changed files with 128 additions and 7 deletions
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61
nshlib/nsh_vars.c
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@@ -187,7 +187,7 @@ int nsh_removevar(FAR struct console_stdio_s *pstate, FAR char *pair)
* Description:
* Get, set, or unset an NSH variable.
*
* Input Parmeters:
* Input Parameters:
* vtbl - NSH session data
* name - The name of the variable to get or set
* value - The value to use with nsh_setvar()
@@ -195,7 +195,7 @@ int nsh_removevar(FAR struct console_stdio_s *pstate, FAR char *pair)
* Returned value:
* nsh_getvar() returns a read-only reference to the variable value on
* success or NULL on failure.
* nset_unsetvar() returns OK on success or an netaged errno value on
* nset_unsetvar() returns OK on success or an negated errno value on
* failure.
*
****************************************************************************/
@@ -204,8 +204,7 @@ int nsh_removevar(FAR struct console_stdio_s *pstate, FAR char *pair)
* Name: nsh_getvar
****************************************************************************/
FAR const char *nsh_getvar(FAR struct nsh_vtbl_s *vtbl,
FAR const char *name)
FAR char *nsh_getvar(FAR struct nsh_vtbl_s *vtbl,FAR const char *name)
{
FAR struct console_stdio_s *pstate = (FAR struct console_stdio_s *)vtbl;
FAR char *pair;
@@ -365,4 +364,58 @@ int nsh_unsetvar(FAR struct nsh_vtbl_s *vtbl, FAR const char *name)
}
#endif
/****************************************************************************
* Name: nsh_foreach_var
*
* Description:
* Visit each name-value pair in the environment.
*
* Input Parameters:
* vtbl - NSH session data
* cb - The callback function to be invoked for each environment
* variable.
*
* Returned Value:
* Zero if the all NSH variables have been traversed. A non-zero value
* means that the callback function requested early termination by
* returning a nonzero value.
*
****************************************************************************/
#ifndef CONFIG_NSH_DISABLE_SET
int nsh_foreach_var(FAR struct nsh_vtbl_s *vtbl, nsh_foreach_var_t cb,
FAR void *arg)
{
FAR struct console_stdio_s *pstate = (FAR struct console_stdio_s *)vtbl;
FAR char *ptr;
FAR char *end;
int ret = OK;
/* Verify input parameters */
DEBUGASSERT(pstate != NULL && cb != NULL);
/* Search for a name=value string with matching name */
end = &pstate->varp[pstate->varsz];
for (ptr = pstate->varp; ptr < end; ptr += (strlen(ptr) + 1))
{
/* Perform the callback */
ret = cb(vtbl, arg, ptr);
/* Terminate the traversal early if the callback so requests by
* returning a non-zero value.
*/
if (ret != 0)
{
break;
}
}
return ret;
}
#endif
#endif /* CONFIG_NSH_VARS */