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improve command registration 

Eliminate duplicate code for linking commands into a list.

Adds a check to ensure the command does not already exist;
if it does, return that one instead of creating a duplicate.
This commit is contained in:
Zachary T Welch 2009-11-11 10:20:55 -08:00
parent 46d9ba4c8b
commit 158698e333
1 changed files with 43 additions and 31 deletions
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74
src/helper/command.c
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@ -191,13 +191,53 @@ static void command_helptext_add(Jim_Obj *cmd_list, const char *help)
/* nice short description of source file */
#define __THIS__FILE__ "command.c"
command_t* register_command(command_context_t *context, command_t *parent, char *name, int (*handler)(struct command_context_s *context, char* name, char** args, int argc), enum command_mode mode, char *help)
/**
* Find a command by name from a list of commands.
* @returns The named command if found, or NULL.
*/
static struct command_s *command_find(struct command_s **head, const char *name)
{
command_t *c, *p;
assert(head);
for (struct command_s *cc = *head; cc; cc = cc->next)
{
if (strcmp(cc->name, name) == 0)
return cc;
}
return NULL;
}
/**
* Add the command to the end of linked list.
* @returns Returns false if the named command already exists in the list.
* Returns true otherwise.
*/
static void command_add_child(struct command_s **head, struct command_s *c)
{
assert(head);
if (NULL == *head)
{
*head = c;
return;
}
struct command_s *cc = *head;
while (cc->next) cc = cc->next;
cc->next = c;
}
command_t* register_command(command_context_t *context,
command_t *parent, char *name,
int (*handler)(struct command_context_s *context,
char* name, char** args, int argc),
enum command_mode mode, char *help)
{
if (!context || !name)
return NULL;
struct command_s **head = parent ? &parent->children : &context->commands;
struct command_s *c = command_find(head, name);
if (NULL != c)
return c;
c = malloc(sizeof(command_t));
c->name = strdup(name);
@ -207,35 +247,7 @@ command_t* register_command(command_context_t *context, command_t *parent, char
c->mode = mode;
c->next = NULL;
/* place command in tree */
if (parent)
{
if (parent->children)
{
/* find last child */
for (p = parent->children; p && p->next; p = p->next);
if (p)
p->next = c;
}
else
{
parent->children = c;
}
}
else
{
if (context->commands)
{
/* find last command */
for (p = context->commands; p && p->next; p = p->next);
if (p)
p->next = c;
}
else
{
context->commands = c;
}
}
command_add_child(head, c);
command_helptext_add(command_name_list(c), help);