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add command_name helper

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The command_name function returns a malloced string for a given
command and its parents.  This can be used to display a message
to the user, but it is used internally to handle registration
and syntax errors.  This helps permit arbitrary command nesting.
This commit is contained in:
Zachary T Welch 2009-11-11 05:26:17 -08:00
parent f93c98081f
commit 2d3cc1eac1
2 changed files with 49 additions and 32 deletions
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71
src/helper/command.c
View File

@ -217,32 +217,22 @@ command_t* register_command(command_context_t *context, command_t *parent, char
if (c->handler == NULL)
return c;
/* If this is a two level command, e.g. "flash banks", then the
* "unknown" proc in startup.tcl must redirect to this command.
*
* "flash banks" is translated by "unknown" to "flash_banks"
* if such a proc exists
*/
/* Print help for command */
const char *t1="";
const char *t2="";
const char *t3="";
/* maximum of two levels :-) */
if (c->parent != NULL)
{
t1 = c->parent->name;
t2="_";
}
t3 = c->name;
const char *full_name = alloc_printf("ocd_%s%s%s", t1, t2, t3);
Jim_CreateCommand(interp, full_name, script_command, c, NULL);
free((void *)full_name);
const char *full_name = command_name(c, '_');
const char *ocd_name = alloc_printf("ocd_%s", full_name);
Jim_CreateCommand(interp, ocd_name, script_command, c, NULL);
free((void *)ocd_name);
/* we now need to add an overrideable proc */
const char *override_name = alloc_printf("proc %s%s%s {args} {if {[catch {eval ocd_%s%s%s $args}]==0} {return \"\"} else { return -code error }", t1, t2, t3, t1, t2, t3);
const char *override_name = alloc_printf("proc %s {args} {"
"if {[catch {eval ocd_%s $args}] == 0} "
"{return \"\"} else {return -code error}}",
full_name, full_name);
Jim_Eval_Named(interp, override_name, __THIS__FILE__, __LINE__);
free((void *)override_name);
free((void *)full_name);
/* accumulate help text in Tcl helptext list. */
Jim_Obj *helptext = Jim_GetGlobalVariableStr(interp, "ocd_helptext", JIM_ERRMSG);
if (Jim_IsShared(helptext))
@ -404,6 +394,28 @@ void command_print(command_context_t *context, const char *format, ...)
va_end(ap);
}
static char *__command_name(struct command_s *c, char delim, unsigned extra)
{
char *name;
unsigned len = strlen(c->name);
if (NULL == c->parent) {
// allocate enough for the name, child names, and '\0'
name = malloc(len + extra + 1);
strcpy(name, c->name);
} else {
// parent's extra must include both the space and name
name = __command_name(c->parent, delim, 1 + len + extra);
char dstr[2] = { delim, 0 };
strcat(name, dstr);
strcat(name, c->name);
}
return name;
}
char *command_name(struct command_s *c, char delim)
{
return __command_name(c, delim, 0);
}
static int run_command(command_context_t *context,
command_t *c, char *words[], unsigned num_words)
{
@ -419,17 +431,12 @@ static int run_command(command_context_t *context,
if (retval == ERROR_COMMAND_SYNTAX_ERROR)
{
/* Print help for command */
const char *t1="";
const char *t2="";
const char *t3="";
/* maximum of two levels :-) */
if (c->parent != NULL)
{
t1 = c->parent->name;
t2=" ";
}
t3 = c->name;
command_run_linef(context, "help {%s%s%s}", t1, t2, t3);
char *full_name = command_name(c, ' ');
if (NULL != full_name) {
command_run_linef(context, "help %s", full_name);
free(full_name);
} else
retval = -ENOMEM;
}
else if (retval == ERROR_COMMAND_CLOSE_CONNECTION)
{

10
src/helper/command.h
View File

@ -84,6 +84,16 @@ typedef struct command_s
struct command_s *next;
} command_t;
/**
* @param c The command to be named.
* @param delim The character to place between command names.
* @returns A malloc'd string containing the full command name,
* which may include one or more ancestor components. Multiple names
* are separated by single spaces. The caller must free() the string
* when done with it.
*/
char *command_name(struct command_s *c, char delim);
command_t* register_command(command_context_t *context,
command_t *parent, char *name,
int (*handler)(struct command_context_s *context,