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/**
* @file
*
* @brief Command support routines for RTEMS monitor.
*/
/*
* 2001-01-30 KJO (vac4050@cae597.rsc.raytheon.com):
* Fixed rtems_monitor_command_lookup() to accept partial
* commands to uniqeness. Added support for setting
* the monitor prompt via an environment variable:
* RTEMS_MONITOR_PROMPT
*
* CCJ: 26-3-2000, adding command history and command line
* editing. This code is donated from My Right Boot and not
* covered by GPL, only the RTEMS license.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
#include <stdio.h>
#include <rtems.h>
#include <rtems/monitor.h>
static void
rtems_monitor_show_help (
const rtems_monitor_command_entry_t *help_cmd,
int max_cmd_len
)
{
#define MAX_HELP_LINE_LENGTH (75 - max_cmd_len - 2)
if (help_cmd && help_cmd->command)
{
const char *help = help_cmd->usage;
int help_len = strlen (help);
int spaces = max_cmd_len - strlen (help_cmd->command);
int show_this_line = 0;
int line_one = 1;
int c;
fprintf(stdout,"%s", help_cmd->command);
if (help_len == 0)
{
fprintf(stdout," - No help associated.\n");
return;
}
while (help_len)
{
fprintf(stdout,"%*c", spaces, ' ');
if (line_one)
fprintf(stdout," - ");
spaces = max_cmd_len + 2;
line_one = 0;
/*
* See if greater then the line length if so, work back
* from the end for a space, tab or lf or cr.
*/
if (help_len > MAX_HELP_LINE_LENGTH)
{
for (show_this_line = MAX_HELP_LINE_LENGTH - 1;
show_this_line;
show_this_line--)
if ((help[show_this_line] == ' ') ||
(help[show_this_line] == '\n') ||
(help[show_this_line] == '\r'))
break;
/*
* If show_this_line is 0, it is a very long word !!
*/
if (show_this_line == 0)
show_this_line = MAX_HELP_LINE_LENGTH - 1;
}
else
show_this_line = help_len;
for (c = 0; c < show_this_line; c++)
if ((help[c] == '\r') || (help[c] == '\n'))
show_this_line = c;
else
putchar (help[c]);
fprintf(stdout,"\n");
help += show_this_line;
help_len -= show_this_line;
/*
* Move past the line feeds or what ever else is being skipped.
*/
while (help_len)
{
if ((*help != '\r') && (*help != '\n'))
break;
if (*help != ' ')
{
help++;
help_len--;
break;
}
help++;
help_len--;
}
}
}
}
void
rtems_monitor_command_usage(
const rtems_monitor_command_entry_t *table,
const char *command_name
)
{
const rtems_monitor_command_entry_t *command = table;
int max_cmd_len = 0;
/* if first entry in table is a usage, then print it out */
if (command_name && (*command_name != '\0'))
{
command = rtems_monitor_command_lookup (command_name);
if (command)
rtems_monitor_show_help (command, strlen (command_name));
else
fprintf(stdout,"Unrecognised command; try just 'help'\n");
return;
}
/*
* Find the largest command size.
*/
while (command)
{
int len = command->command ? strlen (command->command) : 0 ;
if (len > max_cmd_len)
max_cmd_len = len;
command = command->next;
}
max_cmd_len++;
command = table;
/*
* Now some nice formatting for the help.
*/
while (command)
{
rtems_monitor_show_help (command, max_cmd_len);
command = command->next;
}
}
void rtems_monitor_help_cmd(
int argc,
char **argv,
const rtems_monitor_command_arg_t *command_arg,
bool verbose RTEMS_UNUSED
)
{
int arg;
const rtems_monitor_command_entry_t *command =
command_arg->monitor_command_entry;
if (argc == 1)
rtems_monitor_command_usage(command, 0);
else
{
for (arg = 1; argv[arg]; arg++)
rtems_monitor_command_usage(command, argv[arg]);
}
}
typedef struct {
const char *name;
size_t length;
const rtems_monitor_command_entry_t *match;
} rtems_monitor_command_lookup_entry;
static bool rtems_monitor_command_lookup_routine(
const rtems_monitor_command_entry_t *e,
void *arg
)
{
rtems_monitor_command_lookup_entry *le =
(rtems_monitor_command_lookup_entry *) arg;
/* Check name */
if (strncmp(e->command, le->name, le->length) == 0) {
/* Check for ambiguity */
if (le->match == NULL) {
le->match = e;
} else {
return false;
}
}
return true;
}
/**
* @brief Looks for a command with the name @a name in the list of registered
* commands.
*
* The parameter @a name must not be NULL.
*
* Returns the corresponding command entry or NULL if no command is found.
*/
const rtems_monitor_command_entry_t *rtems_monitor_command_lookup(
const char *name
)
{
rtems_monitor_command_lookup_entry e = {
.name = name,
.length = strlen( name),
.match = NULL
};
rtems_monitor_command_iterate(rtems_monitor_command_lookup_routine, &e);
return e.match;
}
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