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/*

 * Command parsing routines for RTEMS monitor

 *

 * TODO:

 *

 *  $Id: mon-command.c,v 1.2 2001-09-27 12:01:43 chris Exp $

 */

#include <rtems.h>

#include <rtems/monitor.h>

#include <stdio.h>

#include <string.h>

/*

 * make_argv(cp): token-count

 *      Break up the command line in 'cp' into global argv[] and argc (return

 *      value).

 */

int

rtems_monitor_make_argv(

    char *cp,

    int  *argc_p,

    char **argv)

{

    int argc = 0;

    while ((cp = strtok(cp, " \t\n\r")))

    {

        argv[argc++] = cp;

        cp = (char *) NULL;

    }

    argv[argc] = (char *) NULL;                 /* end of argv */

    return *argc_p = argc;

}

/*

 * Read and break up a monitor command

 *

 * We have to loop on the gets call, since it will return NULL under UNIX

 *  RTEMS when we get a signal (eg: SIGALRM).

 */

int

rtems_monitor_command_read(char *command,

                           int  *argc,

                           char **argv)

{

    static char monitor_prompt[32];

    /*

     * put node number in the prompt if we are multiprocessing

     */

    if (!rtems_configuration_get_user_multiprocessing_table())

        sprintf(monitor_prompt, "%s", MONITOR_PROMPT);

    else if (rtems_monitor_default_node != rtems_monitor_node)

        sprintf(monitor_prompt, "%d-%s-%d", rtems_monitor_node, MONITOR_PROMPT, rtems_monitor_default_node);

    else

        sprintf(monitor_prompt, "%d-%s", rtems_monitor_node, MONITOR_PROMPT);

#ifdef RTEMS_UNIX

    /* RTEMS on unix gets so many interrupt system calls this is hosed */

    printf("%s> ", monitor_prompt);

    fflush(stdout);

    while (gets(command) == (char *) 0)

        ;

#else

    do

    {

        printf("%s> ", monitor_prompt);

        fflush(stdout);

    } while (gets(command) == (char *) 0);

#endif

    return rtems_monitor_make_argv(command, argc, argv);

}

/*

 * Look up a command in a command table

 *

 */

rtems_monitor_command_entry_t *

rtems_monitor_command_lookup(

    rtems_monitor_command_entry_t *table,

    int                            argc,

    char                          **argv

)

{

    rtems_monitor_command_entry_t *p;

    rtems_monitor_command_entry_t *abbreviated_match = 0;

    int abbreviated_matches = 0;

    char *command;

    int command_length;

    command = argv[0];

    if ((table == 0) || (command == 0))

        goto failed;

    command_length = strlen(command);

    for (p = table; p->command; p++)

        if (STREQ(command, p->command))    /* exact match */

            goto done;

        else if (STRNEQ(command, p->command, command_length))

        {

            abbreviated_matches++;

            abbreviated_match = p;

        }

    /* no perfect match; is there a non-ambigous abbreviated match? */

    if ( ! abbreviated_match)

    {

        printf("Unrecognized command '%s'; try 'help'\n", command);

        goto failed;

    }

    if (abbreviated_matches > 1)

    {

        printf("Command '%s' is ambiguous; try 'help'\n", command);

        goto failed;

    }

    p = abbreviated_match;

done:

    if (p->command_function == 0)

        goto failed;

    return p;

failed:

    return 0;

}

void

rtems_monitor_command_usage(rtems_monitor_command_entry_t *table,

                            char *command_string)

{

    rtems_monitor_command_entry_t *help = 0;

    char *help_command_argv[2];

    /* if first entry in table is a usage, then print it out */

    if (command_string == 0)

    {

        if (STREQ(table->command, "--usage--") && table->usage)

            help = table;

    }

    else

    {

        help_command_argv[0] = command_string;

        help_command_argv[1] = 0;

        help = rtems_monitor_command_lookup(table, 1, help_command_argv);

    }

    if (help)

        printf("%s\n", help->usage);

}

void

rtems_monitor_help_cmd(

    int          argc,

    char       **argv,

    unsigned32   command_arg,

    boolean verbose

)

{

    int arg;

    rtems_monitor_command_entry_t *command;

    command = (rtems_monitor_command_entry_t *) command_arg;

    if (argc == 1)

        rtems_monitor_command_usage(command, 0);

    else

    {

        for (arg=1; argv[arg]; arg++)

            rtems_monitor_command_usage(command, argv[arg]);

    }

}