/* shell.h - Declarations and constants used by the Xinu shell */

/* Size constants */

#define SHELL_BUFLEN    TY_IBUFLEN+1    /* Length of input buffer       */
#define SHELL_MAXTOK    32              /* Maximum tokens per line      */
#define SHELL_CMDSTK    8192            /* Size of stack for process    */
                                        /*    that executes command     */
#define SHELL_ARGLEN    (SHELL_BUFLEN+SHELL_MAXTOK) /* Argument area    */
#define SHELL_CMDPRIO   20              /* Process priority for command */

/* Message constants */

/* Shell banner (assumes VT100) */

#define SHELL_BAN0      "\033[31;1m"
#define SHELL_BAN1      "------------------------------------------"
#define SHELL_BAN2      "   __    __   _____    _   _    _    _    "
#define SHELL_BAN3      "   \\ \\  / /  |__ __|  | \\ | |  | |  | |   "
#define SHELL_BAN4      "    \\ \\/ /     | |    |  \\| |  | |  | |   "
#define SHELL_BAN5      "    / /\\ \\    _| |_   | \\   |  | |  | |   "
#define SHELL_BAN6      "   / /  \\ \\  |     |  | | \\ |  \\  --  /   "
#define SHELL_BAN7      "   --    --   -----    -   -     ----     "
#define SHELL_BAN8      "------------------------------------------"
#define SHELL_BAN9      "\033[0m\n"

/* Messages shell displays for user */

#define SHELL_PROMPT    "xsh $ "        /* Command prompt               */
#define SHELL_STRTMSG   "Welcome to Xinu!\n"/* Welcome message          */
#define SHELL_EXITMSG   "Shell closed\n"/* Shell exit message           */
#define SHELL_SYNERRMSG "Syntax error\n"/* Syntax error message         */
#define SHELL_CREATEMSG "Cannot create process\n"/* command error       */
#define SHELL_INERRMSG  "Cannot open file %s for input\n" /* Input err  */
#define SHELL_OUTERRMSG "Cannot open file %s for output\n"/* Output err */
                                        /* Builtin cmd error message    */
#define SHELL_BGERRMSG  "Cannot redirect I/O or background a builtin\n" */
#define SHELL_PIPEMSG   "Cannot create a pipe\n"/* error opening a pipe */

/* Constants used for lexical analysis */

#define SH_NEWLINE      '\n'            /* New line character           */
#define SH_EOF          '\04'           /* Control-D is EOF             */
#define SH_AMPER        '&'             /* Ampersand character          */
#define SH_BLANK        ' '             /* Blank character              */
#define SH_TAB          '\t'            /* Tab character                */
#define SH_SQUOTE       '\''            /* Single quote character       */
#define SH_DQUOTE       '"'             /* Double quote character       */
#define SH_LESS         '<'             /* Less-than character          */
#define SH_GREATER      '>'             /* Greater-than character       */
#define SH_PIPE         '|'             /* Pipeline symbol              */

/* Token types */

#define SH_TOK_AMPER    0               /* Ampersand token              */
#define SH_TOK_LESS     1               /* Less-than token              */
#define SH_TOK_GREATER  2               /* Greater-than token           */
#define SH_TOK_PIPE     3               /* Pipeline token               */
#define SH_TOK_OTHER    4               /* Token other than those       */
                                        /*   listed above (e.g., an     */
                                        /*   alphanumeric string)       */

/* Shell return constants */

#define SHELL_OK         0
#define SHELL_ERROR      1
#define SHELL_EXIT      -3

/* Structure of an entry in the table of shell commands */

struct  cmdent  {                       /* Entry in command table       */
        char    *cname;                 /* Name of command              */
        int32   (*cfunc)(int32,char*[]);/* Function for command         */
};

extern  uint32  ncmd;
extern  const   struct  cmdent  cmdtab[];