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Annotation of 43BSDTahoe/ucb/tn3270/sys_dos/system.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1988 Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms are permitted
        !             6:  * provided that this notice is preserved and that due credit is given
        !             7:  * to the University of California at Berkeley. The name of the University
        !             8:  * may not be used to endorse or promote products derived from this
        !             9:  * software without specific prior written permission. This software
        !            10:  * is provided ``as is'' without express or implied warranty.
        !            11:  */
        !            12: 
        !            13: #ifndef lint
        !            14: static char sccsid[] = "@(#)system.c   3.2 (Berkeley) 3/28/88";
        !            15: #endif /* not lint */
        !            16: 
        !            17: #include <stdio.h>
        !            18: 
        !            19: #include "../general/general.h"
        !            20: #include "../ctlr/api.h"
        !            21: #include "spint.h"
        !            22: 
        !            23: #include "../general/globals.h"
        !            24: 
        !            25: 
        !            26: static Spint spinted;
        !            27: static char command[256];
        !            28: static int need_to_start = 0;
        !            29: 
        !            30: /*
        !            31:  * shell_continue() actually runs the command, and looks for API
        !            32:  * requests coming back in.
        !            33:  *
        !            34:  * We are called from the main loop in telnet.c.
        !            35:  */
        !            36: 
        !            37: int
        !            38: shell_continue()
        !            39: {
        !            40:     /*
        !            41:      * spint_start() returns when either the command has finished, or when
        !            42:      * the required interrupt comes in.  In the latter case, the appropriate
        !            43:      * thing to do is to process the interrupt, and then return to
        !            44:      * the interrupt issuer by calling spint_continue().
        !            45:      */
        !            46:     if (need_to_start) {
        !            47:        need_to_start = 0;
        !            48:        spint_start(command, &spinted);
        !            49:     }
        !            50: 
        !            51:     if (spinted.done == 0) {
        !            52:        /* Process request */
        !            53:        handle_api(&spinted.regs, &spinted.sregs);
        !            54:        spint_continue(&spinted);
        !            55:     } else {
        !            56:        char inputbuffer[100];
        !            57: 
        !            58:        if (spinted.rc != 0) {
        !            59:            fprintf(stderr, "Process generated a return code of 0x%x.\n",
        !            60:                                                                spinted.rc);
        !            61:        }
        !            62:        printf("[Hit return to continue]");
        !            63:        fflush(stdout);
        !            64:        (void) gets(inputbuffer);
        !            65:        shell_active = 0;
        !            66:        setconnmode();
        !            67:        ConnectScreen();
        !            68:     }
        !            69:     return shell_active;
        !            70: }
        !            71: 
        !            72: 
        !            73: /*
        !            74:  * Called from telnet.c to fork a lower command.com.  We
        !            75:  * use the spint... routines so that we can pick up
        !            76:  * interrupts generated by application programs.
        !            77:  */
        !            78: 
        !            79: 
        !            80: int
        !            81: shell(argc,argv)
        !            82: int    argc;
        !            83: char   *argv[];
        !            84: {
        !            85: 
        !            86:     ClearElement(spinted);
        !            87:     spinted.int_no = API_INTERRUPT_NUMBER;
        !            88:     if (argc == 1) {
        !            89:        command[0] = 0;
        !            90:     } else {
        !            91:        char *cmdptr;
        !            92:        int length;
        !            93: 
        !            94:        argc--;
        !            95:        argv++;
        !            96:        strcpy(command, " /c");
        !            97:        cmdptr = command+strlen(command);
        !            98:        while (argc) {
        !            99:            if ((cmdptr+strlen(*argv)) >= (command+sizeof command)) {
        !           100:                fprintf(stderr, "Argument list too long at argument *%s*.\n",
        !           101:                            *argv);
        !           102:                return 0;
        !           103:            }
        !           104:            *cmdptr++ = ' ';            /* Blank separators */
        !           105:            strcpy(cmdptr, *argv);
        !           106:            cmdptr += strlen(cmdptr);
        !           107:            argc--;
        !           108:            argv++;
        !           109:        }
        !           110:        length = strlen(command)-1;
        !           111:        if (length < 0) {
        !           112:            length = 0;
        !           113:        }
        !           114:        command[0] = length;
        !           115:     }
        !           116:     need_to_start = 1;
        !           117:     shell_active = 1;
        !           118:     return 1;                  /* Go back to main loop */
        !           119: }

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