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Annotation of 43BSDTahoe/ucb/tn3270/sys_dos/system.c, revision 1.1.1.1

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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