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Annotation of 43BSDReno/usr.bin/tn3270/distribution/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 the above copyright notice and this paragraph are
                      7:  * duplicated in all such forms and that any documentation,
                      8:  * advertising materials, and other materials related to such
                      9:  * distribution and use acknowledge that the software was developed
                     10:  * by the University of California, Berkeley.  The name of the
                     11:  * University may not be used to endorse or promote products derived
                     12:  * from this software without specific prior written permission.
                     13:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
                     14:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
                     15:  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
                     16:  */
                     17: 
                     18: #ifndef lint
                     19: static char sccsid[] = "@(#)system.c   4.1 (Berkeley) 12/4/88";
                     20: #endif /* not lint */
                     21: 
                     22: #include <stdio.h>
                     23: 
                     24: #include "../general/general.h"
                     25: #include "../ctlr/api.h"
                     26: #include "spint.h"
                     27: 
                     28: #include "../general/globals.h"
                     29: 
                     30: 
                     31: static Spint spinted;
                     32: static char command[256];
                     33: static int need_to_start = 0;
                     34: 
                     35: /*
                     36:  * shell_continue() actually runs the command, and looks for API
                     37:  * requests coming back in.
                     38:  *
                     39:  * We are called from the main loop in telnet.c.
                     40:  */
                     41: 
                     42: int
                     43: shell_continue()
                     44: {
                     45:     /*
                     46:      * spint_start() returns when either the command has finished, or when
                     47:      * the required interrupt comes in.  In the latter case, the appropriate
                     48:      * thing to do is to process the interrupt, and then return to
                     49:      * the interrupt issuer by calling spint_continue().
                     50:      */
                     51:     if (need_to_start) {
                     52:        need_to_start = 0;
                     53:        spint_start(command, &spinted);
                     54:     }
                     55: 
                     56:     if (spinted.done == 0) {
                     57:        /* Process request */
                     58:        handle_api(&spinted.regs, &spinted.sregs);
                     59:        spint_continue(&spinted);
                     60:     } else {
                     61:        char inputbuffer[100];
                     62: 
                     63:        if (spinted.rc != 0) {
                     64:            fprintf(stderr, "Process generated a return code of 0x%x.\n",
                     65:                                                                spinted.rc);
                     66:        }
                     67:        printf("[Hit return to continue]");
                     68:        fflush(stdout);
                     69:        (void) gets(inputbuffer);
                     70:        shell_active = 0;
                     71:        setconnmode();
                     72:        ConnectScreen();
                     73:     }
                     74:     return shell_active;
                     75: }
                     76: 
                     77: 
                     78: /*
                     79:  * Called from telnet.c to fork a lower command.com.  We
                     80:  * use the spint... routines so that we can pick up
                     81:  * interrupts generated by application programs.
                     82:  */
                     83: 
                     84: 
                     85: int
                     86: shell(argc,argv)
                     87: int    argc;
                     88: char   *argv[];
                     89: {
                     90: 
                     91:     ClearElement(spinted);
                     92:     spinted.int_no = API_INTERRUPT_NUMBER;
                     93:     if (argc == 1) {
                     94:        command[0] = 0;
                     95:     } else {
                     96:        char *cmdptr;
                     97:        int length;
                     98: 
                     99:        argc--;
                    100:        argv++;
                    101:        strcpy(command, " /c");
                    102:        cmdptr = command+strlen(command);
                    103:        while (argc) {
                    104:            if ((cmdptr+strlen(*argv)) >= (command+sizeof command)) {
                    105:                fprintf(stderr, "Argument list too long at argument *%s*.\n",
                    106:                            *argv);
                    107:                return 0;
                    108:            }
                    109:            *cmdptr++ = ' ';            /* Blank separators */
                    110:            strcpy(cmdptr, *argv);
                    111:            cmdptr += strlen(cmdptr);
                    112:            argc--;
                    113:            argv++;
                    114:        }
                    115:        length = strlen(command)-1;
                    116:        if (length < 0) {
                    117:            length = 0;
                    118:        }
                    119:        command[0] = length;
                    120:     }
                    121:     need_to_start = 1;
                    122:     shell_active = 1;
                    123:     return 1;                  /* Go back to main loop */
                    124: }

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