xref: /csrg-svn/usr.bin/tn3270/distribution/sys_dos/system.c (revision 31185)

#include <stdio.h>

#include "../general/general.h"
#include "../api/api.h"
#include "spint.h"



/*
 * Called from telnet.c to fork a lower command.com.  We
 * use the spint... routines so that we can pick up
 * interrupts generated by application programs.
 */


int
shell(argc,argv)
int	argc;
char	*argv[];
{
    Spint spinted;
    char command[256];

    ClearElement(spinted);
    spinted.int_no = API_INTERRUPT_NUMBER;
    if (argc == 1) {
	command[0] = 0;
    } else {
	char *cmdptr;
	int length;

	argc--;
	argv++;
	strcpy(command, " /c");
	cmdptr = command+strlen(command);
	while (argc) {
	    if ((cmdptr+strlen(*argv)) >= (command+sizeof command)) {
		fprintf(stderr, "Argument list too long at argument *%s*.\n",
			    *argv);
		return 0;
	    }
	    *cmdptr++ = ' ';		/* Blank separators */
	    strcpy(cmdptr, *argv);
	    cmdptr += strlen(cmdptr);
	    argc--;
	    argv++;
	}
	length = strlen(command)-1;
	if (length < 0) {
	    length = 0;
	}
	command[0] = length;
    }

    /*
     * spint_start() returns when either the command has finished, or when
     * the required interrupt comes in.  In the latter case, the appropriate
     * thing to do is to process the interrupt, and then return to
     * the interrupt issuer by calling spint_continue().
     */
    spint_start(command, &spinted);
    while (spinted.done == 0) {
	/* Process request */
	handle_api(&spinted.regs, &spinted.sregs);
	spint_continue(&spinted);
    }
    if (spinted.rc != 0) {
	fprintf(stderr, "Process generated a return code of 0x%x.\n",
								spinted.rc);
    }
    return 0;
}