1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
|
/*
** SHEL2DOS.C - Shell to DOS from a running program
**
** Original Copyright 1989-1991 by Bob Stout as part of
** the MicroFirm Function Library (MFL)
**
** This subset version is hereby donated to the public domain.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <process.h>
int shell_to_DOS(void)
{
char *comspec, prompt[256], *oldprompt;
int retval;
comspec = getenv("COMSPEC");
if(comspec == NULL)
comspec = "COMMAND.COM"; /* Better than nothing... */
sprintf(prompt, "PROMPT=[Type EXIT to return to program]\r\n%s",
oldprompt = getenv("PROMPT"));
putenv(prompt);
retval = spawnlp(0, comspec, comspec, NULL);
sprintf(prompt, "PROMPT=%s", oldprompt);
putenv(prompt);
return retval;
}
#ifdef TEST
#include <stdio.h>
void main(void)
{
int retval = shell_to_DOS();
printf("shell_to_DOS() returned %d\n", retval);
retval = shell_to_DOS();
printf("shell_to_DOS() returned %d\n", retval);
}
#endif
|
