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1992-02-02
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2KB
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57 lines
/****************************************************************************/
/* */
/* This program shows that JMODEM will execute without crashing the */
/* system from a DOS Shell executed from any properly written BBS */
/* system or BBS window. This program allocates memory just like BBS */
/* systems do, it writes to the memory, then spawns JMODEM as a sub- */
/* process from a DOS Shell ( Microsoft C _system(); ). Then it returns */
/* and the parent process again writes to memory. The program then exits */
/* to DOS. There will ne NO errors and NO crashes. */
/****************************************************************************/
#include <stdio.h> /* for _puts() */
#include <stdlib.h> /* for _system() */
#if defined (TURBOC)
#include <alloc.h>
#else
#include <malloc.h> /* for _malloc() */
#endif
void main(void);
#define BYTES 61000
void main ()
{
unsigned short i;
unsigned char *memory;
/* Get some memory (a lot) */
memory = (unsigned char *) malloc((unsigned short)BYTES);
if (!memory)
{
puts ("Memory allocation failed!");
return;
}
system ("CLS");
puts ("I am writing to memory I own ...");
for (i = 0; i< BYTES; i++)
*memory++ = (unsigned char) i; /* Write to the memory */
puts ("Now I'll execute JMODEM ...");
puts ("Type CTRL-BRK to exit from JMODEM (it will take 5 seconds)....");
for (i=0; i<18; i++)
puts("JMODEM JMODEM JMODEM JMODEM JMODEM JMODEM JMODEM JMODEM");
system("JMODEM S1 NUL");
for (i = 0; i< BYTES; i++)
*(--memory) = (unsigned char) i; /* Write to the memory again */
puts ("\nAs you can see, the system did not crash ....");
free (memory);
}