/* DevAvail by John V Pope 25 May '87
/*
/* This program was inspired by a message I read recently on CompuServe(TM).
/* It is intend to allow for checking for the existence of a device so as
/* to allow a startup-sequence file to determine whether or not to AddBuffers
/* and such.
/*
/* Usage: DevAvail <DEVICE>
/* Where DEVICE is any legal AmigaDOS device (or directory) name.
/*
/* Additionally the argument "?" and lack of any arguments prints out a usage
/* banner.
/*
/* The program will FAIL (return error 20) if the device does not exist.
/* Therefore usage is the same as programs such as ASK and PAUSE.
/*
/* Example:
/* Failat 25 ;Anything above 20 here is just fine.
/* DevAvail DF1: ;Determine if DF1: is available
/* If NOT ERROR ;Checking for DevAvail return code...
/* AddBuffers DF1: 25 ;I can access that device now.
/* Endif
/*
/* Permission is granted for unlimited use of any type whatsoever. Just leave
/* all credits atatched.
*/
#include <libraries/dosextens.h>
/* #define DEBUG
*/
#define BANNER "\nDevAvail by John V Pope 25 May 87.\
\nUsage: DevAvail <DEVICE>\
\n Where DEVICE is any legal AmigaDOS device (or directory) name.\
\nFail code 20 returns to Execute if not available."
#define FAIL 20 /* keeps from having to add another include */
main(argc,argv)
int argc;
char *argv[];
{
struct Process *pr;
if(argc != 2 || !strcmp(argv[1],"?"))
{
puts(BANNER);
}else
{
pr=(struct Process *)FindTask(0L); /* Find me. */
pr->pr_WindowPtr = -1; /* No Dos requesters, please. */
#ifdef DEBUG
puts(argv[1]);
#endif
if(DeviceProc(argv[1])==NULL)
{
#ifdef DEBUG
puts("Device Not Found.");
#endif
exit(FAIL); /* Couldn't find it so error is returned */
}
#ifdef DEBUG
else
puts("Device exists.");
#endif
}
}/* Just fall off the end of the world to indicate a device exists */
