home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
Amiga ACS 1998 #6
/
amigaacscoverdisc1998-061998.iso
/
games
/
descent
/
source
/
main
/
t.c
< prev
next >
Wrap
Text File
|
1998-06-08
|
2KB
|
90 lines
/*
THE COMPUTER CODE CONTAINED HEREIN IS THE SOLE PROPERTY OF PARALLAX
SOFTWARE CORPORATION ("PARALLAX"). PARALLAX, IN DISTRIBUTING THE CODE TO
END-USERS, AND SUBJECT TO ALL OF THE TERMS AND CONDITIONS HEREIN, GRANTS A
ROYALTY-FREE, PERPETUAL LICENSE TO SUCH END-USERS FOR USE BY SUCH END-USERS
IN USING, DISPLAYING, AND CREATING DERIVATIVE WORKS THEREOF, SO LONG AS
SUCH USE, DISPLAY OR CREATION IS FOR NON-COMMERCIAL, ROYALTY OR REVENUE
FREE PURPOSES. IN NO EVENT SHALL THE END-USER USE THE COMPUTER CODE
CONTAINED HEREIN FOR REVENUE-BEARING PURPOSES. THE END-USER UNDERSTANDS
AND AGREES TO THE TERMS HEREIN AND ACCEPTS THE SAME BY USE OF THIS FILE.
COPYRIGHT 1993-1998 PARALLAX SOFTWARE CORPORATION. ALL RIGHTS RESERVED.
*/
/* Use Turbo C */
#include <stdlib.h>
#include <dos.h>
#include <ctype.h>
// Returns: 0 Ok, -1=Out of space
int dos_change_master_env( char * variable, char * value, int append )
{
unsigned psp, far * tmp;
char far * env, far * e;
char * v, *p;
int size;
char var_name[1024];
char * var_value;
psp = _psp;
while (psp!=*(tmp=MK_FP(psp,22)))
psp = *tmp;
env = MK_FP( *(unsigned far *)MK_FP(psp,44),0);
size = 16* *(int far *)MK_FP( FP_SEG(env)-1,3);
var_value = value;
strcpy( var_name, variable );
strcat( var_name, "=" );
p = var_name;
while( *p ) {
*p = toupper( *p );
p++;
}
while (*env ) {
e = env;
v = var_name;
while((*e++ == *v++ ) && (*v))
;
if ( !*v ) {
if ( append )
while( (*v++ = *e++) )
;
else
while( *e++ )
;
if ( *e )
while((--size) && ((*env++ = *e++ )) || (*e) )
;
*env = '\0';
} else
while ((--size) && (*env++))
;
}
p = var_value;
if ( *p != '\0' ) {
v = var_name;
while ((*env = *v++) ) {
++env ;
--size;
}
while((--size) && ((*env++ = *p++ ) != '\0' ))
;
*env = '\0';
*--env = '\0';
if ( size <= 0 ) {
return -1;
}
}
return 0;
}
void main()
{
if (dos_change_master_env( "john", "a parallax employee", 0 ))
printf( "ERROR: Out of environment space!\n" );
}