60 lines
1.9 KiB
C
60 lines
1.9 KiB
C
/* alloca.c: Check if the system's alloca() function actually extends the
|
|
* stack. If it doesn't, it's not usable for Elk.
|
|
*
|
|
* The second value printed should be about 100 larger (or smaller,
|
|
* depending on the stack growing direction) than the first value.
|
|
*
|
|
* $Id$
|
|
*
|
|
* Copyright 1990, 1991, 1992, 1993, 1994, 1995, Oliver Laumann, Berlin
|
|
* Copyright 2002, 2003 Sam Hocevar <sam@zoy.org>, Paris
|
|
*
|
|
* This software was derived from Elk 1.2, which was Copyright 1987, 1988,
|
|
* 1989, Nixdorf Computer AG and TELES GmbH, Berlin (Elk 1.2 has been written
|
|
* by Oliver Laumann for TELES Telematic Services, Berlin, in a joint project
|
|
* between TELES and Nixdorf Microprocessor Engineering, Berlin).
|
|
*
|
|
* Oliver Laumann, TELES GmbH, Nixdorf Computer AG and Sam Hocevar, as co-
|
|
* owners or individual owners of copyright in this software, grant to any
|
|
* person or company a worldwide, royalty free, license to
|
|
*
|
|
* i) copy this software,
|
|
* ii) prepare derivative works based on this software,
|
|
* iii) distribute copies of this software or derivative works,
|
|
* iv) perform this software, or
|
|
* v) display this software,
|
|
*
|
|
* provided that this notice is not removed and that neither Oliver Laumann
|
|
* nor Teles nor Nixdorf are deemed to have made any representations as to
|
|
* the suitability of this software for any purpose nor are held responsible
|
|
* for any defects of this software.
|
|
*
|
|
* THERE IS ABSOLUTELY NO WARRANTY FOR THIS SOFTWARE.
|
|
*/
|
|
|
|
/* On some systems you may have to enable the #include and delete the line
|
|
* declaring alloca().
|
|
*/
|
|
|
|
/* #include <alloca.h> */
|
|
|
|
extern char *alloca();
|
|
|
|
char *stkbase;
|
|
|
|
prstk(char *s) {
|
|
char foo;
|
|
|
|
printf("stack %s calling alloca(100): %lu\n", s, (long)(stkbase - &foo));
|
|
}
|
|
|
|
main(int ac, **av) {
|
|
char *foo;
|
|
|
|
stkbase = (char *)&foo;
|
|
prstk("before");
|
|
foo = alloca(100);
|
|
prstk(" after");
|
|
return 0;
|
|
}
|