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- # include <sccs.h>
-
- SCCSID(@(#)xfree.c 8.1 12/31/84)
-
- /*
- ** XFREE -- free memory only if dynamically allocated.
- **
- ** This acts just like "free", except that it does nothing
- ** if the area handed to it hasn't been dynamically allocated.
- **
- ** Parameters:
- ** p -- a pointer to the area to free.
- **
- ** Returns:
- ** none.
- **
- ** Side Effects:
- ** Free memory queue is changed.
- **
- ** WARNING:
- ** This routine depends on the implementation of malloc
- ** in C; it may have to be changed on other systems.
- */
-
- xfree(p)
- char *p;
- {
- extern char end[];
-
- if (p >= end && p < (char *) &p)
- free(p);
- }
-