Listing 4

/*
 * This program demonstrates the behavior of install when it
 * tries to add a definition that is too big to fit in the
 * table and the table ends near the end of a memory segment.
 * This program has been compiled and tested with Microsoft C
 * 5.1 using the compact, large and huge memory models.
 */

#include <stdio.h>
#include <string.h>

#define MAXCHARS 65535
#define ROOM 3

static char ndtable[MAXCHARS];
static char *endtab = &ndtable[MAXCHARS];
static char *nexttab = &ndtable[MAXCHARS - ROOM];

void install(const char *name, const char *defn)
    {
    size_t dlen, nlen;

    nlen = strlen(name) + 1;
    dlen = strlen(defn) + 1;
    if (nexttab + nlen + dlen > endtab)
        printf("too many definitions");
    else
        {
        printf("there's room!?");

        /* ... install the definition ... */

        }
    printf(" (%p)\n", nexttab + nlen + dlen);
    }

void main(void)
    {
    printf("ndtable = %p\n", ndtable);
    printf("endtab  = %p\n", endtab);
    printf("nexttab = %p\n", nexttab);
    install("MAX", "100");
    }