/*      $OpenBSD: util.h,v 1.6 2019/01/25 00:19:26 millert Exp $        */

/*
 * Placed in the public domain by Todd C. Miller <millert@openbsd.org>
 * on October 9, 2004.
 */

#define MMAP(ptr, len, prot, flags, fd, off)    do {            \
        if ((ptr = mmap(NULL, len, prot, flags, fd, off)) == MAP_FAILED) { \
                usemmap = 0;                                            \
                if (errno != EINVAL)                                    \
                        warn("mmap");                                   \
                else if ((ptr = malloc(len)) == NULL) {                 \
                        ptr = MAP_FAILED;                               \
                        warn("malloc");                                 \
                } else if (pread(fd, ptr, len, off) != len) {           \
                        free(ptr);                                      \
                        ptr = MAP_FAILED;                               \
                        warn("pread");                                  \
                }                                                       \
        }                                                               \
} while (0)

#define MUNMAP(addr, len)       do {                                    \
        if (usemmap)                                                    \
                munmap(addr, len);                                      \
        else                                                            \
                free(addr);                                             \
        addr = NULL;                                                    \
} while (0)

extern int usemmap;
extern int dynamic_only;

struct xnlist {
        struct nlist nl;
        unsigned long n_size;
};