/contrib/groff/src/libs/libbib/map.c
https://bitbucket.org/freebsd/freebsd-head/ · C · 86 lines · 49 code · 16 blank · 21 comment · 4 complexity · f6f74d4d4371d0a15e978ad5f63cd1d2 MD5 · raw file
- /* Copyright (C) 1989, 1990, 1991, 1992, 2000, 2001, 2004
- Free Software Foundation, Inc.
- Written by James Clark (jjc@jclark.com)
- This file is part of groff.
- groff is free software; you can redistribute it and/or modify it under
- the terms of the GNU General Public License as published by the Free
- Software Foundation; either version 2, or (at your option) any later
- version.
- groff is distributed in the hope that it will be useful, but WITHOUT ANY
- WARRANTY; without even the implied warranty of MERCHANTABILITY or
- FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
- for more details.
- You should have received a copy of the GNU General Public License along
- with groff; see the file COPYING. If not, write to the Free Software
- Foundation, 51 Franklin St - Fifth Floor, Boston, MA 02110-1301, USA. */
- #include <stdlib.h>
- #ifdef HAVE_CONFIG_H
- #include <config.h>
- #endif
- #ifdef HAVE_MMAP
- #include <sys/types.h>
- #include <sys/mman.h>
- /* The Net-2 man pages says that a MAP_FILE flag is required. */
- #ifndef MAP_FILE
- #define MAP_FILE 0
- #endif
- #ifdef __cplusplus
- extern "C" {
- #endif
- char *mapread(int fd, int nbytes)
- {
- char *p = (char *)mmap((void *)0, (size_t)nbytes, PROT_READ,
- MAP_FILE|MAP_PRIVATE, fd, (off_t)0);
- if (p == (char *)-1)
- return 0;
- /* mmap() shouldn't return 0 since MAP_FIXED wasn't specified. */
- if (p == 0)
- abort();
- return p;
- }
- int unmap(char *p, int len)
- {
- return munmap((void *)p, len);
- }
- #ifdef __cplusplus
- }
- #endif
- #else /* not HAVE_MMAP */
- #include <errno.h>
- #ifdef __cplusplus
- extern "C" {
- #endif
- char *mapread(int fd, int nbytes)
- {
- errno = ENODEV;
- return 0;
- }
- int unmap(char *p, int len)
- {
- errno = EINVAL;
- return -1;
- }
- #ifdef __cplusplus
- }
- #endif
- #endif /* not HAVE_MMAP */