105 lines
2.8 KiB
C
105 lines
2.8 KiB
C
#ifndef __minix
|
|
/* $OpenBSD: mmfile.c,v 1.11 2006/09/19 05:52:23 otto Exp $ */
|
|
|
|
/*-
|
|
* Copyright (c) 1999 James Howard and Dag-Erling Coïdan Smørgrav
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/mman.h>
|
|
#include <sys/stat.h>
|
|
|
|
#include <err.h>
|
|
#include <fcntl.h>
|
|
#include <stdlib.h>
|
|
#include <unistd.h>
|
|
|
|
#include "grep.h"
|
|
|
|
#define MAX_MAP_LEN 1048576
|
|
|
|
mmf_t *
|
|
mmopen(char *fn, char *mode)
|
|
{
|
|
mmf_t *mmf;
|
|
struct stat st;
|
|
|
|
/* XXX ignore mode for now */
|
|
mode = mode;
|
|
|
|
mmf = grep_malloc(sizeof *mmf);
|
|
if ((mmf->fd = open(fn, O_RDONLY)) == -1)
|
|
goto ouch1;
|
|
if (fstat(mmf->fd, &st) == -1)
|
|
goto ouch2;
|
|
if (st.st_size > SIZE_T_MAX) /* too big to mmap */
|
|
goto ouch2;
|
|
if (!S_ISREG(st.st_mode)) /* only mmap regular files */
|
|
goto ouch2;
|
|
mmf->len = (size_t)st.st_size;
|
|
mmf->base = mmap(NULL, mmf->len, PROT_READ, MAP_PRIVATE, mmf->fd, (off_t)0);
|
|
if (mmf->base == MAP_FAILED)
|
|
goto ouch2;
|
|
mmf->ptr = mmf->base;
|
|
mmf->end = mmf->base + mmf->len;
|
|
#ifndef __minix
|
|
madvise(mmf->base, mmf->len, MADV_SEQUENTIAL);
|
|
#endif
|
|
return mmf;
|
|
|
|
ouch2:
|
|
close(mmf->fd);
|
|
ouch1:
|
|
free(mmf);
|
|
return NULL;
|
|
}
|
|
|
|
void
|
|
mmclose(mmf_t *mmf)
|
|
{
|
|
munmap(mmf->base, mmf->len);
|
|
close(mmf->fd);
|
|
free(mmf);
|
|
}
|
|
|
|
char *
|
|
mmfgetln(mmf_t *mmf, size_t *l)
|
|
{
|
|
static char *p;
|
|
char *start = mmf->ptr; /* Remove speed bump */
|
|
char *end = mmf->end; /* Remove speed bump */
|
|
|
|
if (start >= end)
|
|
return NULL;
|
|
for (p = mmf->ptr; mmf->ptr < mmf->end; ++mmf->ptr)
|
|
if (*mmf->ptr == '\n')
|
|
break;
|
|
|
|
*l = mmf->ptr - p;
|
|
++mmf->ptr;
|
|
return p;
|
|
}
|
|
#endif
|