GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: usr.bin/grep/mmfile.c Lines: 30 31 96.8 %
Date: 2017-11-13 Branches: 13 18 72.2 %

Line Branch Exec Source
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/*	$OpenBSD: mmfile.c,v 1.17 2015/02/06 23:21:59 millert Exp $	*/
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/*-
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 * Copyright (c) 1999 James Howard and Dag-Erling Coïdan Smørgrav
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 * 1. Redistributions of source code must retain the above copyright
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 *    notice, this list of conditions and the following disclaimer.
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 * 2. Redistributions in binary form must reproduce the above copyright
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 *    notice, this list of conditions and the following disclaimer in the
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 *    documentation and/or other materials provided with the distribution.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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 * SUCH DAMAGE.
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 */
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#include <sys/mman.h>
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#include <sys/stat.h>
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#include <err.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include "grep.h"
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#ifndef SMALL
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#define MAX_MAP_LEN 1048576
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mmf_t *
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mmopen(char *fn, char *mode)
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{
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	mmf_t *mmf;
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	struct stat st;
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	if (*mode != 'r')
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		return NULL;
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	mmf = grep_malloc(sizeof *mmf);
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	if ((mmf->fd = open(fn, O_RDONLY)) == -1)
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		goto ouch1;
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	if (fstat(mmf->fd, &st) == -1)
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		goto ouch2;
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	if (st.st_size > SIZE_MAX) /* too big to mmap */
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		goto ouch2;
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	if (!S_ISREG(st.st_mode)) /* only mmap regular files */
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		goto ouch2;
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235
	mmf->len = (size_t)st.st_size;
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	mmf->base = mmap(NULL, mmf->len, PROT_READ, MAP_PRIVATE, mmf->fd, (off_t)0);
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235
	if (mmf->base == MAP_FAILED)
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		goto ouch2;
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	mmf->ptr = mmf->base;
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	mmf->end = mmf->base + mmf->len;
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	madvise(mmf->base, mmf->len, MADV_SEQUENTIAL);
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	return mmf;
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ouch2:
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	close(mmf->fd);
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ouch1:
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	free(mmf);
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	return NULL;
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242
}
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void
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mmclose(mmf_t *mmf)
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{
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	munmap(mmf->base, mmf->len);
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	close(mmf->fd);
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	free(mmf);
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}
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char *
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mmfgetln(mmf_t *mmf, size_t *l)
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{
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	static char *p;
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26384
	if (mmf->ptr >= mmf->end)
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		return NULL;
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1004324
	for (p = mmf->ptr; mmf->ptr < mmf->end; ++mmf->ptr)
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502162
		if (*mmf->ptr == '\n')
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		    break;
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12967
	*l = mmf->ptr - p;
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12967
	++mmf->ptr;
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12967
	return p;
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13192
}
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#endif