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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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✗✓ |
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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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✓✓ |
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if ((mmf->fd = open(fn, O_RDONLY)) == -1) |
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goto ouch1; |
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✓✗ |
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if (fstat(mmf->fd, &st) == -1) |
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goto ouch2; |
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✓✗ |
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if (st.st_size > SIZE_MAX) /* too big to mmap */ |
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goto ouch2; |
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✓✓ |
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if (!S_ISREG(st.st_mode)) /* only mmap regular files */ |
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goto ouch2; |
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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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✓✗ |
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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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} |
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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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✓✓ |
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if (mmf->ptr >= mmf->end) |
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return NULL; |
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✓✗ |
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for (p = mmf->ptr; mmf->ptr < mmf->end; ++mmf->ptr) |
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✓✓ |
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if (*mmf->ptr == '\n') |
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break; |
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*l = mmf->ptr - p; |
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++mmf->ptr; |
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return p; |
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} |
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#endif |