269 lines
6.1 KiB
C
269 lines
6.1 KiB
C
/* $NetBSD: file.c,v 1.7 2011/04/18 22:46:48 joerg Exp $ */
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/* $FreeBSD: head/usr.bin/grep/file.c 211496 2010-08-19 09:28:59Z des $ */
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/* $OpenBSD: file.c,v 1.11 2010/07/02 20:48:48 nicm Exp $ */
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/*-
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* Copyright (c) 1999 James Howard and Dag-Erling Coïdan Smørgrav
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* Copyright (C) 2008-2010 Gabor Kovesdan <gabor@FreeBSD.org>
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* Copyright (C) 2010 Dimitry Andric <dimitry@andric.com>
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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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#if HAVE_NBTOOL_CONFIG_H
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#include "nbtool_config.h"
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#endif
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#include <sys/cdefs.h>
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__RCSID("$NetBSD: file.c,v 1.7 2011/04/18 22:46:48 joerg Exp $");
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#include <sys/param.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#ifndef ANDROID
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#include <bzlib.h>
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#endif
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#include <err.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stddef.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <wchar.h>
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#include <wctype.h>
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#ifndef ANDROID
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#include <zlib.h>
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#endif
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#include "grep.h"
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#define MAXBUFSIZ (32 * 1024)
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#define LNBUFBUMP 80
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#ifndef ANDROID
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static gzFile gzbufdesc;
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static BZFILE* bzbufdesc;
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#endif
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static unsigned char buffer[MAXBUFSIZ];
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static unsigned char *bufpos;
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static size_t bufrem;
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static unsigned char *lnbuf;
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static size_t lnbuflen;
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static inline int
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grep_refill(struct file *f)
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{
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ssize_t nr;
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int bzerr;
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bufpos = buffer;
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bufrem = 0;
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#ifndef ANDROID
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if (filebehave == FILE_GZIP)
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nr = gzread(gzbufdesc, buffer, MAXBUFSIZ);
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else if (filebehave == FILE_BZIP && bzbufdesc != NULL) {
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nr = BZ2_bzRead(&bzerr, bzbufdesc, buffer, MAXBUFSIZ);
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switch (bzerr) {
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case BZ_OK:
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case BZ_STREAM_END:
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/* No problem, nr will be okay */
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break;
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case BZ_DATA_ERROR_MAGIC:
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/*
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* As opposed to gzread(), which simply returns the
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* plain file data, if it is not in the correct
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* compressed format, BZ2_bzRead() instead aborts.
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*
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* So, just restart at the beginning of the file again,
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* and use plain reads from now on.
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*/
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BZ2_bzReadClose(&bzerr, bzbufdesc);
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bzbufdesc = NULL;
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if (lseek(f->fd, 0, SEEK_SET) == -1)
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return (-1);
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nr = read(f->fd, buffer, MAXBUFSIZ);
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break;
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default:
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/* Make sure we exit with an error */
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nr = -1;
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}
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} else
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#endif
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nr = read(f->fd, buffer, MAXBUFSIZ);
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if (nr < 0)
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return (-1);
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bufrem = nr;
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return (0);
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}
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static inline int
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grep_lnbufgrow(size_t newlen)
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{
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if (lnbuflen < newlen) {
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lnbuf = grep_realloc(lnbuf, newlen);
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lnbuflen = newlen;
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}
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return (0);
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}
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char *
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grep_fgetln(struct file *f, size_t *lenp)
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{
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unsigned char *p;
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char *ret;
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size_t len;
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size_t off;
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ptrdiff_t diff;
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/* Fill the buffer, if necessary */
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if (bufrem == 0 && grep_refill(f) != 0)
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goto error;
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if (bufrem == 0) {
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/* Return zero length to indicate EOF */
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*lenp = 0;
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return ((char *)bufpos);
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}
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/* Look for a newline in the remaining part of the buffer */
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if ((p = memchr(bufpos, line_sep, bufrem)) != NULL) {
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++p; /* advance over newline */
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ret = (char *)bufpos;
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len = p - bufpos;
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bufrem -= len;
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bufpos = p;
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*lenp = len;
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return (ret);
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}
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/* We have to copy the current buffered data to the line buffer */
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for (len = bufrem, off = 0; ; len += bufrem) {
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/* Make sure there is room for more data */
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if (grep_lnbufgrow(len + LNBUFBUMP))
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goto error;
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memcpy(lnbuf + off, bufpos, len - off);
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off = len;
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if (grep_refill(f) != 0)
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goto error;
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if (bufrem == 0)
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/* EOF: return partial line */
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break;
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if ((p = memchr(bufpos, line_sep, bufrem)) == NULL)
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continue;
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/* got it: finish up the line (like code above) */
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++p;
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diff = p - bufpos;
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len += diff;
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if (grep_lnbufgrow(len))
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goto error;
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memcpy(lnbuf + off, bufpos, diff);
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bufrem -= diff;
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bufpos = p;
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break;
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}
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*lenp = len;
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return ((char *)lnbuf);
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error:
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*lenp = 0;
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return (NULL);
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}
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static inline struct file *
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grep_file_init(struct file *f)
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{
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#ifndef ANDROID
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if (filebehave == FILE_GZIP &&
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(gzbufdesc = gzdopen(f->fd, "r")) == NULL)
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goto error;
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if (filebehave == FILE_BZIP &&
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(bzbufdesc = BZ2_bzdopen(f->fd, "r")) == NULL)
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goto error;
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#endif
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/* Fill read buffer, also catches errors early */
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if (grep_refill(f) != 0)
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goto error;
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/* Check for binary stuff, if necessary */
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if (!nulldataflag && binbehave != BINFILE_TEXT &&
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memchr(bufpos, '\0', bufrem) != NULL)
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f->binary = true;
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return (f);
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error:
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close(f->fd);
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free(f);
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return (NULL);
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}
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/*
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* Opens a file for processing.
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*/
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struct file *
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grep_open(const char *path)
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{
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struct file *f;
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f = grep_malloc(sizeof *f);
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memset(f, 0, sizeof *f);
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if (path == NULL) {
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/* Processing stdin implies --line-buffered. */
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lbflag = true;
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f->fd = STDIN_FILENO;
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} else if ((f->fd = open(path, O_RDONLY)) == -1) {
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free(f);
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return (NULL);
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}
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return (grep_file_init(f));
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}
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/*
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* Closes a file.
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*/
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void
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grep_close(struct file *f)
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{
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close(f->fd);
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/* Reset read buffer and line buffer */
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bufpos = buffer;
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bufrem = 0;
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free(lnbuf);
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lnbuf = NULL;
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lnbuflen = 0;
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}
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