1 /* $NetBSD: file.c,v 1.5 2011/02/16 18:35:39 joerg Exp $ */
3 /* $OpenBSD: file.c,v 1.11 2010/07/02 20:48:48 nicm Exp $ */
6 * Copyright (c) 1999 James Howard and Dag-Erling Coïdan Smørgrav
7 * Copyright (C) 2008-2010 Gabor Kovesdan <gabor@FreeBSD.org>
8 * Copyright (C) 2010 Dimitry Andric <dimitry@andric.com>
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 #include <sys/cdefs.h>
34 __FBSDID("$FreeBSD$");
36 #include <sys/param.h>
37 #include <sys/types.h>
54 #define MAXBUFSIZ (32 * 1024)
57 static gzFile gzbufdesc;
58 static BZFILE* bzbufdesc;
60 static unsigned char buffer[MAXBUFSIZ];
61 static unsigned char *bufpos;
64 static unsigned char *lnbuf;
65 static size_t lnbuflen;
68 grep_refill(struct file *f)
76 if (filebehave == FILE_GZIP)
77 nr = gzread(gzbufdesc, buffer, MAXBUFSIZ);
78 else if (filebehave == FILE_BZIP && bzbufdesc != NULL) {
79 nr = BZ2_bzRead(&bzerr, bzbufdesc, buffer, MAXBUFSIZ);
83 /* No problem, nr will be okay */
85 case BZ_DATA_ERROR_MAGIC:
87 * As opposed to gzread(), which simply returns the
88 * plain file data, if it is not in the correct
89 * compressed format, BZ2_bzRead() instead aborts.
91 * So, just restart at the beginning of the file again,
92 * and use plain reads from now on.
94 BZ2_bzReadClose(&bzerr, bzbufdesc);
96 if (lseek(f->fd, 0, SEEK_SET) == -1)
98 nr = read(f->fd, buffer, MAXBUFSIZ);
101 /* Make sure we exit with an error */
105 nr = read(f->fd, buffer, MAXBUFSIZ);
115 grep_lnbufgrow(size_t newlen)
118 if (lnbuflen < newlen) {
119 lnbuf = grep_realloc(lnbuf, newlen);
127 grep_fgetln(struct file *f, size_t *lenp)
135 /* Fill the buffer, if necessary */
136 if (bufrem == 0 && grep_refill(f) != 0)
140 /* Return zero length to indicate EOF */
145 /* Look for a newline in the remaining part of the buffer */
146 if ((p = memchr(bufpos, '\n', bufrem)) != NULL) {
147 ++p; /* advance over newline */
156 /* We have to copy the current buffered data to the line buffer */
157 for (len = bufrem, off = 0; ; len += bufrem) {
158 /* Make sure there is room for more data */
159 if (grep_lnbufgrow(len + LNBUFBUMP))
161 memcpy(lnbuf + off, bufpos, len - off);
163 if (grep_refill(f) != 0)
166 /* EOF: return partial line */
168 if ((p = memchr(bufpos, '\n', bufrem)) == NULL)
170 /* got it: finish up the line (like code above) */
174 if (grep_lnbufgrow(len))
176 memcpy(lnbuf + off, bufpos, diff);
189 static inline struct file *
190 grep_file_init(struct file *f)
193 if (filebehave == FILE_GZIP &&
194 (gzbufdesc = gzdopen(f->fd, "r")) == NULL)
197 if (filebehave == FILE_BZIP &&
198 (bzbufdesc = BZ2_bzdopen(f->fd, "r")) == NULL)
201 /* Fill read buffer, also catches errors early */
202 if (grep_refill(f) != 0)
205 /* Check for binary stuff, if necessary */
206 if (binbehave != BINFILE_TEXT && memchr(bufpos, '\0', bufrem) != NULL)
217 * Opens a file for processing.
220 grep_open(const char *path)
224 f = grep_malloc(sizeof *f);
225 memset(f, 0, sizeof *f);
227 /* Processing stdin implies --line-buffered. */
229 f->fd = STDIN_FILENO;
230 } else if ((f->fd = open(path, O_RDONLY)) == -1) {
235 return (grep_file_init(f));
242 grep_close(struct file *f)
247 /* Reset read buffer and line buffer */