1 /* $NetBSD: file.c,v 1.7 2011/04/18 22:46:48 joerg Exp $ */ 2 /* $FreeBSD: head/usr.bin/grep/file.c 211496 2010-08-19 09:28:59Z des $ */ 3 /* $OpenBSD: file.c,v 1.11 2010/07/02 20:48:48 nicm Exp $ */ 4 5 /*- 6 * Copyright (c) 1999 James Howard and Dag-Erling Codan Smrgrav 7 * Copyright (C) 2008-2010 Gabor Kovesdan <gabor (at) FreeBSD.org> 8 * Copyright (C) 2010 Dimitry Andric <dimitry (at) andric.com> 9 * All rights reserved. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 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. 19 * 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 30 * SUCH DAMAGE. 31 */ 32 33 #if HAVE_NBTOOL_CONFIG_H 34 #include "nbtool_config.h" 35 #endif 36 37 #include <sys/cdefs.h> 38 __RCSID("$NetBSD: file.c,v 1.7 2011/04/18 22:46:48 joerg Exp $"); 39 40 #include <sys/param.h> 41 #include <sys/types.h> 42 #include <sys/stat.h> 43 44 #ifndef __ANDROID__ 45 #include <bzlib.h> 46 #endif 47 #include <err.h> 48 #include <errno.h> 49 #include <fcntl.h> 50 #include <stddef.h> 51 #include <stdlib.h> 52 #include <string.h> 53 #include <unistd.h> 54 #include <wchar.h> 55 #include <wctype.h> 56 #ifndef __ANDROID__ 57 #include <zlib.h> 58 #endif 59 60 #include "grep.h" 61 62 #define MAXBUFSIZ (32 * 1024) 63 #define LNBUFBUMP 80 64 65 #ifndef __ANDROID__ 66 static gzFile gzbufdesc; 67 static BZFILE* bzbufdesc; 68 #endif 69 70 static unsigned char buffer[MAXBUFSIZ]; 71 static unsigned char *bufpos; 72 static size_t bufrem; 73 74 static unsigned char *lnbuf; 75 static size_t lnbuflen; 76 77 static inline int 78 grep_refill(struct file *f) 79 { 80 ssize_t nr; 81 #ifndef __ANDROID__ 82 int bzerr; 83 #endif 84 85 bufpos = buffer; 86 bufrem = 0; 87 88 #ifndef __ANDROID__ 89 if (filebehave == FILE_GZIP) 90 nr = gzread(gzbufdesc, buffer, MAXBUFSIZ); 91 else if (filebehave == FILE_BZIP && bzbufdesc != NULL) { 92 nr = BZ2_bzRead(&bzerr, bzbufdesc, buffer, MAXBUFSIZ); 93 switch (bzerr) { 94 case BZ_OK: 95 case BZ_STREAM_END: 96 /* No problem, nr will be okay */ 97 break; 98 case BZ_DATA_ERROR_MAGIC: 99 /* 100 * As opposed to gzread(), which simply returns the 101 * plain file data, if it is not in the correct 102 * compressed format, BZ2_bzRead() instead aborts. 103 * 104 * So, just restart at the beginning of the file again, 105 * and use plain reads from now on. 106 */ 107 BZ2_bzReadClose(&bzerr, bzbufdesc); 108 bzbufdesc = NULL; 109 if (lseek(f->fd, 0, SEEK_SET) == -1) 110 return (-1); 111 nr = read(f->fd, buffer, MAXBUFSIZ); 112 break; 113 default: 114 /* Make sure we exit with an error */ 115 nr = -1; 116 } 117 } else 118 #endif 119 nr = read(f->fd, buffer, MAXBUFSIZ); 120 121 if (nr < 0) 122 return (-1); 123 124 bufrem = nr; 125 return (0); 126 } 127 128 static inline int 129 grep_lnbufgrow(size_t newlen) 130 { 131 132 if (lnbuflen < newlen) { 133 lnbuf = grep_realloc(lnbuf, newlen); 134 lnbuflen = newlen; 135 } 136 137 return (0); 138 } 139 140 char * 141 grep_fgetln(struct file *f, size_t *lenp) 142 { 143 unsigned char *p; 144 char *ret; 145 size_t len; 146 size_t off; 147 ptrdiff_t diff; 148 149 /* Fill the buffer, if necessary */ 150 if (bufrem == 0 && grep_refill(f) != 0) 151 goto error; 152 153 if (bufrem == 0) { 154 /* Return zero length to indicate EOF */ 155 *lenp = 0; 156 return ((char *)bufpos); 157 } 158 159 /* Look for a newline in the remaining part of the buffer */ 160 if ((p = memchr(bufpos, line_sep, bufrem)) != NULL) { 161 ++p; /* advance over newline */ 162 ret = (char *)bufpos; 163 len = p - bufpos; 164 bufrem -= len; 165 bufpos = p; 166 *lenp = len; 167 return (ret); 168 } 169 170 /* We have to copy the current buffered data to the line buffer */ 171 for (len = bufrem, off = 0; ; len += bufrem) { 172 /* Make sure there is room for more data */ 173 if (grep_lnbufgrow(len + LNBUFBUMP)) 174 goto error; 175 memcpy(lnbuf + off, bufpos, len - off); 176 off = len; 177 if (grep_refill(f) != 0) 178 goto error; 179 if (bufrem == 0) 180 /* EOF: return partial line */ 181 break; 182 if ((p = memchr(bufpos, line_sep, bufrem)) == NULL) 183 continue; 184 /* got it: finish up the line (like code above) */ 185 ++p; 186 diff = p - bufpos; 187 len += diff; 188 if (grep_lnbufgrow(len)) 189 goto error; 190 memcpy(lnbuf + off, bufpos, diff); 191 bufrem -= diff; 192 bufpos = p; 193 break; 194 } 195 *lenp = len; 196 return ((char *)lnbuf); 197 198 error: 199 *lenp = 0; 200 return (NULL); 201 } 202 203 static inline struct file * 204 grep_file_init(struct file *f) 205 { 206 207 #ifndef __ANDROID__ 208 if (filebehave == FILE_GZIP && 209 (gzbufdesc = gzdopen(f->fd, "r")) == NULL) 210 goto error; 211 212 if (filebehave == FILE_BZIP && 213 (bzbufdesc = BZ2_bzdopen(f->fd, "r")) == NULL) 214 goto error; 215 #endif 216 217 /* Fill read buffer, also catches errors early */ 218 if (grep_refill(f) != 0) 219 goto error; 220 221 /* Check for binary stuff, if necessary */ 222 if (!nulldataflag && binbehave != BINFILE_TEXT && 223 memchr(bufpos, '\0', bufrem) != NULL) 224 f->binary = true; 225 226 return (f); 227 error: 228 close(f->fd); 229 free(f); 230 return (NULL); 231 } 232 233 /* 234 * Opens a file for processing. 235 */ 236 struct file * 237 grep_open(const char *path) 238 { 239 struct file *f; 240 241 f = grep_malloc(sizeof *f); 242 memset(f, 0, sizeof *f); 243 if (path == NULL) { 244 /* Processing stdin implies --line-buffered. */ 245 lbflag = true; 246 f->fd = STDIN_FILENO; 247 } else if ((f->fd = open(path, O_RDONLY)) == -1) { 248 free(f); 249 return (NULL); 250 } 251 252 return (grep_file_init(f)); 253 } 254 255 /* 256 * Closes a file. 257 */ 258 void 259 grep_close(struct file *f) 260 { 261 262 close(f->fd); 263 264 /* Reset read buffer and line buffer */ 265 bufpos = buffer; 266 bufrem = 0; 267 268 free(lnbuf); 269 lnbuf = NULL; 270 lnbuflen = 0; 271 } 272
