1 /* $NetBSD: cat.c,v 1.57 2016/06/16 00:52:37 sevan Exp $ */ 2 3 /* 4 * Copyright (c) 1989, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Kevin Fall. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 #if HAVE_NBTOOL_CONFIG_H 36 #include "nbtool_config.h" 37 #endif 38 39 #include <sys/cdefs.h> 40 #if !defined(lint) 41 __COPYRIGHT( 42 "@(#) Copyright (c) 1989, 1993\ 43 The Regents of the University of California. All rights reserved."); 44 #if 0 45 static char sccsid[] = "@(#)cat.c 8.2 (Berkeley) 4/27/95"; 46 #else 47 __RCSID("$NetBSD: cat.c,v 1.57 2016/06/16 00:52:37 sevan Exp $"); 48 #endif 49 #endif /* not lint */ 50 51 #include <sys/param.h> 52 #include <sys/stat.h> 53 54 #include <ctype.h> 55 #include <err.h> 56 #include <errno.h> 57 #include <fcntl.h> 58 #include <locale.h> 59 #include <stdio.h> 60 #include <stdlib.h> 61 #include <string.h> 62 #include <unistd.h> 63 64 static int bflag, eflag, fflag, lflag, nflag, sflag, tflag, vflag; 65 static size_t bsize; 66 static int rval; 67 static const char *filename; 68 69 void cook_args(char *argv[]); 70 void cook_buf(FILE *); 71 void raw_args(char *argv[]); 72 void raw_cat(int); 73 74 int 75 main(int argc, char *argv[]) 76 { 77 int ch; 78 struct flock stdout_lock; 79 80 setprogname(argv[0]); 81 (void)setlocale(LC_ALL, ""); 82 83 while ((ch = getopt(argc, argv, "B:beflnstuv")) != -1) 84 switch (ch) { 85 case 'B': 86 bsize = (size_t)strtol(optarg, NULL, 0); 87 break; 88 case 'b': 89 bflag = nflag = 1; /* -b implies -n */ 90 break; 91 case 'e': 92 eflag = vflag = 1; /* -e implies -v */ 93 break; 94 case 'f': 95 fflag = 1; 96 break; 97 case 'l': 98 lflag = 1; 99 break; 100 case 'n': 101 nflag = 1; 102 break; 103 case 's': 104 sflag = 1; 105 break; 106 case 't': 107 tflag = vflag = 1; /* -t implies -v */ 108 break; 109 case 'u': 110 setbuf(stdout, NULL); 111 break; 112 case 'v': 113 vflag = 1; 114 break; 115 default: 116 case '?': 117 (void)fprintf(stderr, 118 "Usage: %s [-beflnstuv] [-B bsize] [-] " 119 "[file ...]\n", getprogname()); 120 return EXIT_FAILURE; 121 } 122 argv += optind; 123 124 if (lflag) { 125 stdout_lock.l_len = 0; 126 stdout_lock.l_start = 0; 127 stdout_lock.l_type = F_WRLCK; 128 stdout_lock.l_whence = SEEK_SET; 129 if (fcntl(STDOUT_FILENO, F_SETLKW, &stdout_lock) == -1) 130 err(EXIT_FAILURE, "stdout"); 131 } 132 133 if (bflag || eflag || nflag || sflag || tflag || vflag) 134 cook_args(argv); 135 else 136 raw_args(argv); 137 if (fclose(stdout)) 138 err(EXIT_FAILURE, "stdout"); 139 return rval; 140 } 141 142 void 143 cook_args(char **argv) 144 { 145 FILE *fp; 146 147 fp = stdin; 148 filename = "stdin"; 149 do { 150 if (*argv) { 151 if (!strcmp(*argv, "-")) 152 fp = stdin; 153 else if ((fp = fopen(*argv, 154 fflag ? "rf" : "r")) == NULL) { 155 warn("%s", *argv); 156 rval = EXIT_FAILURE; 157 ++argv; 158 continue; 159 } 160 filename = *argv++; 161 } 162 cook_buf(fp); 163 if (fp != stdin) 164 (void)fclose(fp); 165 else 166 clearerr(fp); 167 } while (*argv); 168 } 169 170 void 171 cook_buf(FILE *fp) 172 { 173 int ch, gobble, line, prev; 174 175 line = gobble = 0; 176 for (prev = '\n'; (ch = getc(fp)) != EOF; prev = ch) { 177 if (prev == '\n') { 178 if (sflag) { 179 if (ch == '\n') { 180 if (gobble) 181 continue; 182 gobble = 1; 183 } else 184 gobble = 0; 185 } 186 if (nflag) { 187 if (!bflag || ch != '\n') { 188 (void)fprintf(stdout, 189 "%6d\t", ++line); 190 if (ferror(stdout)) 191 break; 192 } else if (eflag) { 193 (void)fprintf(stdout, 194 "%6s\t", ""); 195 if (ferror(stdout)) 196 break; 197 } 198 } 199 } 200 if (ch == '\n') { 201 if (eflag) 202 if (putchar('$') == EOF) 203 break; 204 } else if (ch == '\t') { 205 if (tflag) { 206 if (putchar('^') == EOF || putchar('I') == EOF) 207 break; 208 continue; 209 } 210 } else if (vflag) { 211 if (!isascii(ch)) { 212 if (putchar('M') == EOF || putchar('-') == EOF) 213 break; 214 ch = toascii(ch); 215 } 216 if (iscntrl(ch)) { 217 if (putchar('^') == EOF || 218 putchar(ch == '\177' ? '?' : 219 ch | 0100) == EOF) 220 break; 221 continue; 222 } 223 } 224 if (putchar(ch) == EOF) 225 break; 226 } 227 if (ferror(fp)) { 228 warn("%s", filename); 229 rval = EXIT_FAILURE; 230 clearerr(fp); 231 } 232 if (ferror(stdout)) 233 err(EXIT_FAILURE, "stdout"); 234 } 235 236 void 237 raw_args(char **argv) 238 { 239 int fd; 240 241 fd = fileno(stdin); 242 filename = "stdin"; 243 do { 244 if (*argv) { 245 if (!strcmp(*argv, "-")) { 246 fd = fileno(stdin); 247 if (fd < 0) 248 goto skip; 249 } else if (fflag) { 250 struct stat st; 251 fd = open(*argv, O_RDONLY|O_NONBLOCK, 0); 252 if (fd < 0) 253 goto skip; 254 255 if (fstat(fd, &st) == -1) { 256 close(fd); 257 goto skip; 258 } 259 if (!S_ISREG(st.st_mode)) { 260 close(fd); 261 warnx("%s: not a regular file", *argv); 262 goto skipnomsg; 263 } 264 } 265 else if ((fd = open(*argv, O_RDONLY, 0)) < 0) { 266 skip: 267 warn("%s", *argv); 268 skipnomsg: 269 rval = EXIT_FAILURE; 270 ++argv; 271 continue; 272 } 273 filename = *argv++; 274 } else if (fd < 0) { 275 err(EXIT_FAILURE, "stdin"); 276 } 277 raw_cat(fd); 278 if (fd != fileno(stdin)) 279 (void)close(fd); 280 } while (*argv); 281 } 282 283 void 284 raw_cat(int rfd) 285 { 286 static char *buf; 287 static char fb_buf[BUFSIZ]; 288 289 ssize_t nr, nw, off; 290 int wfd; 291 292 wfd = fileno(stdout); 293 if (wfd < 0) 294 err(EXIT_FAILURE, "stdout"); 295 if (buf == NULL) { 296 struct stat sbuf; 297 298 if (bsize == 0) { 299 if (fstat(wfd, &sbuf) == 0 && sbuf.st_blksize > 0 && 300 (size_t)sbuf.st_blksize > sizeof(fb_buf)) 301 bsize = sbuf.st_blksize; 302 } 303 if (bsize > sizeof(fb_buf)) { 304 buf = malloc(bsize); 305 if (buf == NULL) 306 warnx("malloc, using %zu buffer", bsize); 307 } 308 if (buf == NULL) { 309 bsize = sizeof(fb_buf); 310 buf = fb_buf; 311 } 312 } 313 while ((nr = read(rfd, buf, bsize)) > 0) 314 for (off = 0; nr; nr -= nw, off += nw) 315 if ((nw = write(wfd, buf + off, (size_t)nr)) < 0) 316 err(EXIT_FAILURE, "stdout"); 317 if (nr < 0) { 318 warn("%s", filename); 319 rval = EXIT_FAILURE; 320 } 321 } 322