1 /* $NetBSD: cat.c,v 1.55 2015/07/25 16:17:01 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 1.55 2015/07/25 16:17:01 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 (void)fprintf(stderr, 117 "Usage: %s [-beflnstuv] [-B bsize] [-] " 118 "[file ...]\n", getprogname()); 119 return EXIT_FAILURE; 120 } 121 argv += optind; 122 123 if (lflag) { 124 stdout_lock.l_len = 0; 125 stdout_lock.l_start = 0; 126 stdout_lock.l_type = F_WRLCK; 127 stdout_lock.l_whence = SEEK_SET; 128 if (fcntl(STDOUT_FILENO, F_SETLKW, &stdout_lock) == -1) 129 err(EXIT_FAILURE, "stdout"); 130 } 131 132 if (bflag || eflag || nflag || sflag || tflag || vflag) 133 cook_args(argv); 134 else 135 raw_args(argv); 136 if (fclose(stdout)) 137 err(EXIT_FAILURE, "stdout"); 138 return rval; 139 } 140 141 void 142 cook_args(char **argv) 143 { 144 FILE *fp; 145 146 fp = stdin; 147 filename = "stdin"; 148 do { 149 if (*argv) { 150 if (!strcmp(*argv, "-")) 151 fp = stdin; 152 else if ((fp = fopen(*argv, 153 fflag ? "rf" : "r")) == NULL) { 154 warn("%s", *argv); 155 rval = EXIT_FAILURE; 156 ++argv; 157 continue; 158 } 159 filename = *argv++; 160 } 161 cook_buf(fp); 162 if (fp != stdin) 163 (void)fclose(fp); 164 else 165 clearerr(fp); 166 } while (*argv); 167 } 168 169 void 170 cook_buf(FILE *fp) 171 { 172 int ch, gobble, line, prev; 173 174 line = gobble = 0; 175 for (prev = '\n'; (ch = getc(fp)) != EOF; prev = ch) { 176 if (prev == '\n') { 177 if (ch == '\n') { 178 if (sflag) { 179 if (!gobble && nflag && !bflag) 180 (void)fprintf(stdout, 181 "%6d\t\n", ++line); 182 else if (!gobble && putchar(ch) == EOF) 183 break; 184 gobble = 1; 185 continue; 186 } 187 if (nflag) { 188 if (!bflag) { 189 (void)fprintf(stdout, 190 "%6d\t", ++line); 191 if (ferror(stdout)) 192 break; 193 } else if (eflag) { 194 (void)fprintf(stdout, 195 "%6s\t", ""); 196 if (ferror(stdout)) 197 break; 198 } 199 } 200 } else if (nflag) { 201 (void)fprintf(stdout, "%6d\t", ++line); 202 if (ferror(stdout)) 203 break; 204 } 205 } 206 gobble = 0; 207 if (ch == '\n') { 208 if (eflag) 209 if (putchar('$') == EOF) 210 break; 211 } else if (ch == '\t') { 212 if (tflag) { 213 if (putchar('^') == EOF || putchar('I') == EOF) 214 break; 215 continue; 216 } 217 } else if (vflag) { 218 if (!isascii(ch)) { 219 if (putchar('M') == EOF || putchar('-') == EOF) 220 break; 221 ch = toascii(ch); 222 } 223 if (iscntrl(ch)) { 224 if (putchar('^') == EOF || 225 putchar(ch == '\177' ? '?' : 226 ch | 0100) == EOF) 227 break; 228 continue; 229 } 230 } 231 if (putchar(ch) == EOF) 232 break; 233 } 234 if (ferror(fp)) { 235 warn("%s", filename); 236 rval = EXIT_FAILURE; 237 clearerr(fp); 238 } 239 if (ferror(stdout)) 240 err(EXIT_FAILURE, "stdout"); 241 } 242 243 void 244 raw_args(char **argv) 245 { 246 int fd; 247 248 fd = fileno(stdin); 249 filename = "stdin"; 250 do { 251 if (*argv) { 252 if (!strcmp(*argv, "-")) { 253 fd = fileno(stdin); 254 if (fd < 0) 255 goto skip; 256 } else if (fflag) { 257 struct stat st; 258 fd = open(*argv, O_RDONLY|O_NONBLOCK, 0); 259 if (fd < 0) 260 goto skip; 261 262 if (fstat(fd, &st) == -1) { 263 close(fd); 264 goto skip; 265 } 266 if (!S_ISREG(st.st_mode)) { 267 close(fd); 268 warnx("%s: not a regular file", *argv); 269 goto skipnomsg; 270 } 271 } 272 else if ((fd = open(*argv, O_RDONLY, 0)) < 0) { 273 skip: 274 warn("%s", *argv); 275 skipnomsg: 276 rval = EXIT_FAILURE; 277 ++argv; 278 continue; 279 } 280 filename = *argv++; 281 } else if (fd < 0) { 282 err(EXIT_FAILURE, "stdin"); 283 } 284 raw_cat(fd); 285 if (fd != fileno(stdin)) 286 (void)close(fd); 287 } while (*argv); 288 } 289 290 void 291 raw_cat(int rfd) 292 { 293 static char *buf; 294 static char fb_buf[BUFSIZ]; 295 296 ssize_t nr, nw, off; 297 int wfd; 298 299 wfd = fileno(stdout); 300 if (wfd < 0) 301 err(EXIT_FAILURE, "stdout"); 302 if (buf == NULL) { 303 struct stat sbuf; 304 305 if (bsize == 0) { 306 if (fstat(wfd, &sbuf) == 0 && sbuf.st_blksize > 0 && 307 (size_t)sbuf.st_blksize > sizeof(fb_buf)) 308 bsize = sbuf.st_blksize; 309 } 310 if (bsize > sizeof(fb_buf)) { 311 buf = malloc(bsize); 312 if (buf == NULL) 313 warnx("malloc, using %zu buffer", bsize); 314 } 315 if (buf == NULL) { 316 bsize = sizeof(fb_buf); 317 buf = fb_buf; 318 } 319 } 320 while ((nr = read(rfd, buf, bsize)) > 0) 321 for (off = 0; nr; nr -= nw, off += nw) 322 if ((nw = write(wfd, buf + off, (size_t)nr)) < 0) 323 err(EXIT_FAILURE, "stdout"); 324 if (nr < 0) { 325 warn("%s", filename); 326 rval = EXIT_FAILURE; 327 } 328 } 329