1 /* $NetBSD: cat.c,v 1.35 2002/09/13 18:07:52 thorpej 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. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the University of 21 * California, Berkeley and its contributors. 22 * 4. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 */ 38 39 #include <sys/cdefs.h> 40 #if defined(__COPYRIGHT) && !defined(lint) 41 __COPYRIGHT( 42 "@(#) Copyright (c) 1989, 1993\n\ 43 The Regents of the University of California. All rights reserved.\n"); 44 #endif /* not lint */ 45 46 #if defined(__RCSID) && !defined(lint) 47 #if 0 48 static char sccsid[] = "@(#)cat.c 8.2 (Berkeley) 4/27/95"; 49 #else 50 __RCSID("$NetBSD: cat.c,v 1.35 2002/09/13 18:07:52 thorpej Exp $"); 51 #endif 52 #endif /* not lint */ 53 54 #include <sys/param.h> 55 #include <sys/stat.h> 56 57 #include <ctype.h> 58 #include <err.h> 59 #include <errno.h> 60 #include <fcntl.h> 61 #include <locale.h> 62 #include <stdio.h> 63 #include <stdlib.h> 64 #include <string.h> 65 #include <unistd.h> 66 67 int bflag, eflag, fflag, lflag, nflag, sflag, tflag, vflag; 68 int rval; 69 const char *filename; 70 71 int main(int, char *[]); 72 void cook_args(char *argv[]); 73 void cook_buf(FILE *); 74 void raw_args(char *argv[]); 75 void raw_cat(int); 76 77 int 78 main(int argc, char *argv[]) 79 { 80 int ch; 81 struct flock stdout_lock; 82 83 setprogname(argv[0]); 84 (void)setlocale(LC_ALL, ""); 85 86 while ((ch = getopt(argc, argv, "beflnstuv")) != -1) 87 switch (ch) { 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: cat [-beflnstuv] [-] [file ...]\n"); 119 exit(1); 120 /* NOTREACHED */ 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(1, "stdout"); 139 exit(rval); 140 /* NOTREACHED */ 141 } 142 143 void 144 cook_args(char **argv) 145 { 146 FILE *fp; 147 148 fp = stdin; 149 filename = "stdin"; 150 do { 151 if (*argv) { 152 if (!strcmp(*argv, "-")) 153 fp = stdin; 154 else if ((fp = fopen(*argv, 155 fflag ? "rf" : "r")) == NULL) { 156 warn("%s", *argv); 157 rval = 1; 158 ++argv; 159 continue; 160 } 161 filename = *argv++; 162 } 163 cook_buf(fp); 164 if (fp != stdin) 165 (void)fclose(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 && putchar(ch) == EOF) 180 break; 181 gobble = 1; 182 continue; 183 } 184 if (nflag) { 185 if (!bflag) { 186 (void)fprintf(stdout, 187 "%6d\t", ++line); 188 if (ferror(stdout)) 189 break; 190 } else if (eflag) { 191 (void)fprintf(stdout, 192 "%6s\t", ""); 193 if (ferror(stdout)) 194 break; 195 } 196 } 197 } else if (nflag) { 198 (void)fprintf(stdout, "%6d\t", ++line); 199 if (ferror(stdout)) 200 break; 201 } 202 } 203 gobble = 0; 204 if (ch == '\n') { 205 if (eflag) 206 if (putchar('$') == EOF) 207 break; 208 } else if (ch == '\t') { 209 if (tflag) { 210 if (putchar('^') == EOF || putchar('I') == EOF) 211 break; 212 continue; 213 } 214 } else if (vflag) { 215 if (!isascii(ch)) { 216 if (putchar('M') == EOF || putchar('-') == EOF) 217 break; 218 ch = toascii(ch); 219 } 220 if (iscntrl(ch)) { 221 if (putchar('^') == EOF || 222 putchar(ch == '\177' ? '?' : 223 ch | 0100) == EOF) 224 break; 225 continue; 226 } 227 } 228 if (putchar(ch) == EOF) 229 break; 230 } 231 if (ferror(fp)) { 232 warn("%s", filename); 233 rval = 1; 234 clearerr(fp); 235 } 236 if (ferror(stdout)) 237 err(1, "stdout"); 238 } 239 240 void 241 raw_args(char **argv) 242 { 243 int fd; 244 245 fd = fileno(stdin); 246 filename = "stdin"; 247 do { 248 if (*argv) { 249 if (!strcmp(*argv, "-")) 250 fd = fileno(stdin); 251 else if (fflag) { 252 struct stat st; 253 fd = open(*argv, O_RDONLY|O_NONBLOCK, 0); 254 if (fd < 0) 255 goto skip; 256 257 if (fstat(fd, &st) == -1) { 258 close(fd); 259 goto skip; 260 } 261 if (!S_ISREG(st.st_mode)) { 262 close(fd); 263 warnx("%s: not a regular file", *argv); 264 goto skipnomsg; 265 } 266 } 267 else if ((fd = open(*argv, O_RDONLY, 0)) < 0) { 268 skip: 269 warn("%s", *argv); 270 skipnomsg: 271 rval = 1; 272 ++argv; 273 continue; 274 } 275 filename = *argv++; 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 static size_t bsize; 289 290 struct stat sbuf; 291 ssize_t nr, nw, off; 292 int wfd; 293 294 wfd = fileno(stdout); 295 if (buf == NULL) { 296 if (fstat(wfd, &sbuf) == 0) { 297 bsize = sbuf.st_blksize > BUFSIZ ? 298 sbuf.st_blksize : BUFSIZ; 299 buf = malloc(bsize); 300 } 301 if (buf == NULL) { 302 buf = fb_buf; 303 bsize = BUFSIZ; 304 } 305 } 306 while ((nr = read(rfd, buf, bsize)) > 0) 307 for (off = 0; nr; nr -= nw, off += nw) 308 if ((nw = write(wfd, buf + off, (size_t)nr)) < 0) 309 err(1, "stdout"); 310 if (nr < 0) { 311 warn("%s", filename); 312 rval = 1; 313 } 314 } 315