1 /* $NetBSD: cat.c,v 1.60 2023/12/10 15:31:53 rillig 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 1.60 2023/12/10 15:31:53 rillig 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 static void cook_args(char *argv[]); 70 static void cook_buf(FILE *); 71 static void raw_args(char *argv[]); 72 static 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 static 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 static 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, "%6d\t", ++line); 189 if (ferror(stdout)) 190 break; 191 } else if (eflag) { 192 (void)fprintf(stdout, "%6s\t", ""); 193 if (ferror(stdout)) 194 break; 195 } 196 } 197 } 198 if (ch == '\n') { 199 if (eflag) 200 if (putchar('$') == EOF) 201 break; 202 } else if (ch == '\t') { 203 if (tflag) { 204 if (putchar('^') == EOF || putchar('I') == EOF) 205 break; 206 continue; 207 } 208 } else if (vflag) { 209 if (!isascii(ch)) { 210 if (putchar('M') == EOF || putchar('-') == EOF) 211 break; 212 ch = toascii(ch); 213 } 214 if (iscntrl(ch)) { 215 if (putchar('^') == EOF || 216 putchar(ch == '\177' ? '?' : 217 ch | 0100) == EOF) 218 break; 219 continue; 220 } 221 } 222 if (putchar(ch) == EOF) 223 break; 224 } 225 if (ferror(fp)) { 226 warn("%s", filename); 227 rval = EXIT_FAILURE; 228 clearerr(fp); 229 } 230 if (ferror(stdout)) 231 err(EXIT_FAILURE, "stdout"); 232 } 233 234 static void 235 raw_args(char **argv) 236 { 237 int fd; 238 239 fd = fileno(stdin); 240 filename = "stdin"; 241 do { 242 if (*argv) { 243 if (!strcmp(*argv, "-")) { 244 fd = fileno(stdin); 245 if (fd < 0) 246 goto skip; 247 } else if (fflag) { 248 struct stat st; 249 fd = open(*argv, O_RDONLY|O_NONBLOCK, 0); 250 if (fd < 0) 251 goto skip; 252 253 if (fstat(fd, &st) == -1) { 254 close(fd); 255 goto skip; 256 } 257 if (!S_ISREG(st.st_mode)) { 258 close(fd); 259 warnx("%s: not a regular file", *argv); 260 goto skipnomsg; 261 } 262 } 263 else if ((fd = open(*argv, O_RDONLY, 0)) < 0) { 264 skip: 265 warn("%s", *argv); 266 skipnomsg: 267 rval = EXIT_FAILURE; 268 ++argv; 269 continue; 270 } 271 filename = *argv++; 272 } else if (fd < 0) { 273 err(EXIT_FAILURE, "stdin"); 274 } 275 raw_cat(fd); 276 if (fd != fileno(stdin)) 277 (void)close(fd); 278 } while (*argv); 279 } 280 281 static void 282 raw_cat(int rfd) 283 { 284 static char *buf; 285 static char fb_buf[BUFSIZ]; 286 287 ssize_t nr, nw, off; 288 int wfd; 289 290 wfd = fileno(stdout); 291 if (wfd < 0) 292 err(EXIT_FAILURE, "stdout"); 293 if (buf == NULL) { 294 struct stat sbuf; 295 296 if (bsize == 0) { 297 if (fstat(wfd, &sbuf) == 0 && sbuf.st_blksize > 0 && 298 (size_t)sbuf.st_blksize > sizeof(fb_buf)) 299 bsize = sbuf.st_blksize; 300 } 301 if (bsize > sizeof(fb_buf)) { 302 buf = malloc(bsize); 303 if (buf == NULL) 304 warnx("malloc, using %zu buffer", bsize); 305 } 306 if (buf == NULL) { 307 bsize = sizeof(fb_buf); 308 buf = fb_buf; 309 } 310 } 311 while ((nr = read(rfd, buf, bsize)) > 0) 312 for (off = 0; nr; nr -= nw, off += nw) 313 if ((nw = write(wfd, buf + off, (size_t)nr)) < 0) 314 err(EXIT_FAILURE, "stdout"); 315 if (nr < 0) { 316 warn("%s", filename); 317 rval = EXIT_FAILURE; 318 } 319 } 320
Indexes created Sun Oct 25 00:26:45 UTC 2026