1 /* $OpenBSD: cat.c,v 1.25 2016/07/01 22:40:44 schwarze Exp $ */ 2 /* $NetBSD: cat.c,v 1.11 1995/09/07 06:12:54 jtc Exp $ */ 3 4 /* 5 * Copyright (c) 1989, 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * This code is derived from software contributed to Berkeley by 9 * Kevin Fall. 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 * 3. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include <sys/types.h> 37 #include <sys/stat.h> 38 39 #include <ctype.h> 40 #include <err.h> 41 #include <errno.h> 42 #include <fcntl.h> 43 #include <locale.h> 44 #include <stdio.h> 45 #include <stdlib.h> 46 #include <string.h> 47 #include <unistd.h> 48 49 #define MAXIMUM(a, b) (((a) > (b)) ? (a) : (b)) 50 51 extern char *__progname; 52 53 int bflag, eflag, nflag, sflag, tflag, vflag; 54 int rval; 55 char *filename; 56 57 void cook_args(char *argv[]); 58 void cook_buf(FILE *); 59 void raw_args(char *argv[]); 60 void raw_cat(int); 61 62 int 63 main(int argc, char *argv[]) 64 { 65 int ch; 66 67 setlocale(LC_ALL, ""); 68 69 if (pledge("stdio rpath", NULL) == -1) 70 err(1, "pledge"); 71 72 while ((ch = getopt(argc, argv, "benstuv")) != -1) 73 switch (ch) { 74 case 'b': 75 bflag = nflag = 1; /* -b implies -n */ 76 break; 77 case 'e': 78 eflag = vflag = 1; /* -e implies -v */ 79 break; 80 case 'n': 81 nflag = 1; 82 break; 83 case 's': 84 sflag = 1; 85 break; 86 case 't': 87 tflag = vflag = 1; /* -t implies -v */ 88 break; 89 case 'u': 90 setvbuf(stdout, NULL, _IONBF, 0); 91 break; 92 case 'v': 93 vflag = 1; 94 break; 95 default: 96 (void)fprintf(stderr, 97 "usage: %s [-benstuv] [file ...]\n", __progname); 98 exit(1); 99 /* NOTREACHED */ 100 } 101 argv += optind; 102 103 if (bflag || eflag || nflag || sflag || tflag || vflag) 104 cook_args(argv); 105 else 106 raw_args(argv); 107 if (fclose(stdout)) 108 err(1, "stdout"); 109 exit(rval); 110 /* NOTREACHED */ 111 } 112 113 void 114 cook_args(char **argv) 115 { 116 FILE *fp; 117 118 fp = stdin; 119 filename = "stdin"; 120 do { 121 if (*argv) { 122 if (!strcmp(*argv, "-")) 123 fp = stdin; 124 else if ((fp = fopen(*argv, "r")) == NULL) { 125 warn("%s", *argv); 126 rval = 1; 127 ++argv; 128 continue; 129 } 130 filename = *argv++; 131 } 132 cook_buf(fp); 133 if (fp == stdin) 134 clearerr(fp); 135 else 136 (void)fclose(fp); 137 } while (*argv); 138 } 139 140 void 141 cook_buf(FILE *fp) 142 { 143 int ch, gobble, line, prev; 144 145 line = gobble = 0; 146 for (prev = '\n'; (ch = getc(fp)) != EOF; prev = ch) { 147 if (prev == '\n') { 148 if (sflag) { 149 if (ch == '\n') { 150 if (gobble) 151 continue; 152 gobble = 1; 153 } else 154 gobble = 0; 155 } 156 if (nflag) { 157 if (!bflag || ch != '\n') { 158 (void)fprintf(stdout, "%6d\t", ++line); 159 if (ferror(stdout)) 160 break; 161 } else if (eflag) { 162 (void)fprintf(stdout, "%6s\t", ""); 163 if (ferror(stdout)) 164 break; 165 } 166 } 167 } 168 if (ch == '\n') { 169 if (eflag && putchar('$') == EOF) 170 break; 171 } else if (ch == '\t') { 172 if (tflag) { 173 if (putchar('^') == EOF || putchar('I') == EOF) 174 break; 175 continue; 176 } 177 } else if (vflag) { 178 if (!isascii(ch)) { 179 if (putchar('M') == EOF || putchar('-') == EOF) 180 break; 181 ch = toascii(ch); 182 } 183 if (iscntrl(ch)) { 184 if (putchar('^') == EOF || 185 putchar(ch == '\177' ? '?' : 186 ch | 0100) == EOF) 187 break; 188 continue; 189 } 190 } 191 if (putchar(ch) == EOF) 192 break; 193 } 194 if (ferror(fp)) { 195 warn("%s", filename); 196 rval = 1; 197 clearerr(fp); 198 } 199 if (ferror(stdout)) 200 err(1, "stdout"); 201 } 202 203 void 204 raw_args(char **argv) 205 { 206 int fd; 207 208 fd = fileno(stdin); 209 filename = "stdin"; 210 do { 211 if (*argv) { 212 if (!strcmp(*argv, "-")) 213 fd = fileno(stdin); 214 else if ((fd = open(*argv, O_RDONLY, 0)) < 0) { 215 warn("%s", *argv); 216 rval = 1; 217 ++argv; 218 continue; 219 } 220 filename = *argv++; 221 } 222 raw_cat(fd); 223 if (fd != fileno(stdin)) 224 (void)close(fd); 225 } while (*argv); 226 } 227 228 void 229 raw_cat(int rfd) 230 { 231 int wfd; 232 ssize_t nr, nw, off; 233 static size_t bsize; 234 static char *buf = NULL; 235 struct stat sbuf; 236 237 wfd = fileno(stdout); 238 if (buf == NULL) { 239 if (fstat(wfd, &sbuf)) 240 err(1, "stdout"); 241 bsize = MAXIMUM(sbuf.st_blksize, BUFSIZ); 242 if ((buf = malloc(bsize)) == NULL) 243 err(1, "malloc"); 244 } 245 while ((nr = read(rfd, buf, bsize)) != -1 && nr != 0) 246 for (off = 0; nr; nr -= nw, off += nw) 247 if ((nw = write(wfd, buf + off, (size_t)nr)) == 0 || 248 nw == -1) 249 err(1, "stdout"); 250 if (nr < 0) { 251 warn("%s", filename); 252 rval = 1; 253 } 254 } 255