1 /* $OpenBSD: cat.c,v 1.21 2015/01/16 06:39:28 deraadt 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 while ((ch = getopt(argc, argv, "benstuv")) != -1) 70 switch (ch) { 71 case 'b': 72 bflag = nflag = 1; /* -b implies -n */ 73 break; 74 case 'e': 75 eflag = vflag = 1; /* -e implies -v */ 76 break; 77 case 'n': 78 nflag = 1; 79 break; 80 case 's': 81 sflag = 1; 82 break; 83 case 't': 84 tflag = vflag = 1; /* -t implies -v */ 85 break; 86 case 'u': 87 setbuf(stdout, NULL); 88 break; 89 case 'v': 90 vflag = 1; 91 break; 92 default: 93 (void)fprintf(stderr, 94 "usage: %s [-benstuv] [file ...]\n", __progname); 95 exit(1); 96 /* NOTREACHED */ 97 } 98 argv += optind; 99 100 if (bflag || eflag || nflag || sflag || tflag || vflag) 101 cook_args(argv); 102 else 103 raw_args(argv); 104 if (fclose(stdout)) 105 err(1, "stdout"); 106 exit(rval); 107 /* NOTREACHED */ 108 } 109 110 void 111 cook_args(char **argv) 112 { 113 FILE *fp; 114 115 fp = stdin; 116 filename = "stdin"; 117 do { 118 if (*argv) { 119 if (!strcmp(*argv, "-")) 120 fp = stdin; 121 else if ((fp = fopen(*argv, "r")) == NULL) { 122 warn("%s", *argv); 123 rval = 1; 124 ++argv; 125 continue; 126 } 127 filename = *argv++; 128 } 129 cook_buf(fp); 130 if (fp == stdin) 131 clearerr(fp); 132 else 133 (void)fclose(fp); 134 } while (*argv); 135 } 136 137 void 138 cook_buf(FILE *fp) 139 { 140 int ch, gobble, line, prev; 141 142 line = gobble = 0; 143 for (prev = '\n'; (ch = getc(fp)) != EOF; prev = ch) { 144 if (prev == '\n') { 145 if (sflag) { 146 if (ch == '\n') { 147 if (gobble) 148 continue; 149 gobble = 1; 150 } else 151 gobble = 0; 152 } 153 if (nflag && (!bflag || ch != '\n')) { 154 (void)fprintf(stdout, "%6d\t", ++line); 155 if (ferror(stdout)) 156 break; 157 } 158 } 159 if (ch == '\n') { 160 if (eflag && putchar('$') == EOF) 161 break; 162 } else if (ch == '\t') { 163 if (tflag) { 164 if (putchar('^') == EOF || putchar('I') == EOF) 165 break; 166 continue; 167 } 168 } else if (vflag) { 169 if (!isascii(ch)) { 170 if (putchar('M') == EOF || putchar('-') == EOF) 171 break; 172 ch = toascii(ch); 173 } 174 if (iscntrl(ch)) { 175 if (putchar('^') == EOF || 176 putchar(ch == '\177' ? '?' : 177 ch | 0100) == EOF) 178 break; 179 continue; 180 } 181 } 182 if (putchar(ch) == EOF) 183 break; 184 } 185 if (ferror(fp)) { 186 warn("%s", filename); 187 rval = 1; 188 clearerr(fp); 189 } 190 if (ferror(stdout)) 191 err(1, "stdout"); 192 } 193 194 void 195 raw_args(char **argv) 196 { 197 int fd; 198 199 fd = fileno(stdin); 200 filename = "stdin"; 201 do { 202 if (*argv) { 203 if (!strcmp(*argv, "-")) 204 fd = fileno(stdin); 205 else if ((fd = open(*argv, O_RDONLY, 0)) < 0) { 206 warn("%s", *argv); 207 rval = 1; 208 ++argv; 209 continue; 210 } 211 filename = *argv++; 212 } 213 raw_cat(fd); 214 if (fd != fileno(stdin)) 215 (void)close(fd); 216 } while (*argv); 217 } 218 219 void 220 raw_cat(int rfd) 221 { 222 int wfd; 223 ssize_t nr, nw, off; 224 static size_t bsize; 225 static char *buf = NULL; 226 struct stat sbuf; 227 228 wfd = fileno(stdout); 229 if (buf == NULL) { 230 if (fstat(wfd, &sbuf)) 231 err(1, "stdout"); 232 bsize = MAXIMUM(sbuf.st_blksize, BUFSIZ); 233 if ((buf = malloc(bsize)) == NULL) 234 err(1, "malloc"); 235 } 236 while ((nr = read(rfd, buf, bsize)) != -1 && nr != 0) 237 for (off = 0; nr; nr -= nw, off += nw) 238 if ((nw = write(wfd, buf + off, (size_t)nr)) == 0 || 239 nw == -1) 240 err(1, "stdout"); 241 if (nr < 0) { 242 warn("%s", filename); 243 rval = 1; 244 } 245 } 246