1 /* $OpenBSD: cat.c,v 1.20 2009/10/27 23:59:19 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/param.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 extern char *__progname; 50 51 int bflag, eflag, nflag, sflag, tflag, vflag; 52 int rval; 53 char *filename; 54 55 void cook_args(char *argv[]); 56 void cook_buf(FILE *); 57 void raw_args(char *argv[]); 58 void raw_cat(int); 59 60 int 61 main(int argc, char *argv[]) 62 { 63 int ch; 64 65 setlocale(LC_ALL, ""); 66 67 while ((ch = getopt(argc, argv, "benstuv")) != -1) 68 switch (ch) { 69 case 'b': 70 bflag = nflag = 1; /* -b implies -n */ 71 break; 72 case 'e': 73 eflag = vflag = 1; /* -e implies -v */ 74 break; 75 case 'n': 76 nflag = 1; 77 break; 78 case 's': 79 sflag = 1; 80 break; 81 case 't': 82 tflag = vflag = 1; /* -t implies -v */ 83 break; 84 case 'u': 85 setbuf(stdout, NULL); 86 break; 87 case 'v': 88 vflag = 1; 89 break; 90 default: 91 (void)fprintf(stderr, 92 "usage: %s [-benstuv] [file ...]\n", __progname); 93 exit(1); 94 /* NOTREACHED */ 95 } 96 argv += optind; 97 98 if (bflag || eflag || nflag || sflag || tflag || vflag) 99 cook_args(argv); 100 else 101 raw_args(argv); 102 if (fclose(stdout)) 103 err(1, "stdout"); 104 exit(rval); 105 /* NOTREACHED */ 106 } 107 108 void 109 cook_args(char **argv) 110 { 111 FILE *fp; 112 113 fp = stdin; 114 filename = "stdin"; 115 do { 116 if (*argv) { 117 if (!strcmp(*argv, "-")) 118 fp = stdin; 119 else if ((fp = fopen(*argv, "r")) == NULL) { 120 warn("%s", *argv); 121 rval = 1; 122 ++argv; 123 continue; 124 } 125 filename = *argv++; 126 } 127 cook_buf(fp); 128 if (fp == stdin) 129 clearerr(fp); 130 else 131 (void)fclose(fp); 132 } while (*argv); 133 } 134 135 void 136 cook_buf(FILE *fp) 137 { 138 int ch, gobble, line, prev; 139 140 line = gobble = 0; 141 for (prev = '\n'; (ch = getc(fp)) != EOF; prev = ch) { 142 if (prev == '\n') { 143 if (sflag) { 144 if (ch == '\n') { 145 if (gobble) 146 continue; 147 gobble = 1; 148 } else 149 gobble = 0; 150 } 151 if (nflag && (!bflag || ch != '\n')) { 152 (void)fprintf(stdout, "%6d\t", ++line); 153 if (ferror(stdout)) 154 break; 155 } 156 } 157 if (ch == '\n') { 158 if (eflag && putchar('$') == EOF) 159 break; 160 } else if (ch == '\t') { 161 if (tflag) { 162 if (putchar('^') == EOF || putchar('I') == EOF) 163 break; 164 continue; 165 } 166 } else if (vflag) { 167 if (!isascii(ch)) { 168 if (putchar('M') == EOF || putchar('-') == EOF) 169 break; 170 ch = toascii(ch); 171 } 172 if (iscntrl(ch)) { 173 if (putchar('^') == EOF || 174 putchar(ch == '\177' ? '?' : 175 ch | 0100) == EOF) 176 break; 177 continue; 178 } 179 } 180 if (putchar(ch) == EOF) 181 break; 182 } 183 if (ferror(fp)) { 184 warn("%s", filename); 185 rval = 1; 186 clearerr(fp); 187 } 188 if (ferror(stdout)) 189 err(1, "stdout"); 190 } 191 192 void 193 raw_args(char **argv) 194 { 195 int fd; 196 197 fd = fileno(stdin); 198 filename = "stdin"; 199 do { 200 if (*argv) { 201 if (!strcmp(*argv, "-")) 202 fd = fileno(stdin); 203 else if ((fd = open(*argv, O_RDONLY, 0)) < 0) { 204 warn("%s", *argv); 205 rval = 1; 206 ++argv; 207 continue; 208 } 209 filename = *argv++; 210 } 211 raw_cat(fd); 212 if (fd != fileno(stdin)) 213 (void)close(fd); 214 } while (*argv); 215 } 216 217 void 218 raw_cat(int rfd) 219 { 220 int wfd; 221 ssize_t nr, nw, off; 222 static size_t bsize; 223 static char *buf = NULL; 224 struct stat sbuf; 225 226 wfd = fileno(stdout); 227 if (buf == NULL) { 228 if (fstat(wfd, &sbuf)) 229 err(1, "stdout"); 230 bsize = MAX(sbuf.st_blksize, BUFSIZ); 231 if ((buf = malloc(bsize)) == NULL) 232 err(1, "malloc"); 233 } 234 while ((nr = read(rfd, buf, bsize)) != -1 && nr != 0) 235 for (off = 0; nr; nr -= nw, off += nw) 236 if ((nw = write(wfd, buf + off, (size_t)nr)) == 0 || 237 nw == -1) 238 err(1, "stdout"); 239 if (nr < 0) { 240 warn("%s", filename); 241 rval = 1; 242 } 243 } 244