cat.c revision 1.26
1/* $OpenBSD: cat.c,v 1.26 2016/10/19 18:20:25 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 <stdio.h> 44#include <stdlib.h> 45#include <string.h> 46#include <unistd.h> 47 48#define MAXIMUM(a, b) (((a) > (b)) ? (a) : (b)) 49 50extern char *__progname; 51 52int bflag, eflag, nflag, sflag, tflag, vflag; 53int rval; 54char *filename; 55 56void cook_args(char *argv[]); 57void cook_buf(FILE *); 58void raw_args(char *argv[]); 59void raw_cat(int); 60 61int 62main(int argc, char *argv[]) 63{ 64 int ch; 65 66 if (pledge("stdio rpath", NULL) == -1) 67 err(1, "pledge"); 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 setvbuf(stdout, NULL, _IONBF, 0); 88 break; 89 case 'v': 90 vflag = 1; 91 break; 92 default: 93 (void)fprintf(stderr, 94 "usage: %s [-benstuv] [file ...]\n", __progname); 95 return 1; 96 } 97 argv += optind; 98 99 if (bflag || eflag || nflag || sflag || tflag || vflag) 100 cook_args(argv); 101 else 102 raw_args(argv); 103 if (fclose(stdout)) 104 err(1, "stdout"); 105 return rval; 106} 107 108void 109cook_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 135void 136cook_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) { 152 if (!bflag || ch != '\n') { 153 (void)fprintf(stdout, "%6d\t", ++line); 154 if (ferror(stdout)) 155 break; 156 } else if (eflag) { 157 (void)fprintf(stdout, "%6s\t", ""); 158 if (ferror(stdout)) 159 break; 160 } 161 } 162 } 163 if (ch == '\n') { 164 if (eflag && putchar('$') == EOF) 165 break; 166 } else if (ch == '\t') { 167 if (tflag) { 168 if (putchar('^') == EOF || putchar('I') == EOF) 169 break; 170 continue; 171 } 172 } else if (vflag) { 173 if (!isascii(ch)) { 174 if (putchar('M') == EOF || putchar('-') == EOF) 175 break; 176 ch = toascii(ch); 177 } 178 if (iscntrl(ch)) { 179 if (putchar('^') == EOF || 180 putchar(ch == '\177' ? '?' : 181 ch | 0100) == EOF) 182 break; 183 continue; 184 } 185 } 186 if (putchar(ch) == EOF) 187 break; 188 } 189 if (ferror(fp)) { 190 warn("%s", filename); 191 rval = 1; 192 clearerr(fp); 193 } 194 if (ferror(stdout)) 195 err(1, "stdout"); 196} 197 198void 199raw_args(char **argv) 200{ 201 int fd; 202 203 fd = fileno(stdin); 204 filename = "stdin"; 205 do { 206 if (*argv) { 207 if (!strcmp(*argv, "-")) 208 fd = fileno(stdin); 209 else if ((fd = open(*argv, O_RDONLY, 0)) < 0) { 210 warn("%s", *argv); 211 rval = 1; 212 ++argv; 213 continue; 214 } 215 filename = *argv++; 216 } 217 raw_cat(fd); 218 if (fd != fileno(stdin)) 219 (void)close(fd); 220 } while (*argv); 221} 222 223void 224raw_cat(int rfd) 225{ 226 int wfd; 227 ssize_t nr, nw, off; 228 static size_t bsize; 229 static char *buf = NULL; 230 struct stat sbuf; 231 232 wfd = fileno(stdout); 233 if (buf == NULL) { 234 if (fstat(wfd, &sbuf)) 235 err(1, "stdout"); 236 bsize = MAXIMUM(sbuf.st_blksize, BUFSIZ); 237 if ((buf = malloc(bsize)) == NULL) 238 err(1, "malloc"); 239 } 240 while ((nr = read(rfd, buf, bsize)) != -1 && nr != 0) 241 for (off = 0; nr; nr -= nw, off += nw) 242 if ((nw = write(wfd, buf + off, (size_t)nr)) == 0 || 243 nw == -1) 244 err(1, "stdout"); 245 if (nr < 0) { 246 warn("%s", filename); 247 rval = 1; 248 } 249} 250