Initial Contribution
diff --git a/toolbox/cat.c b/toolbox/cat.c
new file mode 100644
index 0000000..6ac31f8
--- /dev/null
+++ b/toolbox/cat.c
@@ -0,0 +1,291 @@
+/* $NetBSD: cat.c,v 1.43 2004/01/04 03:31:28 jschauma Exp $ */
+
+/*
+ * Copyright (c) 1989, 1993
+ * The Regents of the University of California. All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Kevin Fall.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/param.h>
+#include <sys/stat.h>
+
+#include <ctype.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#define CAT_BUFSIZ (4096)
+
+static int bflag, eflag, fflag, lflag, nflag, sflag, tflag, vflag;
+static int rval;
+static const char *filename;
+
+static void
+cook_buf(FILE *fp)
+{
+ int ch, gobble, line, prev;
+ int stdout_err = 0;
+
+ line = gobble = 0;
+ for (prev = '\n'; (ch = getc(fp)) != EOF; prev = ch) {
+ if (prev == '\n') {
+ if (ch == '\n') {
+ if (sflag) {
+ if (!gobble && putchar(ch) == EOF)
+ break;
+ gobble = 1;
+ continue;
+ }
+ if (nflag) {
+ if (!bflag) {
+ if (fprintf(stdout,
+ "%6d\t", ++line) < 0) {
+ stdout_err++;
+ break;
+ }
+ } else if (eflag) {
+ if (fprintf(stdout,
+ "%6s\t", "") < 0) {
+ stdout_err++;
+ break;
+ }
+ }
+ }
+ } else if (nflag) {
+ if (fprintf(stdout, "%6d\t", ++line) < 0) {
+ stdout_err++;
+ break;
+ }
+ }
+ }
+ gobble = 0;
+ if (ch == '\n') {
+ if (eflag)
+ if (putchar('$') == EOF)
+ break;
+ } else if (ch == '\t') {
+ if (tflag) {
+ if (putchar('^') == EOF || putchar('I') == EOF)
+ break;
+ continue;
+ }
+ } else if (vflag) {
+ if (!isascii(ch)) {
+ if (putchar('M') == EOF || putchar('-') == EOF)
+ break;
+ ch = (ch) & 0x7f;
+ }
+ if (iscntrl(ch)) {
+ if (putchar('^') == EOF ||
+ putchar(ch == '\177' ? '?' :
+ ch | 0100) == EOF)
+ break;
+ continue;
+ }
+ }
+ if (putchar(ch) == EOF)
+ break;
+ }
+ if (stdout_err) {
+ perror(filename);
+ rval = 1;
+ }
+}
+
+static void
+cook_args(char **argv)
+{
+ FILE *fp;
+
+ fp = stdin;
+ filename = "stdin";
+ do {
+ if (*argv) {
+ if (!strcmp(*argv, "-"))
+ fp = stdin;
+ else if ((fp = fopen(*argv,
+ fflag ? "rf" : "r")) == NULL) {
+ perror("fopen");
+ rval = 1;
+ ++argv;
+ continue;
+ }
+ filename = *argv++;
+ }
+ cook_buf(fp);
+ if (fp != stdin)
+ fclose(fp);
+ } while (*argv);
+}
+
+static void
+raw_cat(int rfd)
+{
+ static char *buf;
+ static char fb_buf[CAT_BUFSIZ];
+ static size_t bsize;
+
+ struct stat sbuf;
+ ssize_t nr, nw, off;
+ int wfd;
+
+ wfd = fileno(stdout);
+ if (buf == NULL) {
+ if (fstat(wfd, &sbuf) == 0) {
+ bsize = sbuf.st_blksize > CAT_BUFSIZ ?
+ sbuf.st_blksize : CAT_BUFSIZ;
+ buf = malloc(bsize);
+ }
+ if (buf == NULL) {
+ buf = fb_buf;
+ bsize = CAT_BUFSIZ;
+ }
+ }
+ while ((nr = read(rfd, buf, bsize)) > 0)
+ for (off = 0; nr; nr -= nw, off += nw)
+ if ((nw = write(wfd, buf + off, (size_t)nr)) < 0)
+ {
+ perror("write");
+ exit(EXIT_FAILURE);
+ }
+ if (nr < 0) {
+ fprintf(stderr,"%s: invalid length\n", filename);
+ rval = 1;
+ }
+}
+
+static void
+raw_args(char **argv)
+{
+ int fd;
+
+ fd = fileno(stdin);
+ filename = "stdin";
+ do {
+ if (*argv) {
+ if (!strcmp(*argv, "-"))
+ fd = fileno(stdin);
+ else if (fflag) {
+ struct stat st;
+ fd = open(*argv, O_RDONLY|O_NONBLOCK, 0);
+ if (fd < 0)
+ goto skip;
+
+ if (fstat(fd, &st) == -1) {
+ close(fd);
+ goto skip;
+ }
+ if (!S_ISREG(st.st_mode)) {
+ close(fd);
+ errno = EINVAL;
+ goto skipnomsg;
+ }
+ }
+ else if ((fd = open(*argv, O_RDONLY, 0)) < 0) {
+skip:
+ perror(*argv);
+skipnomsg:
+ rval = 1;
+ ++argv;
+ continue;
+ }
+ filename = *argv++;
+ }
+ raw_cat(fd);
+ if (fd != fileno(stdin))
+ close(fd);
+ } while (*argv);
+}
+
+int
+cat_main(int argc, char *argv[])
+{
+ int ch;
+ struct flock stdout_lock;
+
+ while ((ch = getopt(argc, argv, "beflnstv")) != -1)
+ switch (ch) {
+ case 'b':
+ bflag = nflag = 1; /* -b implies -n */
+ break;
+ case 'e':
+ eflag = vflag = 1; /* -e implies -v */
+ break;
+ case 'f':
+ fflag = 1;
+ break;
+ case 'l':
+ lflag = 1;
+ break;
+ case 'n':
+ nflag = 1;
+ break;
+ case 's':
+ sflag = 1;
+ break;
+ case 't':
+ tflag = vflag = 1; /* -t implies -v */
+ break;
+ case 'v':
+ vflag = 1;
+ break;
+ default:
+ case '?':
+ fprintf(stderr,
+ "usage: cat [-beflnstv] [-] [file ...]\n");
+ exit(EXIT_FAILURE);
+ }
+ argv += optind;
+
+ if (lflag) {
+ stdout_lock.l_len = 0;
+ stdout_lock.l_start = 0;
+ stdout_lock.l_type = F_WRLCK;
+ stdout_lock.l_whence = SEEK_SET;
+ if (fcntl(STDOUT_FILENO, F_SETLKW, &stdout_lock) == -1)
+ {
+ perror("fcntl");
+ exit(EXIT_FAILURE);
+ }
+ }
+
+ if (bflag || eflag || nflag || sflag || tflag || vflag)
+ cook_args(argv);
+ else
+ raw_args(argv);
+ if (fclose(stdout))
+ {
+ perror("fclose");
+ exit(EXIT_FAILURE);
+ }
+ exit(rval);
+}