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/* $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);
}
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