* Copyright (c) 1989, 1993

/* $NetBSD: paste.c,v 1.16 2011/09/06 18:24:43 joerg 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
* Adam S. Moskowitz of Menlo Consulting.
*
* 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/cdefs.h>
#ifndef lint
__COPYRIGHT("@(#) Copyright (c) 1989, 1993\
The Regents of the University of California. All rights reserved.");
#endif /* not lint */

#ifndef lint
/*static char sccsid[] = "from: @(#)paste.c 8.1 (Berkeley) 6/6/93";*/
__RCSID("$NetBSD: paste.c,v 1.16 2011/09/06 18:24:43 joerg Exp $");
#endif /* not lint */

#include <sys/types.h>
#include <err.h>
#include <errno.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

static void parallel(int, char **);
static void sequential(char **);
static int tr(char *);
__dead static void usage(void);

static char dflt_delim[] = "\t";
static char *delim = dflt_delim;
static int delimcnt = 1;

int
main(int argc, char **argv)
{
int ch, seq;

seq = 0;
while ((ch = getopt(argc, argv, "d:s")) != -1) {
switch (ch) {
case 'd':
delim = strdup(optarg);
delimcnt = tr(delim);
break;
case 's':
seq = 1;
break;
case '?':
default:
usage();
}
}
argc -= optind;
argv += optind;

if (seq)
sequential(argv);
else
parallel(argc, argv);
exit(0);
}

static void
parallel(int argc, char **argv)
{
char ch, *dp, *line;
FILE **fpp, *fp;
size_t line_len;
int cnt, output;

fpp = calloc(argc, sizeof *fpp);
if (fpp == NULL)
err(1, "calloc");

for (cnt = 0; cnt < argc; cnt++) {
if (strcmp(argv[cnt], "-") == 0)
fpp[cnt] = stdin;
else if (!(fpp[cnt] = fopen(argv[cnt], "r")))
err(1, "%s", argv[cnt]);
}

for (;;) {
/* Start with the NUL at the end of 'delim' ... */
dp = delim + delimcnt;
output = 0;
for (cnt = 0; cnt < argc; cnt++) {
fp = fpp[cnt];
if (fp == NULL)
continue;
line = fgetln(fp, &line_len);
if (line == NULL) {
/* Assume EOF */
if (fp != stdin)
fclose(fp);
fpp[cnt] = NULL;
continue;
}
/* Output enough separators to catch up */
do {
ch = *dp++;
if (ch)
putchar(ch);
if (dp >= delim + delimcnt)
dp = delim;
} while (++output <= cnt);
/* Remove any trailing newline - check for last line */
if (line[line_len - 1] == '\n')
line_len--;
printf("%.*s", (int)line_len, line);
}

if (!output)
break;

/* Add separators to end of line */
while (++output <= cnt) {
ch = *dp++;
if (ch)
putchar(ch);
if (dp >= delim + delimcnt)
dp = delim;
}
putchar('\n');
}

free(fpp);
}

static void
sequential(char **argv)
{
FILE *fp;
int cnt;
char ch, *p, *dp;
char buf[_POSIX2_LINE_MAX + 1];

for (; (p = *argv) != NULL; ++argv) {
if (p[0] == '-' && !p[1])
fp = stdin;
else if (!(fp = fopen(p, "r"))) {
warn("%s", p);
continue;
}
if (fgets(buf, sizeof(buf), fp)) {
for (cnt = 0, dp = delim;;) {
if (!(p = strchr(buf, '\n')))
err(1, "%s: input line too long.",
*argv);
*p = '\0';
(void)printf("%s", buf);
if (!fgets(buf, sizeof(buf), fp))
break;
if ((ch = *dp++) != 0)
putchar(ch);
if (++cnt == delimcnt) {
dp = delim;
cnt = 0;
}
}
putchar('\n');
}
if (fp != stdin)
(void)fclose(fp);
}
}

static int
tr(char *arg)
{
int cnt;
char ch, *p;

for (p = arg, cnt = 0; (ch = *p++); ++arg, ++cnt)
if (ch == '\\')
switch(ch = *p++) {
case 'n':
*arg = '\n';
break;
case 't':
*arg = '\t';
break;
case '0':
*arg = '\0';
break;
default:
*arg = ch;
break;
} else
*arg = ch;

if (!cnt)
errx(1, "no delimiters specified.");
*arg = '\0';
return(cnt);
}

static void
usage(void)
{
(void)fprintf(stderr, "paste: [-s] [-d delimiters] file ...\n");
exit(1);
}