paste.c revision 97223 
1/*
2 * Copyright (c) 1989, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * Adam S. Moskowitz of Menlo Consulting.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 *    must display the following acknowledgement:
18 *	This product includes software developed by the University of
19 *	California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 *    may be used to endorse or promote products derived from this software
22 *    without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 */
36
37#ifndef lint
38static const char copyright[] =
39"@(#) Copyright (c) 1989, 1993\n\
40	The Regents of the University of California.  All rights reserved.\n";
41#endif /* not lint */
42
43#if 0
44#ifndef lint
45static char sccsid[] = "@(#)paste.c	8.1 (Berkeley) 6/6/93";
46#endif /* not lint */
47#endif
48
49#include <sys/cdefs.h>
50__FBSDID("$FreeBSD: head/usr.bin/paste/paste.c 97223 2002-05-24 06:17:29Z tjr $");
51
52#include <sys/types.h>
53
54#include <err.h>
55#include <errno.h>
56#include <limits.h>
57#include <stdio.h>
58#include <stdlib.h>
59#include <string.h>
60#include <unistd.h>
61
62char *delim;
63int delimcnt;
64
65int parallel(char **);
66int sequential(char **);
67int tr(char *);
68static void usage(void);
69
70char tab[] = "\t";
71
72int
73main(int argc, char *argv[])
74{
75	int ch, rval, seq;
76
77	seq = 0;
78	while ((ch = getopt(argc, argv, "d:s")) != -1)
79		switch(ch) {
80		case 'd':
81			delimcnt = tr(delim = optarg);
82			break;
83		case 's':
84			seq = 1;
85			break;
86		case '?':
87		default:
88			usage();
89		}
90	argc -= optind;
91	argv += optind;
92
93	if (*argv == NULL)
94		usage();
95	if (!delim) {
96		delimcnt = 1;
97		delim = tab;
98	}
99
100	if (seq)
101		rval = sequential(argv);
102	else
103		rval = parallel(argv);
104	exit(rval);
105}
106
107typedef struct _list {
108	struct _list *next;
109	FILE *fp;
110	int cnt;
111	char *name;
112} LIST;
113
114int
115parallel(char **argv)
116{
117	LIST *lp;
118	int cnt;
119	char ch, *p;
120	LIST *head, *tmp;
121	int opencnt, output;
122	char buf[_POSIX2_LINE_MAX + 1];
123
124	for (cnt = 0, head = NULL; (p = *argv); ++argv, ++cnt) {
125		if ((lp = malloc(sizeof(LIST))) == NULL)
126			err(1, NULL);
127		if (p[0] == '-' && !p[1])
128			lp->fp = stdin;
129		else if (!(lp->fp = fopen(p, "r")))
130			err(1, "%s", p);
131		lp->next = NULL;
132		lp->cnt = cnt;
133		lp->name = p;
134		if (!head)
135			head = tmp = lp;
136		else {
137			tmp->next = lp;
138			tmp = lp;
139		}
140	}
141
142	for (opencnt = cnt; opencnt;) {
143		for (output = 0, lp = head; lp; lp = lp->next) {
144			if (!lp->fp) {
145				if (output && lp->cnt &&
146				    (ch = delim[(lp->cnt - 1) % delimcnt]))
147					putchar(ch);
148				continue;
149			}
150			if (!fgets(buf, sizeof(buf), lp->fp)) {
151				if (!--opencnt)
152					break;
153				lp->fp = NULL;
154				if (output && lp->cnt &&
155				    (ch = delim[(lp->cnt - 1) % delimcnt]))
156					putchar(ch);
157				continue;
158			}
159			if (!(p = index(buf, '\n')))
160				errx(1, "%s: input line too long", lp->name);
161			*p = '\0';
162			/*
163			 * make sure that we don't print any delimiters
164			 * unless there's a non-empty file.
165			 */
166			if (!output) {
167				output = 1;
168				for (cnt = 0; cnt < lp->cnt; ++cnt)
169					if ((ch = delim[cnt % delimcnt]))
170						putchar(ch);
171			} else if ((ch = delim[(lp->cnt - 1) % delimcnt]))
172				putchar(ch);
173			(void)printf("%s", buf);
174		}
175		if (output)
176			putchar('\n');
177	}
178
179	return (0);
180}
181
182int
183sequential(char **argv)
184{
185	FILE *fp;
186	int cnt, failed;
187	char ch, *p, *dp;
188	char buf[_POSIX2_LINE_MAX + 1];
189
190	failed = 0;
191	for (; (p = *argv); ++argv) {
192		if (p[0] == '-' && !p[1])
193			fp = stdin;
194		else if (!(fp = fopen(p, "r"))) {
195			warn("%s", p);
196			failed = 1;
197			continue;
198		}
199		if (fgets(buf, sizeof(buf), fp)) {
200			for (cnt = 0, dp = delim;;) {
201				if (!(p = index(buf, '\n')))
202					errx(1, "%s: input line too long", *argv);
203				*p = '\0';
204				(void)printf("%s", buf);
205				if (!fgets(buf, sizeof(buf), fp))
206					break;
207				if ((ch = *dp++))
208					putchar(ch);
209				if (++cnt == delimcnt) {
210					dp = delim;
211					cnt = 0;
212				}
213			}
214			putchar('\n');
215		}
216		if (fp != stdin)
217			(void)fclose(fp);
218	}
219
220	return (failed != 0);
221}
222
223int
224tr(char *arg)
225{
226	int cnt;
227	char ch, *p;
228
229	for (p = arg, cnt = 0; (ch = *p++); ++arg, ++cnt)
230		if (ch == '\\')
231			switch(ch = *p++) {
232			case 'n':
233				*arg = '\n';
234				break;
235			case 't':
236				*arg = '\t';
237				break;
238			case '0':
239				*arg = '\0';
240				break;
241			default:
242				*arg = ch;
243				break;
244		} else
245			*arg = ch;
246
247	if (!cnt)
248		errx(1, "no delimiters specified");
249	return(cnt);
250}
251
252static void
253usage(void)
254{
255	(void)fprintf(stderr, "usage: paste [-s] [-d delimiters] file ...\n");
256	exit(1);
257}
258