1/*	$NetBSD: lam.c,v 1.7 2009/04/12 13:01:55 lukem Exp $	*/
2
3/*-
4 * Copyright (c) 1993
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 *    may be used to endorse or promote products derived from this software
17 *    without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32#include <sys/cdefs.h>
33#ifndef lint
34__COPYRIGHT("@(#) Copyright (c) 1993\
35 The Regents of the University of California.  All rights reserved.");
36#endif /* not lint */
37
38#ifndef lint
39#if 0
40static char sccsid[] = "@(#)lam.c	8.1 (Berkeley) 6/6/93";
41#endif
42__RCSID("$NetBSD: lam.c,v 1.7 2009/04/12 13:01:55 lukem Exp $");
43#endif /* not lint */
44
45/*
46 *	lam - laminate files
47 *	Author:  John Kunze, UCB
48 */
49
50#include <ctype.h>
51#include <err.h>
52#include <stdio.h>
53#include <stdlib.h>
54#include <string.h>
55
56#define	MAXOFILES	20
57#define	BIGBUFSIZ	5 * BUFSIZ
58
59struct	openfile {		/* open file structure */
60	FILE	*fp;		/* file pointer */
61	short	eof;		/* eof flag */
62	short	pad;		/* pad flag for missing columns */
63	char	eol;		/* end of line character */
64	const char *sepstring;	/* string to print before each line */
65	const char *format;	/* printf(3) style string spec. */
66}	input[MAXOFILES];
67
68static int	morefiles;		/* set by getargs(), changed by gatherline() */
69static int	nofinalnl;		/* normally append \n to each output line */
70static char	line[BIGBUFSIZ];
71static char	*linep;
72
73__dead static void	 error(const char *, const char *);
74static char	*gatherline(struct openfile *);
75static void	 getargs(char *[]);
76static char	*pad(struct openfile *);
77
78int
79main(int argc, char *argv[])
80{
81	struct	openfile *ip;
82
83	getargs(argv);
84	if (!morefiles)
85		error("lam - laminate files", "");
86	for (;;) {
87		linep = line;
88		for (ip = input; ip->fp != NULL; ip++)
89			linep = gatherline(ip);
90		if (!morefiles)
91			exit(0);
92		fputs(line, stdout);
93		fputs(ip->sepstring, stdout);
94		if (!nofinalnl)
95			putchar('\n');
96	}
97}
98
99static void
100getargs(char *av[])
101{
102	struct openfile *ip = input;
103	char *p, *c;
104	static char fmtbuf[BUFSIZ];
105	char *fmtp = fmtbuf;
106	int P, S, F, T;
107
108	P = S = F = T = 0;		/* capitalized options */
109	while ((p = *++av) != NULL) {
110		if (*p != '-' || !p[1]) {
111			if (++morefiles >= MAXOFILES)
112				errx(1, "too many input files");
113			if (*p == '-')
114				ip->fp = stdin;
115			else if ((ip->fp = fopen(p, "r")) == NULL)
116				errx(1, "open %s", p);
117			ip->pad = P;
118			if (!ip->sepstring)
119				ip->sepstring = (S ? (ip-1)->sepstring : "");
120			if (!ip->format)
121				ip->format = ((P || F) ? (ip-1)->format : "%s");
122			if (!ip->eol)
123				ip->eol = (T ? (ip-1)->eol : '\n');
124			ip++;
125			continue;
126		}
127		c = ++p;
128		switch (tolower((unsigned char) *c)) {
129		case 's':
130			if (*++p || (p = *++av))
131				ip->sepstring = p;
132			else
133				error("Need string after -%s", c);
134			S = (*c == 'S' ? 1 : 0);
135			break;
136		case 't':
137			if (*++p || (p = *++av))
138				ip->eol = *p;
139			else
140				error("Need character after -%s", c);
141			T = (*c == 'T' ? 1 : 0);
142			nofinalnl = 1;
143			break;
144		case 'p':
145			ip->pad = 1;
146			P = (*c == 'P' ? 1 : 0);
147			/* FALLTHROUGH */
148		case 'f':
149			F = (*c == 'F' ? 1 : 0);
150			if (*++p || (p = *++av)) {
151				fmtp += strlen(fmtp) + 1;
152				if (fmtp >= fmtbuf + sizeof(fmtbuf))
153					errx(1, "no more format space");
154				/* restrict format string to only valid width formatters */
155				if (strspn(p, "-.0123456789") != strlen(p))
156					errx(1, "invalid format string `%s'", p);
157				if (snprintf(fmtp, fmtbuf + sizeof(fmtbuf) - fmtp, "%%%ss", p)
158					>= fmtbuf + sizeof(fmtbuf) - fmtp)
159						errx(1, "no more format space");
160				sprintf(fmtp, "%%%ss", p);
161				ip->format = fmtp;
162			}
163			else
164				error("Need string after -%s", c);
165			break;
166		default:
167			error("What do you mean by -%s?", c);
168			break;
169		}
170	}
171	ip->fp = NULL;
172	if (!ip->sepstring)
173		ip->sepstring = "";
174}
175
176static char *
177pad(struct openfile *ip)
178{
179	char *lp = linep;
180
181	strlcpy(lp, ip->sepstring, line + sizeof(line) - lp);
182	lp += strlen(lp);
183	if (ip->pad) {
184		snprintf(lp, line + sizeof(line) - lp, ip->format, "");
185		lp += strlen(lp);
186	}
187	return (lp);
188}
189
190static char *
191gatherline(struct openfile *ip)
192{
193	char s[BUFSIZ];
194	int c;
195	char *p;
196	char *lp = linep;
197	char *end = s + sizeof(s) - 1;
198
199	if (ip->eof)
200		return (pad(ip));
201	for (p = s; (c = fgetc(ip->fp)) != EOF && p < end; p++)
202		if ((*p = c) == ip->eol)
203			break;
204	*p = '\0';
205	if (c == EOF) {
206		ip->eof = 1;
207		if (ip->fp == stdin)
208			fclose(stdin);
209		morefiles--;
210		return (pad(ip));
211	}
212	strlcpy(lp, ip->sepstring, line + sizeof(line) - lp);
213	lp += strlen(lp);
214	snprintf(lp, line + sizeof(line) - lp, ip->format, s);
215	lp += strlen(lp);
216	return (lp);
217}
218
219static void
220error(const char *msg, const char *s)
221{
222	warnx(msg, s);
223	fprintf(stderr,
224"\nUsage:  lam [ -[fp] min.max ] [ -s sepstring ] [ -t c ] file ...\n");
225	if (strncmp("lam - ", msg, 6) == 0)
226		fprintf(stderr, "Options:\n\t%s\t%s\t%s\t%s\t%s",
227		    "-f min.max	field widths for file fragments\n",
228		    "-p min.max	like -f, but pad missing fragments\n",
229		    "-s sepstring	fragment separator\n",
230"-t c		input line terminator is c, no \\n after output lines\n",
231		    "Capitalized options affect more than one file.\n");
232	exit(1);
233}
234