lam.c revision 99221 
1/*-
2 * Copyright (c) 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *	This product includes software developed by the University of
16 *	California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#ifndef lint
35static const char copyright[] =
36"@(#) Copyright (c) 1993\n\
37	The Regents of the University of California.  All rights reserved.\n";
38#endif /* not lint */
39
40#ifndef lint
41#if 0
42static char sccsid[] = "@(#)lam.c	8.1 (Berkeley) 6/6/93";
43#endif
44#endif /* not lint */
45#include <sys/cdefs.h>
46__FBSDID("$FreeBSD: head/usr.bin/lam/lam.c 99221 2002-07-01 18:03:30Z jmallett $");
47
48/*
49 *	lam - laminate files
50 *	Author:  John Kunze, UCB
51 */
52
53#include <ctype.h>
54#include <err.h>
55#include <stdio.h>
56#include <stdlib.h>
57#include <string.h>
58
59#define	MAXOFILES	20
60#define	BIGBUFSIZ	5 * BUFSIZ
61
62struct	openfile {		/* open file structure */
63	FILE	*fp;		/* file pointer */
64	short	eof;		/* eof flag */
65	short	pad;		/* pad flag for missing columns */
66	char	eol;		/* end of line character */
67	const char *sepstring;	/* string to print before each line */
68	const char *format;	/* printf(3) style string spec. */
69}	input[MAXOFILES];
70
71int	morefiles;		/* set by getargs(), changed by gatherline() */
72int	nofinalnl;		/* normally append \n to each output line */
73char	line[BIGBUFSIZ];
74char	*linep;
75
76static char    *gatherline(struct openfile *);
77static void	getargs(char *[]);
78static char    *pad(struct openfile *);
79static void	usage(void);
80
81int
82main(int argc, char *argv[])
83{
84	struct	openfile *ip;
85
86	if (argc == 1)
87		usage();
88	getargs(argv);
89	if (!morefiles)
90		usage();
91	for (;;) {
92		linep = line;
93		for (ip = input; ip->fp != NULL; ip++)
94			linep = gatherline(ip);
95		if (!morefiles)
96			exit(0);
97		fputs(line, stdout);
98		fputs(ip->sepstring, stdout);
99		if (!nofinalnl)
100			putchar('\n');
101	}
102}
103
104static void
105getargs(char *av[])
106{
107	struct	openfile *ip = input;
108	char *p, *c;
109	static char fmtbuf[BUFSIZ];
110	char *fmtp = fmtbuf;
111	int P, S, F, T;
112
113	P = S = F = T = 0;		/* capitalized options */
114	while ((p = *++av) != NULL) {
115		if (*p != '-' || !p[1]) {
116			if (++morefiles >= MAXOFILES)
117				errx(1, "too many input files");
118			if (*p == '-')
119				ip->fp = stdin;
120			else if ((ip->fp = fopen(p, "r")) == NULL) {
121				err(1, "%s", p);
122			}
123			ip->pad = P;
124			if (!ip->sepstring)
125				ip->sepstring = (S ? (ip-1)->sepstring : "");
126			if (!ip->format)
127				ip->format = ((P || F) ? (ip-1)->format : "%s");
128			if (!ip->eol)
129				ip->eol = (T ? (ip-1)->eol : '\n');
130			ip++;
131			continue;
132		}
133		c = ++p;
134		switch (tolower(*c)) {
135		case 's':
136			if (*++p || (p = *++av))
137				ip->sepstring = p;
138			else
139				errx(1, "need string after -%s", c);
140			S = (*c == 'S' ? 1 : 0);
141			break;
142		case 't':
143			if (*++p || (p = *++av))
144				ip->eol = *p;
145			else
146				errx(1, "need character after -%s", c);
147			T = (*c == 'T' ? 1 : 0);
148			nofinalnl = 1;
149			break;
150		case 'p':
151			ip->pad = 1;
152			P = (*c == 'P' ? 1 : 0);
153			/* FALLTHROUGH */
154		case 'f':
155			F = (*c == 'F' ? 1 : 0);
156			if (*++p || (p = *++av)) {
157				fmtp += strlen(fmtp) + 1;
158				if (fmtp >= fmtbuf + sizeof(fmtbuf))
159					errx(1, "no more format space");
160				/* restrict format string to only valid width formatters */
161				if (strspn(p, "-.0123456789") != strlen(p))
162					errx(1, "invalid format string `%s'", p);
163				if (snprintf(fmtp, fmtbuf + sizeof(fmtbuf) - fmtp, "%%%ss", p)
164				    >= fmtbuf + sizeof(fmtbuf) - fmtp)
165					errx(1, "no more format space");
166				ip->format = fmtp;
167			}
168			else
169				errx(1, "need string after -%s", c);
170			break;
171		default:
172			errx(1, "what do you mean by -%s?", c);
173			break;
174		}
175	}
176	ip->fp = NULL;
177	if (!ip->sepstring)
178		ip->sepstring = "";
179}
180
181static char *
182pad(struct openfile *ip)
183{
184	char *lp = linep;
185
186	strlcpy(lp, ip->sepstring, line + sizeof(line) - lp);
187	lp += strlen(lp);
188	if (ip->pad) {
189		snprintf(lp, line + sizeof(line) - lp, ip->format, "");
190		lp += strlen(lp);
191	}
192	return (lp);
193}
194
195static char *
196gatherline(struct openfile *ip)
197{
198	char s[BUFSIZ];
199	int c;
200	char *p;
201	char *lp = linep;
202	char *end = s + sizeof(s) - 1;
203
204	if (ip->eof)
205		return (pad(ip));
206	for (p = s; (c = fgetc(ip->fp)) != EOF && p < end; p++)
207		if ((*p = c) == ip->eol)
208			break;
209	*p = '\0';
210	if (c == EOF) {
211		ip->eof = 1;
212		if (ip->fp == stdin)
213			fclose(stdin);
214		morefiles--;
215		return (pad(ip));
216	}
217	strlcpy(lp, ip->sepstring, line + sizeof(line) - lp);
218	lp += strlen(lp);
219	snprintf(lp, line + sizeof(line) - lp, ip->format, s);
220	lp += strlen(lp);
221	return (lp);
222}
223
224static void
225usage()
226{
227	fprintf(stderr, "%s\n%s\n",
228"usage: lam [ -f min.max ] [ -s sepstring ] [ -t c ] file ...",
229"       lam [ -p min.max ] [ -s sepstring ] [ -t c ] file ...");
230	exit(1);
231}
232