xref: /netbsd-src/usr.bin/lam/lam.c (revision cb377560e8831e2f9f518531b7dd806a350c6800)
1 /*	$NetBSD: lam.c,v 1.8 2011/09/04 20:28:09 joerg 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
40 static char sccsid[] = "@(#)lam.c	8.1 (Berkeley) 6/6/93";
41 #endif
42 __RCSID("$NetBSD: lam.c,v 1.8 2011/09/04 20:28:09 joerg 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 
59 struct	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 
68 static int	morefiles;		/* set by getargs(), changed by gatherline() */
69 static int	nofinalnl;		/* normally append \n to each output line */
70 static char	line[BIGBUFSIZ];
71 static char	*linep;
72 
73 __dead static void	 error(const char *, const char *);
74 static char	*gatherline(struct openfile *);
75 static void	 getargs(char *[]);
76 static char	*pad(struct openfile *);
77 
78 int
main(int argc,char * argv[])79 main(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 
99 static void
getargs(char * av[])100 getargs(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 
176 static char *
pad(struct openfile * ip)177 pad(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 
190 static char *
gatherline(struct openfile * ip)191 gatherline(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 
219 static void
error(const char * msg,const char * s)220 error(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