1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
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 /*
33 * lam - laminate files
34 * Author: John Kunze, UCB
35 */
36
37 #include <sys/capsicum.h>
38
39 #include <capsicum_helpers.h>
40 #include <ctype.h>
41 #include <err.h>
42 #include <errno.h>
43 #include <stdio.h>
44 #include <stdlib.h>
45 #include <string.h>
46 #include <sysexits.h>
47 #include <unistd.h>
48
49 #define MAXOFILES 20
50 #define BIGBUFSIZ 5 * BUFSIZ
51
52 static struct openfile { /* open file structure */
53 FILE *fp; /* file pointer */
54 short eof; /* eof flag */
55 short pad; /* pad flag for missing columns */
56 char eol; /* end of line character */
57 const char *sepstring; /* string to print before each line */
58 const char *format; /* printf(3) style string spec. */
59 } input[MAXOFILES];
60
61 static int morefiles; /* set by getargs(), changed by gatherline() */
62 static int nofinalnl; /* normally append \n to each output line */
63 static char line[BIGBUFSIZ];
64 static char *linep;
65
66 static char *gatherline(struct openfile *);
67 static void getargs(char *[]);
68 static char *pad(struct openfile *);
69 static void usage(void);
70
71 int
main(int argc,char * argv[])72 main(int argc, char *argv[])
73 {
74 struct openfile *ip;
75
76 if (argc == 1)
77 usage();
78 if (caph_limit_stdio() == -1)
79 err(1, "unable to limit stdio");
80 getargs(argv);
81 if (!morefiles)
82 usage();
83
84 /*
85 * Cache NLS data, for strerror, for err(3), before entering capability
86 * mode.
87 */
88 caph_cache_catpages();
89 if (caph_enter() < 0)
90 err(1, "unable to enter capability mode");
91
92 for (;;) {
93 linep = line;
94 for (ip = input; ip->fp != NULL; ip++)
95 linep = gatherline(ip);
96 if (!morefiles)
97 exit(0);
98 fputs(line, stdout);
99 fputs(ip->sepstring, stdout);
100 if (!nofinalnl)
101 putchar('\n');
102 }
103 }
104
105 static void
getargs(char * av[])106 getargs(char *av[])
107 {
108 struct openfile *ip = input;
109 char *p, *c;
110 static char fmtbuf[BUFSIZ];
111 char *fmtp = fmtbuf;
112 int P, S, F, T;
113 cap_rights_t rights_ro;
114
115 cap_rights_init(&rights_ro, CAP_READ, CAP_FSTAT);
116 P = S = F = T = 0; /* capitalized options */
117 while ((p = *++av) != NULL) {
118 if (*p != '-' || !p[1]) {
119 if (++morefiles >= MAXOFILES)
120 errx(1, "too many input files");
121 if (*p == '-')
122 ip->fp = stdin;
123 else if ((ip->fp = fopen(p, "r")) == NULL) {
124 err(1, "%s", p);
125 }
126 if (caph_rights_limit(fileno(ip->fp), &rights_ro) < 0)
127 err(1, "unable to limit rights on: %s", p);
128 ip->pad = P;
129 if (!ip->sepstring)
130 ip->sepstring = (S ? (ip-1)->sepstring : "");
131 if (!ip->format)
132 ip->format = ((P || F) ? (ip-1)->format : "%s");
133 if (!ip->eol)
134 ip->eol = (T ? (ip-1)->eol : '\n');
135 ip++;
136 continue;
137 }
138 c = ++p;
139 switch (tolower((unsigned char)*c)) {
140 case 's':
141 if (*++p || (p = *++av))
142 ip->sepstring = p;
143 else
144 usage();
145 S = (*c == 'S' ? 1 : 0);
146 break;
147 case 't':
148 if (*++p || (p = *++av))
149 ip->eol = *p;
150 else
151 usage();
152 T = (*c == 'T' ? 1 : 0);
153 nofinalnl = 1;
154 break;
155 case 'p':
156 ip->pad = 1;
157 P = (*c == 'P' ? 1 : 0);
158 /* FALLTHROUGH */
159 case 'f':
160 F = (*c == 'F' ? 1 : 0);
161 if (*++p || (p = *++av)) {
162 fmtp += strlen(fmtp) + 1;
163 if (fmtp >= fmtbuf + sizeof(fmtbuf))
164 errx(1, "no more format space");
165 /* restrict format string to only valid width formatters */
166 if (strspn(p, "-.0123456789") != strlen(p))
167 errx(1, "invalid format string `%s'", p);
168 if (snprintf(fmtp, fmtbuf + sizeof(fmtbuf) - fmtp, "%%%ss", p)
169 >= fmtbuf + sizeof(fmtbuf) - fmtp)
170 errx(1, "no more format space");
171 ip->format = fmtp;
172 }
173 else
174 usage();
175 break;
176 default:
177 usage();
178 }
179 }
180 ip->fp = NULL;
181 if (!ip->sepstring)
182 ip->sepstring = "";
183 }
184
185 static char *
pad(struct openfile * ip)186 pad(struct openfile *ip)
187 {
188 char *lp = linep;
189
190 strlcpy(lp, ip->sepstring, line + sizeof(line) - lp);
191 lp += strlen(lp);
192 if (ip->pad) {
193 snprintf(lp, line + sizeof(line) - lp, ip->format, "");
194 lp += strlen(lp);
195 }
196 return (lp);
197 }
198
199 static char *
gatherline(struct openfile * ip)200 gatherline(struct openfile *ip)
201 {
202 char s[BUFSIZ];
203 int c;
204 char *p;
205 char *lp = linep;
206 char *end = s + sizeof(s) - 1;
207
208 if (ip->eof)
209 return (pad(ip));
210 for (p = s; (c = fgetc(ip->fp)) != EOF && p < end; p++)
211 if ((*p = c) == ip->eol)
212 break;
213 *p = '\0';
214 if (c == EOF) {
215 ip->eof = 1;
216 if (ferror(ip->fp)) {
217 err(EX_IOERR, NULL);
218 }
219 if (ip->fp == stdin)
220 fclose(stdin);
221 morefiles--;
222 return (pad(ip));
223 }
224 strlcpy(lp, ip->sepstring, line + sizeof(line) - lp);
225 lp += strlen(lp);
226 snprintf(lp, line + sizeof(line) - lp, ip->format, s);
227 lp += strlen(lp);
228 return (lp);
229 }
230
231 static void
usage(void)232 usage(void)
233 {
234 fprintf(stderr, "%s\n%s\n",
235 "usage: lam [ -f min.max ] [ -s sepstring ] [ -t c ] file ...",
236 " lam [ -p min.max ] [ -s sepstring ] [ -t c ] file ...");
237 exit(1);
238 }
239