uudecode.c revision 28564 
1/*-
2 * Copyright (c) 1983, 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) 1983, 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[] = "@(#)uudecode.c	8.2 (Berkeley) 4/2/94";
43#endif
44static const char rcsid[] =
45	"$Id$";
46#endif /* not lint */
47
48/*
49 * uudecode [file ...]
50 *
51 * create the specified file, decoding as you go.
52 * used with uuencode.
53 */
54#include <sys/param.h>
55#include <sys/stat.h>
56
57#include <err.h>
58#include <fnmatch.h>
59#include <pwd.h>
60#include <stdio.h>
61#include <stdlib.h>
62#include <string.h>
63#include <unistd.h>
64
65char *filename;
66int cflag, pflag;
67
68static void usage __P((void));
69int	decode __P((void));
70int	decode2 __P((int));
71
72int
73main(argc, argv)
74	int argc;
75	char *argv[];
76{
77	int rval, ch;
78
79	while ((ch = getopt(argc, argv, "cp")) != -1) {
80		switch(ch) {
81		case 'c':
82			cflag = 1; /* multiple uudecode'd files */
83			break;
84		case 'p':
85			pflag = 1; /* print output to stdout */
86			break;
87		default:
88			usage();
89		}
90	}
91        argc -= optind;
92        argv += optind;
93
94
95	if (*argv) {
96		rval = 0;
97		do {
98			if (!freopen(filename = *argv, "r", stdin)) {
99				warn("%s", *argv);
100				rval = 1;
101				continue;
102			}
103			rval |= decode();
104		} while (*++argv);
105	} else {
106		filename = "stdin";
107		rval = decode();
108	}
109	exit(rval);
110}
111
112int
113decode ()
114{
115	int flag;
116
117	/* decode only one file per input stream */
118	if (!cflag)
119		return(decode2(0));
120
121	/* multiple uudecode'd files */
122	for (flag = 0; ; flag++)
123		if (decode2(flag))
124			return(1);
125		else if (feof(stdin))
126			break;
127
128	return(0);
129}
130
131int
132decode2(flag)
133	int flag;
134{
135	struct passwd *pw;
136	register int n;
137	register char ch, *p;
138	int mode, n1;
139	char buf[MAXPATHLEN];
140	char buffn[MAXPATHLEN]; /* file name buffer */
141
142
143	/* search for header line */
144	do {
145		if (!fgets(buf, sizeof(buf), stdin)) {
146			if (flag) /* no error */
147				return(0);
148
149			warnx("%s: no \"begin\" line", filename);
150			return(1);
151		}
152	} while (strncmp(buf, "begin ", 6) ||
153		 fnmatch("begin [0-7]* *", buf, 0));
154
155	(void)sscanf(buf, "begin %o %s", &mode, buf);
156
157	/* handle ~user/file format */
158	if (buf[0] == '~') {
159		if (!(p = index(buf, '/'))) {
160			warnx("%s: illegal ~user", filename);
161			return(1);
162		}
163		*p++ = NULL;
164		if (!(pw = getpwnam(buf + 1))) {
165			warnx("%s: no user %s", filename, buf);
166			return(1);
167		}
168		n = strlen(pw->pw_dir);
169		n1 = strlen(p);
170		if (n + n1 + 2 > MAXPATHLEN) {
171			warnx("%s: path too long", filename);
172			return(1);
173		}
174		bcopy(p, buf + n + 1, n1 + 1);
175		bcopy(pw->pw_dir, buf, n);
176		buf[n] = '/';
177	}
178
179	/* create output file, set mode */
180	if (pflag)
181		; /* print to stdout */
182
183	else if (!freopen(buf, "w", stdout) ||
184	    fchmod(fileno(stdout), mode&0666)) {
185		warn("%s: %s", buf, filename);
186		return(1);
187	}
188	strcpy(buffn, buf); /* store file name from header line */
189
190	/* for each input line */
191	for (;;) {
192		if (!fgets(p = buf, sizeof(buf), stdin)) {
193			warnx("%s: short file", filename);
194			return(1);
195		}
196#define	DEC(c)	(((c) - ' ') & 077)		/* single character decode */
197#define IS_DEC(c) ( (((c) - ' ') >= 0) &&  (((c) - ' ') <= 077 + 1) )
198/* #define IS_DEC(c) (1) */
199
200#define OUT_OF_RANGE \
201{	\
202    warnx( \
203"\n\tinput file: %s\n\tencoded file: %s\n\tcharacter out of range: [%d-%d]", \
204 	filename, buffn, 1 + ' ', 077 + ' ' + 1); \
205        return(1); \
206}
207
208
209		/*
210		 * `n' is used to avoid writing out all the characters
211		 * at the end of the file.
212		 */
213		if ((n = DEC(*p)) <= 0)
214			break;
215		for (++p; n > 0; p += 4, n -= 3)
216			if (n >= 3) {
217				if (!(IS_DEC(*p) && IS_DEC(*(p + 1)) &&
218				     IS_DEC(*(p + 2)) && IS_DEC(*(p + 3))))
219                                	OUT_OF_RANGE
220
221				ch = DEC(p[0]) << 2 | DEC(p[1]) >> 4;
222				putchar(ch);
223				ch = DEC(p[1]) << 4 | DEC(p[2]) >> 2;
224				putchar(ch);
225				ch = DEC(p[2]) << 6 | DEC(p[3]);
226				putchar(ch);
227
228			}
229			else {
230				if (n >= 1) {
231					if (!(IS_DEC(*p) && IS_DEC(*(p + 1))))
232	                                	OUT_OF_RANGE
233					ch = DEC(p[0]) << 2 | DEC(p[1]) >> 4;
234					putchar(ch);
235				}
236				if (n >= 2) {
237					if (!(IS_DEC(*(p + 1)) &&
238						IS_DEC(*(p + 2))))
239		                                OUT_OF_RANGE
240
241					ch = DEC(p[1]) << 4 | DEC(p[2]) >> 2;
242					putchar(ch);
243				}
244				if (n >= 3) {
245					if (!(IS_DEC(*(p + 2)) &&
246						IS_DEC(*(p + 3))))
247		                                OUT_OF_RANGE
248					ch = DEC(p[2]) << 6 | DEC(p[3]);
249					putchar(ch);
250				}
251			}
252	}
253	if (fgets(buf, sizeof(buf), stdin) == NULL ||
254	    (strcmp(buf, "end") && strcmp(buf, "end\n") &&
255	     strcmp(buf, "end\r\n"))) {
256		warnx("%s: no \"end\" line", filename);
257		return(1);
258	}
259	return(0);
260}
261
262static void
263usage()
264{
265	(void)fprintf(stderr, "usage: uudecode [-cp] [file ...]\n");
266	exit(1);
267}
268