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15637ed4 RG |
1 | /* |
2 | * Copyright (c) 1983 Regents of the University of California. | |
3 | * 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 | |
35 | static char sccsid[] = "@(#)uudecode.c 5.10 (Berkeley) 6/1/90"; | |
36 | #endif /* not lint */ | |
37 | ||
38 | /* | |
39 | * uudecode [file ...] | |
40 | * | |
41 | * create the specified file, decoding as you go. | |
42 | * used with uuencode. | |
43 | */ | |
44 | #include <sys/param.h> | |
45 | #include <sys/stat.h> | |
46 | #include <pwd.h> | |
47 | #include <stdio.h> | |
48 | #include <string.h> | |
49 | ||
50 | char *filename; | |
51 | ||
52 | /* ARGSUSED */ | |
53 | main(argc, argv) | |
54 | int argc; | |
55 | char **argv; | |
56 | { | |
57 | extern int errno; | |
58 | int rval; | |
59 | ||
60 | if (*++argv) { | |
61 | rval = 0; | |
62 | do { | |
63 | if (!freopen(filename = *argv, "r", stdin)) { | |
64 | (void)fprintf(stderr, "uudecode: %s: %s\n", | |
65 | *argv, strerror(errno)); | |
66 | rval = 1; | |
67 | continue; | |
68 | } | |
69 | rval |= decode(); | |
70 | } while (*++argv); | |
71 | } else { | |
72 | filename = "stdin"; | |
73 | rval = decode(); | |
74 | } | |
75 | exit(rval); | |
76 | } | |
77 | ||
78 | decode() | |
79 | { | |
80 | extern int errno; | |
81 | struct passwd *pw; | |
82 | register int n; | |
83 | register char ch, *p; | |
84 | int mode, n1; | |
85 | char buf[MAXPATHLEN]; | |
86 | ||
87 | /* search for header line */ | |
88 | do { | |
89 | if (!fgets(buf, sizeof(buf), stdin)) { | |
90 | (void)fprintf(stderr, | |
91 | "uudecode: %s: no \"begin\" line\n", filename); | |
92 | return(1); | |
93 | } | |
94 | } while (strncmp(buf, "begin ", 6)); | |
95 | (void)sscanf(buf, "begin %o %s", &mode, buf); | |
96 | ||
97 | /* handle ~user/file format */ | |
98 | if (buf[0] == '~') { | |
99 | if (!(p = index(buf, '/'))) { | |
100 | (void)fprintf(stderr, "uudecode: %s: illegal ~user.\n", | |
101 | filename); | |
102 | return(1); | |
103 | } | |
104 | *p++ = NULL; | |
105 | if (!(pw = getpwnam(buf + 1))) { | |
106 | (void)fprintf(stderr, "uudecode: %s: no user %s.\n", | |
107 | filename, buf); | |
108 | return(1); | |
109 | } | |
110 | n = strlen(pw->pw_dir); | |
111 | n1 = strlen(p); | |
112 | if (n + n1 + 2 > MAXPATHLEN) { | |
113 | (void)fprintf(stderr, "uudecode: %s: path too long.\n", | |
114 | filename); | |
115 | return(1); | |
116 | } | |
117 | bcopy(p, buf + n + 1, n1 + 1); | |
118 | bcopy(pw->pw_dir, buf, n); | |
119 | buf[n] = '/'; | |
120 | } | |
121 | ||
122 | /* create output file, set mode */ | |
123 | if (!freopen(buf, "w", stdout) || | |
124 | fchmod(fileno(stdout), mode&0666)) { | |
125 | (void)fprintf(stderr, "uudecode: %s: %s: %s\n", buf, | |
126 | filename, strerror(errno)); | |
127 | return(1); | |
128 | } | |
129 | ||
130 | /* for each input line */ | |
131 | for (;;) { | |
132 | if (!fgets(p = buf, sizeof(buf), stdin)) { | |
133 | (void)fprintf(stderr, "uudecode: %s: short file.\n", | |
134 | filename); | |
135 | return(1); | |
136 | } | |
137 | #define DEC(c) (((c) - ' ') & 077) /* single character decode */ | |
138 | /* | |
139 | * `n' is used to avoid writing out all the characters | |
140 | * at the end of the file. | |
141 | */ | |
142 | if ((n = DEC(*p)) <= 0) | |
143 | break; | |
144 | for (++p; n > 0; p += 4, n -= 3) | |
145 | if (n >= 3) { | |
146 | ch = DEC(p[0]) << 2 | DEC(p[1]) >> 4; | |
147 | putchar(ch); | |
148 | ch = DEC(p[1]) << 4 | DEC(p[2]) >> 2; | |
149 | putchar(ch); | |
150 | ch = DEC(p[2]) << 6 | DEC(p[3]); | |
151 | putchar(ch); | |
152 | } | |
153 | else { | |
154 | if (n >= 1) { | |
155 | ch = DEC(p[0]) << 2 | DEC(p[1]) >> 4; | |
156 | putchar(ch); | |
157 | } | |
158 | if (n >= 2) { | |
159 | ch = DEC(p[1]) << 4 | DEC(p[2]) >> 2; | |
160 | putchar(ch); | |
161 | } | |
162 | if (n >= 3) { | |
163 | ch = DEC(p[2]) << 6 | DEC(p[3]); | |
164 | putchar(ch); | |
165 | } | |
166 | } | |
167 | } | |
168 | if (!fgets(buf, sizeof(buf), stdin) || strcmp(buf, "end\n")) { | |
169 | (void)fprintf(stderr, "uudecode: %s: no \"end\" line.\n", | |
170 | filename); | |
171 | return(1); | |
172 | } | |
173 | return(0); | |
174 | } | |
175 | ||
176 | usage() | |
177 | { | |
178 | (void)fprintf(stderr, "usage: uudecode [file ...]\n"); | |
179 | exit(1); | |
180 | } |