Commit | Line | Data |
---|---|---|
6296bb1b KB |
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 are permitted | |
6 | * provided that the above copyright notice and this paragraph are | |
7 | * duplicated in all such forms and that any documentation, | |
8 | * advertising materials, and other materials related to such | |
9 | * distribution and use acknowledge that the software was developed | |
10 | * by the University of California, Berkeley. The name of the | |
11 | * University may not be used to endorse or promote products derived | |
12 | * from this software without specific prior written permission. | |
13 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR | |
14 | * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED | |
15 | * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. | |
16 | */ | |
17 | ||
4c7e459f | 18 | #ifndef lint |
6296bb1b KB |
19 | static char sccsid[] = "@(#)uudecode.c 5.4 (Berkeley) %G%"; |
20 | #endif /* not lint */ | |
4c7e459f SL |
21 | |
22 | /* | |
23 | * uudecode [input] | |
24 | * | |
25 | * create the specified file, decoding as you go. | |
26 | * used with uuencode. | |
27 | */ | |
28 | #include <stdio.h> | |
29 | #include <pwd.h> | |
30 | #include <sys/types.h> | |
31 | #include <sys/stat.h> | |
32 | ||
33 | /* single character decode */ | |
34 | #define DEC(c) (((c) - ' ') & 077) | |
35 | ||
36 | main(argc, argv) | |
37 | char **argv; | |
38 | { | |
39 | FILE *in, *out; | |
4c7e459f SL |
40 | int mode; |
41 | char dest[128]; | |
42 | char buf[80]; | |
43 | ||
44 | /* optional input arg */ | |
45 | if (argc > 1) { | |
46 | if ((in = fopen(argv[1], "r")) == NULL) { | |
47 | perror(argv[1]); | |
48 | exit(1); | |
49 | } | |
50 | argv++; argc--; | |
51 | } else | |
52 | in = stdin; | |
53 | ||
54 | if (argc != 1) { | |
55 | printf("Usage: uudecode [infile]\n"); | |
56 | exit(2); | |
57 | } | |
58 | ||
59 | /* search for header line */ | |
60 | for (;;) { | |
61 | if (fgets(buf, sizeof buf, in) == NULL) { | |
62 | fprintf(stderr, "No begin line\n"); | |
63 | exit(3); | |
64 | } | |
65 | if (strncmp(buf, "begin ", 6) == 0) | |
66 | break; | |
67 | } | |
68 | sscanf(buf, "begin %o %s", &mode, dest); | |
69 | ||
70 | /* handle ~user/file format */ | |
71 | if (dest[0] == '~') { | |
72 | char *sl; | |
73 | struct passwd *getpwnam(); | |
74 | char *index(); | |
75 | struct passwd *user; | |
76 | char dnbuf[100]; | |
77 | ||
78 | sl = index(dest, '/'); | |
79 | if (sl == NULL) { | |
80 | fprintf(stderr, "Illegal ~user\n"); | |
81 | exit(3); | |
82 | } | |
83 | *sl++ = 0; | |
84 | user = getpwnam(dest+1); | |
85 | if (user == NULL) { | |
86 | fprintf(stderr, "No such user as %s\n", dest); | |
87 | exit(4); | |
88 | } | |
89 | strcpy(dnbuf, user->pw_dir); | |
90 | strcat(dnbuf, "/"); | |
91 | strcat(dnbuf, sl); | |
92 | strcpy(dest, dnbuf); | |
93 | } | |
94 | ||
95 | /* create output file */ | |
96 | out = fopen(dest, "w"); | |
97 | if (out == NULL) { | |
98 | perror(dest); | |
99 | exit(4); | |
100 | } | |
101 | chmod(dest, mode); | |
102 | ||
103 | decode(in, out); | |
104 | ||
105 | if (fgets(buf, sizeof buf, in) == NULL || strcmp(buf, "end\n")) { | |
106 | fprintf(stderr, "No end line\n"); | |
107 | exit(5); | |
108 | } | |
109 | exit(0); | |
110 | } | |
111 | ||
112 | /* | |
113 | * copy from in to out, decoding as you go along. | |
114 | */ | |
115 | decode(in, out) | |
116 | FILE *in; | |
117 | FILE *out; | |
118 | { | |
119 | char buf[80]; | |
120 | char *bp; | |
121 | int n; | |
122 | ||
123 | for (;;) { | |
124 | /* for each input line */ | |
125 | if (fgets(buf, sizeof buf, in) == NULL) { | |
126 | printf("Short file\n"); | |
127 | exit(10); | |
128 | } | |
129 | n = DEC(buf[0]); | |
130 | if (n <= 0) | |
131 | break; | |
132 | ||
133 | bp = &buf[1]; | |
134 | while (n > 0) { | |
135 | outdec(bp, out, n); | |
136 | bp += 4; | |
137 | n -= 3; | |
138 | } | |
139 | } | |
140 | } | |
141 | ||
142 | /* | |
143 | * output a group of 3 bytes (4 input characters). | |
144 | * the input chars are pointed to by p, they are to | |
145 | * be output to file f. n is used to tell us not to | |
146 | * output all of them at the end of the file. | |
147 | */ | |
148 | outdec(p, f, n) | |
149 | char *p; | |
150 | FILE *f; | |
151 | { | |
152 | int c1, c2, c3; | |
153 | ||
154 | c1 = DEC(*p) << 2 | DEC(p[1]) >> 4; | |
155 | c2 = DEC(p[1]) << 4 | DEC(p[2]) >> 2; | |
156 | c3 = DEC(p[2]) << 6 | DEC(p[3]); | |
157 | if (n >= 1) | |
158 | putc(c1, f); | |
159 | if (n >= 2) | |
160 | putc(c2, f); | |
161 | if (n >= 3) | |
162 | putc(c3, f); | |
163 | } | |
164 | ||
165 | ||
166 | /* fr: like read but stdio */ | |
167 | int | |
168 | fr(fd, buf, cnt) | |
169 | FILE *fd; | |
170 | char *buf; | |
171 | int cnt; | |
172 | { | |
173 | int c, i; | |
174 | ||
175 | for (i=0; i<cnt; i++) { | |
176 | c = getc(fd); | |
177 | if (c == EOF) | |
178 | return(i); | |
179 | buf[i] = c; | |
180 | } | |
181 | return (cnt); | |
182 | } | |
183 | ||
184 | /* | |
185 | * Return the ptr in sp at which the character c appears; | |
186 | * NULL if not found | |
187 | */ | |
188 | ||
189 | #define NULL 0 | |
190 | ||
191 | char * | |
192 | index(sp, c) | |
193 | register char *sp, c; | |
194 | { | |
195 | do { | |
196 | if (*sp == c) | |
197 | return(sp); | |
198 | } while (*sp++); | |
199 | return(NULL); | |
200 | } |