Commit | Line | Data |
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4c7e459f | 1 | #ifndef lint |
1a85e9d2 | 2 | static char sccsid[] = "@(#)uudecode.c 5.3 (Berkeley) %G%"; |
4c7e459f SL |
3 | #endif |
4 | ||
5 | /* | |
6 | * uudecode [input] | |
7 | * | |
8 | * create the specified file, decoding as you go. | |
9 | * used with uuencode. | |
10 | */ | |
11 | #include <stdio.h> | |
12 | #include <pwd.h> | |
13 | #include <sys/types.h> | |
14 | #include <sys/stat.h> | |
15 | ||
16 | /* single character decode */ | |
17 | #define DEC(c) (((c) - ' ') & 077) | |
18 | ||
19 | main(argc, argv) | |
20 | char **argv; | |
21 | { | |
22 | FILE *in, *out; | |
4c7e459f SL |
23 | int mode; |
24 | char dest[128]; | |
25 | char buf[80]; | |
26 | ||
27 | /* optional input arg */ | |
28 | if (argc > 1) { | |
29 | if ((in = fopen(argv[1], "r")) == NULL) { | |
30 | perror(argv[1]); | |
31 | exit(1); | |
32 | } | |
33 | argv++; argc--; | |
34 | } else | |
35 | in = stdin; | |
36 | ||
37 | if (argc != 1) { | |
38 | printf("Usage: uudecode [infile]\n"); | |
39 | exit(2); | |
40 | } | |
41 | ||
42 | /* search for header line */ | |
43 | for (;;) { | |
44 | if (fgets(buf, sizeof buf, in) == NULL) { | |
45 | fprintf(stderr, "No begin line\n"); | |
46 | exit(3); | |
47 | } | |
48 | if (strncmp(buf, "begin ", 6) == 0) | |
49 | break; | |
50 | } | |
51 | sscanf(buf, "begin %o %s", &mode, dest); | |
52 | ||
53 | /* handle ~user/file format */ | |
54 | if (dest[0] == '~') { | |
55 | char *sl; | |
56 | struct passwd *getpwnam(); | |
57 | char *index(); | |
58 | struct passwd *user; | |
59 | char dnbuf[100]; | |
60 | ||
61 | sl = index(dest, '/'); | |
62 | if (sl == NULL) { | |
63 | fprintf(stderr, "Illegal ~user\n"); | |
64 | exit(3); | |
65 | } | |
66 | *sl++ = 0; | |
67 | user = getpwnam(dest+1); | |
68 | if (user == NULL) { | |
69 | fprintf(stderr, "No such user as %s\n", dest); | |
70 | exit(4); | |
71 | } | |
72 | strcpy(dnbuf, user->pw_dir); | |
73 | strcat(dnbuf, "/"); | |
74 | strcat(dnbuf, sl); | |
75 | strcpy(dest, dnbuf); | |
76 | } | |
77 | ||
78 | /* create output file */ | |
79 | out = fopen(dest, "w"); | |
80 | if (out == NULL) { | |
81 | perror(dest); | |
82 | exit(4); | |
83 | } | |
84 | chmod(dest, mode); | |
85 | ||
86 | decode(in, out); | |
87 | ||
88 | if (fgets(buf, sizeof buf, in) == NULL || strcmp(buf, "end\n")) { | |
89 | fprintf(stderr, "No end line\n"); | |
90 | exit(5); | |
91 | } | |
92 | exit(0); | |
93 | } | |
94 | ||
95 | /* | |
96 | * copy from in to out, decoding as you go along. | |
97 | */ | |
98 | decode(in, out) | |
99 | FILE *in; | |
100 | FILE *out; | |
101 | { | |
102 | char buf[80]; | |
103 | char *bp; | |
104 | int n; | |
105 | ||
106 | for (;;) { | |
107 | /* for each input line */ | |
108 | if (fgets(buf, sizeof buf, in) == NULL) { | |
109 | printf("Short file\n"); | |
110 | exit(10); | |
111 | } | |
112 | n = DEC(buf[0]); | |
113 | if (n <= 0) | |
114 | break; | |
115 | ||
116 | bp = &buf[1]; | |
117 | while (n > 0) { | |
118 | outdec(bp, out, n); | |
119 | bp += 4; | |
120 | n -= 3; | |
121 | } | |
122 | } | |
123 | } | |
124 | ||
125 | /* | |
126 | * output a group of 3 bytes (4 input characters). | |
127 | * the input chars are pointed to by p, they are to | |
128 | * be output to file f. n is used to tell us not to | |
129 | * output all of them at the end of the file. | |
130 | */ | |
131 | outdec(p, f, n) | |
132 | char *p; | |
133 | FILE *f; | |
134 | { | |
135 | int c1, c2, c3; | |
136 | ||
137 | c1 = DEC(*p) << 2 | DEC(p[1]) >> 4; | |
138 | c2 = DEC(p[1]) << 4 | DEC(p[2]) >> 2; | |
139 | c3 = DEC(p[2]) << 6 | DEC(p[3]); | |
140 | if (n >= 1) | |
141 | putc(c1, f); | |
142 | if (n >= 2) | |
143 | putc(c2, f); | |
144 | if (n >= 3) | |
145 | putc(c3, f); | |
146 | } | |
147 | ||
148 | ||
149 | /* fr: like read but stdio */ | |
150 | int | |
151 | fr(fd, buf, cnt) | |
152 | FILE *fd; | |
153 | char *buf; | |
154 | int cnt; | |
155 | { | |
156 | int c, i; | |
157 | ||
158 | for (i=0; i<cnt; i++) { | |
159 | c = getc(fd); | |
160 | if (c == EOF) | |
161 | return(i); | |
162 | buf[i] = c; | |
163 | } | |
164 | return (cnt); | |
165 | } | |
166 | ||
167 | /* | |
168 | * Return the ptr in sp at which the character c appears; | |
169 | * NULL if not found | |
170 | */ | |
171 | ||
172 | #define NULL 0 | |
173 | ||
174 | char * | |
175 | index(sp, c) | |
176 | register char *sp, c; | |
177 | { | |
178 | do { | |
179 | if (*sp == c) | |
180 | return(sp); | |
181 | } while (*sp++); | |
182 | return(NULL); | |
183 | } |