Commit | Line | Data |
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4c7e459f SL |
1 | #ifndef lint |
2 | static char sccsid[] = "@(#)uudecode.c 5.1 (Berkeley) %G%"; | |
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; | |
23 | struct stat sbuf; | |
24 | int mode; | |
25 | char dest[128]; | |
26 | char buf[80]; | |
27 | ||
28 | /* optional input arg */ | |
29 | if (argc > 1) { | |
30 | if ((in = fopen(argv[1], "r")) == NULL) { | |
31 | perror(argv[1]); | |
32 | exit(1); | |
33 | } | |
34 | argv++; argc--; | |
35 | } else | |
36 | in = stdin; | |
37 | ||
38 | if (argc != 1) { | |
39 | printf("Usage: uudecode [infile]\n"); | |
40 | exit(2); | |
41 | } | |
42 | ||
43 | /* search for header line */ | |
44 | for (;;) { | |
45 | if (fgets(buf, sizeof buf, in) == NULL) { | |
46 | fprintf(stderr, "No begin line\n"); | |
47 | exit(3); | |
48 | } | |
49 | if (strncmp(buf, "begin ", 6) == 0) | |
50 | break; | |
51 | } | |
52 | sscanf(buf, "begin %o %s", &mode, dest); | |
53 | ||
54 | /* handle ~user/file format */ | |
55 | if (dest[0] == '~') { | |
56 | char *sl; | |
57 | struct passwd *getpwnam(); | |
58 | char *index(); | |
59 | struct passwd *user; | |
60 | char dnbuf[100]; | |
61 | ||
62 | sl = index(dest, '/'); | |
63 | if (sl == NULL) { | |
64 | fprintf(stderr, "Illegal ~user\n"); | |
65 | exit(3); | |
66 | } | |
67 | *sl++ = 0; | |
68 | user = getpwnam(dest+1); | |
69 | if (user == NULL) { | |
70 | fprintf(stderr, "No such user as %s\n", dest); | |
71 | exit(4); | |
72 | } | |
73 | strcpy(dnbuf, user->pw_dir); | |
74 | strcat(dnbuf, "/"); | |
75 | strcat(dnbuf, sl); | |
76 | strcpy(dest, dnbuf); | |
77 | } | |
78 | ||
79 | /* create output file */ | |
80 | out = fopen(dest, "w"); | |
81 | if (out == NULL) { | |
82 | perror(dest); | |
83 | exit(4); | |
84 | } | |
85 | chmod(dest, mode); | |
86 | ||
87 | decode(in, out); | |
88 | ||
89 | if (fgets(buf, sizeof buf, in) == NULL || strcmp(buf, "end\n")) { | |
90 | fprintf(stderr, "No end line\n"); | |
91 | exit(5); | |
92 | } | |
93 | exit(0); | |
94 | } | |
95 | ||
96 | /* | |
97 | * copy from in to out, decoding as you go along. | |
98 | */ | |
99 | decode(in, out) | |
100 | FILE *in; | |
101 | FILE *out; | |
102 | { | |
103 | char buf[80]; | |
104 | char *bp; | |
105 | int n; | |
106 | ||
107 | for (;;) { | |
108 | /* for each input line */ | |
109 | if (fgets(buf, sizeof buf, in) == NULL) { | |
110 | printf("Short file\n"); | |
111 | exit(10); | |
112 | } | |
113 | n = DEC(buf[0]); | |
114 | if (n <= 0) | |
115 | break; | |
116 | ||
117 | bp = &buf[1]; | |
118 | while (n > 0) { | |
119 | outdec(bp, out, n); | |
120 | bp += 4; | |
121 | n -= 3; | |
122 | } | |
123 | } | |
124 | } | |
125 | ||
126 | /* | |
127 | * output a group of 3 bytes (4 input characters). | |
128 | * the input chars are pointed to by p, they are to | |
129 | * be output to file f. n is used to tell us not to | |
130 | * output all of them at the end of the file. | |
131 | */ | |
132 | outdec(p, f, n) | |
133 | char *p; | |
134 | FILE *f; | |
135 | { | |
136 | int c1, c2, c3; | |
137 | ||
138 | c1 = DEC(*p) << 2 | DEC(p[1]) >> 4; | |
139 | c2 = DEC(p[1]) << 4 | DEC(p[2]) >> 2; | |
140 | c3 = DEC(p[2]) << 6 | DEC(p[3]); | |
141 | if (n >= 1) | |
142 | putc(c1, f); | |
143 | if (n >= 2) | |
144 | putc(c2, f); | |
145 | if (n >= 3) | |
146 | putc(c3, f); | |
147 | } | |
148 | ||
149 | ||
150 | /* fr: like read but stdio */ | |
151 | int | |
152 | fr(fd, buf, cnt) | |
153 | FILE *fd; | |
154 | char *buf; | |
155 | int cnt; | |
156 | { | |
157 | int c, i; | |
158 | ||
159 | for (i=0; i<cnt; i++) { | |
160 | c = getc(fd); | |
161 | if (c == EOF) | |
162 | return(i); | |
163 | buf[i] = c; | |
164 | } | |
165 | return (cnt); | |
166 | } | |
167 | ||
168 | /* | |
169 | * Return the ptr in sp at which the character c appears; | |
170 | * NULL if not found | |
171 | */ | |
172 | ||
173 | #define NULL 0 | |
174 | ||
175 | char * | |
176 | index(sp, c) | |
177 | register char *sp, c; | |
178 | { | |
179 | do { | |
180 | if (*sp == c) | |
181 | return(sp); | |
182 | } while (*sp++); | |
183 | return(NULL); | |
184 | } |