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 } 181