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[] = "from: @(#)uudecode.c 5.10 (Berkeley) 6/1/90";*/ 36 static char rcsid[] = "$Id: uudecode.c,v 1.2 1993/08/01 18:03:42 mycroft Exp $"; 37 #endif /* not lint */ 38 39 /* 40 * uudecode [file ...] 41 * 42 * create the specified file, decoding as you go. 43 * used with uuencode. 44 */ 45 #include <sys/param.h> 46 #include <sys/stat.h> 47 #include <pwd.h> 48 #include <stdio.h> 49 #include <string.h> 50 51 char *filename; 52 53 /* ARGSUSED */ 54 main(argc, argv) 55 int argc; 56 char **argv; 57 { 58 extern int errno; 59 int rval; 60 61 if (*++argv) { 62 rval = 0; 63 do { 64 if (!freopen(filename = *argv, "r", stdin)) { 65 (void)fprintf(stderr, "uudecode: %s: %s\n", 66 *argv, strerror(errno)); 67 rval = 1; 68 continue; 69 } 70 rval |= decode(); 71 } while (*++argv); 72 } else { 73 filename = "stdin"; 74 rval = decode(); 75 } 76 exit(rval); 77 } 78 79 decode() 80 { 81 extern int errno; 82 struct passwd *pw; 83 register int n; 84 register char ch, *p; 85 int mode, n1; 86 char buf[MAXPATHLEN]; 87 88 /* search for header line */ 89 do { 90 if (!fgets(buf, sizeof(buf), stdin)) { 91 (void)fprintf(stderr, 92 "uudecode: %s: no \"begin\" line\n", filename); 93 return(1); 94 } 95 } while (strncmp(buf, "begin ", 6)); 96 (void)sscanf(buf, "begin %o %s", &mode, buf); 97 98 /* handle ~user/file format */ 99 if (buf[0] == '~') { 100 if (!(p = index(buf, '/'))) { 101 (void)fprintf(stderr, "uudecode: %s: illegal ~user.\n", 102 filename); 103 return(1); 104 } 105 *p++ = NULL; 106 if (!(pw = getpwnam(buf + 1))) { 107 (void)fprintf(stderr, "uudecode: %s: no user %s.\n", 108 filename, buf); 109 return(1); 110 } 111 n = strlen(pw->pw_dir); 112 n1 = strlen(p); 113 if (n + n1 + 2 > MAXPATHLEN) { 114 (void)fprintf(stderr, "uudecode: %s: path too long.\n", 115 filename); 116 return(1); 117 } 118 bcopy(p, buf + n + 1, n1 + 1); 119 bcopy(pw->pw_dir, buf, n); 120 buf[n] = '/'; 121 } 122 123 /* create output file, set mode */ 124 if (!freopen(buf, "w", stdout) || 125 fchmod(fileno(stdout), mode&0666)) { 126 (void)fprintf(stderr, "uudecode: %s: %s: %s\n", buf, 127 filename, strerror(errno)); 128 return(1); 129 } 130 131 /* for each input line */ 132 for (;;) { 133 if (!fgets(p = buf, sizeof(buf), stdin)) { 134 (void)fprintf(stderr, "uudecode: %s: short file.\n", 135 filename); 136 return(1); 137 } 138 #define DEC(c) (((c) - ' ') & 077) /* single character decode */ 139 /* 140 * `n' is used to avoid writing out all the characters 141 * at the end of the file. 142 */ 143 if ((n = DEC(*p)) <= 0) 144 break; 145 for (++p; n > 0; p += 4, n -= 3) 146 if (n >= 3) { 147 ch = DEC(p[0]) << 2 | DEC(p[1]) >> 4; 148 putchar(ch); 149 ch = DEC(p[1]) << 4 | DEC(p[2]) >> 2; 150 putchar(ch); 151 ch = DEC(p[2]) << 6 | DEC(p[3]); 152 putchar(ch); 153 } 154 else { 155 if (n >= 1) { 156 ch = DEC(p[0]) << 2 | DEC(p[1]) >> 4; 157 putchar(ch); 158 } 159 if (n >= 2) { 160 ch = DEC(p[1]) << 4 | DEC(p[2]) >> 2; 161 putchar(ch); 162 } 163 if (n >= 3) { 164 ch = DEC(p[2]) << 6 | DEC(p[3]); 165 putchar(ch); 166 } 167 } 168 } 169 if (!fgets(buf, sizeof(buf), stdin) || strcmp(buf, "end\n")) { 170 (void)fprintf(stderr, "uudecode: %s: no \"end\" line.\n", 171 filename); 172 return(1); 173 } 174 return(0); 175 } 176 177 usage() 178 { 179 (void)fprintf(stderr, "usage: uudecode [file ...]\n"); 180 exit(1); 181 } 182