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 1.4 1993/11/09 01:46:38 jtc 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 <stdio.h> 46 #include <string.h> 47 #include <locale.h> 48 #include <errno.h> 49 #include <sys/param.h> 50 #include <sys/stat.h> 51 #include <pwd.h> 52 #include <unistd.h> 53 54 static int decode(); 55 static void usage(); 56 char *filename; 57 58 /* ARGSUSED */ 59 int 60 main(argc, argv) 61 int argc; 62 char **argv; 63 { 64 int rval; 65 66 setlocale(LC_ALL, ""); 67 68 while (getopt(argc, argv, "") != -1) 69 usage(); 70 argc -= optind; 71 argv += optind; 72 73 if (*argv) { 74 rval = 0; 75 do { 76 if (!freopen(filename = *argv, "r", stdin)) { 77 (void)fprintf(stderr, "uudecode: %s: %s\n", 78 *argv, strerror(errno)); 79 rval = 1; 80 continue; 81 } 82 rval |= decode(); 83 } while (*++argv); 84 } else { 85 filename = "stdin"; 86 rval = decode(); 87 } 88 exit(rval); 89 } 90 91 static int 92 decode() 93 { 94 extern int errno; 95 struct passwd *pw; 96 register int n; 97 register char ch, *p; 98 int mode, n1; 99 char buf[MAXPATHLEN]; 100 101 /* search for header line */ 102 do { 103 if (!fgets(buf, sizeof(buf), stdin)) { 104 (void)fprintf(stderr, 105 "uudecode: %s: no \"begin\" line\n", filename); 106 return(1); 107 } 108 } while (strncmp(buf, "begin ", 6)); 109 (void)sscanf(buf, "begin %o %s", &mode, buf); 110 111 /* handle ~user/file format */ 112 if (buf[0] == '~') { 113 if (!(p = index(buf, '/'))) { 114 (void)fprintf(stderr, "uudecode: %s: illegal ~user.\n", 115 filename); 116 return(1); 117 } 118 *p++ = NULL; 119 if (!(pw = getpwnam(buf + 1))) { 120 (void)fprintf(stderr, "uudecode: %s: no user %s.\n", 121 filename, buf); 122 return(1); 123 } 124 n = strlen(pw->pw_dir); 125 n1 = strlen(p); 126 if (n + n1 + 2 > MAXPATHLEN) { 127 (void)fprintf(stderr, "uudecode: %s: path too long.\n", 128 filename); 129 return(1); 130 } 131 bcopy(p, buf + n + 1, n1 + 1); 132 bcopy(pw->pw_dir, buf, n); 133 buf[n] = '/'; 134 } 135 136 /* create output file, set mode */ 137 if (!freopen(buf, "w", stdout) || 138 fchmod(fileno(stdout), mode&0666)) { 139 (void)fprintf(stderr, "uudecode: %s: %s: %s\n", buf, 140 filename, strerror(errno)); 141 return(1); 142 } 143 144 /* for each input line */ 145 for (;;) { 146 if (!fgets(p = buf, sizeof(buf), stdin)) { 147 (void)fprintf(stderr, "uudecode: %s: short file.\n", 148 filename); 149 return(1); 150 } 151 #define DEC(c) (((c) - ' ') & 077) /* single character decode */ 152 /* 153 * `n' is used to avoid writing out all the characters 154 * at the end of the file. 155 */ 156 if ((n = DEC(*p)) <= 0) 157 break; 158 for (++p; n > 0; p += 4, n -= 3) 159 if (n >= 3) { 160 ch = DEC(p[0]) << 2 | DEC(p[1]) >> 4; 161 putchar(ch); 162 ch = DEC(p[1]) << 4 | DEC(p[2]) >> 2; 163 putchar(ch); 164 ch = DEC(p[2]) << 6 | DEC(p[3]); 165 putchar(ch); 166 } 167 else { 168 if (n >= 1) { 169 ch = DEC(p[0]) << 2 | DEC(p[1]) >> 4; 170 putchar(ch); 171 } 172 if (n >= 2) { 173 ch = DEC(p[1]) << 4 | DEC(p[2]) >> 2; 174 putchar(ch); 175 } 176 if (n >= 3) { 177 ch = DEC(p[2]) << 6 | DEC(p[3]); 178 putchar(ch); 179 } 180 } 181 } 182 if (!fgets(buf, sizeof(buf), stdin) || strcmp(buf, "end\n")) { 183 (void)fprintf(stderr, "uudecode: %s: no \"end\" line.\n", 184 filename); 185 return(1); 186 } 187 return(0); 188 } 189 190 static void 191 usage() 192 { 193 (void)fprintf(stderr, "usage: uudecode [file ...]\n"); 194 exit(1); 195 } 196