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 1.3 1993/08/27 22:30:54 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 <sys/param.h> 46 #include <sys/stat.h> 47 #include <pwd.h> 48 #include <stdio.h> 49 #include <string.h> 50 #include <errno.h> 51 52 static int decode(); 53 static void usage(); 54 char *filename; 55 56 /* ARGSUSED */ 57 int 58 main(argc, argv) 59 int argc; 60 char **argv; 61 { 62 int rval; 63 64 if (*++argv) { 65 rval = 0; 66 do { 67 if (!freopen(filename = *argv, "r", stdin)) { 68 (void)fprintf(stderr, "uudecode: %s: %s\n", 69 *argv, strerror(errno)); 70 rval = 1; 71 continue; 72 } 73 rval |= decode(); 74 } while (*++argv); 75 } else { 76 filename = "stdin"; 77 rval = decode(); 78 } 79 exit(rval); 80 } 81 82 static int 83 decode() 84 { 85 extern int errno; 86 struct passwd *pw; 87 register int n; 88 register char ch, *p; 89 int mode, n1; 90 char buf[MAXPATHLEN]; 91 92 /* search for header line */ 93 do { 94 if (!fgets(buf, sizeof(buf), stdin)) { 95 (void)fprintf(stderr, 96 "uudecode: %s: no \"begin\" line\n", filename); 97 return(1); 98 } 99 } while (strncmp(buf, "begin ", 6)); 100 (void)sscanf(buf, "begin %o %s", &mode, buf); 101 102 /* handle ~user/file format */ 103 if (buf[0] == '~') { 104 if (!(p = index(buf, '/'))) { 105 (void)fprintf(stderr, "uudecode: %s: illegal ~user.\n", 106 filename); 107 return(1); 108 } 109 *p++ = NULL; 110 if (!(pw = getpwnam(buf + 1))) { 111 (void)fprintf(stderr, "uudecode: %s: no user %s.\n", 112 filename, buf); 113 return(1); 114 } 115 n = strlen(pw->pw_dir); 116 n1 = strlen(p); 117 if (n + n1 + 2 > MAXPATHLEN) { 118 (void)fprintf(stderr, "uudecode: %s: path too long.\n", 119 filename); 120 return(1); 121 } 122 bcopy(p, buf + n + 1, n1 + 1); 123 bcopy(pw->pw_dir, buf, n); 124 buf[n] = '/'; 125 } 126 127 /* create output file, set mode */ 128 if (!freopen(buf, "w", stdout) || 129 fchmod(fileno(stdout), mode&0666)) { 130 (void)fprintf(stderr, "uudecode: %s: %s: %s\n", buf, 131 filename, strerror(errno)); 132 return(1); 133 } 134 135 /* for each input line */ 136 for (;;) { 137 if (!fgets(p = buf, sizeof(buf), stdin)) { 138 (void)fprintf(stderr, "uudecode: %s: short file.\n", 139 filename); 140 return(1); 141 } 142 #define DEC(c) (((c) - ' ') & 077) /* single character decode */ 143 /* 144 * `n' is used to avoid writing out all the characters 145 * at the end of the file. 146 */ 147 if ((n = DEC(*p)) <= 0) 148 break; 149 for (++p; n > 0; p += 4, n -= 3) 150 if (n >= 3) { 151 ch = DEC(p[0]) << 2 | DEC(p[1]) >> 4; 152 putchar(ch); 153 ch = DEC(p[1]) << 4 | DEC(p[2]) >> 2; 154 putchar(ch); 155 ch = DEC(p[2]) << 6 | DEC(p[3]); 156 putchar(ch); 157 } 158 else { 159 if (n >= 1) { 160 ch = DEC(p[0]) << 2 | DEC(p[1]) >> 4; 161 putchar(ch); 162 } 163 if (n >= 2) { 164 ch = DEC(p[1]) << 4 | DEC(p[2]) >> 2; 165 putchar(ch); 166 } 167 if (n >= 3) { 168 ch = DEC(p[2]) << 6 | DEC(p[3]); 169 putchar(ch); 170 } 171 } 172 } 173 if (!fgets(buf, sizeof(buf), stdin) || strcmp(buf, "end\n")) { 174 (void)fprintf(stderr, "uudecode: %s: no \"end\" line.\n", 175 filename); 176 return(1); 177 } 178 return(0); 179 } 180 181 static void 182 usage() 183 { 184 (void)fprintf(stderr, "usage: uudecode [file ...]\n"); 185 exit(1); 186 } 187