uudecode.c revision 1591
1/*- 2 * Copyright (c) 1983, 1993 3 * The Regents of the University of California. 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 35char copyright[] = 36"@(#) Copyright (c) 1983, 1993\n\ 37 The Regents of the University of California. All rights reserved.\n"; 38#endif /* not lint */ 39 40#ifndef lint 41static char sccsid[] = "@(#)uudecode.c 8.2 (Berkeley) 4/2/94"; 42#endif /* not lint */ 43 44/* 45 * uudecode [file ...] 46 * 47 * create the specified file, decoding as you go. 48 * used with uuencode. 49 */ 50#include <sys/param.h> 51#include <sys/stat.h> 52 53#include <pwd.h> 54#include <stdio.h> 55#include <string.h> 56 57char *filename; 58 59int 60main(argc, argv) 61 int argc; 62 char *argv[]; 63{ 64 extern int errno; 65 int rval; 66 67 if (*++argv) { 68 rval = 0; 69 do { 70 if (!freopen(filename = *argv, "r", stdin)) { 71 (void)fprintf(stderr, "uudecode: %s: %s\n", 72 *argv, strerror(errno)); 73 rval = 1; 74 continue; 75 } 76 rval |= decode(); 77 } while (*++argv); 78 } else { 79 filename = "stdin"; 80 rval = decode(); 81 } 82 exit(rval); 83} 84 85decode() 86{ 87 extern int errno; 88 struct passwd *pw; 89 register int n; 90 register char ch, *p; 91 int mode, n1; 92 char buf[MAXPATHLEN]; 93 94 /* search for header line */ 95 do { 96 if (!fgets(buf, sizeof(buf), stdin)) { 97 (void)fprintf(stderr, 98 "uudecode: %s: no \"begin\" line\n", filename); 99 return(1); 100 } 101 } while (strncmp(buf, "begin ", 6)); 102 (void)sscanf(buf, "begin %o %s", &mode, buf); 103 104 /* handle ~user/file format */ 105 if (buf[0] == '~') { 106 if (!(p = index(buf, '/'))) { 107 (void)fprintf(stderr, "uudecode: %s: illegal ~user.\n", 108 filename); 109 return(1); 110 } 111 *p++ = NULL; 112 if (!(pw = getpwnam(buf + 1))) { 113 (void)fprintf(stderr, "uudecode: %s: no user %s.\n", 114 filename, buf); 115 return(1); 116 } 117 n = strlen(pw->pw_dir); 118 n1 = strlen(p); 119 if (n + n1 + 2 > MAXPATHLEN) { 120 (void)fprintf(stderr, "uudecode: %s: path too long.\n", 121 filename); 122 return(1); 123 } 124 bcopy(p, buf + n + 1, n1 + 1); 125 bcopy(pw->pw_dir, buf, n); 126 buf[n] = '/'; 127 } 128 129 /* create output file, set mode */ 130 if (!freopen(buf, "w", stdout) || 131 fchmod(fileno(stdout), mode&0666)) { 132 (void)fprintf(stderr, "uudecode: %s: %s: %s\n", buf, 133 filename, strerror(errno)); 134 return(1); 135 } 136 137 /* for each input line */ 138 for (;;) { 139 if (!fgets(p = buf, sizeof(buf), stdin)) { 140 (void)fprintf(stderr, "uudecode: %s: short file.\n", 141 filename); 142 return(1); 143 } 144#define DEC(c) (((c) - ' ') & 077) /* single character decode */ 145 /* 146 * `n' is used to avoid writing out all the characters 147 * at the end of the file. 148 */ 149 if ((n = DEC(*p)) <= 0) 150 break; 151 for (++p; n > 0; p += 4, n -= 3) 152 if (n >= 3) { 153 ch = DEC(p[0]) << 2 | DEC(p[1]) >> 4; 154 putchar(ch); 155 ch = DEC(p[1]) << 4 | DEC(p[2]) >> 2; 156 putchar(ch); 157 ch = DEC(p[2]) << 6 | DEC(p[3]); 158 putchar(ch); 159 } 160 else { 161 if (n >= 1) { 162 ch = DEC(p[0]) << 2 | DEC(p[1]) >> 4; 163 putchar(ch); 164 } 165 if (n >= 2) { 166 ch = DEC(p[1]) << 4 | DEC(p[2]) >> 2; 167 putchar(ch); 168 } 169 if (n >= 3) { 170 ch = DEC(p[2]) << 6 | DEC(p[3]); 171 putchar(ch); 172 } 173 } 174 } 175 if (!fgets(buf, sizeof(buf), stdin) || strcmp(buf, "end\n")) { 176 (void)fprintf(stderr, "uudecode: %s: no \"end\" line.\n", 177 filename); 178 return(1); 179 } 180 return(0); 181} 182 183usage() 184{ 185 (void)fprintf(stderr, "usage: uudecode [file ...]\n"); 186 exit(1); 187} 188