274 lines
6.7 KiB
C
274 lines
6.7 KiB
C
/*-
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* Copyright (c) 1983, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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char copyright[] =
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"@(#) Copyright (c) 1983, 1993\n\
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The Regents of the University of California. All rights reserved.\n";
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#endif /* not lint */
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#ifndef lint
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static char sccsid[] = "@(#)uudecode.c 8.2 (Berkeley) 4/2/94";
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#endif /* not lint */
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/*
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* uudecode [file ...]
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*
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* create the specified file, decoding as you go.
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* used with uuencode.
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*/
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#include <sys/param.h>
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#include <sys/stat.h>
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#include <fnmatch.h>
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#include <pwd.h>
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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char *filename;
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int cflag, pflag;
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void usage __P((void));
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int decode __P((void));
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int decode2 __P((int));
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extern int optind;
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int
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main(argc, argv)
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int argc;
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char *argv[];
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{
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extern int errno;
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int rval, ch;
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while ((ch = getopt(argc, argv, "cp")) != -1) {
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switch(ch) {
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case 'c':
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cflag = 1; /* multiple uudecode'd files */
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break;
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case 'p':
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pflag = 1; /* print output to stdout */
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break;
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default:
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(void)usage();
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}
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}
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argc -= optind;
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argv += optind;
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if (*argv) {
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rval = 0;
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do {
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if (!freopen(filename = *argv, "r", stdin)) {
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(void)fprintf(stderr, "uudecode: %s: %s\n",
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*argv, strerror(errno));
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rval = 1;
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continue;
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}
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rval |= decode();
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} while (*++argv);
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} else {
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filename = "stdin";
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rval = decode();
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}
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exit(rval);
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}
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int
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decode ()
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{
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int flag;
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/* decode only one file per input stream */
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if (!cflag)
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return(decode2(0));
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/* multiple uudecode'd files */
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for (flag = 0; ; flag++)
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if (decode2(flag))
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return(1);
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else if (feof(stdin))
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break;
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return(0);
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}
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int
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decode2(flag)
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int flag;
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{
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extern int errno;
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struct passwd *pw;
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register int n;
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register char ch, *p;
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int mode, n1;
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char buf[MAXPATHLEN];
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char buffn[MAXPATHLEN]; /* file name buffer */
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/* search for header line */
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do {
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if (!fgets(buf, sizeof(buf), stdin)) {
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if (flag) /* no error */
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return(0);
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(void)fprintf(stderr,
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"uudecode: %s: no \"begin\" line\n", filename);
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return(1);
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}
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} while (strncmp(buf, "begin ", 6) ||
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fnmatch("begin [0-7]* *", buf, 0));
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(void)sscanf(buf, "begin %o %s", &mode, buf);
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/* handle ~user/file format */
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if (buf[0] == '~') {
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if (!(p = index(buf, '/'))) {
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(void)fprintf(stderr, "uudecode: %s: illegal ~user.\n",
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filename);
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return(1);
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}
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*p++ = NULL;
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if (!(pw = getpwnam(buf + 1))) {
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(void)fprintf(stderr, "uudecode: %s: no user %s.\n",
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filename, buf);
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return(1);
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}
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n = strlen(pw->pw_dir);
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n1 = strlen(p);
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if (n + n1 + 2 > MAXPATHLEN) {
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(void)fprintf(stderr, "uudecode: %s: path too long.\n",
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filename);
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return(1);
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}
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bcopy(p, buf + n + 1, n1 + 1);
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bcopy(pw->pw_dir, buf, n);
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buf[n] = '/';
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}
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/* create output file, set mode */
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if (pflag)
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; /* print to stdout */
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else if (!freopen(buf, "w", stdout) ||
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fchmod(fileno(stdout), mode&0666)) {
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(void)fprintf(stderr, "uudecode: %s: %s: %s\n", buf,
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filename, strerror(errno));
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return(1);
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}
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strcpy(buffn, buf); /* store file name from header line */
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/* for each input line */
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for (;;) {
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if (!fgets(p = buf, sizeof(buf), stdin)) {
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(void)fprintf(stderr, "uudecode: %s: short file.\n",
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filename);
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return(1);
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}
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#define DEC(c) (((c) - ' ') & 077) /* single character decode */
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#define IS_DEC(c) ( (((c) - ' ') >= 0) && (((c) - ' ') <= 077 + 1) )
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/* #define IS_DEC(c) (1) */
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#define OUT_OF_RANGE \
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{ \
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(void)fprintf(stderr, \
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"uudecode:\n\tinput file: %s\n\tencoded file: %s\n\t%s: [%d-%d]\n", \
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filename, buffn, "character out of range", 1 + ' ', 077 + ' ' + 1); \
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return(1); \
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}
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/*
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* `n' is used to avoid writing out all the characters
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* at the end of the file.
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*/
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if ((n = DEC(*p)) <= 0)
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break;
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for (++p; n > 0; p += 4, n -= 3)
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if (n >= 3) {
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if (!(IS_DEC(*p) && IS_DEC(*(p + 1)) &&
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IS_DEC(*(p + 2)) && IS_DEC(*(p + 3))))
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OUT_OF_RANGE
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ch = DEC(p[0]) << 2 | DEC(p[1]) >> 4;
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putchar(ch);
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ch = DEC(p[1]) << 4 | DEC(p[2]) >> 2;
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putchar(ch);
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ch = DEC(p[2]) << 6 | DEC(p[3]);
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putchar(ch);
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}
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else {
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if (n >= 1) {
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if (!(IS_DEC(*p) && IS_DEC(*(p + 1))))
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OUT_OF_RANGE
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ch = DEC(p[0]) << 2 | DEC(p[1]) >> 4;
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putchar(ch);
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}
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if (n >= 2) {
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if (!(IS_DEC(*(p + 1)) &&
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IS_DEC(*(p + 2))))
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OUT_OF_RANGE
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ch = DEC(p[1]) << 4 | DEC(p[2]) >> 2;
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putchar(ch);
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}
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if (n >= 3) {
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if (!(IS_DEC(*(p + 2)) &&
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IS_DEC(*(p + 3))))
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OUT_OF_RANGE
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ch = DEC(p[2]) << 6 | DEC(p[3]);
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putchar(ch);
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}
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}
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}
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if (fgets(buf, sizeof(buf), stdin) == NULL ||
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(strcmp(buf, "end") && strcmp(buf, "end\n") &&
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strcmp(buf, "end\r\n"))) {
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(void)fprintf(stderr, "uudecode: %s: no \"end\" line.\n",
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filename);
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return(1);
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}
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return(0);
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}
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void
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usage()
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{
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(void)fprintf(stderr, "usage: uudecode [-cp] [file ...]\n");
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exit(1);
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}
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