Porting uuencode/uudecode from NetBSD
Lionel: I fixed small mistakes in the mi file, typos, missing keywords,
and whitespace fixes.
Change-Id: If0c04b923af328838f2d0950e189bf28995bc0f0
This commit is contained in:
Sky Liu
323
usr.bin/uudecode/uudecode.c
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323
usr.bin/uudecode/uudecode.c
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@@ -0,0 +1,323 @@
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/* $NetBSD: uudecode.c,v 1.28 2013/01/28 19:50:30 apb Exp $ */
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/*-
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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. 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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#if HAVE_NBTOOL_CONFIG_H
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#include "nbtool_config.h"
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#endif
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#include <sys/cdefs.h>
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#if !defined(lint)
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__COPYRIGHT("@(#) Copyright (c) 1983, 1993\
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The Regents of the University of California. All rights reserved.");
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#if 0
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static char sccsid[] = "@(#)uudecode.c 8.2 (Berkeley) 4/2/94";
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#endif
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__RCSID("$NetBSD: uudecode.c,v 1.28 2013/01/28 19:50:30 apb Exp $");
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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 <ctype.h>
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#include <err.h>
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#include <errno.h>
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#include <limits.h>
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#include <locale.h>
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#include <pwd.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#ifndef NO_BASE64
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#include <netinet/in.h>
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#include <resolv.h>
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#endif
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static int decode(char *);
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__dead static void usage(void);
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static int checkend(const char *, const char *, const char *);
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static int base64_decode(void);
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static int base64;
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static const char *inputname;
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int
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main(int argc, char *argv[])
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{
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int ch, rval;
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char *outputname = NULL;
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setlocale(LC_ALL, "");
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setprogname(argv[0]);
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while ((ch = getopt(argc, argv, "mo:p")) != -1)
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switch (ch) {
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case 'm':
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base64 = 1;
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break;
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case 'o':
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outputname = optarg;
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break;
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case 'p':
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outputname = __UNCONST("/dev/stdout");
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break;
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default:
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usage();
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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(inputname = *argv, "r", stdin)) {
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warn("%s", *argv);
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rval = 1;
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continue;
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}
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rval |= decode(outputname);
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} while (*++argv);
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} else {
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inputname = "stdin";
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rval = decode(outputname);
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}
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exit(rval);
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}
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/*
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* Decode one file from stdin. If outputname is not NULL
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* then it overrides the file name embedded in the input data.
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*/
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static int
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decode(char *outputname)
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{
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struct passwd *pw;
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int n;
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char ch, *p;
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int n1;
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long mode;
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char *fn;
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char buf[MAXPATHLEN];
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/* search for header line */
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for (;;) {
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if (!fgets(buf, sizeof(buf), stdin)) {
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warnx("%s: no \"%s\" line", inputname, base64 ?
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"begin-base64" : "begin");
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return(1);
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}
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p = buf;
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if (strncmp(p, "begin-base64", 12) == 0) {
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base64 = 1;
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p += 13;
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break;
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} else if (strncmp(p, "begin", 5) == 0) {
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p += 6;
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break;
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} else
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continue;
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}
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/* must be followed by an octal mode and a space */
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mode = strtol(p, &fn, 8);
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if (fn == (p) || !isspace((unsigned char)*fn) || mode==LONG_MIN || mode==LONG_MAX)
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{
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warnx("%s: invalid mode on \"%s\" line", inputname,
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base64 ? "begin-base64" : "begin");
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return(1);
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}
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/* skip whitespace for file name */
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while (*fn && isspace((unsigned char)*fn)) fn++;
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if (*fn == 0) {
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warnx("%s: no filename on \"%s\" line", inputname,
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base64 ? "begin-base64" : "begin");
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return(1);
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}
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/* zap newline */
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for (p = fn; *p && *p != '\n'; p++)
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;
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if (*p) *p = 0;
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/* outputname overrides fn */
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if (outputname)
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fn = outputname;
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/* handle ~user/file format */
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if (*fn == '~') {
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if (!(p = strchr(fn, '/'))) {
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warnx("%s: illegal ~user.", inputname);
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return(1);
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}
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*p++ = '\0';
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if (!(pw = getpwnam(fn + 1))) {
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warnx("%s: no user %s.", inputname, 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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warnx("%s: path too long.", inputname);
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return(1);
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}
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/* make space at beginning of buf by moving end of pathname */
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memmove(buf + n + 1, p, n1 + 1);
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memmove(buf, pw->pw_dir, n);
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buf[n] = '/';
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fn = buf;
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}
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if (strcmp(fn, "/dev/stdout") == 0 || strcmp(fn, "-") == 0) {
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/*
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* POSIX.1-2008 says that both "-" and "/dev/stdout"
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* refer to standard output when they appear in the file
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* header, but only "/dev/stdout" refers to standard
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* output when it appears as the argument to the "-o"
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* command line option.
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*
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* We handle both special names, regardless of whether
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* they came from the "-o" option or from the header of
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* the input stream.
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*/
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} else {
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/*
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* Create output file, and set its mode. POSIX.1-2008
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* requires the mode to be used exactly, ignoring the
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* umask and anything else, but we mask it with 0666.
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*/
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if (freopen(fn, "w", stdout) == NULL ||
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fchmod(fileno(stdout), mode & 0666) != 0) {
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warn("%s: %s", fn, inputname);
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return(1);
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}
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}
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if (base64)
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return base64_decode();
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else {
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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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warnx("%s: short file.", inputname);
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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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/*
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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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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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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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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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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) || strcmp(buf, "end\n")) {
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warnx("%s: no \"end\" line.", inputname);
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return(1);
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}
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return(0);
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}
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}
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static int
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checkend(const char *ptr, const char *end, const char *msg)
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{
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size_t n;
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n = strlen(end);
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if (strncmp(ptr, end, n) != 0 ||
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strspn(ptr + n, "\t\r\n") != strlen(ptr + n)) {
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warnx("%s", msg);
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return (1);
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}
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return (0);
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}
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static int
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base64_decode(void)
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{
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int n;
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char inbuf[MAXPATHLEN];
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unsigned char outbuf[MAXPATHLEN * 4];
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for (;;) {
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if (!fgets(inbuf, sizeof(inbuf), stdin)) {
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warnx("%s: short file.", inputname);
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return (1);
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}
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#ifdef NO_BASE64
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warnx("%s: base64 decoding is not supported", inputname);
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return (1);
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#else
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n = b64_pton(inbuf, outbuf, sizeof(outbuf));
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#endif
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if (n < 0)
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break;
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fwrite(outbuf, 1, n, stdout);
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}
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return (checkend(inbuf, "====",
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"error decoding base64 input stream"));
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}
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static void
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usage(void)
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{
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(void)fprintf(stderr,
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"usage: %s [-m] [-p | -o outfile] [encoded-file ...]\n",
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getprogname());
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exit(1);
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}
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