Il CD di internet/CD.iso/SOURCE/CONTRIB/HTTPD/HTTPD_SO.TAR/httpd_1.3/support/auth/uudecode.c

C/C++ Source or Header | 1994-01-12 | 4.8 KB | 185 lines

/*
 * Copyright (c) 1983 Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *    This product includes software developed by the University of
 *    California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef lint
static char sccsid[] = "@(#)uudecode.c    5.10 (Berkeley) 6/1/90";
#endif /* not lint */

/*
 * uudecode [file ...]
 *
 * create the specified file, decoding as you go.
 * used with uuencode.
 */
#include <sys/param.h>
#include <sys/stat.h>
#include <pwd.h>
#include <stdio.h>
#include <string.h>

char *filename;

/* ARGSUSED */
main(argc, argv)
    int argc;
    char **argv;
{
    extern int errno;
    int rval;
#if 0
    if (*++argv) {
        rval = 0;
        do {
            if (!freopen(filename = *argv, "r", stdin)) {
                (void)fprintf(stderr, "uudecode: %s: %s\n",
                    *argv, strerror(errno));
                rval = 1;
                continue;
            }
            rval |= decode();
        } while (*++argv);
    } else {
        filename = "stdin";
        rval = decode();
    }
#else
         filename = "stdin";
         rval = decode();
#endif
    exit(rval);
}

decode()
{
    extern int errno;
    struct passwd *pw;
    register int n;
    register char ch, *p;
    int mode, n1;
    char buf[MAXPATHLEN];

    /* search for header line */
    do {
        if (!fgets(buf, sizeof(buf), stdin)) {
            (void)fprintf(stderr,
                "uudecode: %s: no \"begin\" line\n", filename);
            return(1);
        }
    } while (strncmp(buf, "begin ", 6));
    (void)sscanf(buf, "begin %o %s", &mode, buf);

    /* handle ~user/file format */
    if (buf[0] == '~') {
        if (!(p = index(buf, '/'))) {
            (void)fprintf(stderr, "uudecode: %s: illegal ~user.\n",
                filename);
            return(1);
        }
        *p++ = NULL;
        if (!(pw = getpwnam(buf + 1))) {
            (void)fprintf(stderr, "uudecode: %s: no user %s.\n",
                filename, buf);
            return(1);
        }
        n = strlen(pw->pw_dir);
        n1 = strlen(p);
        if (n + n1 + 2 > MAXPATHLEN) {
            (void)fprintf(stderr, "uudecode: %s: path too long.\n",
                filename);
            return(1);
        }
        bcopy(p, buf + n + 1, n1 + 1);
        bcopy(pw->pw_dir, buf, n);
        buf[n] = '/';
    }
#if 0
    /* create output file, set mode */
    if (!freopen(buf, "w", stdout) ||
        fchmod(fileno(stdout), mode&0666)) {
        (void)fprintf(stderr, "uudecode: %s: %s: %s\n", buf,
            filename, strerror(errno));
        return(1);
    }
#endif
    /* for each input line */
    for (;;) {
        if (!fgets(p = buf, sizeof(buf), stdin)) {
            (void)fprintf(stderr, "uudecode: %s: short file.\n",
                filename);
            return(1);
        }
#define    DEC(c)    (((c) - ' ') & 077)        /* single character decode */
        /*
         * `n' is used to avoid writing out all the characters
         * at the end of the file.
         */
        if ((n = DEC(*p)) <= 0)
            break;
        for (++p; n > 0; p += 4, n -= 3)
            if (n >= 3) {
                ch = DEC(p[0]) << 2 | DEC(p[1]) >> 4;
                putchar(ch);
                ch = DEC(p[1]) << 4 | DEC(p[2]) >> 2;
                putchar(ch);
                ch = DEC(p[2]) << 6 | DEC(p[3]);
                putchar(ch);
            }
            else {
                if (n >= 1) {
                    ch = DEC(p[0]) << 2 | DEC(p[1]) >> 4;
                    putchar(ch);
                }
                if (n >= 2) {
                    ch = DEC(p[1]) << 4 | DEC(p[2]) >> 2;
                    putchar(ch);
                }
                if (n >= 3) {
                    ch = DEC(p[2]) << 6 | DEC(p[3]);
                    putchar(ch);
                }
            }
    }
    if (!fgets(buf, sizeof(buf), stdin) || strcmp(buf, "end\n")) {
        (void)fprintf(stderr, "uudecode: %s: no \"end\" line.\n",
            filename);
        return(1);
    }
    return(0);
}

usage()
{
    (void)fprintf(stderr, "usage: uudecode [file ...]\n");
    exit(1);
}