Usenet 1993 July/InfoMagic USENET CD-ROM July 1993.ISO/sources/unix/volume7/uuencode

Internet Message Format | 1986-11-30 | 9.4 KB

Subject:  v07i015:  Uuencode and uudecode
Newsgroups: mod.sources
Approved: mirror!rs

Submitted by: Mark Horton <cbosgd!mark>
Mod.sources: Volume 7, Issue 15
Archive-name: uuencode

[  These programs have been part of the Berkeley distributions for
   quite some time.  Although they have always been in the public
   domain, they have not always been readily available.  I wrote
   the Makefile, and repacked what Mark sent me to include it.
   --r$  ]

#!/bin/sh
# This is a shell archive.  Remove anything before this line,
# then unpack it by saving it in a file and typing "sh file".

# Exit status; set to 1 on "wc" errors or if would overwrite.
STATUS=0
# Contents:  Makefile uuencode.1 uudecode.c uuencode.c

echo x - Makefile
if test -f Makefile ; then
    echo Makefile exists, putting output in $$Makefile
    OUT=$$Makefile
    STATUS=1
else
    OUT=Makefile
fi
sed 's/^XX//' > $OUT <<'@//E*O*F Makefile//'
XXCFLAGS    = -O

XXall:    uuencode uudecode
XXinstall:    all
XX    cp uuencode uudecode /usr/bin
XX    strip /usr/bin/uuencode
XX    strip /usr/bin/uudecode
XX    cp uuencode.1 /usr/man/man1/uuencode.1

XXuuencode:    uuencode.c    ;    cc -o $@ $(CFLAGS) $?
XXuudecode:    uudecode.c    ;    cc -o $@ $(CFLAGS) $?
@//E*O*F Makefile//
chmod u=rw,g=rw,o=rw $OUT

echo x - uuencode.1
if test -f uuencode.1 ; then
    echo uuencode.1 exists, putting output in $$uuencode.1
    OUT=$$uuencode.1
    STATUS=1
else
    OUT=uuencode.1
fi
sed 's/^XX//' > $OUT <<'@//E*O*F uuencode.1//'
XX.TH UUENCODE 1 "1 June 1980"
XX.UC 4
XX.SH NAME
XXuuencode,uudecode \- encode/decode a binary file for transmission via mail
XX.SH SYNOPSIS
XX.B uuencode
XX[ source ] remotedest |
XX.B mail
XXsys1!sys2!..!decode
XX.br
XX.B uudecode
XX[ file ]
XX.SH DESCRIPTION
XX.I Uuencode
XXand
XX.I uudecode
XXare used to send a binary file via uucp (or other) mail.
XXThis combination can be used over indirect mail links
XXeven when
XX.IR uusend (1C)
XXis not available.
XX.PP
XX.I Uuencode
XXtakes the named source file (default standard input) and
XXproduces an encoded version on the standard output.
XXThe encoding uses only printing ASCII characters,
XXand includes the mode of the file and the
XX.I remotedest
XXfor recreation on the remote system.
XX.PP
XX.I Uudecode
XXreads an encoded file,
XXstrips off any leading and trailing lines added by mailers,
XXand recreates the original file with the specified mode and name.
XX.PP
XXThe intent is that all mail to the user ``decode'' should be filtered
XXthrough the uudecode program.  This way the file is created automatically
XXwithout human intervention.
XXThis is possible on the uucp network by either using
XX.I sendmail
XXor by making
XX.I rmail
XXbe a link to
XX.I Mail
XXinstead of
XX.I mail.
XXIn each case, an alias must be created in a master file to get
XXthe automatic invocation of uudecode.
XX.PP
XXIf these facilities are not available, the file can be sent to a
XXuser on the remote machine who can uudecode it manually.
XX.PP
XXThe encode file has an ordinary text form and can be edited
XXby any text editor to change the mode or remote name.
XX.SH SEE\ ALSO
XXuuencode(5), uusend(1C), uucp(1C), uux(1C), mail(1)
XX.SH AUTHOR
XXMark Horton
XX.SH BUGS
XXThe file is expanded by 35% (3 bytes become 4 plus control information)
XXcausing it to take longer to transmit.
XX.PP
XXThe user on the remote system who is invoking
XX.I uudecode
XX(often
XX.I uucp)
XXmust have write permission on the specified file.
@//E*O*F uuencode.1//
chmod u=rw,g=r,o=r $OUT

echo x - uudecode.c
if test -f uudecode.c ; then
    echo uudecode.c exists, putting output in $$uudecode.c
    OUT=$$uudecode.c
    STATUS=1
else
    OUT=uudecode.c
fi
sed 's/^XX//' > $OUT <<'@//E*O*F uudecode.c//'
XX/*
XX * uudecode [input]
XX *
XX * create the specified file, decoding as you go.
XX * used with uuencode.
XX */
XX#include <stdio.h>
XX#include <pwd.h>
XX#include <sys/types.h>
XX#include <sys/stat.h>

XX/* single character decode */
XX#define DEC(c)    (((c) - ' ') & 077)

XXmain(argc, argv)
XXchar **argv;
XX{
XX    FILE *in, *out;
XX    struct stat sbuf;
XX    int mode;
XX    char dest[128];
XX    char buf[80];

XX    /* optional input arg */
XX    if (argc > 1) {
XX        if ((in = fopen(argv[1], "r")) == NULL) {
XX            perror(argv[1]);
XX            exit(1);
XX        }
XX        argv++; argc--;
XX    } else
XX        in = stdin;

XX    if (argc != 1) {
XX        printf("Usage: uudecode [infile]\n");
XX        exit(2);
XX    }

XX    /* search for header line */
XX    for (;;) {
XX        if (fgets(buf, sizeof buf, in) == NULL) {
XX            fprintf(stderr, "No begin line\n");
XX            exit(3);
XX        }
XX        if (strncmp(buf, "begin ", 6) == 0)
XX            break;
XX    }
XX    sscanf(buf, "begin %o %s", &mode, dest);

XX    /* handle ~user/file format */
XX    if (dest[0] == '~') {
XX        char *sl;
XX        struct passwd *getpwnam();
XX        char *index();
XX        struct passwd *user;
XX        char dnbuf[100];

XX        sl = index(dest, '/');
XX        if (sl == NULL) {
XX            fprintf(stderr, "Illegal ~user\n");
XX            exit(3);
XX        }
XX        *sl++ = 0;
XX        user = getpwnam(dest+1);
XX        if (user == NULL) {
XX            fprintf(stderr, "No such user as %s\n", dest);
XX            exit(4);
XX        }
XX        strcpy(dnbuf, user->pw_dir);
XX        strcat(dnbuf, "/");
XX        strcat(dnbuf, sl);
XX        strcpy(dest, dnbuf);
XX    }

XX    /* create output file */
XX    out = fopen(dest, "w");
XX    if (out == NULL) {
XX        perror(dest);
XX        exit(4);
XX    }
XX    chmod(dest, mode);

XX    decode(in, out);

XX    if (fgets(buf, sizeof buf, in) == NULL || strcmp(buf, "end\n")) {
XX        fprintf(stderr, "No end line\n");
XX        exit(5);
XX    }
XX    exit(0);
XX}

XX/*
XX * copy from in to out, decoding as you go along.
XX */
XXdecode(in, out)
XXFILE *in;
XXFILE *out;
XX{
XX    char buf[80];
XX    char *bp;
XX    int n;

XX    for (;;) {
XX        /* for each input line */
XX        if (fgets(buf, sizeof buf, in) == NULL) {
XX            printf("Short file\n");
XX            exit(10);
XX        }
XX        n = DEC(buf[0]);
XX        if (n <= 0)
XX            break;

XX        bp = &buf[1];
XX        while (n > 0) {
XX            outdec(bp, out, n);
XX            bp += 4;
XX            n -= 3;
XX        }
XX    }
XX}

XX/*
XX * output a group of 3 bytes (4 input characters).
XX * the input chars are pointed to by p, they are to
XX * be output to file f.  n is used to tell us not to
XX * output all of them at the end of the file.
XX */
XXoutdec(p, f, n)
XXchar *p;
XXFILE *f;
XX{
XX    int c1, c2, c3;

XX    c1 = DEC(*p) << 2 | DEC(p[1]) >> 4;
XX    c2 = DEC(p[1]) << 4 | DEC(p[2]) >> 2;
XX    c3 = DEC(p[2]) << 6 | DEC(p[3]);
XX    if (n >= 1)
XX        putc(c1, f);
XX    if (n >= 2)
XX        putc(c2, f);
XX    if (n >= 3)
XX        putc(c3, f);
XX}


XX/* fr: like read but stdio */
XXint
XXfr(fd, buf, cnt)
XXFILE *fd;
XXchar *buf;
XXint cnt;
XX{
XX    int c, i;

XX    for (i=0; i<cnt; i++) {
XX        c = getc(fd);
XX        if (c == EOF)
XX            return(i);
XX        buf[i] = c;
XX    }
XX    return (cnt);
XX}

XX/*
XX * Return the ptr in sp at which the character c appears;
XX * NULL if not found
XX */

XX#define    NULL    0

XXchar *
XXindex(sp, c)
XXregister char *sp, c;
XX{
XX    do {
XX        if (*sp == c)
XX            return(sp);
XX    } while (*sp++);
XX    return(NULL);
XX}
@//E*O*F uudecode.c//
chmod u=rw,g=r,o=r $OUT

echo x - uuencode.c
if test -f uuencode.c ; then
    echo uuencode.c exists, putting output in $$uuencode.c
    OUT=$$uuencode.c
    STATUS=1
else
    OUT=uuencode.c
fi
sed 's/^XX//' > $OUT <<'@//E*O*F uuencode.c//'
XX/*
XX * uuencode [input] output
XX *
XX * Encode a file so it can be mailed to a remote system.
XX */
XX#include <stdio.h>
XX#include <sys/types.h>
XX#include <sys/stat.h>

XX/* ENC is the basic 1 character encoding function to make a char printing */
XX#define ENC(c) (((c) & 077) + ' ')

XXmain(argc, argv)
XXchar **argv;
XX{
XX    FILE *in;
XX    struct stat sbuf;
XX    int mode;

XX    /* optional 1st argument */
XX    if (argc > 2) {
XX        if ((in = fopen(argv[1], "r")) == NULL) {
XX            perror(argv[1]);
XX            exit(1);
XX        }
XX        argv++; argc--;
XX    } else
XX        in = stdin;

XX    if (argc != 2) {
XX        printf("Usage: uuencode [infile] remotefile\n");
XX        exit(2);
XX    }

XX    /* figure out the input file mode */
XX    fstat(fileno(in), &sbuf);
XX    mode = sbuf.st_mode & 0777;
XX    printf("begin %o %s\n", mode, argv[1]);

XX    encode(in, stdout);

XX    printf("end\n");
XX    exit(0);
XX}

XX/*
XX * copy from in to out, encoding as you go along.
XX */
XXencode(in, out)
XXFILE *in;
XXFILE *out;
XX{
XX    char buf[80];
XX    int i, n;

XX    for (;;) {
XX        /* 1 (up to) 45 character line */
XX        n = fr(in, buf, 45);
XX        putc(ENC(n), out);

XX        for (i=0; i<n; i += 3)
XX            outdec(&buf[i], out);

XX        putc('\n', out);
XX        if (n <= 0)
XX            break;
XX    }
XX}

XX/*
XX * output one group of 3 bytes, pointed at by p, on file f.
XX */
XXoutdec(p, f)
XXchar *p;
XXFILE *f;
XX{
XX    int c1, c2, c3, c4;

XX    c1 = *p >> 2;
XX    c2 = (*p << 4) & 060 | (p[1] >> 4) & 017;
XX    c3 = (p[1] << 2) & 074 | (p[2] >> 6) & 03;
XX    c4 = p[2] & 077;
XX    putc(ENC(c1), f);
XX    putc(ENC(c2), f);
XX    putc(ENC(c3), f);
XX    putc(ENC(c4), f);
XX}

XX/* fr: like read but stdio */
XXint
XXfr(fd, buf, cnt)
XXFILE *fd;
XXchar *buf;
XXint cnt;
XX{
XX    int c, i;

XX    for (i=0; i<cnt; i++) {
XX        c = getc(fd);
XX        if (c == EOF)
XX            return(i);
XX        buf[i] = c;
XX    }
XX    return (cnt);
XX}
@//E*O*F uuencode.c//
chmod u=rw,g=r,o=r $OUT

echo Inspecting for damage in transit...
temp=/tmp/sharin$$; dtemp=/tmp/sharout$$
trap "rm -f $temp $dtemp; exit" 0 1 2 3 15
cat > $temp <<\!!!
      11      35     261 Makefile
      67     325    1839 uuencode.1
     180     502    2865 uudecode.c
     105     299    1623 uuencode.c
     363    1161    6588 total
!!!
wc  Makefile uuencode.1 uudecode.c uuencode.c | sed 's=[^ ]*/==' | diff -b $temp - >$dtemp
if test -s $dtemp ; then
    echo "Ouch [diff of wc output]:"
    cat $dtemp
    STATUS=1
elif test $STATUS = 0 ; then
    echo "No problems found."
else
    echo "WARNING -- PROBLEMS WERE FOUND..."
fi
exit $STATUS