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From: swl26%CAS.BITNET@CORNELLC.cit.cornell.edu
Date: Wed, 18 Jul 1990 09:16 EDT
Subject: Re(2): diffs for mvs port of flex-2.3
In-Reply-To: Your message of Tue, 17 Jul 90 17:42:3
To: vern@cs.cornell.edu
Sorry about the trailing blank problem. It's farily common with data sent
through bitnet paths, but ever the optimist ...
>I think there should be an 'M' at the beginning of the second line.
This isn't a problem. I believe that the first byte of the line indicates
it's length (in some manner).
Rather than re-send the data, how about a uudecode that compensates for
the trailing blank problem? I manually mangled the uuencoded file and ran
the following decode, and it seemed to work.
#! /bin/sh
# This is a shell archive. Remove anything before this line, then feed it
# into a shell via "sh file" or similar. To overwrite existing files,
# type "sh file -c".
# The tool that generated this appeared in the comp.sources.unix newsgroup;
# send mail to comp-sources-unix@uunet.uu.net if you want that tool.
# If this archive is complete, you will see the following message at the end:
# "End of shell archive."
# Contents: uudecode.c
# Wrapped by swl26@swl26aws on Wed Jul 18 08:59:24 1990
PATH=/bin:/usr/bin:/usr/ucb ; export PATH
if test -f 'uudecode.c' -a "${1}" != "-c" ; then
echo shar: Will not clobber existing file \"'uudecode.c'\"
else
echo shar: Extracting \"'uudecode.c'\" \(6418 characters\)
sed "s/^X//" >'uudecode.c' <<'END_OF_FILE'
X/* #ifndef lint
Xstatic char sccsid[] = "@(#)uudecode.c 5.3-1 (Berkeley) 9/1/87";
X#endif */
X
X/* Written by Mark Horton */
X/* Modified by ajr (Alan J Rosenthatl,flaps@utcsri.UUCP) to use checksums */
X/* Modified by fnf (Fred Fish,well!fnf) to use Keith Pyle's suggestion for
X compatibility */
X/* Modified by bcn (Bryce Nesbitt,ucbvax!cogsci!bryce) to fix a misleading
X error message on the Amiga port, to fix a bug that prevented decoding
X certain files, to work even if trailing spaces have been removed from a
X file, to check the filesize (if present), to add some error checking, to
X loop for multiple decodes from a single file, and to handle common
X BITNET mangling. Also kludged around a missing string function in Aztec
X C */
X
X/*
X * uudecode [input]
X *
X * Decode a file encoded with uuencode. WIll extract multiple encoded
X * modules from a single file. Can deal with most mangled files, including
X * BITNET.
X */
X
X#include <stdio.h>
X#include <ctype.h>
X
X#ifdef AMIGA
X#define AMIGA_LATTICE /* Set for Amiga Lattice C */
X#define MCH_AMIGA
X#define MPU68000
X#endif
X
X#ifdef unix
X#include <pwd.h>
X#include <sys/types.h>
X#include <sys/stat.h>
X#endif
X
X#define SUMSIZE 64
X#define DEC(c) (((c) - ' ') & 077) /* single character decode */
X
Xmain(argc, argv)
Xchar **argv;
X{
XFILE *in, *out;
Xint through_loop=0; /* Dejavu indicator */
Xint mode; /* file's mode (from header) */
Xlong filesize; /* theoretical file size (from header) */
Xchar dest[128];
Xchar buf[80];
X
X#ifdef AMIGA_LATTICE
Xextern int Enable_Abort;
X Enable_Abort=1;
X#endif
X
X /* A filename can be specified to be uudecoded, or nothing can
X be specified, and the input will come from STDIN */
X
X switch (argc)
X {
X case 1:
X in=stdin;
X break;
X
X case 2:
X if ((in = fopen(argv[1], "r")) == NULL)
X {
X fprintf(stderr, "ERROR: can't find %s\n", argv[1]);
X fprintf(stderr, "USAGE: uudecode [infile]\n");
X exit(10);
X }
X break;
X
X default:
X fprintf(stderr, "USAGE: uudecode [infile]\n");
X exit(11);
X break;
X }
X
X /* Loop through file, searching for headers. Decode anything with a
X header, complain if there where no headers. */
X
Xfor (;;)
X{
X /* search file for header line */
X for (;;)
X {
X if (fgets(buf, sizeof buf, in) == NULL)
X {
X if (!through_loop)
X {
X fprintf(stderr, "ERROR: no `begin' line!\n");
X exit(12);
X }
X else
X {
X exit(0);
X }
X }
X if (strncmp(buf, "begin ", 6) == 0)
X break;
X }
X sscanf(buf, "begin %o %s", &mode, dest);
X
X#ifdef unix
X /* handle ~user/file format */
X if (dest[0] == '~')
X {
X char *sl;
X struct passwd *getpwnam();
X char *index();
X struct passwd *user;
X char dnbuf[100];
X
X sl = index(dest, '/');
X if (sl == NULL)
X {
X fprintf(stderr, "Illegal ~user\n");
X exit(13);
X }
X *sl++ = 0;
X user = getpwnam(dest+1);
X if (user == NULL)
X {
X fprintf(stderr, "No such user as %s\n", dest);
X exit(14);
X }
X strcpy(dnbuf, user->pw_dir);
X strcat(dnbuf, "/");
X strcat(dnbuf, sl);
X strcpy(dest, dnbuf);
X }
X#endif
X
X /* create output file */
X if ((out = fopen(dest, "w")) == NULL)
X {
X fprintf(stderr, "ERROR: can't open output file %s\n", dest);
X exit(15);
X }
X#ifdef unix
X chmod(dest, mode);
X#endif
X
X decode(in, out, dest);
X
X if (fgets(buf, sizeof buf, in) == NULL || strncmp(buf,"end",3))
X { /* don't be overly picky about newline ^ */
X fprintf(stderr, "ERROR: no `end' line\n");
X exit(16);
X }
X
X if (!(fgets(buf,sizeof buf,in) == NULL || strncmp(buf,"size ",3)))
X {
X sscanf(buf, "size %ld", &filesize);
X if (ftell(out) != filesize)
X {
X fprintf(stderr, "ERROR: file should have been %ld bytes long but was
X exit(17);
X }
X }
X through_loop = 1;
X} /* forever */
X} /* main */
X
X/*
X * Copy from in to out, decoding as you go.
X * If a return or newline is encountered too early in a line, it is
X * assumed that means that some editor has truncated trailing spaces.
X */
Xdecode(in, out, dest)
XFILE *in;
XFILE *out;
Xchar *dest;
X{
Xchar buf[81];
Xchar *bp;
Xint nosum=0;
X#ifndef unix
Xextern errno;
X#endif
Xregister int j;
Xregister int n;
Xint checksum, line;
X
X for (line = 1; ; line++) /* for each input line */
X {
X if (fgets(buf, sizeof buf, in) == NULL)
X {
X fprintf(stderr, "ERROR: input ended unexpectedly!\n");
X exit(18);
X }
X
X /* Pad end of lines in case some editor truncated trailing
X spaces */
X
X for (n=0;n<79;n++) /* search for first \r, \n or \000 */
X {
X if (buf[n]=='\176') /* If BITNET made a twiddle, */
X buf[n]='\136'; /* we make a caret */
X if (buf[n]=='\r'||buf[n]=='\n'||buf[n]=='\000')
X break;
X }
X for (;n<79;n++) /* when found, fill rest of line with space */
X {
X buf[n]=' ';
X }
X buf[79]=0; /* terminate new string */
X
X checksum = 0;
X n = DEC(buf[0]);
X if (n <= 0)
X break; /* 0 bytes on a line?? Must be the last line */
X
X bp = &buf[1];
X
X /* FOUR input characters go into each THREE output charcters */
X
X while (n >= 4)
X {
X j = DEC(bp[0]) << 2 | DEC(bp[1]) >> 4; putc(j, out); checksum += j;
X j = DEC(bp[1]) << 4 | DEC(bp[2]) >> 2; putc(j, out); checksum += j;
X j = DEC(bp[2]) << 6 | DEC(bp[3]); putc(j, out); checksum += j;
X checksum = checksum % SUMSIZE;
X bp += 4;
X n -= 3;
X }
X
X j = DEC(bp[0]) << 2 | DEC(bp[1]) >> 4;
X checksum += j;
X if (n >= 1)
X putc(j, out);
X j = DEC(bp[1]) << 4 | DEC(bp[2]) >> 2;
X checksum += j;
X if (n >= 2)
X putc(j, out);
X j = DEC(bp[2]) << 6 | DEC(bp[3]);
X checksum += j;
X if (n >= 3)
X putc(j, out);
X checksum = checksum % SUMSIZE;
X bp += 4;
X n -= 3;
X
X#ifndef unix
X /* Error checking under UNIX??? You must be kidding... */
X /* Check if an error occured while writing to that last line */
X if (errno)
X {
X fprintf(stderr, "ERROR: error writing to %s\n",dest);
X exit(19);
X }
X#endif
X
X /* The line has been decoded; now check that sum */
X
X nosum |= !isspace(*bp);
X if (nosum) /* Is there a checksum at all?? */
X {
X if (checksum != DEC(*bp)) /* Does that checksum match? */
X {
X fprintf(stderr, "ERROR: checksum mismatch decoding %s, line %d.\
X }
X } /* sum */
X } /* line */
X} /* function */
X
X#ifdef unix
X/*
X * Return the ptr in sp at which the character c appears;
X * 0 if not found
X */
Xchar *
Xindex(sp, c)
Xregister char *sp, c;
X{
X do
X {
X if (*sp == c)
X return(sp);
X }
X while (*sp++);
X
X return(0);
X}
X#endif unix
X
END_OF_FILE
echo shar: NEWLINE appended to \"'uudecode.c'\"
if test 6419 -ne `wc -c <'uudecode.c'`; then
echo shar: \"'uudecode.c'\" unpacked with wrong size!
fi
# end of 'uudecode.c'
fi
echo shar: End of shell archive.
exit 0