mvs.uudecode

Flex词法/语法分析器源码

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From: [e-mail]
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: [e-mail]

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 [e-mail] 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,[e-mail]) 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