zooext.c

汇编大全 中国矿业大学计算机学院 汇编实验5

#ifndef LINT
/* derived from: zooext.c 2.21 88/08/24 02:39:04 */
/*$Source: /usr/home/dhesi/zoo/RCS/zooext.c,v $*/
/*$Id: zooext.c,v 1.9 91/07/09 01:54:13 dhesi Exp $*/
static char sccsid[]="$Source: /usr/home/dhesi/zoo/RCS/zooext.c,v $\n\
$Id: zooext.c,v 1.9 91/07/09 01:54:13 dhesi Exp $";
#endif /* LINT */

/*
Copyright (C) 1986, 1987 Rahul Dhesi -- All rights reserved
(C) Copyright 1988 Rahul Dhesi -- All rights reserved
(C) Copyright 1991 Rahul Dhesi -- All rights reserved
*/
/* Extract file from archive.  Extracts files specified in parameter-list
   from archive zoo_path.  If none specified, extracts all files from
   archive. */

#include "options.h"
#include "zoo.h"
#include "parse.h"      /* defines struct for parse() */

#include "portable.h"   /* portable I/O definitions */
#include "machine.h"    /* machine-specific declarations */

#include "zooio.h"
#include "various.h"

#ifndef NOSIGNAL
#include <signal.h>
#endif

#include "zoofns.h"

#ifdef MODE_BIN		/* will need fileno() from stdio.h */
# include <stdio.h>
#endif

void makepath PARMS((char *));
int needed PARMS((char *, struct direntry *, struct zoo_header *));
void putstr PARMS((char *));

#ifdef FATTR
int setfattr PARMS ((char *, unsigned long));
#endif /* FATTR */

extern int quiet;

#include "errors.i"

/* Following two are used by ctrl_c() also, hence declared here */
char extfname[LFNAMESIZE];             /* filename of extracted file */
char prtfname[LFNAMESIZE];             /* name of extracted file on screen */
static ZOOFILE this_file;              /* file to extract */

static int tofile;                     /* true if not pipe or null device */
extern unsigned int crccode;
extern char *out_buf_adr;              /* address of output buffer */

void zooext(zoo_path, option)
char *zoo_path, *option;
{
char *whichname;                          /* which name to extract */
char matchname[PATHSIZE];                 /* for pattern matching only */
#ifndef NOSIGNAL
T_SIGNAL (*oldsignal)();        /* to save previous SIGINT handler */
#endif
ZOOFILE zoo_file;                         /* open archive */
long next_ptr;                            /* pointer to within archive */
struct zoo_header zoo_header;             /* header for archive */
int status;                               /* error status */
int exit_status = 0;								/* exit status */
int error_message;								/* Whether to give error message */
unsigned long disk_space;                 /* disk space left */
int matched = 0;                          /* Any files matched? */
int overwrite = 0;                        /* force overwrite of files? */
int supersede = 0;								/* supersede newer files? */
int needdel = 0;                          /* extract deleted files too */
int usepath = 2;                          /* use path for extraction */
int todot = 0;                            /* extract relative to . */
int badcrc_count = 0;                     /* how many files with bad CRC */
int bad_header = 0;                       /* to avoid spurious messages later */
long fiz_ofs = 0;                         /* offset where to start */
long dat_ofs = 0;									/* .. and offset of file data */
int pipe = 0;                             /* are we piping output? */
int null_device = 0;                      /* are we sending to null device? */
#ifndef PORTABLE
int fast_ext = 0;                         /* fast extract as *.?Z? */
int alloc_size;                           /* disk allocation unit size */
#endif
struct direntry direntry;                 /* directory entry */
int first_dir = 1;								/* first dir entry seen? */

static char extract_ver[] = "Zoo %d.%d is needed to extract %s.\n";
static char no_space[] = "Insufficient disk space to extract %s.\n";

while (*option) {
   switch (*option) {
#ifndef PORTABLE
      case 'z': fast_ext++; break;
#endif
      case 'x':
      case 'e': break;
      case 'N': null_device++; break;
      case 'O': overwrite += 2; break;
      case 'o': overwrite++; break;
      case 'p': pipe++; break;
		case 'S': supersede++; break;
      case 'd': needdel++; break;
      case 'q': quiet++; break;
		case ':': usepath = 0; break;
      case '/': usepath++; break;
      case '.': todot++; break;
      case '@': 	/* if @m,n specified, fiz_ofs = m, dat_ofs = n */
			{
				char *comma_pos;
				++option;
				comma_pos = strchr(option, ',');
				if (comma_pos != NULL) {
					dat_ofs = calc_ofs (comma_pos + 1);
					*comma_pos = '\0';
				}
				fiz_ofs = calc_ofs(option); 
				goto no_more;
			}
      default:
         prterror ('f', inv_option, *option);
         /* break; */
   }
   option++;
}

no_more: /* come from exit in while loop above */


if (overwrite == 1)                 /* must be at least 2 to begin with */
   overwrite--;

if (null_device && pipe) {
   prterror ('f', inv_option, 'p');
   pipe = 0;
}

if (overwrite && pipe)
   prterror ('w', option_ignored, 'O');

#ifndef PORTABLE
if (null_device && fast_ext) {
   prterror ('w', inv_option, 'N');
   null_device = 0;
}
#endif

tofile = !pipe && !null_device;     /* sending to actual file */

zoo_file = zooopen(zoo_path, Z_READ);

if (zoo_file == NOFILE)
   prterror ('f', could_not_open, zoo_path);

if (fiz_ofs != 0L) {                /* if offset specified, start there */
	prterror ('m', start_ofs, fiz_ofs, dat_ofs);
   zooseek (zoo_file, fiz_ofs, 0);
} else {
   /* read header */
   frd_zooh (&zoo_header, zoo_file);
   if ((zoo_header.zoo_start + zoo_header.zoo_minus) != 0L) {
      prterror ('w', failed_consistency);
      bad_header++;
		exit_status = 1;
   }
   zooseek (zoo_file, zoo_header.zoo_start, 0); /* seek to where data begins */
}

#ifndef PORTABLE
disk_space = space (0, &alloc_size);         /* remember disk space left */
#else
disk_space = MAXLONG;              /* infinite disk space */
#endif

/* if piping output we open the output device just once */
if (null_device) {
   this_file = NULLFILE;
} else if (pipe)
   this_file = STDOUT;    /* standard output */

while (1) {
   frd_dir (&direntry, zoo_file);
   if (direntry.zoo_tag != ZOO_TAG) {
      long currpos, zoolength;
		prterror ('F', invalid_header);

		/* Note:  if header was bad, there's no point trying to find
			how many more bytes aren't processed -- our seek position is
			likely very wrong */

		if (!bad_header)
			if ((currpos = zootell (zoo_file)) != -1L)
				if (zooseek (zoo_file, 0L, 2) != -1)
					if ((zoolength = zootell (zoo_file)) != -1L)
						printf (cant_process, zoolength - currpos);              
		zooexit (1);
   }
   if (direntry.next == 0L) {                /* END OF CHAIN */
      break;                                 /* EXIT on end of chain */
   }
	/* when first direntry read, change dat_ofs from abs. pos. to rel. offset */
	if (first_dir && dat_ofs != 0) {
		dat_ofs -= direntry.offset;
		first_dir = 0;
	}
   next_ptr = direntry.next + dat_ofs;       /* ptr to next dir entry */

   whichname = choosefname(&direntry);       /* which filename */
	whichname = str_dup(whichname);				/* bug fix */
   fixfname(whichname);                      /* fix syntax */
	strcpy (matchname, fullpath (&direntry));	/* get full pathname */
	if (zoo_header.vdata & VFL_ON)
		add_version (matchname, &direntry);		/* add version suffix */

/* if extraction to subtree rooted at curr dir, modify pathname */
#if 0
#ifdef DIR_LBRACK
   if (todot && direntry.dirname[0] == *DIR_LBRACK &&
                direntry.dirname[1] != *CUR_DIR)      {
      char tmpstr[PATHSIZE];
      strcpy (tmpstr, DIR_LBRACK);
      strcat (tmpstr, CUR_DIR);
      strcat (tmpstr, &direntry.dirname[1]);
      strcpy (direntry.dirname, tmpstr);
   }
#endif
#endif

   /* hard-coded '/' should be eventually removed */
   if (todot && *direntry.dirname == '/') { 
      char tmpstr[PATHSIZE];
      strcpy(tmpstr, direntry.dirname);
      strcpy(direntry.dirname,CUR_DIR);
      strcat(direntry.dirname, tmpstr);
   }

   /* matchname now holds the full pathname for pattern matching */

   if ( ( (needdel && direntry.deleted) ||
            (needdel < 2 && !direntry.deleted)
        ) && needed(matchname, &direntry, &zoo_header)) {
      matched++;           /* update count of files extracted */

      if (direntry.major_ver > MAJOR_LZH_VER ||
         (direntry.major_ver == MAJOR_LZH_VER && 
            direntry.minor_ver > MINOR_LZH_VER)) {
            prterror ('e', extract_ver, direntry.major_ver, 
                           direntry.minor_ver, whichname);
				exit_status = 1;
            goto loop_again;
      }

      /* 
      If extracting to null device, or if user requested extraction
      of entire path, include any directory name in filename.
      If extraction to current directory requested, and if extfname
      begins with path separator, fix it */

      strcpy (extfname, whichname);
      if ((usepath || null_device) && direntry.dirlen != 0) {
         combine(extfname, direntry.dirname, whichname);
         if (usepath > 1 && !null_device)
            makepath(direntry.dirname);         /* make dir prefix */
      }

		strcpy(prtfname, extfname);
		if (zoo_header.vdata & VFL_ON)
			add_version (prtfname, &direntry);

      if (tofile) {
         int present = 0;

#ifndef PORTABLE
         /* 
         if Z format (fast) extraction, extension is created as
         follows:  for no current extension, new extension is "zzz";
         for current extension "a", new extension is "azz";  for 
         current extension "ab", new extension is "azb";  and for
         current extension "abc", new extension is "azc".
         */
           
         if (fast_ext) {
            int length;
            struct path_st path_st;
            parse (&path_st, extfname);         /* split filename */
            strcpy (extfname, path_st.fname);   /* just root filename */
            length = strlen (path_st.ext);
            strcat (extfname, ".");
            if (length == 0)
               strcat (extfname, "zzz");        /* no ext -> .zzz */
            else if (length == 1) {
               strcat (extfname, path_st.ext);
               strcat (extfname, "zz");         /* *.?    -> *.?zz */
            } else { /* length is 2 or 3 */
               if (length == 2)                 /* allow .aa, .ab, etc. */
                  path_st.ext[2] = path_st.ext[1];
               path_st.ext[1] = 'z';
               strcat (extfname, path_st.ext);  /* *.??   -> *.?z? */
            }
				strcpy(prtfname, direntry.fname);
				add_version (prtfname, &direntry);
         }
#endif   /* ifndef PORTABLE */

			/* don't extract if archived file is older than disk copy */
			if (!supersede && exists(extfname)) {
				unsigned int ddate, dtime;
#ifdef GETUTIME
				getutime (extfname, &ddate, &dtime);
#else
				ZOOFILE tfile;
				ddate = dtime = 0xffff;					/* assume maximum */
				tfile = zooopen(extfname, Z_READ);
				if (tfile == NOFILE)
					goto loop_again;
				gettime (tfile, &ddate, &dtime);
				zooclose (tfile);
#endif
				if (cmpnum (direntry.date, direntry.time, ddate, dtime) <= 0) {
					prterror ('m', "%-14s -- skipped\n", prtfname);
					goto loop_again;
				}
			}

         if (overwrite) {