cmdline.c

给出了 zip 压缩算法的完整实现过程。

/*
  Copyright (c) 1990-2006 Info-ZIP.  All rights reserved.

  See the accompanying file LICENSE, version 2005-Feb-10 or later
  (the contents of which are also included in zip.h) for terms of use.
  If, for some reason, all these files are missing, the Info-ZIP license
  also may be found at:  ftp://ftp.info-zip.org/pub/infozip/license.html
*/
#define module_name VMS_ZIP_CMDLINE
#define module_ident "02-006"
/*
**
**  Facility:   ZIP
**
**  Module:     VMS_ZIP_CMDLINE
**
**  Author:     Hunter Goatley <[e-mail]>
**
**  Date:       July 30, 1993
**
**  Abstract:   Routines to handle a VMS CLI interface for Zip.  The CLI
**              command line is parsed and a new argc/argv are built and
**              returned to Zip.
**
**  Modified by:
**
**      02-006          Onno van der Linden,
**                      Christian Spieler       07-JUL-1998 23:03
**              Support GNU CC 2.8 on Alpha AXP (vers-num unchanged).
**      02-006          Johnny Lee              25-JUN-1998 07:40
**              Fixed typo (superfluous ';') (vers-num unchanged).
**      02-006          Christian Spieler       12-SEP-1997 23:17
**              Fixed bugs in /BEFORE and /SINCE handlers (vers-num unchanged).
**      02-006          Christian Spieler       12-JUL-1997 02:05
**              Complete revision of the argv strings construction.
**              Added handling of "-P pwd", "-R", "-i@file", "-x@file" options.
**      02-005          Patrick Ellis           09-MAY-1996 22:25
**              Show UNIX style help screen when UNIX style options are used.
**      02-004          Onno van der Linden,
**                      Christian Spieler       13-APR-1996 20:05
**              Removed /ENCRYPT=VERIFY ("-ee" option).
**      02-003          Christian Spieler       11-FEB-1996 23:05
**              Added handling of /EXTRAFIELDS qualifier ("-X" option).
**      02-002          Christian Spieler       09-JAN-1996 22:25
**              Added "#include crypt.h", corrected typo.
**      02-001          Christian Spieler       04-DEC-1995 16:00
**              Fixed compilation in DEC CC's ANSI mode.
**      02-000          Christian Spieler       10-OCT-1995 17:54
**              Modified for Zip v2.1, added several new options.
**      01-000          Hunter Goatley          30-JUL-1993 07:54
**              Original version (for Zip v1.9p1).
**
*/


#if defined(__DECC) || defined(__GNUC__)
#pragma module module_name module_ident
#else
#module module_name module_ident
#endif

#include "zip.h"
#ifndef TEST
#include "crypt.h"      /* for VMSCLI_help() */
#include "revision.h"   /* for VMSCLI_help() */
#endif /* !TEST */

#include <ssdef.h>
#include <descrip.h>
#include <climsgdef.h>
#include <clidef.h>
#include <lib$routines.h>
#include <ots$routines.h>
#include <str$routines.h>

#ifndef CLI$_COMMA
globalvalue CLI$_COMMA;
#endif

/*
**  "Macro" to initialize a dynamic string descriptor.
*/
#define init_dyndesc(dsc) {\
        dsc.dsc$w_length = 0;\
        dsc.dsc$b_dtype = DSC$K_DTYPE_T;\
        dsc.dsc$b_class = DSC$K_CLASS_D;\
        dsc.dsc$a_pointer = NULL;}

/*
**  Memory allocation step for argv string buffer.
*/
#define ARGBSIZE_UNIT 256

/*
**  Memory reallocation macro for argv string buffer.
*/
#define CHECK_BUFFER_ALLOCATION(buf, reserved, requested) { \
    if ((requested) > (reserved)) { \
        char *save_buf = (buf); \
        (reserved) += ARGBSIZE_UNIT; \
        if (((buf) = (char *) realloc((buf), (reserved))) == NULL) { \
            if (save_buf != NULL) free(save_buf); \
            return (SS$_INSFMEM); \
        } \
    } \
}

/*
**  Define descriptors for all of the CLI parameters and qualifiers.
*/
$DESCRIPTOR(cli_delete,         "DELETE");              /* -d */
$DESCRIPTOR(cli_freshen,        "FRESHEN");             /* -f */
$DESCRIPTOR(cli_move,           "MOVE");                /* -m */
$DESCRIPTOR(cli_update,         "UPDATE");              /* -u */
$DESCRIPTOR(cli_exclude,        "EXCLUDE");             /* -x */
$DESCRIPTOR(cli_include,        "INCLUDE");             /* -i */
$DESCRIPTOR(cli_exlist,         "EXLIST");              /* -x@ */
$DESCRIPTOR(cli_inlist,         "INLIST");              /* -i@ */
$DESCRIPTOR(cli_adjust,         "ADJUST_OFFSETS");      /* -A */
$DESCRIPTOR(cli_append,         "APPEND");              /* -g */
$DESCRIPTOR(cli_batch,          "BATCH");               /* -@ */
$DESCRIPTOR(cli_before,         "BEFORE");              /* -tt */
$DESCRIPTOR(cli_comments,       "COMMENTS");            /* -c,-z */
$DESCRIPTOR(cli_comment_zipfile,"COMMENTS.ZIP_FILE");   /* -z */
$DESCRIPTOR(cli_comment_files,  "COMMENTS.FILES");      /* -c */
$DESCRIPTOR(cli_dirnames,       "DIRNAMES");            /* -D */
$DESCRIPTOR(cli_encrypt,        "ENCRYPT");             /* -e,-P */
$DESCRIPTOR(cli_extra_fields,   "EXTRA_FIELDS");        /* -X */
$DESCRIPTOR(cli_fix_archive,    "FIX_ARCHIVE");         /* -F[F] */
$DESCRIPTOR(cli_fix_normal,     "FIX_ARCHIVE.NORMAL");  /* -F */
$DESCRIPTOR(cli_fix_full,       "FIX_ARCHIVE.FULL");    /* -FF */
$DESCRIPTOR(cli_full_path,      "FULL_PATH");           /* -p */
$DESCRIPTOR(cli_help,           "HELP");                /* -h */
$DESCRIPTOR(cli_junk,           "JUNK");                /* -j */
$DESCRIPTOR(cli_keep_version,   "KEEP_VERSION");        /* -w */
$DESCRIPTOR(cli_latest,         "LATEST");              /* -o */
$DESCRIPTOR(cli_level,          "LEVEL");               /* -[0-9] */
$DESCRIPTOR(cli_license,        "LICENSE");             /* -L */
$DESCRIPTOR(cli_must_match,     "MUST_MATCH");          /* -MM */
$DESCRIPTOR(cli_pkzip,          "PKZIP");               /* -k */
$DESCRIPTOR(cli_quiet,          "QUIET");               /* -q */
$DESCRIPTOR(cli_recurse,        "RECURSE");             /* -r,-R */
$DESCRIPTOR(cli_recurse_path,   "RECURSE.PATH");        /* -r */
$DESCRIPTOR(cli_recurse_fnames, "RECURSE.FILENAMES");   /* -R */
$DESCRIPTOR(cli_since,          "SINCE");               /* -t */
$DESCRIPTOR(cli_store_types,    "STORE_TYPES");         /* -n */
$DESCRIPTOR(cli_temp_path,      "TEMP_PATH");           /* -b */
$DESCRIPTOR(cli_test,           "TEST");                /* -T */
$DESCRIPTOR(cli_translate_eol,  "TRANSLATE_EOL");       /* -l[l] */
$DESCRIPTOR(cli_transl_eol_lf,  "TRANSLATE_EOL.LF");    /* -l */
$DESCRIPTOR(cli_transl_eol_crlf,"TRANSLATE_EOL.CRLF");  /* -ll */
$DESCRIPTOR(cli_unsfx,          "UNSFX");               /* -J */
$DESCRIPTOR(cli_verbose,        "VERBOSE");             /* -v (?) */
$DESCRIPTOR(cli_verbose_normal, "VERBOSE.NORMAL");      /* -v */
$DESCRIPTOR(cli_verbose_more,   "VERBOSE.MORE");        /* -vv */
$DESCRIPTOR(cli_verbose_debug,  "VERBOSE.DEBUG");       /* -vvv */
$DESCRIPTOR(cli_verbose_command,"VERBOSE.COMMAND");     /* (none) */
$DESCRIPTOR(cli_vms,            "VMS");                 /* -V */
$DESCRIPTOR(cli_vms_all,        "VMS.ALL");             /* -VV */

$DESCRIPTOR(cli_yyz,            "YYZ_ZIP");

$DESCRIPTOR(cli_zipfile,        "ZIPFILE");
$DESCRIPTOR(cli_infile,         "INFILE");
$DESCRIPTOR(zip_command,        "zip ");

static int show_VMSCLI_help;

#if !defined(zip_clitable)
#  define zip_clitable ZIP_CLITABLE
#endif
#if defined(__DECC) || defined(__GNUC__)
extern void *zip_clitable;
#else
globalref void *zip_clitable;
#endif

/* extern unsigned long LIB$GET_INPUT(void), LIB$SIG_TO_RET(void); */

#ifndef __STARLET_LOADED
#ifndef sys$bintim
#  define sys$bintim SYS$BINTIM
#endif
#ifndef sys$numtim
#  define sys$numtim SYS$NUMTIM
#endif
extern int sys$bintim ();
extern int sys$numtim ();
#endif /* !__STARLET_LOADED */
#ifndef cli$dcl_parse
#  define cli$dcl_parse CLI$DCL_PARSE
#endif
#ifndef cli$present
#  define cli$present CLI$PRESENT
#endif
#ifndef cli$get_value
#  define cli$get_value CLI$GET_VALUE
#endif
extern unsigned long cli$dcl_parse ();
extern unsigned long cli$present ();
extern unsigned long cli$get_value ();

unsigned long vms_zip_cmdline (int *, char ***);
static unsigned long get_list (struct dsc$descriptor_s *,
                               struct dsc$descriptor_d *, int,
                               char **, unsigned long *, unsigned long *);
static unsigned long get_time (struct dsc$descriptor_s *qual, char *timearg);
static unsigned long check_cli (struct dsc$descriptor_s *);
static int verbose_command = 0;


#ifdef TEST
int
main(int argc, char **argv)
{
    return (vms_zip_cmdline(&argc, &argv));
}
#endif /* TEST */


unsigned long
vms_zip_cmdline (int *argc_p, char ***argv_p)
{
/*
**  Routine:    vms_zip_cmdline
**
**  Function:
**
**      Parse the DCL command line and create a fake argv array to be
**      handed off to Zip.
**
**      NOTE: the argv[] is built as we go, so all the parameters are
**      checked in the appropriate order!!
**
**  Formal parameters:
**
**      argc_p          - Address of int to receive the new argc
**      argv_p          - Address of char ** to receive the argv address
**
**  Calling sequence:
**
**      status = vms_zip_cmdline (&argc, &argv);
**
**  Returns:
**
**      SS$_NORMAL      - Success.
**      SS$_INSFMEM     - A malloc() or realloc() failed
**      SS$_ABORT       - Bad time value
**
*/
    register unsigned long status;
    char options[48];
    char *the_cmd_line;                 /* buffer for argv strings */
    unsigned long cmdl_size;            /* allocated size of buffer */
    unsigned long cmdl_len;             /* used size of buffer */
    char *ptr;
    int  x, len;

    int new_argc;
    char **new_argv;

    struct dsc$descriptor_d work_str;
    struct dsc$descriptor_d foreign_cmdline;

    init_dyndesc(work_str);
    init_dyndesc(foreign_cmdline);

    /*
    **  See if the program was invoked by the CLI (SET COMMAND) or by
    **  a foreign command definition.  Check for /YYZ_ZIP, which is a
    **  valid default qualifier solely for this test.
    */
    show_VMSCLI_help = TRUE;
    status = check_cli(&cli_yyz);
    if (!(status & 1)) {
        lib$get_foreign(&foreign_cmdline);
        /*
        **  If nothing was returned or the first character is a "-", then
        **  assume it's a UNIX-style command and return.
        */
        if (foreign_cmdline.dsc$w_length == 0)
            return (SS$_NORMAL);
        if ((*(foreign_cmdline.dsc$a_pointer) == '-') ||
            ((foreign_cmdline.dsc$w_length > 1) &&
             (*(foreign_cmdline.dsc$a_pointer) == '"') &&
             (*(foreign_cmdline.dsc$a_pointer + 1) == '-'))) {
            show_VMSCLI_help = FALSE;
            return (SS$_NORMAL);
        }

        str$concat(&work_str, &zip_command, &foreign_cmdline);
        status = cli$dcl_parse(&work_str, &zip_clitable, lib$get_input,
                        lib$get_input, 0);
        if (!(status & 1)) return (status);
    }

    /*
    **  There's always going to be a new_argv[] because of the image name.
    */
    if ((the_cmd_line = (char *) malloc(cmdl_size = ARGBSIZE_UNIT)) == NULL)
        return (SS$_INSFMEM);

    strcpy(the_cmd_line, "zip");
    cmdl_len = sizeof("zip");

    /*
    **  First, check to see if any of the regular options were specified.
    */

    options[0] = '-';
    ptr = &options[1];          /* Point to temporary buffer */

    /*
    **  Delete the specified files from the zip file?
    */
    status = cli$present(&cli_delete);
    if (status & 1)
        *ptr++ = 'd';

    /*
    **  Freshen (only changed files).
    */
    status = cli$present(&cli_freshen);
    if (status & 1)
        *ptr++ = 'f';

    /*
    **  Delete the files once they've been added to the zip file.
    */
    status = cli$present(&cli_move);
    if (status & 1)
        *ptr++ = 'm';

    /*
    **  Add changed and new files.
    */
    status = cli$present(&cli_update);
    if (status & 1)
        *ptr++ = 'u';

    /*
    **  Check for the compression level (-0 through -9).
    */
    status = cli$present(&cli_level);
    if (status & 1) {

        unsigned long binval;

        status = cli$get_value(&cli_level, &work_str);
        status = ots$cvt_tu_l(&work_str, &binval);
        if (!(status & 1) || (binval > 9)) {
           return (SS$_ABORT);
        }