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UNZIP52.ZIP
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filedate.c
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C/C++ Source or Header
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1996-04-25
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16KB
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469 lines
/* Low-level Amiga routines shared between Zip and UnZip.
*
* Contains: FileDate()
* tzset() [replaces bad C library versions]
* gmtime() [ditto]
* localtime() [ditto]
* time() [ditto]
* sendpkt()
* Agetch()
*
* The first two are used by all Info-Zip programs except fUnZip. The last two
* are used by all except the non-CRYPT version of fUnZip. Probably some of
* the stuff in here is unused by ZipNote and ZipSplit too... sendpkt() is
* used by Agetch() and FileDate(), and by windowheight() in amiga/amiga.c
* (UnZip).
*/
/* HISTORY/CHANGES
* 2 Sep 92, Greg Roelofs, Original coding.
* 6 Sep 92, John Bush, Incorporated into UnZip 5.1
* 6 Sep 92, John Bush, Interlude "FileDate()" defined, which calls or
* redefines SetFileDate() depending upon AMIGADOS2 definition.
* 11 Oct 92, John Bush, Eliminated AMIGADOS2 switch by determining
* revision via OpenLibrary() call. Now only one version of
* the program runs on both platforms (1.3.x vs. 2.x)
* 11 Oct 92, John Bush, Merged with Zip version and changed arg passing
* to take time_t input instead of struct DateStamp.
* Arg passing made to conform with utime().
* 22 Nov 92, Paul Kienitz, fixed includes for Aztec and cleaned up some
* lint-ish errors; simplified test for AmigaDOS version.
* 11 Nov 95, Paul Kienitz, added Agetch() for crypt password input and
* UnZip's "More" prompt -- simplifies crypt.h and avoids
* use of library code redundant with sendpkt(). Made it
* available to FUnZip, which does not use FileDate().
* 22 Nov 95, Paul Kienitz, created a new tzset() that gets the current
* timezone from the Locale preferences. These exist only under
* AmigaDOS 2.1 and up, but it is probably correctly set on more
* Amigas than the TZ environment variable is. We check that
* only if TZ is not validly set. We do not parse daylight
* savings syntax except to check for presence vs. absence of a
* DST part; United States rules are assumed. This is better
* than the tzset()s in the Amiga compilers' libraries do.
* 15 Jan 96, Chr. Spieler, corrected the logic when to select low level
* sendpkt() (when FileDate(), Agetch() or windowheight() is used),
* and AMIGA's Agetch() (CRYPT, and UnZip(SFX)'s UzpMorePause()).
* 10 Feb 96, Paul Kienitz, re-fiddled that selection logic again, moved
* stuff around for clarity.
* 16 Mar 96, Paul Kienitz, created a replacement localtime() to go with the
* new tzset(), because Aztec's is hopelessly broken. Also
* gmtime(), which localtime() calls.
* 12 Apr 96, Paul Kienitz, daylight savings was being handled incorrectly.
* 21 Apr 96, Paul Kienitz, had to replace time() as well, Aztec's returns
* local time instead of GMT. That's why their localtime() was bad,
* because it assumed time_t was already local, and gmtime() was
* the one that checked TZ.
* 23 Apr 96, Chr. Spieler, deactivated time() replacement for UnZip stuff.
* Currently, the UnZip sources do not make use of time() (and do
* not supply the working mktime() replacement, either!).
*/
#include <ctype.h>
#include <string.h>
#include <time.h>
#include <errno.h>
#include <stdio.h>
#include <exec/types.h>
#include <exec/memory.h>
#include <exec/libraries.h>
#include <libraries/dos.h>
#include <libraries/dosextens.h>
#include <clib/exec_protos.h>
#include <clib/dos_protos.h>
#include <clib/locale_protos.h>
#ifdef AZTEC_C
# include <pragmas/exec_lib.h>
# include <pragmas/dos_lib.h>
# include <pragmas/locale_lib.h>
# define ESRCH ENOENT
# define EOSERR EIO
#endif
#if defined(LATTICE) || defined(__SASC)
# include <proto/exec.h>
# include <proto/dos.h>
#endif
#define OF(x) x /* so crypt.h prototypes compile okay */
#if defined(ZIP) || defined(FUNZIP)
# define near /* likewise */
typedef unsigned long ulg; /* likewise */
typedef size_t extent; /* likewise */
typedef void zvoid; /* likewise */
#endif
#include "crypt.h" /* just so we can tell if CRYPT is defined */
#ifndef FUNZIP
/***********************/
/* Function filedate() */
/***********************/
/* FileDate() (originally utime.c), by Paul Wells. Modified by John Bush
* and others (see also sendpkt() comments, below); NewtWare SetFileDate()
* clone cheaply ripped off from utime().
*/
/* DESCRIPTION
* This routine chooses between 2 methods to set the file date on AMIGA.
* Since AmigaDOS 2.x came out, SetFileDate() was available in ROM (v.36
* and higher). Under AmigaDOS 1.3.x (less than v.36 ROM), SetFileDate()
* must be accomplished by constructing a message packet and sending it
* to the file system handler of the file to be stamped.
*
* The system's ROM version is extracted from the external system Library
* base.
*
* NOTE: although argument passing conforms with utime(), note the
* following differences:
* - Return value is boolean success/failure.
* - If a structure or array is passed, only the first value
* is used, which *may* correspond to date accessed and not
* date modified.
*/
# ifndef SUCCESS
# define SUCCESS (-1L)
# define FAILURE 0L
# endif
# define ReqVers 36L /* required library version for SetFileDate() */
# define TZSIZE 40 /* max space allowed for a timezone string */
extern struct Library *SysBase;
long timezone = 0; /* should be pretty safe for reentrancy */
int daylight = 0;
LONG FileDate (char *filename, time_t u[]);
void tzset(void);
/* =============================================================== */
LONG FileDate(filename, u)
char *filename;
time_t u[];
{
LONG SetFileDate(UBYTE *filename, struct DateStamp *pDate);
LONG sendpkt(struct MsgPort *pid, LONG action, LONG *args, LONG nargs);
struct MsgPort *taskport;
BPTR dirlock, lock;
struct FileInfoBlock *fib;
LONG pktargs[4];
UBYTE *ptr;
long ret;
struct DateStamp pDate;
time_t mtime;
tzset();
mtime = u[0] - timezone;
/* magic number = 2922 = 8 years + 2 leaps between 1970 - 1978 */
pDate.ds_Days = (mtime / 86400L) - 2922L;
mtime = mtime % 86400L;
pDate.ds_Minute = mtime / 60L;
mtime = mtime % 60L;
pDate.ds_Tick = mtime * TICKS_PER_SECOND;
if (SysBase->lib_Version >= ReqVers) {
return (SetFileDate(filename,&pDate)); /* native routine at 2.0+ */
}
else /* !(SysBase->lib_Version >=ReqVers) */
{
if( !(taskport = (struct MsgPort *)DeviceProc(filename)) )
{
errno = ESRCH; /* no such process */
return FAILURE;
}
if( !(lock = Lock(filename,SHARED_LOCK)) )
{
errno = ENOENT; /* no such file */
return FAILURE;
}
if( !(fib = (struct FileInfoBlock *)AllocMem(
(long)sizeof(struct FileInfoBlock),MEMF_PUBLIC|MEMF_CLEAR)) )
{
errno = ENOMEM; /* insufficient memory */
UnLock(lock);
return FAILURE;
}
if( Examine(lock,fib)==FAILURE )
{
errno = EOSERR; /* operating system error */
UnLock(lock);
FreeMem(fib,(long)sizeof(*fib));
return FAILURE;
}
dirlock = ParentDir(lock);
ptr = (UBYTE *)AllocMem(64L,MEMF_PUBLIC);
strcpy((ptr+1),fib->fib_FileName);
*ptr = strlen(fib->fib_FileName);
FreeMem(fib,(long)sizeof(*fib));
UnLock(lock);
/* now fill in argument array */
pktargs[0] = 0;
pktargs[1] = (LONG)dirlock;
pktargs[2] = (LONG)&ptr[0] >> 2;
pktargs[3] = (LONG)&pDate;
errno = ret = sendpkt(taskport,ACTION_SET_DATE,pktargs,4L);
FreeMem(ptr,64L);
UnLock(dirlock);
return SUCCESS;
} /* ?(Sy