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OS/2 Shareware BBS: 9 Archive
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zip21.zip
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amiga
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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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/* 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;
} /* ?(SysBase->lib_Version >= ReqVers) */
} /* FileDate() */
void tzset(void) /* check Locale and TZ -- the environment overrides */
{
struct Library *LocaleBase;
struct Locale *ll;
char TZstring[TZSIZE], *p;
struct Process *me = (void *) FindTask(NULL);
void *old_window = me->pr_WindowPtr;
BPTR eh;
int z, valid = FALSE;
static zone_is_set = FALSE; /* should be okayish with reentrancy */
if (zone_is_set)
return;
timezone = 5 * 60; /* default */
me->pr_WindowPtr = (void *) -1; /* suppress any "Please insert" popups */
if (SysBase->lib_Version >= ReqVers) {
if (GetVar("TZ", TZstring, TZSIZE - 1, /* GVF_GLOBAL_ONLY */ 0) <= 0)
TZstring[0] = 0;
} else { /* early AmigaDOS, get env var the crude way */
z = 0;
if (eh = Open("ENV:TZ", MODE_OLDFILE)) {
z = Read(eh, TZstring, TZSIZE - 1);
Close(eh);
if (z < 0)
z = 0;
}
TZstring[z] = '\0';
}
if (TZstring[0]) {
z = 3600;
for (p = TZstring; *p && !isdigit(*p) && *p != '-'; p++) ;
if (*p == '-')
z = -3600, p++;
if (*p) {
timezone = 0;
do {
while (isdigit(*p))
timezone = timezone * 10 + z * (*p++ - '0'), valid = TRUE;
if (*p == ':') p++;
} while (isdigit(*p) && (z /= 60) > 0);
}
while (isspace(*p)) p++; /* probably not needed */
if (valid)
zone_is_set = TRUE, daylight = !!*p; /* a DST name part exists */
}
if (!valid && (LocaleBase = OpenLibrary("locale.library", 0))) {
if (ll = OpenLocale(NULL)) {
z = ll->loc_GMTOffset;
if (z == -5) {
if (eh = Lock("ENV:sys/locale.prefs", ACCESS_READ))
UnLock(eh);
else
z = 5; /* bug: locale not initialized, default is bogus! */
} else
zone_is_set = TRUE;
timezone = z * 60;
daylight = (z >= 4*60 && z <= 9*60); /* apply in the Americas */
CloseLocale(ll);
}
CloseLibrary(LocaleBase);
}
me->pr_WindowPtr = old_window;
}
struct tm *gmtime(const time_t *when)
{
static struct tm tbuf; /* this function is intrinsically non-reentrant */
static short smods[12] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
long days = *when / 86400;
long secs = *when % 86400;
short yell, yday;
tbuf.tm_wday = (days + 4) % 7; /* 1/1/70 is a Thursday */
tbuf.tm_year = 70 + 4 * (days / 1461);
yday = days % 1461;
while (yday >= (yell = (tbuf.tm_year & 3 ? 365 : 366)))
yday -= yell, tbuf.tm_year++;
smods[1] = (tbuf.tm_year & 3 ? 28 : 29);
tbuf.tm_mon = 0;
tbuf.tm_yday = yday;
while (yday >= smods[tbuf.tm_mon])
yday -= smods[tbuf.tm_mon++];
tbuf.tm_mday = yday + 1;
tbuf.tm_isdst = 0;
tbuf.tm_sec = secs % 60;
tbuf.tm_min = (secs / 60) % 60;
tbuf.tm_hour = secs / 3600;
#ifdef AZTEC_C
tbuf.tm_hsec = 0;
#endif
return &tbuf;
}
struct tm *localtime(const time_t *when)
{
struct tm *t;
time_t localwhen;
int dst = FALSE, sundays, lastweekday;
tzset();
localwhen = *when - timezone;
t = gmtime(&localwhen);
/* So far we support daylight savings correction by the USA rule only: */
if (daylight && t->tm_mon >= 3 && t->tm_mon <= 9) {
if (t->tm_mon > 3 && t->tm_mon < 9) /* May Jun Jul Aug Sep: yes */
dst = TRUE;
else {
sundays = (t->tm_mday + 6 - t->tm_wday) / 7;
if (t->tm_wday == 0 && t->tm_hour < 2 && sundays)
sundays--; /* a Sunday does not count until 2:00am */
if (t->tm_mon == 3 && sundays > 0) /* first sunday in April */
dst = TRUE;
else if (t->tm_mon == 9) {
lastweekday = (t->tm_wday + 31 - t->tm_mday) % 7;
if (sundays < (37 - lastweekday) / 7)
dst = TRUE; /* last sunday in October */
}
}
if (dst) {
localwhen += 3600;
t = gmtime(&localwhen); /* crude but effective */
t->tm_isdst = 1;
}
}
return t;
}
#ifdef ZIP
time_t time(time_t *tp)
{
time_t t;
struct DateStamp ds;
DateStamp(&ds);
t = ds.ds_Tick / TICKS_PER_SECOND + ds.ds_Minute * 60
+ (ds.ds_Days + 2922) * 86400;
t = mktime(gmtime(&t));
/* gmtime leaves ds in the local timezone, mktime converts it to GMT */
if (tp) *tp = t;
return t;
}
#endif /* ZIP */
#endif /* !FUNZIP */
#if defined(CRYPT) || !defined(FUNZIP)
/* sendpkt.c
* by A. Finkel, P. Lindsay, C. Sheppner
* returns Res1 of the reply packet
*/
/*
#include <exec/types.h>
#include <exec/memory.h>
#include <libraries/dos.h>
#include <libraries/dosextens.h>
#include <proto/exec.h>
#include <proto/dos.h>
*/
LONG sendpkt(pid,action,args,nargs)
struct MsgPort *pid; /* process identifier (handler message port) */
LONG action, /* packet type (desired action) */
*args, /* a pointer to argument list */
nargs; /* number of arguments in list */
{
struct MsgPort *replyport, *CreatePort(UBYTE *, long);
void DeletePort(struct MsgPort *);
struct StandardPacket *packet;
LONG count, *pargs, res1;
replyport = CreatePort(NULL,0L);
if( !replyport ) return(0);
packet = (struct StandardPacket *)AllocMem(
(long)sizeof(struct StandardPacket),MEMF_PUBLIC|MEMF_CLEAR);
if( !packet )
{
DeletePort(replyport);
return(0);
}
packet->sp_Msg.mn_Node.ln_Name = (char *)&(packet->sp_Pkt);
packet->sp_Pkt.dp_Link = &(packet->sp_Msg);
packet->sp_Pkt.dp_Port = replyport;
packet->sp_Pkt.dp_Type = action;
/* copy the args into the packet */
pargs = &(packet->sp_Pkt.dp_Arg1); /* address of 1st argument */
for( count=0; count<nargs; count++ )
pargs[count] = args[count];
PutMsg(pid,(struct Message *)packet); /* send packet */
WaitPort(replyport);
GetMsg(replyport);
res1 = packet->sp_Pkt.dp_Res1;
FreeMem((char *)packet,(long)sizeof(*packet));
DeletePort(replyport);
return(res1);
} /* sendpkt() */
#endif /* CRYPT || !FUNZIP */
#if defined(CRYPT) || (defined(UNZIP) && !defined(FUNZIP))
/* Agetch() reads one raw keystroke -- uses sendpkt() */
int Agetch(void)
{
LONG sendpkt(struct MsgPort *pid, LONG action, LONG *args, LONG nargs);
struct Task *me = FindTask(NULL);
struct CommandLineInterface *cli = BADDR(((struct Process *) me)->pr_CLI);
BPTR fh = cli->cli_StandardInput; /* this is immune to < redirection */
void *conp = ((struct FileHandle *) BADDR(fh))->fh_Type;
char longspace[8];
long *flag = (long *) ((ULONG) &longspace[4] & ~3); /* LONGWORD ALIGNED! */
UBYTE c;
*flag = 1;
sendpkt(conp, ACTION_SCREEN_MODE, flag, 1); /* assume success */
Read(fh, &c, 1);
*flag = 0;
sendpkt(conp, ACTION_SCREEN_MODE, flag, 1);
if (c == 3) /* ^C in input */
Signal(me, SIGBREAKF_CTRL_C);
return c;
}
#endif /* CRYPT || (UNZIP && !FUNZIP) */