/*
 * Copyright 1993-2002 Christopher Seiwald and Perforce Software, Inc.
 *
 * This file is part of Jam - see jam.c for Copyright information.
 */

/*
 * filevms.c - scan directories and libaries on VMS
 *
 * External routines:
 *
 *	file_dirscan() - scan a directory for files
 *	file_time() - get timestamp of file, if not done by file_dirscan()
 *	file_archscan() - scan an archive for files
 *
 * File_dirscan() and file_archscan() call back a caller provided function
 * for each file found.  A flag to this callback function lets file_dirscan()
 * and file_archscan() indicate that a timestamp is being provided with the
 * file.   If file_dirscan() or file_archscan() do not provide the file's
 * timestamp, interested parties may later call file_time().
 *
 * 02/09/95 (seiwald) - bungled R=[xxx] - was using directory length!
 * 05/03/96 (seiwald) - split into pathvms.c
 * 01/08/01 (seiwald) - closure param for file_dirscan/file_archscan
 * 03/23/01 (seiwald) - VMS C++ changes.
 * 11/04/02 (seiwald) - const-ing for string literals
 */

# include "jam.h"
# include "filesys.h"
# include "pathsys.h"

# ifdef OS_VMS

# include <rms.h>
# include <iodef.h>
# include <ssdef.h>
# include <string.h>
# include <stdlib.h>
# include <stdio.h>
# include <descrip.h>

#include <lbrdef.h>
#include <credef.h>
#include <mhddef.h>
#include <lhidef.h>
#include <lib$routines.h>
#include <starlet.h>

/* Supply missing prototypes for lbr$-routines*/

extern "C" { 

int lbr$set_module( 
	void **,
	unsigned long *,
	struct dsc$descriptor_s *,
	unsigned short *, 
	void * );

int lbr$open( void **,
	struct dsc$descriptor_s *,
	void *,
	void *, 
	void *,
	void *,
	void * );

int lbr$ini_control(
	void **,
	unsigned long *,
	unsigned long *,
	void * );

int lbr$get_index(
	void **,
	unsigned long *,
	int (*func)( struct dsc$descriptor_s *, unsigned long *),
	void * );

int lbr$close(
	void ** );

} 

static void
file_cvttime( 
    unsigned int *curtime,
    time_t *unixtime )
{
    static const size_t divisor = 10000000;
    static unsigned int bastim[2] = { 0x4BEB4000, 0x007C9567 }; /* 1/1/1970 */
    int delta[2], remainder;

    lib$subx( curtime, bastim, delta );
    lib$ediv( &divisor, delta, unixtime, &remainder );
}

# define DEFAULT_FILE_SPECIFICATION "[]*.*;0"

# define min( a,b ) ((a)<(b)?(a):(b))

void
file_dirscan( 
	const char *dir,
	scanback func,
	void	*closure )
{

    struct FAB xfab;
    struct NAM xnam;
    struct XABDAT xab;
    char esa[256];
    char filename[256];
    char filename2[256];
    char dirname[256];
    register int status;
    PATHNAME f;

    memset( (char *)&f, '\0', sizeof( f ) );

    f.f_root.ptr = dir;
    f.f_root.len = strlen( dir );

	/* get the input file specification
	 */
    xnam = cc$rms_nam;
    xnam.nam$l_esa = esa;
    xnam.nam$b_ess = sizeof( esa ) - 1;
    xnam.nam$l_rsa = filename;
    xnam.nam$b_rss = min( sizeof( filename ) - 1, NAM$C_MAXRSS );

    xab = cc$rms_xabdat;                /* initialize extended attributes */
    xab.xab$b_cod = XAB$C_DAT;		/* ask for date */
    xab.xab$l_nxt = NULL;               /* terminate XAB chain      */

    xfab = cc$rms_fab;
    xfab.fab$l_dna = DEFAULT_FILE_SPECIFICATION;
    xfab.fab$b_dns = sizeof( DEFAULT_FILE_SPECIFICATION ) - 1;
    xfab.fab$l_fop = FAB$M_NAM;
    xfab.fab$l_fna = (char *)dir;		/* address of file name	    */
    xfab.fab$b_fns = strlen( dir );		/* length of file name	    */
    xfab.fab$l_nam = &xnam;			/* address of NAB block	    */
    xfab.fab$l_xab = (char *)&xab;       /* address of XAB block     */


    status = sys$parse( &xfab );

    if( DEBUG_BINDSCAN )
	printf( "scan directory %s\n", dir );

    if ( !( status & 1 ) )
	return;



    /* Add bogus directory for [000000] */

    if( !strcmp( dir, "[000000]" ) )
    {
	(*func)( closure, "[000000]", 1 /* time valid */, 1 /* old but true */ );
    }

    /* Add bogus directory for [] */

    if( !strcmp( dir, "[]" ) )
    {
	(*func)( closure, "[]", 1 /* time valid */, 1 /* old but true */ );
	(*func)( closure, "[-]", 1 /* time valid */, 1 /* old but true */ );
    }

    while ( (status = sys$search( &xfab )) & 1 )
    {
	char *s;
	time_t time;

	/* "I think that might work" - eml */

	sys$open( &xfab );
	sys$close( &xfab );

	file_cvttime( (unsigned int *)&xab.xab$q_rdt, &time );

	filename[xnam.nam$b_rsl] = '\0';

	/* What we do with the name depends on the suffix: */
	/* .dir is a directory */
	/* .xxx is a file with a suffix */
	/* . is no suffix at all */

	if( xnam.nam$b_type == 4 && !strncmp( xnam.nam$l_type, ".DIR", 4 ) )
	{
	    /* directory */
	    sprintf( dirname, "[.%.*s]", xnam.nam$b_name, xnam.nam$l_name );
	    f.f_dir.ptr = dirname;
	    f.f_dir.len = strlen( dirname );
	    f.f_base.ptr = 0;
	    f.f_base.len = 0;
	    f.f_suffix.ptr = 0;
	    f.f_suffix.len = 0;
	}
	else
	{
	    /* normal file with a suffix */
	    f.f_dir.ptr = 0;
	    f.f_dir.len = 0;
	    f.f_base.ptr = xnam.nam$l_name;
	    f.f_base.len = xnam.nam$b_name;
	    f.f_suffix.ptr = xnam.nam$l_type;
	    f.f_suffix.len = xnam.nam$b_type;
	}

	path_build( &f, filename2, 0 );

	/*
	if( DEBUG_SEARCH )
	    printf("root '%s' base %.*s suf %.*s = %s\n",
		    dir,
		    xnam.nam$b_name, xnam.nam$l_name, 
		    xnam.nam$b_type, xnam.nam$l_type,
		    filename2);
	*/

	(*func)( closure, filename2, 1 /* time valid */, time );
    }
}    

int
file_time(
	const char *filename,
	time_t	*time )
{
	/* This should never be called, as all files are */
	/* timestampped in file_dirscan() and file_archscan() */
	return -1;
}

static char *VMS_archive = 0;
static scanback VMS_func;
static void *VMS_closure;
static void *context;

static int
file_archmember( 
    struct dsc$descriptor_s *module,
    unsigned long *rfa )
{
    static struct dsc$descriptor_s bufdsc =
		  {0, DSC$K_DTYPE_T, DSC$K_CLASS_S, NULL};

    struct mhddef *mhd;
    char filename[128];
    char buf[ MAXJPATH ];

    int status;
    time_t library_date;

    register int i;
    register char *p;

    bufdsc.dsc$a_pointer = filename;
    bufdsc.dsc$w_length = sizeof( filename );
    status = lbr$set_module( &context, rfa, &bufdsc,
			     &bufdsc.dsc$w_length, NULL );

    if ( !(status & 1) )
	return ( 1 );

    mhd = (struct mhddef *)filename;

    file_cvttime( &mhd->mhd$l_datim, &library_date );

    for ( i = 0, p = module->dsc$a_pointer; i < module->dsc$w_length; i++, p++ )
	filename[i] = *p;

    filename[i] = '\0';

    sprintf( buf, "%s(%s.obj)", VMS_archive, filename );

    (*VMS_func)( VMS_closure, buf, 1 /* time valid */, (time_t)library_date );

    return ( 1 );
}

void
file_archscan(
	const char *archive,
	scanback func,
	void	*closure )
{
    static struct dsc$descriptor_s library =
		  {0, DSC$K_DTYPE_T, DSC$K_CLASS_S, NULL};

    unsigned long lfunc = LBR$C_READ;
    unsigned long typ = LBR$C_TYP_UNK;
    unsigned long index = 1;

    register int status;

    VMS_archive = (char *)archive;
    VMS_func = func;
    VMS_closure = closure;

    status = lbr$ini_control( &context, &lfunc, &typ, NULL );
    if ( !( status & 1 ) )
	return;

    library.dsc$a_pointer = (char *)archive;
    library.dsc$w_length = strlen( archive );

    status = lbr$open( &context, &library, NULL, NULL, NULL, NULL, NULL );
    if ( !( status & 1 ) )
	return;

    (void) lbr$get_index( &context, &index, file_archmember, NULL );

    (void) lbr$close( &context );
}

# endif /* VMS */