/*
 * Copyright © 1998 NCSA
 *                  All rights reserved.
 *
 * Programmer:  Robb Matzke <matzke@llnl.gov>
 *              Thursday, November 19, 1998
 *
 * Purpose:	Provides support functions for most of the hdf5 tests cases.
 *		
 */

#undef NDEBUG			/*override -DNDEBUG			*/
#include <h5test.h>

/*
 * Define these environment variables or constants to influence functions in
 * this test support library.  The environment variable is used in preference
 * to the cpp constant.  If neither is defined then use some default value.
 *
 * HDF5_PREFIX:		A string to add to the beginning of all file names.
 *			This can be used to tell MPIO what driver to use
 *			(e.g., "gfs:", "ufs:", or "nfs:") or to use a
 *			different file system (e.g., "/tmp" or "/usr/tmp").
 *			The prefix will be separated from the base file name
 *			by a slash. See h5_fixname() for details.
 *
 * HDF5_DRIVER:		This string describes what low level file driver to
 *			use for HDF5 file access.  The first word in the
 *			value is the name of the driver and subsequent data
 *			is interpreted according to the driver.  See
 *			h5_fileaccess() for details.
 *
 */

/*
 * These are the letters that are appended to the file name when generating
 * names for the split and multi drivers. They are:
 *
 * 	m: All meta data when using the split driver.
 *	s: The userblock, superblock, and driver info block
 *	b: B-tree nodes
 *	r: Dataset raw data
 *	g: Global heap
 *	l: local heap (object names)
 *	o: object headers
 */
static const char *multi_letters = "msbrglo";


/*-------------------------------------------------------------------------
 * Function:	h5_errors
 *
 * Purpose:	Displays the error stack after printing "*FAILED*".
 *
 * Return:	Success:	0
 *
 *		Failure:	-1
 *
 * Programmer:	Robb Matzke
 *		Wednesday, March  4, 1998
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
herr_t
h5_errors(void UNUSED *client_data)
{
    FAILED();
    H5Eprint (stdout);
    return 0;
}


/*-------------------------------------------------------------------------
 * Function:	h5_cleanup
 *
 * Purpose:	Cleanup temporary test files.  The list of test files is in
 *		`extern const char *FILENAMES[]' -- these are only the base
 * 		names.  The file access property list is also closed.
 *
 * Return:	Non-zero if cleanup actions were performed; zero otherwise.
 *
 * Programmer:	Albert Cheng
 *              May 28, 1998
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
int
h5_cleanup(hid_t fapl)
{
    char	filename[1024];
    char	temp[2048];
    int		i, j;
    int		retval=0;
    hid_t	driver;

    if (!getenv("HDF5_NOCLEANUP")) {
	for (i=0; FILENAME[i]; i++) {
	    if (NULL==h5_fixname(FILENAME[i], fapl, filename,
				 sizeof filename)) {
		continue;
	    }

	    driver = H5Pget_driver(fapl);
	    if (H5FD_FAMILY==driver) {
		for (j=0; /*void*/; j++) {
		    HDsnprintf(temp, sizeof temp, filename, j);
		    if (access(temp, F_OK)<0) break;
		    remove(temp);
		}
	    } else if (H5FD_CORE==driver) {
		/*void*/
	    } else if (H5FD_MULTI==driver) {
		H5FD_mem_t mt;
		assert(strlen(multi_letters)==H5FD_MEM_NTYPES);
		for (mt=0; mt<H5FD_MEM_NTYPES; mt++) {
		    HDsnprintf(temp, sizeof temp, "%s-%c.h5",
			       filename, multi_letters[mt]);
		    remove(temp); /*don't care if it fails*/
		}
	    } else {
		remove(filename);
	    }
	}
	retval=1;
    }
    H5Pclose(fapl);
    return retval;
}


/*-------------------------------------------------------------------------
 * Function:	h5_reset
 *
 * Purpose:	Reset the library by closing it.
 *
 * Return:	void
 *
 * Programmer:	Robb Matzke
 *              Friday, November 20, 1998
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
void
h5_reset(void)
{
    char	filename[1024];
    
    fflush(stdout);
    fflush(stderr);
    H5close();
    H5Eset_auto (h5_errors, NULL);

    /*
     * Cause the library to emit some diagnostics early so they don't
     * interfere with other formatted output.
     */
    sprintf(filename, "/tmp/h5emit-%05d.h5", getpid());
    H5E_BEGIN_TRY {
	hid_t file = H5Fcreate(filename, H5F_ACC_TRUNC, H5P_DEFAULT,
			       H5P_DEFAULT);
	hid_t grp = H5Gcreate(file, "emit", 0);
	H5Gclose(grp);
	H5Fclose(file);
	unlink(filename);
    } H5E_END_TRY;
}


/*-------------------------------------------------------------------------
 * Function:	h5_fixname
 *
 * Purpose:	Create a file name from a file base name like `test' and
 *		return it through the FULLNAME (at most SIZE characters
 *		counting the null terminator). The full name is created by
 *		prepending the contents of HDF5_PREFIX (separated from the
 *		base name by a slash) and appending a file extension based on
 *		the driver supplied.
 *
 * Return:	Success:	The FULLNAME pointer.
 *
 *		Failure:	NULL if BASENAME or FULLNAME is the null
 *				pointer or if FULLNAME isn't large enough for
 *				the result.
 *
 * Programmer:	Robb Matzke
 *              Thursday, November 19, 1998
 *
 * Modifications:
 *		Robb Matzke, 1999-08-03
 *		Modified to use the virtual file layer.
 *-------------------------------------------------------------------------
 */
char *
h5_fixname(const char *base_name, hid_t fapl, char *fullname, size_t size)
{
    const char	*prefix=NULL, *suffix=NULL;
    hid_t	driver;
    
    if (!base_name || !fullname || size<1) return NULL;

    /* First use the environment variable, then try the constant */
    prefix = getenv("HDF5_PREFIX");
#ifdef HDF5_PREFIX
    if (!prefix) prefix = HDF5_PREFIX;
#endif

    /* Prepend the prefix value to the base name */
    if (prefix && *prefix) {
	if (HDsnprintf(fullname, size, "%s/%s", prefix, base_name)==(int)size) {
	    return NULL; /*buffer is too small*/
	}
    } else if (strlen(base_name)>=size) {
	return NULL; /*buffer is too small*/
    } else {
	strcpy(fullname, base_name);
    }

    /* Append a suffix */
    if ((driver=H5Pget_driver(fapl))<0) return NULL;
    if (H5FD_FAMILY==driver) {
	suffix = "%05d.h5";
    } else if (H5FD_CORE==driver || H5FD_MULTI==driver) {
	suffix = NULL;
    } else {
	suffix = ".h5";
    }
    
    if (suffix) {
	if (strlen(fullname)+strlen(suffix)>=size) return NULL;
	strcat(fullname, suffix);
    }
    
    return fullname;
}


/*-------------------------------------------------------------------------
 * Function:	h5_fileaccess
 *
 * Purpose:	Returns a file access template which is the default template
 *		but with a file driver set according to the constant or
 *		environment variable HDF5_DRIVER
 *
 * Return:	Success:	A file access property list
 *
 *		Failure:	-1
 *
 * Programmer:	Robb Matzke
 *              Thursday, November 19, 1998
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
hid_t
h5_fileaccess(void)
{
    const char	*val = NULL;
    const char	*name;
    char	s[1024];
    hid_t	fapl = -1;
    hsize_t	fam_size = 100*1024*1024; /*100 MB*/
    H5FD_mem_t	mt;
    
    /* First use the environment variable, then the constant */
    val = getenv("HDF5_DRIVER");
#ifdef HDF5_DRIVER
    if (!val) val = HDF5_DRIVER;
#endif

    if ((fapl=H5Pcreate(H5P_FILE_ACCESS))<0) return -1;
    if (!val || !*val) return fapl; /*use default*/
    
    strncpy(s, val, sizeof s);
    s[sizeof(s)-1] = '\0';
    if (NULL==(name=strtok(s, " \t\n\r"))) return fapl;

    if (!strcmp(name, "sec2")) {
	/* Unix read() and write() system calls */
	if (H5Pset_fapl_sec2(fapl)<0) return -1;
    } else if (!strcmp(name, "stdio")) {
	/* Standard C fread() and fwrite() system calls */
	if (H5Pset_fapl_stdio(fapl)<0) return -1;
    } else if (!strcmp(name, "core")) {
	/* In-core temporary file with 1MB increment */
	if (H5Pset_fapl_core(fapl, 1024*1024, FALSE)<0) return -1;
    } else if (!strcmp(name, "split")) {
	/* Split meta data and raw data each using default driver */
	if (H5Pset_fapl_split(fapl,
			      "-m.h5", H5P_DEFAULT,
			      "-r.h5", H5P_DEFAULT)<0)
	    return -1;
    } else if (!strcmp(name, "multi")) {
	/* Multi-file driver, general case of the split driver */
	H5FD_mem_t memb_map[H5FD_MEM_NTYPES];
	hid_t memb_fapl[H5FD_MEM_NTYPES];
	const char *memb_name[H5FD_MEM_NTYPES];
	char sv[H5FD_MEM_NTYPES][1024];
	haddr_t memb_addr[H5FD_MEM_NTYPES];

	memset(memb_map, 0, sizeof memb_map);
	memset(memb_fapl, 0, sizeof memb_fapl);
	memset(memb_name, 0, sizeof memb_name);
	memset(memb_addr, 0, sizeof memb_addr);

	assert(strlen(multi_letters)==H5FD_MEM_NTYPES);
	for (mt=0; mt<H5FD_MEM_NTYPES; mt++) {
	    memb_fapl[mt] = H5P_DEFAULT;
	    sprintf(sv[mt], "%%s-%c.h5", multi_letters[mt]);
	    memb_name[mt] = sv[mt];
	    memb_addr[mt] = MAX(mt-1,0)*(HADDR_MAX/10);
	}

	if (H5Pset_fapl_multi(fapl, memb_map, memb_fapl, memb_name,
			      memb_addr, FALSE)<0) {
	    return -1;
	}
    } else if (!strcmp(name, "family")) {
	/* Family of files, each 1MB and using the default driver */
	if ((val=strtok(NULL, " \t\n\r"))) {
	    fam_size = strtod(val, NULL) * 1024*1024;
	}
	if (H5Pset_fapl_family(fapl, fam_size, H5P_DEFAULT)<0) return -1;
    } else {
	/* Unknown driver */
	return -1;
    }

    return fapl;
}


/*-------------------------------------------------------------------------
 * Function:	h5_no_hwconv
 *
 * Purpose:	Turn off hardware data type conversions.
 *
 * Return:	void
 *
 * Programmer:	Robb Matzke
 *              Friday, November 20, 1998
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
void
h5_no_hwconv(void)
{
    H5Tunregister(H5T_PERS_HARD, NULL, -1, -1, NULL);
}