/*
 *	Copyright 1993, University Corporation for Atmospheric Research
 *      See netcdf/COPYRIGHT file for copying and redistribution conditions.
 */
/* $Id: error.c,v 1.14 90/02/23 16:08:55 davis Exp */

/*LINTLIBRARY*/

#include <config.h>
#include <stdio.h>
#include <stdarg.h>
#include <stdlib.h>

/* If netcdf-4 is in use, rename all nc_ functions to nc3_ functions. */
#ifdef USE_NETCDF4
#include <netcdf3.h>
#include <nc3convert.h>
#else
#include "netcdf.h"
#endif

#ifdef HAVE_STRERROR
#include <string.h> /* contains prototype for ansi libc function strerror() */
#else
/* provide a strerror function for older unix systems */
static char *
strerror(int errnum)
{
    extern int sys_nerr;
    extern char *sys_errlist[];

    if(errnum < 0 || errnum >= sys_nerr) return NULL;
    /* else */
    return sys_errlist[errnum];
}
#endif /* NO_STRERROR */


#ifdef vms
/* UNTESTED */
/*
 * On the vms system, when a system error occurs which is not
 * mapped into the unix styled errno values, errno is set EVMSERR
 * and a VMS error code is set in vaxc$errno.
 * This routine prints the systems message associated with status return
 * from a system services call.
 */

#include <errno.h>
#include <descrip.h>
#include <ssdef.h>

static const char *
vms_strerror( int status )
{
	short msglen;
	static char msgbuf[256];
	$DESCRIPTOR(message, msgbuf);
	register ret;

	msgbuf[0] = 0;
	ret = SYS$GETMSG(status, &msglen, &message, 15, 0);
	
	if(ret != SS$_BUFFEROVF && ret != SS$_NORMAL) {
		(void) strcpy(msgbuf, "EVMSERR");
	}
	return(msgbuf);
}
#endif /* vms */


static char unknown[] = "Unknown Error";


const char *
nc_strerror(int err)
{

#ifdef vms 
	if(err == EVMSERR)
	{
		return vms_strerror(err);
	}	
	/* else */
#endif /* vms */

	if(NC_ISSYSERR(err))
	{
		const char *cp = (const char *) strerror(err);
		if(cp == NULL)
			return unknown;
		/* else */
		return cp;
	}
	/* else */

	switch (err) {
	case NC_NOERR:
	    return "No error";
	case NC_EBADID:
	    return "NetCDF: Not a valid ID";
	case NC_ENFILE:
	    return "NetCDF: Too many files open";
	case NC_EEXIST:
	    return "NetCDF: File exists && NC_NOCLOBBER";
	case NC_EINVAL:
	    return "NetCDF: Invalid argument";
	case NC_EPERM:
	    return "NetCDF: Write to read only";
	case NC_ENOTINDEFINE:
	    return "NetCDF: Operation not allowed in data mode";
	case NC_EINDEFINE:
	    return "NetCDF: Operation not allowed in define mode";
	case NC_EINVALCOORDS:
	    return "NetCDF: Index exceeds dimension bound";
	case NC_EMAXDIMS:
	    return "NetCDF: NC_MAX_DIMS exceeded";
	case NC_ENAMEINUSE:
	    return "NetCDF: String match to name in use";
	case NC_ENOTATT:
	    return "NetCDF: Attribute not found";
	case NC_EMAXATTS:
	    return "NetCDF: NC_MAX_ATTRS exceeded";
	case NC_EBADTYPE:
	    return "NetCDF: Not a valid data type or _FillValue type mismatch";
	case NC_EBADDIM:
	    return "NetCDF: Invalid dimension ID or name";
	case NC_EUNLIMPOS:
	    return "NetCDF: NC_UNLIMITED in the wrong index";
	case NC_EMAXVARS:
	    return "NetCDF: NC_MAX_VARS exceeded";
	case NC_ENOTVAR:
	    return "NetCDF: Variable not found";
	case NC_EGLOBAL:
	    return "NetCDF: Action prohibited on NC_GLOBAL varid";
	case NC_ENOTNC:
	    return "NetCDF: Unknown file format";
	case NC_ESTS:
	    return "NetCDF: In Fortran, string too short";
	case NC_EMAXNAME:
	    return "NetCDF: NC_MAX_NAME exceeded";
	case NC_EUNLIMIT:
	    return "NetCDF: NC_UNLIMITED size already in use";
	case NC_ENORECVARS:
	    return "NetCDF: nc_rec op when there are no record vars";
	case NC_ECHAR:
	    return "NetCDF: Attempt to convert between text & numbers";
	case NC_EEDGE:
	    return "NetCDF: Start+count exceeds dimension bound";
	case NC_ESTRIDE:
	    return "NetCDF: Illegal stride";
	case NC_EBADNAME:
	    return "NetCDF: Name contains illegal characters";
	case NC_ERANGE:
	    return "NetCDF: Numeric conversion not representable";
	case NC_ENOMEM:
	    return "NetCDF: Memory allocation (malloc) failure";
	case NC_EVARSIZE:
	    return "NetCDF: One or more variable sizes violate format constraints";
	case NC_EDIMSIZE:
	    return "NetCDF: Invalid dimension size";
	case NC_ETRUNC:
	    return "NetCDF: File likely truncated or possibly corrupted";
	}
	/* default */
	return unknown;
}