/*
 *  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 "ncconfig.h"
#include <stdio.h>
#include <stdarg.h>
#include <stdlib.h>
#include "netcdf.h"


#ifndef NO_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 "Not a netCDF id";
  case NC_ENFILE:
      return "Too many netCDF files open";
  case NC_EEXIST:
      return "netCDF file exists && NC_NOCLOBBER";
  case NC_EINVAL:
      return "Invalid argument";
  case NC_EPERM:
      return "Write to read only";
  case NC_ENOTINDEFINE:
      return "Operation not allowed in data mode";
  case NC_EINDEFINE:
      return "Operation not allowed in define mode";
  case NC_EINVALCOORDS:
      return "Index exceeds dimension bound";
  case NC_EMAXDIMS:
      return "NC_MAX_DIMS exceeded";
  case NC_ENAMEINUSE:
      return "String match to name in use";
  case NC_ENOTATT:
      return "Attribute not found";
  case NC_EMAXATTS:
      return "NC_MAX_ATTRS exceeded";
  case NC_EBADTYPE:
      return "Not a netCDF data type or _FillValue type mismatch";
  case NC_EBADDIM:
      return "Invalid dimension id or name";
  case NC_EUNLIMPOS:
      return "NC_UNLIMITED in the wrong index";
  case NC_EMAXVARS:
      return "NC_MAX_VARS exceeded";
  case NC_ENOTVAR:
      return "Variable not found";
  case NC_EGLOBAL:
      return "Action prohibited on NC_GLOBAL varid";
  case NC_ENOTNC:
      return "Not a netCDF file";
  case NC_ESTS:
      return "In Fortran, string too short";
  case NC_EMAXNAME:
      return "NC_MAX_NAME exceeded";
  case NC_EUNLIMIT:
      return "NC_UNLIMITED size already in use";
  case NC_ENORECVARS:
      return "nc_rec op when there are no record vars";
  case NC_ECHAR:
      return "Attempt to convert between text & numbers";
  case NC_EEDGE:
      return "Edge+start exceeds dimension bound";
  case NC_ESTRIDE:
      return "Illegal stride";
  case NC_EBADNAME:
      return "Attribute or variable name contains illegal characters";
  case NC_ERANGE:
      return "Numeric conversion not representable";
  case NC_ENOMEM:
      return "Memory allocation (malloc) failure";
  }
  /* default */
  return unknown;
}
