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t_ncx.c

/*
 *    Copyright 1996, University Corporation for Atmospheric Research
 *    See netcdf/COPYRIGHT file for copying and redistribution conditions.
 */
/* $Id: t_ncx.c,v 1.44 1998/03/06 22:11:18 davis Exp $ */

#include <stdio.h>
#include <limits.h>
/* alias poorly named limits.h macros */
#define  SHORT_MAX  SHRT_MAX
#define  SHORT_MIN  SHRT_MIN
#define USHORT_MAX USHRT_MAX
#include <rpc/types.h>
#include <rpc/xdr.h>
#include <string.h>
#include "ncx.h"

#define NO_UNSIGNED
#define NO_UNSIGNED_LONG

/*
 * This program tests the xdr_mem implementation and
 * the ncx_ implementation, and compares the two.
 * Link like this: 
 * cc t_ncx.c ncx.o [-lsome_xdr_lib] -o t_nxc
 * Successful output is:
      xdr_encode ends at byte 640
      xdr_check  ends at byte 640
      ncx_encode ends at byte 640
      ncx_check  ends at byte 640
      xdr_check  ends at byte 640
      ncx_check  ends at byte 640
 * with exit status 0;
 */

#define XBSZ 1024

char xdrb[XBSZ];
char ncxb[XBSZ];

#define ArraySize(thang) (sizeof(thang)/sizeof(thang[0]))
#define uiArraySize(thang) ((u_int)ArraySize(thang))
#define eSizeOf(thang) ((u_int)(sizeof(thang[0])))

/*
 * Some test data
 */

static char text[] = { "Hiya sailor. New in town?" };

/*
 * Some test data
 * The ideas is that ncx_putn_type_type(...., types)
 * should not return NC_ERANGE.
 */

#if SCHAR_MAX == X_SCHAR_MAX && SCHAR_MIN == X_SCHAR_MIN
static schar schars[] = {
      SCHAR_MIN, SCHAR_MIN +1,
      -1, 0, 1,
      SCHAR_MAX - 1, SCHAR_MAX
};
#else
/* The implementation and this test assume 8 bit bytes. */
#error "Not 8 bit bytes ??"
#endif

static short shorts[] = {
#if SHORT_MAX <= X_SHORT_MAX
      SHORT_MIN, SHORT_MIN + 1,
#  if SCHAR_MAX < X_SHORT_MAX
      SCHAR_MIN - 1, SCHAR_MIN, SCHAR_MIN + 1,
#  endif
      -1, 0, 1,
#  if SCHAR_MAX < X_SHORT_MAX
      SCHAR_MAX - 1, SCHAR_MAX, SCHAR_MAX + 1,
#  endif
      SHORT_MAX - 1, SHORT_MAX
#else
      X_SHORT_MIN, X_SHORT_MIN + 1,
#  if SCHAR_MAX < X_SHORT_MAX
      SCHAR_MIN - 1, SCHAR_MIN, SCHAR_MIN + 1,
#  endif
      -1, 0, 1,
#  if SCHAR_MAX < X_SHORT_MAX
      SCHAR_MAX - 1, SCHAR_MAX, SCHAR_MAX + 1,
#  endif
      X_SHORT_MAX - 1, X_SHORT_MAX
#endif
};

static int ints[] = {
#if INT_MAX <= X_INT_MAX
      INT_MIN, INT_MIN +1,
#  if SHORT_MAX < X_INT_MAX
      SHORT_MIN -1, SHORT_MIN, SHORT_MIN + 1,
#  endif
#  if SCHAR_MAX < X_INT_MAX
      SCHAR_MIN - 1, SCHAR_MIN, SCHAR_MIN + 1,
#  endif
      -1, 0, 1,
#  if SCHAR_MAX < X_INT_MAX
      SCHAR_MAX - 1, SCHAR_MAX, SCHAR_MAX + 1,
#  endif
#  if SHORT_MAX < X_INT_MAX
      SHORT_MAX - 1, SHORT_MAX, SHORT_MAX +1,
#  endif
      INT_MAX - 1, INT_MAX
#else
      X_INT_MIN, X_INT_MIN +1,
#  if SHORT_MAX < X_INT_MAX
      SHORT_MIN -1, SHORT_MIN, SHORT_MIN + 1,
#  endif
#  if SCHAR_MAX < X_INT_MAX
      SCHAR_MIN - 1, SCHAR_MIN, SCHAR_MIN + 1,
#  endif
      -1, 0, 1,
#  if SCHAR_MAX < X_INT_MAX
      SCHAR_MAX - 1, SCHAR_MAX, SCHAR_MAX + 1,
#  endif
#  if SHORT_MAX < X_INT_MAX
      SHORT_MAX - 1, SHORT_MAX, SHORT_MAX +1,
#  endif
      X_INT_MAX - 1, X_INT_MAX
#endif /* INT */
};


/* N.B. only testing longs over X_INT range for now */
static long longs[] = {
#if LONG_MAX <= X_INT_MAX
      LONG_MIN, LONG_MIN +1,
#  if INT_MAX < X_INT_MAX
      INT_MIN -1, INT_MIN, INT_MIN + 1,
#  endif
#  if SHORT_MAX < X_INT_MAX
      SHORT_MIN -1, SHORT_MIN, SHORT_MIN + 1,
#  endif
#  if SCHAR_MAX < X_INT_MAX
      SCHAR_MIN - 1, SCHAR_MIN, SCHAR_MIN + 1,
#  endif
      -1, 0, 1,
#  if SCHAR_MAX < X_INT_MAX
      SCHAR_MAX - 1, SCHAR_MAX, SCHAR_MAX + 1,
#  endif
#  if SHORT_MAX < X_INT_MAX
      SHORT_MAX - 1, SHORT_MAX, SHORT_MAX +1,
#  endif
#  if INT_MAX < X_INT_MAX
      INT_MAX -1, INT_MAX, INT_MAX + 1,
#  endif
      LONG_MAX - 1, LONG_MAX
#else
      X_INT_MIN, X_INT_MIN +1,
#  if SHORT_MAX < X_INT_MAX
      SHORT_MIN -1, SHORT_MIN, SHORT_MIN + 1,
#  endif
#  if SCHAR_MAX < X_INT_MAX
      SCHAR_MIN - 1, SCHAR_MIN, SCHAR_MIN + 1,
#  endif
      -1, 0, 1,
#  if SCHAR_MAX < X_INT_MAX
      SCHAR_MAX - 1, SCHAR_MAX, SCHAR_MAX + 1,
#  endif
#  if SHORT_MAX < X_INT_MAX
      SHORT_MAX - 1, SHORT_MAX, SHORT_MAX +1,
#  endif
      X_INT_MAX - 1, X_INT_MAX
#endif
};

static float floats[] = {
       -100.625, -100.5, -100.375, -100.25, -100.125,
      -1.0, -.125, 0., .125, 1.,
       100.125, 100.25, 100.375, 100.5, 100.625
};

/* The big numbers require 25 bits: 2^(25-i)+1/2^i, i = 2, 3, ..., 6 */
static double doubles[] = {
      -8388608.25, -4194304.125, -2097152.0625, -1048576.03125, -524288.015625
      -100.625, -100.5, -100.375, -100.25, -100.125,
      -1.0, -.125, 0., .125, 1.,
      100.125, 100.25, 100.375, 100.5, 100.625,
      524288.015625, 1048576.03125, 2097152.0625, 4194304.125, 8388608.25
};

/* End of test data */

/*
 *    Copyright 1993, University Corporation for Atmospheric Research
 *      See netcdf/COPYRIGHT file for copying and redistribution conditions.
 */
/*    $Id: t_ncx.c,v 1.44 1998/03/06 22:11:18 davis Exp $ */

/* putget.c */
/*
 * xdr 1 - 3 bytes, leaving adjoining bytes within the word ok.
 * (minimum unit of io is 4 bytes)
 */
static bool_t
xdr_NCvbyte(XDR *xdrs, unsigned rem, unsigned count, char *value) 
{
      char buf[4] ;
      u_int origin ;
      enum xdr_op  x_op = xdrs->x_op ; /* save state */

      if(x_op == XDR_ENCODE)
      {
      /*
       * Since we only read/write multiples of four bytes,
       * We will read in the word to change one byte in it.
       */
            origin = xdr_getpos( xdrs ) ;
            /* next op is a get */
            xdrs->x_op = XDR_DECODE ;
      }

      if(!xdr_opaque(xdrs, buf, 4))
      {
            /* get failed, assume we are trying to read off the end */
            (void)memset(buf, 0, sizeof(buf)) ;
      }

      if(x_op == XDR_ENCODE) /* back to encode */
            xdrs->x_op = x_op ;

      while(count-- != 0)
      {
            if(x_op == XDR_ENCODE)
                  buf[rem] = *value ;
            else
                  *value = buf[rem] ;
      
            rem++ ;
            value++ ;
      }

      if(x_op == XDR_ENCODE)
      {
            if( !xdr_setpos(xdrs, origin) )
                  return(FALSE) ;
            if( !xdr_opaque(xdrs, buf, 4))
                  return(FALSE) ;
      }

      return(TRUE) ;
}


/* xdrshorts.c */
/* you may wish to tune this: big on a cray, small on a PC? */
#define NC_SHRT_BUFSIZ 8192
#define NC_NSHRTS_PER (NC_SHRT_BUFSIZ/2) /* number of netshorts the buffer holds */

/*
 * xdr a short leaving adjoining short within the word ok.
 * (minimum unit of io is 4 bytes)
 */
static bool_t
xdr_NCvshort(XDR *xdrs, unsigned which, short *value)
{
      unsigned char buf[4] ; /* unsigned is important here */
      u_int origin ;
      enum xdr_op  x_op = xdrs->x_op ; /* save state */

      if(x_op == XDR_ENCODE)
      {
            origin = xdr_getpos( xdrs ) ;
            /* next op is a get */
            xdrs->x_op = XDR_DECODE ;
      }

      if(!xdr_opaque(xdrs, (caddr_t)buf, 4))
      {
            /* get failed, assume we are trying to read off the end */
            (void)memset(buf, 0, sizeof(buf)) ;
      }

      if(x_op == XDR_ENCODE) /* back to encode */
            xdrs->x_op = x_op ;

      if(which != 0) which = 2 ;

      if(xdrs->x_op == XDR_ENCODE)
      {
            buf[which +1] = *value % 256 ;
            buf[which] = (*value >> 8) ;

            if( !xdr_setpos(xdrs, origin) )
                  return(FALSE) ;
            if( !xdr_opaque(xdrs, (caddr_t)buf, 4))
                  return(FALSE) ;
      }
      else
      {
            *value = (((unsigned)buf[which] & 0x7f) << 8) +
                   (unsigned)buf[which + 1] ;
            if((unsigned)buf[which] & 0x80)
            {
                  /* extern is neg */
                  *value -= 0x8000 ;
            }
      }
      return(TRUE) ;
}

/*
 * internal function, bulk xdr of an even number of shorts, less than NC_NSHRTS_PER
 */
static
bool_t
NCxdr_shortsb(XDR *xdrs, short *sp, u_int nshorts)
{
      unsigned char buf[NC_SHRT_BUFSIZ] ;
      unsigned char *cp ;
      unsigned int nbytes = nshorts * 2;

      /* assert(nshorts <= NC_NSHRTS_PER) ; */
      /* assert(nshorts > 0) ; */

      if(xdrs->x_op == XDR_ENCODE)
      {
            for(cp = buf ; cp < &buf[nbytes] ; sp++, cp += 2 )
            {
                  *(cp +1) = *sp % 256 ;
                  *cp = (*sp >> 8) ;
            }
      }

      if(!xdr_opaque(xdrs, (caddr_t)buf, nbytes))
            return FALSE ;
      
      if(xdrs->x_op == XDR_DECODE)
      {
            for(cp = buf ; cp < &buf[nbytes] ; sp++, cp += 2 )
            {
                  *sp = (((unsigned)*cp & 0x7f) << 8) +
                         (unsigned)*(cp +1) ;
                  if((unsigned)*cp & 0x80)
                  {
                        /* extern is neg */
                        *sp -= 0x8000 ;
                  }
            }
      }

      return TRUE ;
}


/*
 * Translate an array of cnt short integers at sp.
 */
bool_t
xdr_shorts(XDR *xdrs, short *sp, u_int cnt)
{
      int odd ; /* 1 if cnt is odd, 0 otherwise */

      if(cnt == 0)
            return TRUE ;     /* ? */

      odd = cnt % 2 ;
      if(odd) 
            cnt-- ;
      /* cnt is even, odd is set if apropos */

      while(cnt > NC_NSHRTS_PER)
      {
            if(!NCxdr_shortsb(xdrs, sp, NC_NSHRTS_PER))
                  return FALSE ;
            /* else */
            sp += NC_NSHRTS_PER ;
            cnt -= NC_NSHRTS_PER ;
      }

      /* we know cnt <= NC_NSHRTS_PER at this point */

      if(cnt != 0)
      {
            if(!NCxdr_shortsb(xdrs, sp, cnt))
                  return FALSE ;
            /* else */
            sp += cnt ;
            cnt = 0 ;
      }

      if(odd)
            if(!xdr_NCvshort(xdrs, 0, sp))
                  return FALSE ;

      return TRUE ;
}

/*
 * Use standard xdr interface (plus the netcdf xdr_shorts())
 * to encode data to 'buf'
 * Returns 0 on success.
 */
static int
xdr_encode(char *buf, u_int sz)
{
      XDR xdrs[1];
      u_int pos;
      int ii;

      xdrmem_create(xdrs, buf, sz, XDR_ENCODE);

      if(!xdr_opaque(xdrs, (caddr_t)text, (u_int)sizeof(text)))
            return 1;

      if(!xdr_opaque(xdrs, (caddr_t)schars, (u_int)sizeof(schars)))
            return 2;

      if(!xdr_shorts(xdrs, shorts, uiArraySize(shorts)))
            return 3;

      if(!xdr_vector(xdrs, (char *)ints,
                  uiArraySize(ints), eSizeOf(ints),
                  (xdrproc_t)xdr_int))
            return 4;

      /* double the ints to check both ncx_ interfaces */
      if(!xdr_vector(xdrs, (char *)ints,
                  uiArraySize(ints), eSizeOf(ints),
                  (xdrproc_t)xdr_int))
            return 5;

#ifndef NO_UNSIGNED
      if(!xdr_vector(xdrs, (char *)u_ints,
                  uiArraySize(u_ints), eSizeOf(u_ints),
                  (xdrproc_t)xdr_u_int))
            return 6;
#endif

      if(!xdr_vector(xdrs, (char *)longs,
                  uiArraySize(longs), eSizeOf(longs),
                  (xdrproc_t)xdr_long))
            return 7;

#ifndef NO_UNSIGNED_LONG
      if(!xdr_vector(xdrs, (char *)u_longs,
                  uiArraySize(u_longs), eSizeOf(u_longs),
                  (xdrproc_t)xdr_u_long))
            return 9;
#endif

      if(!xdr_vector(xdrs, (char *)floats,
                  uiArraySize(floats), eSizeOf(floats),
                  (xdrproc_t)xdr_float))
            return 10;

      if(!xdr_vector(xdrs, (char *)doubles,
                  uiArraySize(doubles), eSizeOf(doubles),
                  (xdrproc_t)xdr_double))
            return 11;

      /* mix it up */
      for(ii = 1; ii < 5; ii++)
      {
            if(
                        !xdr_opaque(xdrs, (caddr_t)text, ii)
                        || !xdr_shorts(xdrs, shorts, ii)
                        || !xdr_opaque(xdrs, (caddr_t)schars, ii)
            )
                  return (11 + ii);
      }

      /*
       * Test non-aligned unit ops used by netcdf.
       */

      for(ii = 1; ii < 5; ii++)
      {
            pos = xdr_getpos(xdrs);
            if(!xdr_NCvbyte(xdrs, ii, BYTES_PER_XDR_UNIT -ii, &text[ii]))
                  return (15 + ii);
            if(!xdr_setpos(xdrs, pos + BYTES_PER_XDR_UNIT))
                  return (15 + ii);
      }

      for(ii = 1; ii < 5; ii++)
      {
            pos = xdr_getpos(xdrs);
            if(!xdr_NCvbyte(xdrs, ii, BYTES_PER_XDR_UNIT -ii,
                        (char *)&schars[ii]))
                  return (19 + ii);
            if(!xdr_setpos(xdrs, pos + BYTES_PER_XDR_UNIT))
                  return (18 + ii);
      }

      for(ii = 1; ii < 3; ii++)
      {
            pos = xdr_getpos(xdrs);
            if(!xdr_NCvshort(xdrs, ii%2, &shorts[ii]))
                  return (23 + ii);
            if(!xdr_setpos(xdrs, pos + BYTES_PER_XDR_UNIT))
                  return (23 + ii);
      }

      pos = xdr_getpos(xdrs);
      (void) printf("xdr_encode ends at byte %u\n", pos);

      return 0;
}


static int
cmp_chars(const char *c1, const char *c2, size_t nchars)
{
      int status = 0;
      const char *const end = c1 + nchars;

      while(c1 < end)
      {
            if(*c1 != *c2)
            {
                  (void) fprintf(stderr,
                              "%c != %c char\n",
                              *c1,
                              *c2);
                  if(status == 0)
                        status = *c2 < *c1 ? -1 : 1;
            }
            c1++, c2++;
      }

      return status;
}

static int
cmp_schars(const schar *b1, const schar *b2, size_t nbytes)
{
      int status = 0;
      const schar *const end = b1 + nbytes;

      while(b1 < end)
      {
            if(*b1 != *b2)
            {
                  (void) fprintf(stderr,
                              "0x%02x != 0x%02x byte\n",
                              (unsigned)(*b1),
                              (unsigned)(*b2));
                        
                  if(status == 0)
                        status = *b2 < *b1 ? -1 : 1;
            }
            b1++, b2++;
      }

      return status;
}

static int
cmp_shorts(const short *s1, const short *s2, size_t nshorts)
{
      int status = 0;
      const short *const end = s1 + nshorts;

      while(s1 < end)
      {
            if(*s1 != *s2)
            {
                  (void) fprintf(stderr,
                              "0x%04x != 0x%04x (%hd) short\n",
                              (unsigned)(*s1),
                              (unsigned)(*s2), *s2);
                  if(status == 0)
                        status = *s2 < *s1 ? -1 : 1;
            }
            s1++, s2++;
      }

      return status;
}

static int
cmp_ints(const int *i1, const int *i2, size_t nints)
{
      int status = 0;
      const int *const end = i1 + nints;

      while(i1 < end)
      {
            if(*i1 != *i2)
            {
                  (void) fprintf(stderr,
                              "0x%08x != 0x%08x int\n",
                              (unsigned)(*i1),
                              (unsigned)(*i2));
                  if(status == 0)
                        status = *i2 < *i1 ? -1 : 1;
            }
            i1++, i2++;
      }

      return status;
}

#ifndef NO_UNSIGNED
static int
cmp_u_ints(const unsigned int *i1, const unsigned int *i2, size_t nints)
{
      int status = 0;
      const unsigned int *const end = i1 + nints;

      while(i1 < end)
      {
            if(*i1 != *i2)
            {
                  (void) fprintf(stderr,
                              "(%u) 0x%08x != 0x%08x (%u) uint\n",
                              *i1, *i1,
                              *i2, *i2);
                  if(status == 0)
                        status = *i2 < *i1 ? -1 : 1;
            }
            i1++, i2++;
      }

      return status;
}
#endif

static int
cmp_longs(const long *l1, const long *l2, size_t nlongs)
{
      int status = 0;
      const long *const end = l1 + nlongs;

      while(l1 < end)
      {
            if(*l1 != *l2)
            {
                  (void) fprintf(stderr,
                              "0x%016lx != 0x%016lx long\n",
                              (unsigned long)(*l1),
                              (unsigned long)(*l2));
                  if(status == 0)
                        status = *l2 < *l1 ? -1 : 1;
            }
            l1++, l2++;
      }

      return status;
}

#ifndef NO_UNSIGNED_LONG
static int
cmp_u_longs(const unsigned long *l1, const unsigned long *l2, size_t nlongs)
{
      int status = 0;
      const unsigned long *const end = l1 + nlongs;

      while(l1 < end)
      {
            if(*l1 != *l2)
            {
                  (void) fprintf(stderr,
                              "0x%016lx != 0x%016lx ulong\n",
                              *l1,
                              *l2);
                  if(status == 0)
                        status = *l2 < *l1 ? -1 : 1;
            }
            l1++, l2++;
      }

      return status;
}
#endif

static int
cmp_floats(const float *f1, const float *f2, size_t nfloats)
{
#define F_EPS 1.0e-6

      int status = 0;
      const float *const end = f1 + nfloats;

      while(f1 < end)
      {
            if(*f1 < *f2 && *f2 - *f1 > F_EPS)
            {
                  (void) fprintf(stderr,
                              "%.9e != %.9e float (diff %.9e)\n",
                              *f1, *f2, *f1 - *f2);
                  if(status == 0)
                        status = 1;
            }
            else if( *f2 < *f1 && *f1 - *f2 > F_EPS)
            {
                  (void) fprintf(stderr,
                              "%.9e != %.9e float (diff %.9e)\n",
                              *f1, *f2, *f1 - *f2);
                  if(status == 0)
                        status = -1;
            }
            f1++, f2++;
      }

      return status;
}

static int
cmp_doubles(const double *d1, const double *d2, size_t ndoubles)
{
#define D_EPS 1.0e-15

      int status = 0;
      const double *const end = d1 + ndoubles;

      while(d1 < end)
      {
            if(*d1 < *d2 && *d2 - *d1 > D_EPS)
            {
                  (void) fprintf(stderr,
                              "%.17e != %.17e double (diff %.17e)\n",
                              *d1, *d2, *d1 - *d2);
                  if(status == 0)
                        status = 1;
            }
            else if( *d2 < *d1 && *d1 - *d2 > D_EPS)
            {
                  (void) fprintf(stderr,
                              "%.17e != %.17e double (diff %.17e)\n",
                              *d1, *d2, *d1 - *d2);
                  if(status == 0)
                        status = -1;
            }
            d1++, d2++;
      }

      return status;
}

/*
 * Verify that data in buf is as encoded
 * by xdr_encode() above.
 * Returns zero on sucess.
 */
static int
xdr_check(char *buf, u_int sz)
{
      XDR xdrs[1];
      char tbuf[XBSZ];
      u_int pos;
      int ii;
      int jj;

      xdrmem_create(xdrs, buf, sz, XDR_DECODE);

      (void) memset(tbuf, 0, sizeof(text)+4);
      if(!xdr_opaque(xdrs, (caddr_t)tbuf, (u_int)sizeof(text))
                  || cmp_chars(tbuf, text,
                         sizeof(text)) != 0)
            return 1;

      (void) memset(tbuf, 0, sizeof(schars)+4);
      if(!xdr_opaque(xdrs, (caddr_t)tbuf, (u_int)sizeof(schars))
                  || cmp_schars((schar *)tbuf, schars,
                        sizeof(schars)) != 0)
            return 2;

      (void) memset(tbuf, 0, sizeof(shorts)+4);
      if(!xdr_shorts(xdrs, (short *)tbuf, uiArraySize(shorts))
                  || cmp_shorts((short *)tbuf, shorts,
                         ArraySize(shorts)) != 0)
            return 3;

      (void) memset(tbuf, 0, sizeof(ints)+4);
      if(!xdr_vector(xdrs, tbuf,
            uiArraySize(ints), eSizeOf(ints),
            (xdrproc_t)xdr_int)
                  || cmp_ints((int *)tbuf, ints,
                         ArraySize(ints)) != 0)
            return 4;

      /* double the ints to check both ncx_ interfaces */
      (void) memset(tbuf, 0, sizeof(ints)+4);
      if(!xdr_vector(xdrs, tbuf,
            uiArraySize(ints), eSizeOf(ints),
            (xdrproc_t)xdr_int)
                  || cmp_ints((int *)tbuf, ints,
                         ArraySize(ints)) != 0)
            return 5;

#ifndef NO_UNSIGNED
      (void) memset(tbuf, 0, sizeof(u_ints)+4);
      if(!xdr_vector(xdrs, tbuf,
            uiArraySize(u_ints), eSizeOf(u_ints),
            (xdrproc_t)xdr_u_int)
                  || cmp_u_ints((unsigned int *)tbuf, u_ints,
                        ArraySize(u_ints)) != 0)
            return 6;
#endif

      (void) memset(tbuf, 0, sizeof(longs)+4);
      if(!xdr_vector(xdrs, tbuf,
            uiArraySize(longs), eSizeOf(longs), (xdrproc_t)xdr_long)
                  || cmp_longs((long *)tbuf, longs,
                         ArraySize(longs)) != 0)
            return 7;

#ifndef NO_UNSIGNED_LONG
      (void) memset(tbuf, 0, sizeof(u_longs)+4);
      if(!xdr_vector(xdrs, tbuf,
            uiArraySize(u_longs), eSizeOf(u_longs), (xdrproc_t)xdr_u_long)
                  || cmp_u_longs((unsigned long *)tbuf, u_longs,
                        ArraySize(u_longs)) != 0)
            return 9;
#endif

      (void) memset(tbuf, 0, sizeof(floats)+4);
      if(!xdr_vector(xdrs, tbuf,
            uiArraySize(floats), eSizeOf(floats), (xdrproc_t)xdr_float)
                  || cmp_floats((float *)tbuf, floats,
                         ArraySize(floats)) != 0)
            return 10;

      (void) memset(tbuf, 0, sizeof(doubles)+4);
      if(!xdr_vector(xdrs, tbuf,
            uiArraySize(doubles), eSizeOf(doubles), (xdrproc_t)xdr_double)
                  || cmp_doubles((double *)tbuf, doubles,
                         ArraySize(doubles)) != 0)
            return 11;

      for(ii = 1; ii < 5; ii++)
      {
            char tx[4];
            short sh[4];
            schar by[4];
            if(
                        !xdr_opaque(xdrs, (caddr_t)tx, ii)
                        || !xdr_shorts(xdrs, sh, ii)
                        || !xdr_opaque(xdrs, (caddr_t)by, ii)
            )
                  return (11 + ii);
            for(jj = 0; jj < ii; jj++)
            {
                  if(tx[jj] != text[jj])
                  {
                        (void) fprintf(stderr, "\txdr %c != %c text[%d]\n",
                                    tx[jj], text[jj], jj);
                        return (11 + ii);
                  }
                  /* else */
                  if(sh[jj] != shorts[jj])
                  {
                        (void) fprintf(stderr, "\txdr %hd != %hd shorts[%d]\n",
                                    sh[jj], shorts[jj], jj);
                        return (11 + ii);
                  }
                  /* else */
                  if(by[jj] != schars[jj])
                  {
                        (void) fprintf(stderr,
                              "\txdr 0x%02x != 0x%02x schars[%d]\n",
                                    (unsigned) by[jj],
                                    (unsigned) schars[jj], jj);
                        return (11 + ii);
                  }
                  /* else */
            }
      }

      /*
       * Test non-aligned unit ops used by netcdf.
       */

      for(ii = 1; ii < 5; ii++)
      {
            pos = xdr_getpos(xdrs);
            (void) memset(tbuf, 0, BYTES_PER_XDR_UNIT);
            if(!xdr_NCvbyte(xdrs, ii, BYTES_PER_XDR_UNIT -ii, tbuf)
                        || cmp_chars(&text[ii], tbuf,
                              BYTES_PER_XDR_UNIT -ii) != 0)
                  return (15 + ii);
            if(!xdr_setpos(xdrs, pos + BYTES_PER_XDR_UNIT))
                  return (15 + ii);
      }

      for(ii = 1; ii < 5; ii++)
      {
            pos = xdr_getpos(xdrs);
            (void) memset(tbuf, 0, BYTES_PER_XDR_UNIT);
            if(!xdr_NCvbyte(xdrs, ii, BYTES_PER_XDR_UNIT -ii, tbuf)
                        || cmp_schars((schar *)tbuf, &schars[ii],
                              BYTES_PER_XDR_UNIT -ii) != 0)
                  return (19 + ii);
            if(!xdr_setpos(xdrs, pos + BYTES_PER_XDR_UNIT))
                  return (19 + ii);
      }

      for(ii = 1; ii < 3; ii++)
      {
            pos = xdr_getpos(xdrs);
            (void) memset(tbuf, 0, BYTES_PER_XDR_UNIT);
            if(!xdr_NCvshort(xdrs, ii%2, (short *)tbuf)
                        || cmp_shorts((short *)tbuf, &shorts[ii], 1))
                  return (23 + ii);
            if(!xdr_setpos(xdrs, pos + BYTES_PER_XDR_UNIT))
                  return (23 + ii);
      }

      pos = xdr_getpos(xdrs);
      (void) printf("xdr_check  ends at byte %u\n", pos);

      return 0;
}


/* Poor man's template */
#define NCX_VEC(xpp, nn, vecp, TYPE, proc, step) \
{ \
\
      size_t nelems = (nn); \
      TYPE *elemp = (vecp); \
\
      while(nelems != 0) \
      { \
            status = (proc)((*(xpp)), elemp); \
            if(status != ENOERR) \
                  break; \
            (*(xpp)) = (void *)((char *)(*(xpp)) + (step)); \
            elemp ++; \
            nelems--; \
      } \
}


/*
 * Use ncx interface
 * to encode data to 'buf'
 * Returns zero on success.
 */
static int
ncx_encode(char *buf)
{
      int status = ENOERR;

      void *vp = buf;
      int ii;

      if(ncx_pad_putn_text(&vp, sizeof(text), text))
            return 1;

      if(ncx_pad_putn_schar_schar(&vp, sizeof(schars), schars))
            return 2;

      if(ncx_pad_putn_short_short(&vp, ArraySize(shorts), shorts))
            return 3;

      if(ncx_putn_int_int(&vp, ArraySize(ints), ints))
            return 4;

      NCX_VEC(&vp, ArraySize(ints), ints,
                  int, ncx_put_int_int, X_SIZEOF_INT);
      if(status != ENOERR)
            return 5;

#ifndef NO_UNSIGNED
      NCX_VEC(&vp, ArraySize(u_ints), u_ints,
                  unsigned int, ncx_put_uint_uint, X_SIZEOF_INT);
      if(status != ENOERR)
            return 6;
#endif

      if(ncx_putn_int_long(&vp, ArraySize(longs), longs))
            return 7;

#ifndef NO_UNSIGNED_LONG
      NCX_VEC(&vp, ArraySize(u_longs), u_longs,
                  unsigned long, ncx_put_ulong_ulong, X_SIZEOF_LONG);
      if(status != ENOERR)
            return 9;
#endif

      if(ncx_putn_float_float(&vp, ArraySize(floats), floats))
            return 10;

      if(ncx_putn_double_double(&vp, ArraySize(doubles), doubles))
            return 11;

      /* mix it up */
      for(ii = 1; ii < 5; ii++)
      {
            if(
                        ncx_pad_putn_text(&vp, ii, text)
                        || ncx_pad_putn_short_short(&vp, ii, shorts)
                        || ncx_pad_putn_schar_schar(&vp, ii, schars)
            )
                  return (11 + ii);
      }

      /*
       * Test non-aligned unit ops used by netcdf.
       */

      for(ii = 1; ii < 5; ii++)
      {
            vp = (char *)vp + ii;
            if(ncx_putn_text(&vp, X_ALIGN - ii, &text[ii]))
                  return (15 + ii);
      }

      for(ii = 1; ii < 5; ii++)
      {
            vp = (char *)vp + ii;
            if(ncx_putn_schar_schar(&vp, X_ALIGN - ii, &schars[ii]))
                  return (19 + ii);
      }

      for(ii = 1; ii < 3; ii++)
      {
            char *pos = vp;
            vp = (char *)vp + (ii%2) * 2;
            if(ncx_putn_short_short(&vp, 1, &shorts[ii]))
                  return (23 + ii);
            vp = pos + X_ALIGN;
      }

      (void) printf("ncx_encode ends at byte %u\n",
             (unsigned)(((char *)vp) - buf));

      return 0;
}

/* 
 * Verify the ncx_getn_xxx() routines.
 * Returns zero on success.
 */
static int
ncx_check(char *buf)
{
      int status = ENOERR;
      const void *vp = buf;
      char tbuf[XBSZ];
      int ii;
      int jj;

      (void) memset(tbuf, 0, sizeof(text)+4);
      if(ncx_pad_getn_text(&vp, sizeof(text), tbuf)
                  || cmp_chars(tbuf, text,
                         sizeof(text)) != 0)
            return 1;

      (void) memset(tbuf, 0, sizeof(schars)+4);
      if(ncx_pad_getn_schar_schar(&vp, sizeof(schars), (schar *)tbuf)
                  || cmp_schars((schar *)tbuf, schars,
                         sizeof(schars)) != 0)
            return 2;

      (void) memset(tbuf, 0, sizeof(shorts)+4);
      if(ncx_pad_getn_short_short(&vp, ArraySize(shorts), (short *)tbuf)
                  || cmp_shorts((short *)tbuf, shorts,
                         ArraySize(shorts)) != 0)
            return 3;

      (void) memset(tbuf, 0, sizeof(ints)+4);
      if(ncx_getn_int_int(&vp, ArraySize(ints), (int *)tbuf)
                  || cmp_ints((int *)tbuf, ints,
                         ArraySize(ints)) != 0)
            return 4;

      (void) memset(tbuf, 0, sizeof(ints)+4);
      NCX_VEC(&vp, ArraySize(ints), (int *)tbuf,
                        int, ncx_get_int_int, X_SIZEOF_INT);
      if(status != ENOERR
                  || cmp_ints((int *)tbuf, ints,
                         ArraySize(ints)) != 0)
            return 5;

#ifndef NO_UNSIGNED
      (void) memset(tbuf, 0, sizeof(u_ints)+4);
      NCX_VEC(&vp, ArraySize(u_ints), (unsigned int *)tbuf,
                        unsigned, ncx_get_uint_uint, X_SIZEOF_INT);
      if(status != ENOERR
                  || cmp_u_ints((unsigned int *)tbuf, u_ints,
                         ArraySize(u_ints)) != 0)
            return 6;
#endif

      (void) memset(tbuf, 0, sizeof(longs)+4);
      if(ncx_getn_int_long(&vp, ArraySize(longs), (long *)tbuf)
                  || cmp_longs((long *)tbuf, longs,
                         ArraySize(longs)) != 0)
            return 7;

#ifndef NO_UNSIGNED_LONG
      (void) memset(tbuf, 0, sizeof(u_longs)+4);
      NCX_VEC(&vp, ArraySize(u_longs), (unsigned long *)tbuf,
                  unsigned long, ncx_get_ulong_ulong, X_SIZEOF_LONG);
      if(status != ENOERR
                  || cmp_u_longs((unsigned long *)tbuf, u_longs,
                        ArraySize(u_longs)) != 0)
            return 9;
#endif

      (void) memset(tbuf, 0, sizeof(floats)+4);
      if(ncx_getn_float_float(&vp, ArraySize(floats), (float *)tbuf)
                  || cmp_floats((float *)tbuf, floats,
                         ArraySize(floats)) != 0)
            return 10;

      (void) memset(tbuf, 0, sizeof(doubles)+4);
      if(ncx_getn_double_double(&vp, ArraySize(doubles), (double *)tbuf)
                  || cmp_doubles((double *)tbuf, doubles,
                         ArraySize(doubles)) != 0)
            return 11;

      for(ii = 1; ii < 5; ii++)
      {
            char tx[4];
            short sh[4];
            schar by[4];
            if(
                        ncx_pad_getn_text(&vp, ii, tx)
                        || ncx_pad_getn_short_short(&vp, ii, sh)
                        || ncx_pad_getn_schar_schar(&vp, ii, by)
            )
                  return (11 + ii);
            for(jj = 0; jj < ii; jj++)
            {
                  if(tx[jj] != text[jj])
                  {
                        (void) fprintf(stderr,
                              "\tncx %c != %c text[%d]\n",
                                    tx[jj], text[jj], jj);
                        return (11 + ii);
                  }
                  /* else */
                  if(sh[jj] != shorts[jj])
                  {
                        (void) fprintf(stderr,
                               "\tncx %hd != %hd shorts[%d]\n",
                                    sh[jj], shorts[jj], jj);
                        return (11 + ii);
                  }
                  /* else */
                  if((unsigned)by[jj] != (unsigned)schars[jj])
                  {
                        (void) fprintf(stderr,
                              "\tncx 0x%02x != 0x%02x schars[%d] %d\n",
                                    by[jj], schars[jj], jj, ii);
                        return (11 + ii);
                  }
            }
      }

      /*
       * Test non-aligned unit ops used by netcdf.
       */

      for(ii = 1; ii < 5; ii++)
      {
            (void) memset(tbuf, 0, X_ALIGN);
            vp = (char *)vp + ii;
            if(ncx_getn_text(&vp, X_ALIGN -ii, tbuf)
                        || cmp_chars(tbuf, &text[ii],
                               X_ALIGN -ii) != 0)
                  return (15 + ii);
      }

      for(ii = 1; ii < 5; ii++)
      {
            (void) memset(tbuf, 0, X_ALIGN);
            vp = (char *)vp + ii;
            if(ncx_getn_schar_schar(&vp, X_ALIGN -ii, (schar *)tbuf)
                        || cmp_schars((schar *)tbuf, &schars[ii],
                               X_ALIGN -ii) != 0)
                  return (19 + ii);
      }

      for(ii = 1; ii < 3; ii++)
      {
            const char *pos = vp;
            (void) memset(tbuf, 0, X_ALIGN);
            vp = (char *)vp + (ii%2) *2;
            if(ncx_getn_short_short(&vp, 1, (short *)tbuf)
                        || cmp_shorts((short *)tbuf, &shorts[ii],
                               1) != 0)
                  return (23 + ii);
            vp = pos + X_ALIGN;
      }

      (void) printf("ncx_check  ends at byte %u\n",
             (unsigned)(((char *)vp) - buf));


      return 0;
}


int
main(int ac, char *av[])
{
      int status;

      status = xdr_encode(xdrb, sizeof(xdrb));
      if(status)
      {
            (void) fprintf(stderr,
                   "xdr_encode failed %d\n", status);
            return 1;
      }

      status = xdr_check(xdrb, sizeof(xdrb));
      if(status)
      {
            (void) fprintf(stderr,
                   "xdr_check of xdrb failed %d\n", status);
            return 1;
      }

      status = ncx_encode(ncxb);
      if(status)
      {
            (void) fprintf(stderr,
                   "ncx_encode failed %d\n", status);
            return 1;
      }

      /* cross check */
      status = xdr_check(ncxb, sizeof(ncxb));
      if(status)
      {
            (void) fprintf(stderr,
                   "xdr_check of ncxb failed %d\n", status);
            return 1;
      }

      status = ncx_check(xdrb);
      if(status)
      {
            (void) fprintf(stderr,
                   "ncx_check of xdrb failed %d\n", status);
            return 1;
      }

      status = ncx_check(ncxb);
      if(status)
      {
            (void) fprintf(stderr,
                   "ncx_check of ncxb failed %d\n", status);
            return 1;
      }

      return 0;
}

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