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/*
* Copyright 1993, University Corporation for Atmospheric Research
* See netcdf/COPYRIGHT file for copying and redistribution conditions.
*/
/* $Id: string.c,v 1.12 1997/11/05 19:40:32 koziol Exp $ */
#include <string.h>
#include "local_nc.h"
#include "alloc.h"
#ifdef HDF
static uint32
compute_hash(unsigned count,
const char *str)
{
uint32 ret=0;
uint32 temp;
/* check if string is NULL */
if (str == NULL)
return ret;
while(count > sizeof(uint32))
{
HDmemcpy(&temp,str,sizeof(uint32));
ret += temp;
str += sizeof(uint32);
count -= sizeof(uint32);
} /* end while */
if(count > 0)
{
temp=0;
HDmemcpy(&temp,str,count);
ret+=temp;
} /* end if */
return(ret);
} /* end compute_hash() */
#endif /* HDF */
NC_string *
NC_new_string(count, str)
unsigned count ;
const char *str ;
{
NC_string *ret ;
size_t memlen ;
if(count > MAX_NC_NAME)
{
NCadvise(NC_EMAXNAME,
"string \"%c%c%c%c%c%c ...\" length %d exceeds %d",
str[0], str[1], str[2], str[3], str[4], str[5],
count, MAX_NC_NAME ) ;
return NULL ;
}
ret = (NC_string *)HDmalloc(sizeof(NC_string)) ;
if( ret == NULL )
goto alloc_err ;
ret->count = count ;
ret->len = count ;
#ifdef HDF
ret->hash = compute_hash(count,str);
#endif /* HDF */
if(count != 0 ) /* allocate */
{
memlen = count + 1 ;
ret->values = (char *)HDmalloc(memlen) ;
if(ret->values == NULL)
goto alloc_err ;
if(str != NULL)
{
#ifdef HDF
memcpy(ret->values, str, (size_t)count) ;
#else
(void)strncpy(ret->values, str, count) ;
#endif
ret->values[count] = 0 ;
}
} else { /* use what what you were given */
ret->values = NULL ;
}
return(ret) ;
alloc_err :
nc_serror("NC_new_string") ;
if(ret != NULL) HDfree(ret) ;
return(NULL) ;
}
/*
* Free string, and, if needed, its values.
*
* NOTE: Changed return value to return 'int'
* If successful returns SUCCEED else FAIL -GV 9/19/97
*/
int
NC_free_string(cdfstr)
NC_string *cdfstr ;
{
int ret_value = SUCCEED;
if(cdfstr != NULL)
{
if(cdfstr->values != NULL)
Free(cdfstr->values) ;
Free(cdfstr) ;
}
#ifdef LATER
done:
if (ret_value == FAIL)
{ /* Failure cleanup */
}
/* Normal cleanup */
#endif /* LATER */
return ret_value;
}
NC_string *
NC_re_string(old, count, str)
NC_string *old ;
unsigned count ;
const char *str ;
{
if(old->count < count) /* punt */
{
NCadvise(NC_ENOTINDEFINE,
"Must be in define mode to increase name length %d",
old->count) ;
return(NULL) ;
}
if (str == NULL)
return NULL;
(void)memcpy(old->values, str, count) ;
(void)memset(old->values + count, 0, (int)old->count - (int)count +1) ;
/* make sure len is always == to the string length */
old->len = count ;
#ifdef HDF
old->hash = compute_hash(count,str);
#endif /* HDF */
return(old) ;
}
bool_t
xdr_NC_string(xdrs, spp)
XDR *xdrs;
NC_string **spp;
{
u_long count ;
int status ;
switch (xdrs->x_op) {
case XDR_FREE:
NC_free_string((*spp)) ;
return(TRUE) ;
case XDR_DECODE:
/* need the length to pass to new */
if (! xdr_u_long(xdrs, &count)) {
return (FALSE);
}
if( count == 0)
{
*spp = NULL ;
return(TRUE) ;
} /* else */
(*spp) = NC_new_string((unsigned)count, (const char *)NULL) ;
if((*spp) == NULL)
return(FALSE) ;
(*spp)->values[count] = 0 ;
/* then deal with the characters */
status = xdr_opaque(xdrs, (*spp)->values, (*spp)->count);
/* might be padded */
(*spp)->len = strlen((*spp)->values);
return(status);
case XDR_ENCODE:
/* first deal with the length */
if(*spp == NULL)
{
count = 0 ;
return( xdr_u_long(xdrs, &count) ) ;
} /* else */
count = (*spp)->count ;
if (! xdr_u_long(xdrs, &count) ) {
return (FALSE);
}
/* then deal with the characters */
return (xdr_opaque(xdrs, (*spp)->values, (*spp)->count));
}
return(FALSE) ;
}
/*
* How much space will the xdr'd string take.
*
*/
int NC_xlen_string(cdfstr)
NC_string *cdfstr ;
{
int len = 4 ;
int rem ;
if(cdfstr!=NULL)
{
len += cdfstr->count ;
if( (rem = len%4) != 0)
len += 4 - rem ;
}
return(len) ;
}
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