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postgresql/src/backend/utils/adt/arrayfuncs.c

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/*-------------------------------------------------------------------------
*
* arrayfuncs.c
* Support functions for arrays.
*
* Portions Copyright (c) 1996-2000, PostgreSQL, Inc
* Portions Copyright (c) 1994, Regents of the University of California
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/utils/adt/arrayfuncs.c,v 1.64 2000/07/27 03:50:52 tgl Exp $
*
*-------------------------------------------------------------------------
*/
#include <ctype.h>
#include "postgres.h"
#include "catalog/catalog.h"
#include "catalog/pg_type.h"
#include "utils/array.h"
#include "utils/memutils.h"
#include "utils/syscache.h"
/*
* An array has the following internal structure:
* <nbytes> - total number of bytes
* <ndim> - number of dimensions of the array
* <flags> - bit mask of flags
* <dim> - size of each array axis
* <dim_lower> - lower boundary of each dimension
* <actual data> - whatever is the stored data
* The actual data starts on a MAXALIGN boundary.
*
* NOTE: it is important that array elements of toastable datatypes NOT be
* toasted, since the tupletoaster won't know they are there. (We could
* support compressed toasted items; only out-of-line items are dangerous.
* However, it seems preferable to store such items uncompressed and allow
* the toaster to compress the whole array as one input.)
*/
/* ----------
* Local definitions
* ----------
*/
#ifndef MIN
#define MIN(a,b) (((a)<(b)) ? (a) : (b))
#endif
#ifndef MAX
#define MAX(a,b) (((a)>(b)) ? (a) : (b))
#endif
#define ASSGN "="
#define RETURN_NULL(type) do { *isNull = true; return (type) 0; } while (0)
static int ArrayCount(char *str, int *dim, int typdelim);
static Datum *ReadArrayStr(char *arrayStr, int nitems, int ndim, int *dim,
FmgrInfo *inputproc, Oid typelem, int32 typmod,
char typdelim, int typlen, bool typbyval,
char typalign, int *nbytes);
static void CopyArrayEls(char *p, Datum *values, int nitems,
bool typbyval, int typlen, char typalign,
bool freedata);
static void system_cache_lookup(Oid element_type, bool input, int *typlen,
bool *typbyval, char *typdelim, Oid *typelem,
Oid *proc, char *typalign);
static Datum ArrayCast(char *value, bool byval, int len);
static int ArrayCastAndSet(Datum src, bool typbyval, int typlen, char *dest);
static int array_nelems_size(char *ptr, int eltsize, int nitems);
static char *array_seek(char *ptr, int eltsize, int nitems);
static int array_copy(char *destptr, int eltsize, int nitems, char *srcptr);
static int array_slice_size(int ndim, int *dim, int *lb, char *arraydataptr,
int eltsize, int *st, int *endp);
static void array_extract_slice(int ndim, int *dim, int *lb,
char *arraydataptr, int eltsize,
int *st, int *endp, char *destPtr);
static void array_insert_slice(int ndim, int *dim, int *lb,
char *origPtr, int origdatasize,
char *destPtr, int eltsize,
int *st, int *endp, char *srcPtr);
/*---------------------------------------------------------------------
* array_in :
* converts an array from the external format in "string" to
* its internal format.
* return value :
* the internal representation of the input array
*--------------------------------------------------------------------
*/
Datum
array_in(PG_FUNCTION_ARGS)
{
char *string = PG_GETARG_CSTRING(0); /* external form */
Oid element_type = PG_GETARG_OID(1); /* type of an array element */
int32 typmod = PG_GETARG_INT32(2); /* typmod for array elements */
int typlen;
bool typbyval,
done;
char typdelim;
Oid typinput;
Oid typelem;
char *string_save,
*p,
*q,
*r;
FmgrInfo inputproc;
int i,
nitems;
int32 nbytes;
Datum *dataPtr;
ArrayType *retval;
int ndim,
dim[MAXDIM],
lBound[MAXDIM];
char typalign;
system_cache_lookup(element_type, true, &typlen, &typbyval, &typdelim,
&typelem, &typinput, &typalign);
fmgr_info(typinput, &inputproc);
string_save = (char *) palloc(strlen(string) + 3);
strcpy(string_save, string);
/* --- read array dimensions ---------- */
p = q = string_save;
done = false;
for (ndim = 0; !done;)
{
while (isspace((int) *p))
p++;
if (*p == '[')
{
p++;
if ((r = (char *) strchr(p, ':')) == (char *) NULL)
lBound[ndim] = 1;
else
{
*r = '\0';
lBound[ndim] = atoi(p);
p = r + 1;
}
for (q = p; isdigit((int) *q); q++);
if (*q != ']')
elog(ERROR, "array_in: missing ']' in array declaration");
*q = '\0';
dim[ndim] = atoi(p);
if ((dim[ndim] < 0) || (lBound[ndim] < 0))
elog(ERROR, "array_in: array dimensions need to be positive");
dim[ndim] = dim[ndim] - lBound[ndim] + 1;
if (dim[ndim] < 0)
elog(ERROR, "array_in: upper_bound cannot be < lower_bound");
p = q + 1;
ndim++;
}
else
done = true;
}
if (ndim == 0)
{
if (*p == '{')
{
ndim = ArrayCount(p, dim, typdelim);
for (i = 0; i < ndim; i++)
lBound[i] = 1;
}
else
elog(ERROR, "array_in: Need to specify dimension");
}
else
{
while (isspace((int) *p))
p++;
if (strncmp(p, ASSGN, strlen(ASSGN)) != 0)
elog(ERROR, "array_in: missing assignment operator");
p += strlen(ASSGN);
while (isspace((int) *p))
p++;
}
#ifdef ARRAYDEBUG
printf("array_in- ndim %d (", ndim);
for (i = 0; i < ndim; i++)
{
printf(" %d", dim[i]);
};
printf(") for %s\n", string);
#endif
nitems = ArrayGetNItems(ndim, dim);
if (nitems == 0)
{
/* Return empty array */
retval = (ArrayType *) palloc(sizeof(ArrayType));
MemSet(retval, 0, sizeof(ArrayType));
retval->size = sizeof(ArrayType);
PG_RETURN_ARRAYTYPE_P(retval);
}
if (*p != '{')
elog(ERROR, "array_in: missing left brace");
dataPtr = ReadArrayStr(p, nitems, ndim, dim, &inputproc, typelem,
typmod, typdelim, typlen, typbyval, typalign,
&nbytes);
nbytes += ARR_OVERHEAD(ndim);
retval = (ArrayType *) palloc(nbytes);
MemSet(retval, 0, nbytes);
retval->size = nbytes;
retval->ndim = ndim;
memcpy((char *) ARR_DIMS(retval), (char *) dim,
ndim * sizeof(int));
memcpy((char *) ARR_LBOUND(retval), (char *) lBound,
ndim * sizeof(int));
CopyArrayEls(ARR_DATA_PTR(retval), dataPtr, nitems,
typbyval, typlen, typalign, true);
pfree(dataPtr);
pfree(string_save);
PG_RETURN_ARRAYTYPE_P(retval);
}
/*-----------------------------------------------------------------------------
* ArrayCount
* Counts the number of dimensions and the *dim array for an array string.
* The syntax for array input is C-like nested curly braces
*-----------------------------------------------------------------------------
*/
static int
ArrayCount(char *str, int *dim, int typdelim)
{
int nest_level = 0,
i;
int ndim = 0,
temp[MAXDIM];
bool scanning_string = false;
bool eoArray = false;
char *q;
for (i = 0; i < MAXDIM; ++i)
temp[i] = dim[i] = 0;
if (strncmp(str, "{}", 2) == 0)
return 0;
q = str;
while (eoArray != true)
{
bool done = false;
while (!done)
{
switch (*q)
{
case '\\':
/* skip escaped characters (\ and ") inside strings */
if (scanning_string && *(q + 1))
q++;
break;
case '\0':
/*
* Signal a premature end of the string. DZ -
* 2-9-1996
*/
elog(ERROR, "malformed array constant: %s", str);
break;
case '\"':
scanning_string = !scanning_string;
break;
case '{':
if (!scanning_string)
{
temp[nest_level] = 0;
nest_level++;
}
break;
case '}':
if (!scanning_string)
{
if (!ndim)
ndim = nest_level;
nest_level--;
if (nest_level)
temp[nest_level - 1]++;
if (nest_level == 0)
eoArray = done = true;
}
break;
default:
if (!ndim)
ndim = nest_level;
if (*q == typdelim && !scanning_string)
done = true;
break;
}
if (!done)
q++;
}
temp[ndim - 1]++;
q++;
if (!eoArray)
while (isspace((int) *q))
q++;
}
for (i = 0; i < ndim; ++i)
dim[i] = temp[i];
return ndim;
}
/*---------------------------------------------------------------------------
* ReadArrayStr :
* parses the array string pointed by "arrayStr" and converts it to
* internal format. The external format expected is like C array
* declaration. Unspecified elements are initialized to zero for fixed length
* base types and to empty varlena structures for variable length base
* types.
* result :
* returns a palloc'd array of Datum representations of the array elements.
* If element type is pass-by-ref, the Datums point to palloc'd values.
* *nbytes is set to the amount of data space needed for the array,
* including alignment padding but not including array header overhead.
*---------------------------------------------------------------------------
*/
static Datum *
ReadArrayStr(char *arrayStr,
int nitems,
int ndim,
int *dim,
FmgrInfo *inputproc,
Oid typelem,
int32 typmod,
char typdelim,
int typlen,
bool typbyval,
char typalign,
int *nbytes)
{
int i,
nest_level = 0;
Datum *values;
char *p,
*q,
*r;
bool scanning_string = false;
int indx[MAXDIM],
prod[MAXDIM];
bool eoArray = false;
mda_get_prod(ndim, dim, prod);
values = (Datum *) palloc(nitems * sizeof(Datum));
MemSet(values, 0, nitems * sizeof(Datum));
MemSet(indx, 0, sizeof(indx));
q = p = arrayStr;
/* read array enclosed within {} */
while (!eoArray)
{
bool done = false;
int i = -1;
while (!done)
{
switch (*q)
{
case '\\':
/* Crunch the string on top of the backslash. */
for (r = q; *r != '\0'; r++)
*r = *(r + 1);
break;
case '\"':
if (!scanning_string)
{
while (p != q)
p++;
p++; /* get p past first doublequote */
}
else
*q = '\0';
scanning_string = !scanning_string;
break;
case '{':
if (!scanning_string)
{
p++;
nest_level++;
if (nest_level > ndim)
elog(ERROR, "array_in: illformed array constant");
indx[nest_level - 1] = 0;
indx[ndim - 1] = 0;
}
break;
case '}':
if (!scanning_string)
{
if (i == -1)
i = ArrayGetOffset0(ndim, indx, prod);
nest_level--;
if (nest_level == 0)
eoArray = done = true;
else
{
*q = '\0';
indx[nest_level - 1]++;
}
}
break;
default:
if (*q == typdelim && !scanning_string)
{
if (i == -1)
i = ArrayGetOffset0(ndim, indx, prod);
done = true;
indx[ndim - 1]++;
}
break;
}
if (!done)
q++;
}
*q = '\0';
if (i >= nitems)
elog(ERROR, "array_in: illformed array constant");
values[i] = FunctionCall3(inputproc,
CStringGetDatum(p),
ObjectIdGetDatum(typelem),
Int32GetDatum(typmod));
p = ++q;
/*
* if not at the end of the array skip white space
*/
if (!eoArray)
while (isspace((int) *q))
{
p++;
q++;
}
}
/*
* Initialize any unset items and compute total data space needed
*/
if (typlen > 0)
{
*nbytes = nitems * typlen;
if (!typbyval)
for (i = 0; i < nitems; i++)
if (values[i] == (Datum) 0)
{
values[i] = PointerGetDatum(palloc(typlen));
MemSet(DatumGetPointer(values[i]), 0, typlen);
}
}
else
{
*nbytes = 0;
for (i = 0; i < nitems; i++)
{
if (values[i] != (Datum) 0)
{
/* let's just make sure data is not toasted */
values[i] = PointerGetDatum(PG_DETOAST_DATUM(values[i]));
if (typalign == 'd')
*nbytes += MAXALIGN(VARSIZE(DatumGetPointer(values[i])));
else
*nbytes += INTALIGN(VARSIZE(DatumGetPointer(values[i])));
}
else
{
*nbytes += sizeof(int32);
values[i] = PointerGetDatum(palloc(sizeof(int32)));
VARATT_SIZEP(DatumGetPointer(values[i])) = sizeof(int32);
}
}
}
return values;
}
/*----------
* Copy data into an array object from a temporary array of Datums.
*
* p: pointer to start of array data area
* values: array of Datums to be copied
* nitems: number of Datums to be copied
* typbyval, typlen, typalign: info about element datatype
* freedata: if TRUE and element type is pass-by-ref, pfree data values
* referenced by Datums after copying them.
*
* If the input data is of varlena type, the caller must have ensured that
* the values are not toasted. (Doing it here doesn't work since the
* caller has already allocated space for the array...)
*----------
*/
static void
CopyArrayEls(char *p,
Datum *values,
int nitems,
bool typbyval,
int typlen,
char typalign,
bool freedata)
{
int i;
int inc;
if (typbyval)
freedata = false;
for (i = 0; i < nitems; i++)
{
inc = ArrayCastAndSet(values[i], typbyval, typlen, p);
p += inc;
if (freedata)
pfree(DatumGetPointer(values[i]));
}
}
/*-------------------------------------------------------------------------
* array_out :
* takes the internal representation of an array and returns a string
* containing the array in its external format.
*-------------------------------------------------------------------------
*/
Datum
array_out(PG_FUNCTION_ARGS)
{
ArrayType *v = PG_GETARG_ARRAYTYPE_P(0);
Oid element_type = PG_GETARG_OID(1);
int typlen;
bool typbyval;
char typdelim;
Oid typoutput,
typelem;
FmgrInfo outputproc;
char typalign;
char *p,
*tmp,
*retval,
**values,
delim[2];
int nitems,
overall_length,
i,
j,
k,
#ifndef TCL_ARRAYS
l,
#endif
indx[MAXDIM];
int ndim,
*dim;
system_cache_lookup(element_type, false, &typlen, &typbyval,
&typdelim, &typelem, &typoutput, &typalign);
fmgr_info(typoutput, &outputproc);
sprintf(delim, "%c", typdelim);
ndim = ARR_NDIM(v);
dim = ARR_DIMS(v);
nitems = ArrayGetNItems(ndim, dim);
if (nitems == 0)
{
retval = (char *) palloc(3);
retval[0] = '{';
retval[1] = '}';
retval[2] = '\0';
PG_RETURN_CSTRING(retval);
}
p = ARR_DATA_PTR(v);
overall_length = 1; /* [TRH] don't forget to count \0 at end. */
values = (char **) palloc(nitems * sizeof(char *));
for (i = 0; i < nitems; i++)
{
if (typbyval)
{
switch (typlen)
{
case 1:
values[i] = DatumGetCString(FunctionCall3(&outputproc,
CharGetDatum(*p),
ObjectIdGetDatum(typelem),
Int32GetDatum(-1)));
break;
case 2:
values[i] = DatumGetCString(FunctionCall3(&outputproc,
Int16GetDatum(*(int16 *) p),
ObjectIdGetDatum(typelem),
Int32GetDatum(-1)));
break;
case 3:
case 4:
values[i] = DatumGetCString(FunctionCall3(&outputproc,
Int32GetDatum(*(int32 *) p),
ObjectIdGetDatum(typelem),
Int32GetDatum(-1)));
break;
}
p += typlen;
}
else
{
values[i] = DatumGetCString(FunctionCall3(&outputproc,
PointerGetDatum(p),
ObjectIdGetDatum(typelem),
Int32GetDatum(-1)));
if (typlen > 0)
p += typlen;
else
p += INTALIGN(*(int32 *) p);
/*
* For the pair of double quotes
*/
overall_length += 2;
}
for (tmp = values[i]; *tmp; tmp++)
{
overall_length += 1;
#ifndef TCL_ARRAYS
if (*tmp == '"')
overall_length += 1;
#endif
}
overall_length += 1;
}
/*
* count total number of curly braces in output string
*/
for (i = j = 0, k = 1; i < ndim; k *= dim[i++], j += k);
p = (char *) palloc(overall_length + 2 * j);
retval = p;
strcpy(p, "{");
for (i = 0; i < ndim; indx[i++] = 0);
j = 0;
k = 0;
do
{
for (i = j; i < ndim - 1; i++)
strcat(p, "{");
/*
* Surround anything that is not passed by value in double quotes.
* See above for more details.
*/
if (!typbyval)
{
strcat(p, "\"");
#ifndef TCL_ARRAYS
l = strlen(p);
for (tmp = values[k]; *tmp; tmp++)
{
if (*tmp == '"')
p[l++] = '\\';
p[l++] = *tmp;
}
p[l] = '\0';
#else
strcat(p, values[k]);
#endif
strcat(p, "\"");
}
else
strcat(p, values[k]);
pfree(values[k++]);
for (i = ndim - 1; i >= 0; i--)
{
indx[i] = (indx[i] + 1) % dim[i];
if (indx[i])
{
strcat(p, delim);
break;
}
else
strcat(p, "}");
}
j = i;
} while (j != -1);
pfree(values);
PG_RETURN_CSTRING(retval);
}
/*-----------------------------------------------------------------------------
* array_dims :
* returns the dimensions of the array pointed to by "v", as a "text"
*----------------------------------------------------------------------------
*/
Datum
array_dims(PG_FUNCTION_ARGS)
{
ArrayType *v = PG_GETARG_ARRAYTYPE_P(0);
text *result;
char *p;
int nbytes,
i;
int *dimv,
*lb;
/* Sanity check: does it look like an array at all? */
if (ARR_NDIM(v) <= 0 || ARR_NDIM(v) > MAXDIM)
PG_RETURN_NULL();
nbytes = ARR_NDIM(v) * 33 + 1;
/*
* 33 since we assume 15 digits per number + ':' +'[]'
*
* +1 allows for temp trailing null
*/
result = (text *) palloc(nbytes + VARHDRSZ);
p = VARDATA(result);
dimv = ARR_DIMS(v);
lb = ARR_LBOUND(v);
for (i = 0; i < ARR_NDIM(v); i++)
{
sprintf(p, "[%d:%d]", lb[i], dimv[i] + lb[i] - 1);
p += strlen(p);
}
VARATT_SIZEP(result) = strlen(VARDATA(result)) + VARHDRSZ;
PG_RETURN_TEXT_P(result);
}
/*---------------------------------------------------------------------------
* array_ref :
* This routine takes an array pointer and an index array and returns
* the referenced item as a Datum. Note that for a pass-by-reference
* datatype, the returned Datum is a pointer into the array object.
*---------------------------------------------------------------------------
*/
Datum
array_ref(ArrayType *array,
int nSubscripts,
int *indx,
bool elmbyval,
int elmlen,
int arraylen,
bool *isNull)
{
int i,
ndim,
*dim,
*lb,
offset,
fixedDim[1],
fixedLb[1];
char *arraydataptr,
*retptr;
if (array == (ArrayType *) NULL)
RETURN_NULL(Datum);
if (arraylen > 0)
{
/*
* fixed-length arrays -- these are assumed to be 1-d, 0-based
*/
ndim = 1;
fixedDim[0] = arraylen / elmlen;
fixedLb[0] = 0;
dim = fixedDim;
lb = fixedLb;
arraydataptr = (char *) array;
}
else
{
/* detoast input if necessary */
array = DatumGetArrayTypeP(PointerGetDatum(array));
ndim = ARR_NDIM(array);
dim = ARR_DIMS(array);
lb = ARR_LBOUND(array);
arraydataptr = ARR_DATA_PTR(array);
}
/*
* Return NULL for invalid subscript
*/
if (ndim != nSubscripts || ndim <= 0 || ndim > MAXDIM)
RETURN_NULL(Datum);
for (i = 0; i < ndim; i++)
if (indx[i] < lb[i] || indx[i] >= (dim[i] + lb[i]))
RETURN_NULL(Datum);
/*
* OK, get the element
*/
offset = ArrayGetOffset(nSubscripts, dim, lb, indx);
retptr = array_seek(arraydataptr, elmlen, offset);
return ArrayCast(retptr, elmbyval, elmlen);
}
/*-----------------------------------------------------------------------------
* array_get_slice :
* This routine takes an array and a range of indices (upperIndex and
* lowerIndx), creates a new array structure for the referred elements
* and returns a pointer to it.
*
* NOTE: we assume it is OK to scribble on the provided index arrays
* lowerIndx[] and upperIndx[]. These are generally just temporaries.
*-----------------------------------------------------------------------------
*/
ArrayType *
array_get_slice(ArrayType *array,
int nSubscripts,
int *upperIndx,
int *lowerIndx,
bool elmbyval,
int elmlen,
int arraylen,
bool *isNull)
{
int i,
ndim,
*dim,
*lb;
int fixedDim[1],
fixedLb[1];
char *arraydataptr;
ArrayType *newarray;
int bytes,
span[MAXDIM];
if (array == (ArrayType *) NULL)
RETURN_NULL(ArrayType *);
if (arraylen > 0)
{
/*
* fixed-length arrays -- currently, cannot slice these because
* parser labels output as being of the fixed-length array type!
* Code below shows how we could support it if the parser were
* changed to label output as a suitable varlena array type.
*/
elog(ERROR, "Slices of fixed-length arrays not implemented");
/*
* fixed-length arrays -- these are assumed to be 1-d, 0-based
*/
ndim = 1;
fixedDim[0] = arraylen / elmlen;
fixedLb[0] = 0;
dim = fixedDim;
lb = fixedLb;
arraydataptr = (char *) array;
}
else
{
/* detoast input if necessary */
array = DatumGetArrayTypeP(PointerGetDatum(array));
ndim = ARR_NDIM(array);
dim = ARR_DIMS(array);
lb = ARR_LBOUND(array);
arraydataptr = ARR_DATA_PTR(array);
}
/*
* Check provided subscripts. A slice exceeding the current array
* limits is silently truncated to the array limits. If we end up with
* an empty slice, return NULL (should it be an empty array instead?)
*/
if (ndim != nSubscripts || ndim <= 0 || ndim > MAXDIM)
RETURN_NULL(ArrayType *);
for (i = 0; i < ndim; i++)
{
if (lowerIndx[i] < lb[i])
lowerIndx[i] = lb[i];
if (upperIndx[i] >= (dim[i] + lb[i]))
upperIndx[i] = dim[i] + lb[i] - 1;
if (lowerIndx[i] > upperIndx[i])
RETURN_NULL(ArrayType *);
}
mda_get_range(nSubscripts, span, lowerIndx, upperIndx);
bytes = array_slice_size(ndim, dim, lb, arraydataptr,
elmlen, lowerIndx, upperIndx);
bytes += ARR_OVERHEAD(ndim);
newarray = (ArrayType *) palloc(bytes);
newarray->size = bytes;
newarray->ndim = ndim;
newarray->flags = 0;
memcpy(ARR_DIMS(newarray), span, ndim * sizeof(int));
memcpy(ARR_LBOUND(newarray), lowerIndx, ndim * sizeof(int));
array_extract_slice(ndim, dim, lb, arraydataptr, elmlen,
lowerIndx, upperIndx, ARR_DATA_PTR(newarray));
return newarray;
}
/*-----------------------------------------------------------------------------
* array_set :
* This routine sets the value of an array location (specified by
* an index array) to a new value specified by "dataValue".
* result :
* A new array is returned, just like the old except for the one
* modified entry.
*
* For one-dimensional arrays only, we allow the array to be extended
* by assigning to the position one above or one below the existing range.
* (We could be more flexible if we had a way to represent NULL elements.)
*
* NOTE: For assignments, we throw an error for invalid subscripts etc,
* rather than returning a NULL as the fetch operations do. The reasoning
* is that returning a NULL would cause the user's whole array to be replaced
* with NULL, which will probably not make him happy.
*-----------------------------------------------------------------------------
*/
ArrayType *
array_set(ArrayType *array,
int nSubscripts,
int *indx,
Datum dataValue,
bool elmbyval,
int elmlen,
int arraylen,
bool *isNull)
{
int i,
ndim,
dim[MAXDIM],
lb[MAXDIM],
offset;
ArrayType *newarray;
char *elt_ptr;
bool extendbefore = false;
bool extendafter = false;
int olddatasize,
newsize,
olditemlen,
newitemlen,
overheadlen,
lenbefore,
lenafter;
if (array == (ArrayType *) NULL)
RETURN_NULL(ArrayType *);
if (arraylen > 0)
{
/*
* fixed-length arrays -- these are assumed to be 1-d, 0-based.
* We cannot extend them, either.
*/
if (nSubscripts != 1)
elog(ERROR, "Invalid array subscripts");
if (indx[0] < 0 || indx[0] * elmlen >= arraylen)
elog(ERROR, "Invalid array subscripts");
newarray = (ArrayType *) palloc(arraylen);
memcpy(newarray, array, arraylen);
elt_ptr = (char *) newarray + indx[0] * elmlen;
ArrayCastAndSet(dataValue, elmbyval, elmlen, elt_ptr);
return newarray;
}
/* make sure item to be inserted is not toasted */
if (elmlen < 0)
dataValue = PointerGetDatum(PG_DETOAST_DATUM(dataValue));
/* detoast input if necessary */
array = DatumGetArrayTypeP(PointerGetDatum(array));
ndim = ARR_NDIM(array);
if (ndim != nSubscripts || ndim <= 0 || ndim > MAXDIM)
elog(ERROR, "Invalid array subscripts");
/* copy dim/lb since we may modify them */
memcpy(dim, ARR_DIMS(array), ndim * sizeof(int));
memcpy(lb, ARR_LBOUND(array), ndim * sizeof(int));
/*
* Check subscripts
*/
for (i = 0; i < ndim; i++)
{
if (indx[i] < lb[i])
{
if (ndim == 1 && indx[i] == lb[i] - 1)
{
dim[i]++;
lb[i]--;
extendbefore = true;
}
else
{
elog(ERROR, "Invalid array subscripts");
}
}
if (indx[i] >= (dim[i] + lb[i]))
{
if (ndim == 1 && indx[i] == (dim[i] + lb[i]))
{
dim[i]++;
extendafter = true;
}
else
{
elog(ERROR, "Invalid array subscripts");
}
}
}
/*
* Compute sizes of items and areas to copy
*/
overheadlen = ARR_OVERHEAD(ndim);
olddatasize = ARR_SIZE(array) - overheadlen;
if (extendbefore)
{
lenbefore = 0;
olditemlen = 0;
lenafter = olddatasize;
}
else if (extendafter)
{
lenbefore = olddatasize;
olditemlen = 0;
lenafter = 0;
}
else
{
offset = ArrayGetOffset(nSubscripts, dim, lb, indx);
elt_ptr = array_seek(ARR_DATA_PTR(array), elmlen, offset);
lenbefore = (int) (elt_ptr - ARR_DATA_PTR(array));
if (elmlen > 0)
olditemlen = elmlen;
else
olditemlen = INTALIGN(*(int32 *) elt_ptr);
lenafter = (int) (olddatasize - lenbefore - olditemlen);
}
if (elmlen > 0)
newitemlen = elmlen;
else
newitemlen = INTALIGN(*(int32 *) DatumGetPointer(dataValue));
newsize = overheadlen + lenbefore + newitemlen + lenafter;
/*
* OK, do the assignment
*/
newarray = (ArrayType *) palloc(newsize);
newarray->size = newsize;
newarray->ndim = ndim;
newarray->flags = 0;
memcpy(ARR_DIMS(newarray), dim, ndim * sizeof(int));
memcpy(ARR_LBOUND(newarray), lb, ndim * sizeof(int));
memcpy((char *) newarray + overheadlen,
(char *) array + overheadlen,
lenbefore);
memcpy((char *) newarray + overheadlen + lenbefore + newitemlen,
(char *) array + overheadlen + lenbefore + olditemlen,
lenafter);
ArrayCastAndSet(dataValue, elmbyval, elmlen,
(char *) newarray + overheadlen + lenbefore);
return newarray;
}
/*----------------------------------------------------------------------------
* array_set_slice :
* This routine sets the value of a range of array locations (specified
* by upper and lower index values ) to new values passed as
* another array
* result :
* A new array is returned, just like the old except for the
* modified range.
*
* NOTE: For assignments, we throw an error for silly subscripts etc,
* rather than returning a NULL as the fetch operations do. The reasoning
* is that returning a NULL would cause the user's whole array to be replaced
* with NULL, which will probably not make him happy.
*----------------------------------------------------------------------------
*/
ArrayType *
array_set_slice(ArrayType *array,
int nSubscripts,
int *upperIndx,
int *lowerIndx,
ArrayType *srcArray,
bool elmbyval,
int elmlen,
int arraylen,
bool *isNull)
{
int i,
ndim,
dim[MAXDIM],
lb[MAXDIM],
span[MAXDIM];
ArrayType *newarray;
int nsrcitems,
olddatasize,
newsize,
olditemsize,
newitemsize,
overheadlen,
lenbefore,
lenafter;
if (array == (ArrayType *) NULL)
RETURN_NULL(ArrayType *);
if (srcArray == (ArrayType *) NULL)
return array;
if (arraylen > 0)
{
/*
* fixed-length arrays -- not got round to doing this...
*/
elog(ERROR, "Updates on slices of fixed-length arrays not implemented");
}
/* detoast arrays if necessary */
array = DatumGetArrayTypeP(PointerGetDatum(array));
srcArray = DatumGetArrayTypeP(PointerGetDatum(srcArray));
/* note: we assume srcArray contains no toasted elements */
ndim = ARR_NDIM(array);
if (ndim != nSubscripts || ndim <= 0 || ndim > MAXDIM)
elog(ERROR, "Invalid array subscripts");
/* copy dim/lb since we may modify them */
memcpy(dim, ARR_DIMS(array), ndim * sizeof(int));
memcpy(lb, ARR_LBOUND(array), ndim * sizeof(int));
/*
* Check provided subscripts. A slice exceeding the current array
* limits throws an error, *except* in the 1-D case where we will
* extend the array as long as no hole is created.
* An empty slice is an error, too.
*/
for (i = 0; i < ndim; i++)
{
if (lowerIndx[i] > upperIndx[i])
elog(ERROR, "Invalid array subscripts");
if (lowerIndx[i] < lb[i])
{
if (ndim == 1 && upperIndx[i] >= lb[i] - 1)
{
dim[i] += lb[i] - lowerIndx[i];
lb[i] = lowerIndx[i];
}
else
{
elog(ERROR, "Invalid array subscripts");
}
}
if (upperIndx[i] >= (dim[i] + lb[i]))
{
if (ndim == 1 && lowerIndx[i] <= (dim[i] + lb[i]))
{
dim[i] = upperIndx[i] - lb[i] + 1;
}
else
{
elog(ERROR, "Invalid array subscripts");
}
}
}
/*
* Make sure source array has enough entries. Note we ignore the shape
* of the source array and just read entries serially.
*/
mda_get_range(ndim, span, lowerIndx, upperIndx);
nsrcitems = ArrayGetNItems(ndim, span);
if (nsrcitems > ArrayGetNItems(ARR_NDIM(srcArray), ARR_DIMS(srcArray)))
elog(ERROR, "Source array too small");
/*
* Compute space occupied by new entries, space occupied by replaced
* entries, and required space for new array.
*/
newitemsize = array_nelems_size(ARR_DATA_PTR(srcArray), elmlen,
nsrcitems);
overheadlen = ARR_OVERHEAD(ndim);
olddatasize = ARR_SIZE(array) - overheadlen;
if (ndim > 1)
{
/*
* here we do not need to cope with extension of the array;
* it would be a lot more complicated if we had to do so...
*/
olditemsize = array_slice_size(ndim, dim, lb, ARR_DATA_PTR(array),
elmlen, lowerIndx, upperIndx);
lenbefore = lenafter = 0; /* keep compiler quiet */
}
else
{
/*
* here we must allow for possibility of slice larger than orig array
*/
int oldlb = ARR_LBOUND(array)[0];
int oldub = oldlb + ARR_DIMS(array)[0] - 1;
int slicelb = MAX(oldlb, lowerIndx[0]);
int sliceub = MIN(oldub, upperIndx[0]);
char *oldarraydata = ARR_DATA_PTR(array);
lenbefore = array_nelems_size(oldarraydata,
elmlen,
slicelb - oldlb);
if (slicelb > sliceub)
olditemsize = 0;
else
olditemsize = array_nelems_size(oldarraydata + lenbefore,
elmlen,
sliceub - slicelb + 1);
lenafter = olddatasize - lenbefore - olditemsize;
}
newsize = overheadlen + olddatasize - olditemsize + newitemsize;
newarray = (ArrayType *) palloc(newsize);
newarray->size = newsize;
newarray->ndim = ndim;
newarray->flags = 0;
memcpy(ARR_DIMS(newarray), dim, ndim * sizeof(int));
memcpy(ARR_LBOUND(newarray), lb, ndim * sizeof(int));
if (ndim > 1)
{
/*
* here we do not need to cope with extension of the array;
* it would be a lot more complicated if we had to do so...
*/
array_insert_slice(ndim, dim, lb, ARR_DATA_PTR(array), olddatasize,
ARR_DATA_PTR(newarray), elmlen,
lowerIndx, upperIndx, ARR_DATA_PTR(srcArray));
}
else
{
memcpy((char *) newarray + overheadlen,
(char *) array + overheadlen,
lenbefore);
memcpy((char *) newarray + overheadlen + lenbefore,
ARR_DATA_PTR(srcArray),
newitemsize);
memcpy((char *) newarray + overheadlen + lenbefore + newitemsize,
(char *) array + overheadlen + lenbefore + olditemsize,
lenafter);
}
return newarray;
}
/*
* array_map()
*
* Map an array through an arbitrary function. Return a new array with
* same dimensions and each source element transformed by fn(). Each
* source element is passed as the first argument to fn(); additional
* arguments to be passed to fn() can be specified by the caller.
* The output array can have a different element type than the input.
*
* Parameters are:
* * fcinfo: a function-call data structure pre-constructed by the caller
* to be ready to call the desired function, with everything except the
* first argument position filled in. In particular, flinfo identifies
* the function fn(), and if nargs > 1 then argument positions after the
* first must be preset to the additional values to be passed. The
* first argument position initially holds the input array value.
* * inpType: OID of element type of input array. This must be the same as,
* or binary-compatible with, the first argument type of fn().
* * retType: OID of element type of output array. This must be the same as,
* or binary-compatible with, the result type of fn().
*
* NB: caller must assure that input array is not NULL. Currently,
* any additional parameters passed to fn() may not be specified as NULL
* either.
*/
Datum
array_map(FunctionCallInfo fcinfo, Oid inpType, Oid retType)
{
ArrayType *v;
ArrayType *result;
Datum *values;
Datum elt;
int *dim;
int ndim;
int nitems;
int i;
int nbytes = 0;
int inp_typlen;
bool inp_typbyval;
int typlen;
bool typbyval;
char typdelim;
Oid typelem;
Oid proc;
char typalign;
char *s;
/* Get input array */
if (fcinfo->nargs < 1)
elog(ERROR, "array_map: invalid nargs: %d", fcinfo->nargs);
if (PG_ARGISNULL(0))
elog(ERROR, "array_map: null input array");
v = PG_GETARG_ARRAYTYPE_P(0);
ndim = ARR_NDIM(v);
dim = ARR_DIMS(v);
nitems = ArrayGetNItems(ndim, dim);
/* Check for empty array */
if (nitems <= 0)
PG_RETURN_ARRAYTYPE_P(v);
/* Lookup source and result types. Unneeded variables are reused. */
system_cache_lookup(inpType, false, &inp_typlen, &inp_typbyval,
&typdelim, &typelem, &proc, &typalign);
system_cache_lookup(retType, false, &typlen, &typbyval,
&typdelim, &typelem, &proc, &typalign);
/* Allocate temporary array for new values */
values = (Datum *) palloc(nitems * sizeof(Datum));
/* Loop over source data */
s = (char *) ARR_DATA_PTR(v);
for (i = 0; i < nitems; i++)
{
/* Get source element */
if (inp_typbyval)
{
switch (inp_typlen)
{
case 1:
elt = CharGetDatum(*s);
break;
case 2:
elt = Int16GetDatum(*(int16 *) s);
break;
case 4:
elt = Int32GetDatum(*(int32 *) s);
break;
default:
elog(ERROR, "array_map: unsupported byval length %d",
inp_typlen);
elt = 0; /* keep compiler quiet */
break;
}
s += inp_typlen;
}
else
{
elt = PointerGetDatum(s);
if (inp_typlen > 0)
s += inp_typlen;
else
s += INTALIGN(*(int32 *) s);
}
/*
* Apply the given function to source elt and extra args.
*
* We assume the extra args are non-NULL, so need not check
* whether fn() is strict. Would need to do more work here
* to support arrays containing nulls, too.
*/
fcinfo->arg[0] = elt;
fcinfo->argnull[0] = false;
fcinfo->isnull = false;
values[i] = FunctionCallInvoke(fcinfo);
if (fcinfo->isnull)
elog(ERROR, "array_map: cannot handle NULL in array");
/* Ensure data is not toasted, and update total result size */
if (typbyval || typlen > 0)
nbytes += typlen;
else
{
values[i] = PointerGetDatum(PG_DETOAST_DATUM(values[i]));
nbytes += INTALIGN(VARSIZE(DatumGetPointer(values[i])));
}
}
/* Allocate and initialize the result array */
nbytes += ARR_OVERHEAD(ndim);
result = (ArrayType *) palloc(nbytes);
MemSet(result, 0, nbytes);
result->size = nbytes;
result->ndim = ndim;
memcpy(ARR_DIMS(result), ARR_DIMS(v), 2 * ndim * sizeof(int));
/* Note: do not risk trying to pfree the results of the called function */
CopyArrayEls(ARR_DATA_PTR(result), values, nitems,
typbyval, typlen, typalign, false);
pfree(values);
PG_RETURN_ARRAYTYPE_P(result);
}
/*----------
* construct_array --- simple method for constructing an array object
*
* elems: array of Datum items to become the array contents
* nelems: number of items
* elmbyval, elmlen, elmalign: info for the datatype of the items
*
* A palloc'd 1-D array object is constructed and returned. Note that
* elem values will be copied into the object even if pass-by-ref type.
* NULL element values are not supported.
*----------
*/
ArrayType *
construct_array(Datum *elems, int nelems,
bool elmbyval, int elmlen, char elmalign)
{
ArrayType *result;
int nbytes;
int i;
if (elmlen > 0)
{
/* XXX what about alignment? */
nbytes = elmlen * nelems;
}
else
{
/* varlena type ... make sure it is untoasted */
nbytes = 0;
for (i = 0; i < nelems; i++)
{
elems[i] = PointerGetDatum(PG_DETOAST_DATUM(elems[i]));
nbytes += INTALIGN(VARSIZE(DatumGetPointer(elems[i])));
}
}
/* Allocate and initialize 1-D result array */
nbytes += ARR_OVERHEAD(1);
result = (ArrayType *) palloc(nbytes);
result->size = nbytes;
result->ndim = 1;
result->flags = 0;
ARR_DIMS(result)[0] = nelems;
ARR_LBOUND(result)[0] = 1;
CopyArrayEls(ARR_DATA_PTR(result), elems, nelems,
elmbyval, elmlen, elmalign, false);
return result;
}
/*----------
* deconstruct_array --- simple method for extracting data from an array
*
* array: array object to examine (must not be NULL)
* elmbyval, elmlen, elmalign: info for the datatype of the items
* elemsp: return value, set to point to palloc'd array of Datum values
* nelemsp: return value, set to number of extracted values
*
* If array elements are pass-by-ref data type, the returned Datums will
* be pointers into the array object.
*----------
*/
void
deconstruct_array(ArrayType *array,
bool elmbyval, int elmlen, char elmalign,
Datum **elemsp, int *nelemsp)
{
Datum *elems;
int nelems;
char *p;
int i;
nelems = ArrayGetNItems(ARR_NDIM(array), ARR_DIMS(array));
if (nelems <= 0)
{
*elemsp = NULL;
*nelemsp = 0;
return;
}
*elemsp = elems = (Datum *) palloc(nelems * sizeof(Datum));
*nelemsp = nelems;
p = ARR_DATA_PTR(array);
for (i = 0; i < nelems; i++)
{
if (elmbyval)
{
switch (elmlen)
{
case 1:
elems[i] = CharGetDatum(*p);
break;
case 2:
elems[i] = Int16GetDatum(*(int16 *) p);
break;
case 4:
elems[i] = Int32GetDatum(*(int32 *) p);
break;
}
p += elmlen;
}
else
{
elems[i] = PointerGetDatum(p);
if (elmlen > 0)
p += elmlen;
else
p += INTALIGN(VARSIZE(p));
}
}
}
/*-----------------------------------------------------------------------------
* array_eq :
* compares two arrays for equality
* result :
* returns true if the arrays are equal, false otherwise.
*
* XXX bitwise equality is pretty bogus ...
*-----------------------------------------------------------------------------
*/
Datum
array_eq(PG_FUNCTION_ARGS)
{
ArrayType *array1 = PG_GETARG_ARRAYTYPE_P(0);
ArrayType *array2 = PG_GETARG_ARRAYTYPE_P(1);
bool result = true;
if (ARR_SIZE(array1) != ARR_SIZE(array2))
result = false;
else if (memcmp(array1, array2, ARR_SIZE(array1)) != 0)
result = false;
/* Avoid leaking memory when handed toasted input. */
PG_FREE_IF_COPY(array1, 0);
PG_FREE_IF_COPY(array2, 1);
PG_RETURN_BOOL(result);
}
/***************************************************************************/
/******************| Support Routines |*****************/
/***************************************************************************/
static void
system_cache_lookup(Oid element_type,
bool input,
int *typlen,
bool *typbyval,
char *typdelim,
Oid *typelem,
Oid *proc,
char *typalign)
{
HeapTuple typeTuple;
Form_pg_type typeStruct;
typeTuple = SearchSysCacheTuple(TYPEOID,
ObjectIdGetDatum(element_type),
0, 0, 0);
if (!HeapTupleIsValid(typeTuple))
elog(ERROR, "array_out: Cache lookup failed for type %u",
element_type);
typeStruct = (Form_pg_type) GETSTRUCT(typeTuple);
*typlen = typeStruct->typlen;
*typbyval = typeStruct->typbyval;
*typdelim = typeStruct->typdelim;
*typelem = typeStruct->typelem;
*typalign = typeStruct->typalign;
if (input)
*proc = typeStruct->typinput;
else
*proc = typeStruct->typoutput;
}
/*
* Fetch array element at pointer, converted correctly to a Datum
*/
static Datum
ArrayCast(char *value, bool byval, int len)
{
if (! byval)
return PointerGetDatum(value);
switch (len)
{
case 1:
return CharGetDatum(*value);
case 2:
return Int16GetDatum(*(int16 *) value);
case 4:
return Int32GetDatum(*(int32 *) value);
default:
elog(ERROR, "ArrayCast: unsupported byval length %d", len);
break;
}
return 0; /* keep compiler quiet */
}
/*
* Copy datum to *dest and return total space used (including align padding)
*
* XXX this routine needs to be told typalign too!
*/
static int
ArrayCastAndSet(Datum src,
bool typbyval,
int typlen,
char *dest)
{
int inc;
if (typlen > 0)
{
if (typbyval)
{
switch (typlen)
{
case 1:
*dest = DatumGetChar(src);
break;
case 2:
*(int16 *) dest = DatumGetInt16(src);
break;
case 4:
*(int32 *) dest = DatumGetInt32(src);
break;
default:
elog(ERROR, "ArrayCastAndSet: unsupported byval length %d",
typlen);
break;
}
/* For by-val types, assume no alignment padding is needed */
inc = typlen;
}
else
{
memmove(dest, DatumGetPointer(src), typlen);
/* XXX WRONG: need to consider type's alignment requirement */
inc = typlen;
}
}
else
{
/* varlena type */
memmove(dest, DatumGetPointer(src), VARSIZE(DatumGetPointer(src)));
/* XXX WRONG: should use MAXALIGN or type's alignment requirement */
inc = INTALIGN(VARSIZE(DatumGetPointer(src)));
}
return inc;
}
/*
* Compute total size of the nitems array elements starting at *ptr
*
* XXX should consider alignment spec for fixed-length types
*/
static int
array_nelems_size(char *ptr, int eltsize, int nitems)
{
char *origptr;
int i;
/* fixed-size elements? */
if (eltsize > 0)
return eltsize * nitems;
/* else assume they are varlena items */
origptr = ptr;
for (i = 0; i < nitems; i++)
ptr += INTALIGN(*(int32 *) ptr);
return ptr - origptr;
}
/*
* Advance ptr over nitems array elements
*/
static char *
array_seek(char *ptr, int eltsize, int nitems)
{
return ptr + array_nelems_size(ptr, eltsize, nitems);
}
/*
* Copy nitems array elements from srcptr to destptr
*
* Returns number of bytes copied
*/
static int
array_copy(char *destptr, int eltsize, int nitems, char *srcptr)
{
int numbytes = array_nelems_size(srcptr, eltsize, nitems);
memmove(destptr, srcptr, numbytes);
return numbytes;
}
/*
* Compute space needed for a slice of an array
*
* We assume the caller has verified that the slice coordinates are valid.
*/
static int
array_slice_size(int ndim, int *dim, int *lb, char *arraydataptr,
int eltsize, int *st, int *endp)
{
int st_pos,
span[MAXDIM],
prod[MAXDIM],
dist[MAXDIM],
indx[MAXDIM];
char *ptr;
int i,
j,
inc;
int count = 0;
mda_get_range(ndim, span, st, endp);
/* Pretty easy for fixed element length ... */
if (eltsize > 0)
return ArrayGetNItems(ndim, span) * eltsize;
/* Else gotta do it the hard way */
st_pos = ArrayGetOffset(ndim, dim, lb, st);
ptr = array_seek(arraydataptr, eltsize, st_pos);
mda_get_prod(ndim, dim, prod);
mda_get_offset_values(ndim, dist, prod, span);
for (i = 0; i < ndim; i++)
indx[i] = 0;
j = ndim - 1;
do
{
ptr = array_seek(ptr, eltsize, dist[j]);
inc = INTALIGN(*(int32 *) ptr);
ptr += inc;
count += inc;
} while ((j = mda_next_tuple(ndim, indx, span)) != -1);
return count;
}
/*
* Extract a slice of an array into consecutive elements at *destPtr.
*
* We assume the caller has verified that the slice coordinates are valid
* and allocated enough storage at *destPtr.
*/
static void
array_extract_slice(int ndim,
int *dim,
int *lb,
char *arraydataptr,
int eltsize,
int *st,
int *endp,
char *destPtr)
{
int st_pos,
prod[MAXDIM],
span[MAXDIM],
dist[MAXDIM],
indx[MAXDIM];
char *srcPtr;
int i,
j,
inc;
st_pos = ArrayGetOffset(ndim, dim, lb, st);
srcPtr = array_seek(arraydataptr, eltsize, st_pos);
mda_get_prod(ndim, dim, prod);
mda_get_range(ndim, span, st, endp);
mda_get_offset_values(ndim, dist, prod, span);
for (i = 0; i < ndim; i++)
indx[i] = 0;
j = ndim - 1;
do
{
srcPtr = array_seek(srcPtr, eltsize, dist[j]);
inc = array_copy(destPtr, eltsize, 1, srcPtr);
destPtr += inc;
srcPtr += inc;
} while ((j = mda_next_tuple(ndim, indx, span)) != -1);
}
/*
* Insert a slice into an array.
*
* ndim/dim/lb are dimensions of the dest array, which has data area
* starting at origPtr. A new array with those same dimensions is to
* be constructed; its data area starts at destPtr.
*
* Elements within the slice volume are taken from consecutive locations
* at srcPtr; elements outside it are copied from origPtr.
*
* We assume the caller has verified that the slice coordinates are valid
* and allocated enough storage at *destPtr.
*/
static void
array_insert_slice(int ndim,
int *dim,
int *lb,
char *origPtr,
int origdatasize,
char *destPtr,
int eltsize,
int *st,
int *endp,
char *srcPtr)
{
int st_pos,
prod[MAXDIM],
span[MAXDIM],
dist[MAXDIM],
indx[MAXDIM];
char *origEndpoint = origPtr + origdatasize;
int i,
j,
inc;
st_pos = ArrayGetOffset(ndim, dim, lb, st);
inc = array_copy(destPtr, eltsize, st_pos, origPtr);
destPtr += inc;
origPtr += inc;
mda_get_prod(ndim, dim, prod);
mda_get_range(ndim, span, st, endp);
mda_get_offset_values(ndim, dist, prod, span);
for (i = 0; i < ndim; i++)
indx[i] = 0;
j = ndim - 1;
do
{
/* Copy/advance over elements between here and next part of slice */
inc = array_copy(destPtr, eltsize, dist[j], origPtr);
destPtr += inc;
origPtr += inc;
/* Copy new element at this slice position */
inc = array_copy(destPtr, eltsize, 1, srcPtr);
destPtr += inc;
srcPtr += inc;
/* Advance over old element at this slice position */
origPtr = array_seek(origPtr, eltsize, 1);
} while ((j = mda_next_tuple(ndim, indx, span)) != -1);
/* don't miss any data at the end */
memcpy(destPtr, origPtr, origEndpoint - origPtr);
}
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