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postgresql/src/backend/nodes/readfuncs.c

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/*-------------------------------------------------------------------------
*
* readfuncs.c
* Reader functions for Postgres tree nodes.
*
* Portions Copyright (c) 1996-2023, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
*
* IDENTIFICATION
* src/backend/nodes/readfuncs.c
*
* NOTES
* Parse location fields are written out by outfuncs.c, but only for
* debugging use. When reading a location field, we normally discard
* the stored value and set the location field to -1 (ie, "unknown").
* This is because nodes coming from a stored rule should not be thought
* to have a known location in the current query's text.
*
* However, if restore_location_fields is true, we do restore location
* fields from the string. This is currently intended only for use by the
* WRITE_READ_PARSE_PLAN_TREES test code, which doesn't want to cause
* any change in the node contents.
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include <math.h>
#include "miscadmin.h"
#include "nodes/bitmapset.h"
#include "nodes/readfuncs.h"
/*
* Macros to simplify reading of different kinds of fields. Use these
* wherever possible to reduce the chance for silly typos. Note that these
* hard-wire conventions about the names of the local variables in a Read
* routine.
*/
/* Macros for declaring appropriate local variables */
/* A few guys need only local_node */
#define READ_LOCALS_NO_FIELDS(nodeTypeName) \
nodeTypeName *local_node = makeNode(nodeTypeName)
/* And a few guys need only the pg_strtok support fields */
#define READ_TEMP_LOCALS() \
const char *token; \
int length
/* ... but most need both */
#define READ_LOCALS(nodeTypeName) \
READ_LOCALS_NO_FIELDS(nodeTypeName); \
READ_TEMP_LOCALS()
/* Read an integer field (anything written as ":fldname %d") */
#define READ_INT_FIELD(fldname) \
token = pg_strtok(&length); /* skip :fldname */ \
token = pg_strtok(&length); /* get field value */ \
local_node->fldname = atoi(token)
/* Read an unsigned integer field (anything written as ":fldname %u") */
#define READ_UINT_FIELD(fldname) \
token = pg_strtok(&length); /* skip :fldname */ \
token = pg_strtok(&length); /* get field value */ \
local_node->fldname = atoui(token)
/* Read an unsigned integer field (anything written using UINT64_FORMAT) */
#define READ_UINT64_FIELD(fldname) \
token = pg_strtok(&length); /* skip :fldname */ \
token = pg_strtok(&length); /* get field value */ \
local_node->fldname = strtou64(token, NULL, 10)
/* Read a long integer field (anything written as ":fldname %ld") */
#define READ_LONG_FIELD(fldname) \
token = pg_strtok(&length); /* skip :fldname */ \
token = pg_strtok(&length); /* get field value */ \
local_node->fldname = atol(token)
/* Read an OID field (don't hard-wire assumption that OID is same as uint) */
#define READ_OID_FIELD(fldname) \
token = pg_strtok(&length); /* skip :fldname */ \
token = pg_strtok(&length); /* get field value */ \
local_node->fldname = atooid(token)
/* Read a char field (ie, one ascii character) */
#define READ_CHAR_FIELD(fldname) \
token = pg_strtok(&length); /* skip :fldname */ \
token = pg_strtok(&length); /* get field value */ \
/* avoid overhead of calling debackslash() for one char */ \
local_node->fldname = (length == 0) ? '\0' : (token[0] == '\\' ? token[1] : token[0])
/* Read an enumerated-type field that was written as an integer code */
#define READ_ENUM_FIELD(fldname, enumtype) \
token = pg_strtok(&length); /* skip :fldname */ \
token = pg_strtok(&length); /* get field value */ \
local_node->fldname = (enumtype) atoi(token)
/* Read a float field */
#define READ_FLOAT_FIELD(fldname) \
token = pg_strtok(&length); /* skip :fldname */ \
token = pg_strtok(&length); /* get field value */ \
local_node->fldname = atof(token)
/* Read a boolean field */
#define READ_BOOL_FIELD(fldname) \
token = pg_strtok(&length); /* skip :fldname */ \
token = pg_strtok(&length); /* get field value */ \
local_node->fldname = strtobool(token)
/* Read a character-string field */
#define READ_STRING_FIELD(fldname) \
token = pg_strtok(&length); /* skip :fldname */ \
token = pg_strtok(&length); /* get field value */ \
local_node->fldname = nullable_string(token, length)
/* Read a parse location field (and possibly throw away the value) */
#ifdef WRITE_READ_PARSE_PLAN_TREES
#define READ_LOCATION_FIELD(fldname) \
token = pg_strtok(&length); /* skip :fldname */ \
token = pg_strtok(&length); /* get field value */ \
local_node->fldname = restore_location_fields ? atoi(token) : -1
#else
#define READ_LOCATION_FIELD(fldname) \
token = pg_strtok(&length); /* skip :fldname */ \
token = pg_strtok(&length); /* get field value */ \
(void) token; /* in case not used elsewhere */ \
local_node->fldname = -1 /* set field to "unknown" */
#endif
/* Read a Node field */
#define READ_NODE_FIELD(fldname) \
token = pg_strtok(&length); /* skip :fldname */ \
(void) token; /* in case not used elsewhere */ \
local_node->fldname = nodeRead(NULL, 0)
/* Read a bitmapset field */
#define READ_BITMAPSET_FIELD(fldname) \
token = pg_strtok(&length); /* skip :fldname */ \
(void) token; /* in case not used elsewhere */ \
local_node->fldname = _readBitmapset()
/* Read an attribute number array */
#define READ_ATTRNUMBER_ARRAY(fldname, len) \
token = pg_strtok(&length); /* skip :fldname */ \
local_node->fldname = readAttrNumberCols(len)
/* Read an oid array */
#define READ_OID_ARRAY(fldname, len) \
token = pg_strtok(&length); /* skip :fldname */ \
local_node->fldname = readOidCols(len)
/* Read an int array */
#define READ_INT_ARRAY(fldname, len) \
token = pg_strtok(&length); /* skip :fldname */ \
local_node->fldname = readIntCols(len)
/* Read a bool array */
#define READ_BOOL_ARRAY(fldname, len) \
token = pg_strtok(&length); /* skip :fldname */ \
local_node->fldname = readBoolCols(len)
/* Routine exit */
#define READ_DONE() \
return local_node
/*
* NOTE: use atoi() to read values written with %d, or atoui() to read
* values written with %u in outfuncs.c. An exception is OID values,
* for which use atooid(). (As of 7.1, outfuncs.c writes OIDs as %u,
* but this will probably change in the future.)
*/
#define atoui(x) ((unsigned int) strtoul((x), NULL, 10))
#define strtobool(x) ((*(x) == 't') ? true : false)
static char *
nullable_string(const char *token, int length)
{
/* outToken emits <> for NULL, and pg_strtok makes that an empty string */
if (length == 0)
return NULL;
/* outToken emits "" for empty string */
if (length == 2 && token[0] == '"' && token[1] == '"')
return pstrdup("");
/* otherwise, we must remove protective backslashes added by outToken */
return debackslash(token, length);
}
/*
* _readBitmapset
*
* Note: this code is used in contexts where we know that a Bitmapset
* is expected. There is equivalent code in nodeRead() that can read a
* Bitmapset when we come across one in other contexts.
*/
static Bitmapset *
_readBitmapset(void)
{
Bitmapset *result = NULL;
READ_TEMP_LOCALS();
token = pg_strtok(&length);
if (token == NULL)
elog(ERROR, "incomplete Bitmapset structure");
if (length != 1 || token[0] != '(')
elog(ERROR, "unrecognized token: \"%.*s\"", length, token);
token = pg_strtok(&length);
if (token == NULL)
elog(ERROR, "incomplete Bitmapset structure");
if (length != 1 || token[0] != 'b')
elog(ERROR, "unrecognized token: \"%.*s\"", length, token);
for (;;)
{
int val;
char *endptr;
token = pg_strtok(&length);
if (token == NULL)
elog(ERROR, "unterminated Bitmapset structure");
if (length == 1 && token[0] == ')')
break;
val = (int) strtol(token, &endptr, 10);
if (endptr != token + length)
elog(ERROR, "unrecognized integer: \"%.*s\"", length, token);
result = bms_add_member(result, val);
}
return result;
}
/*
* We export this function for use by extensions that define extensible nodes.
* That's somewhat historical, though, because calling nodeRead() will work.
*/
Bitmapset *
readBitmapset(void)
{
return _readBitmapset();
}
#include "readfuncs.funcs.c"
/*
* Support functions for nodes with custom_read_write attribute or
* special_read_write attribute
*/
static Const *
_readConst(void)
{
READ_LOCALS(Const);
READ_OID_FIELD(consttype);
READ_INT_FIELD(consttypmod);
READ_OID_FIELD(constcollid);
READ_INT_FIELD(constlen);
READ_BOOL_FIELD(constbyval);
READ_BOOL_FIELD(constisnull);
READ_LOCATION_FIELD(location);
token = pg_strtok(&length); /* skip :constvalue */
if (local_node->constisnull)
token = pg_strtok(&length); /* skip "<>" */
else
local_node->constvalue = readDatum(local_node->constbyval);
READ_DONE();
}
static BoolExpr *
_readBoolExpr(void)
{
READ_LOCALS(BoolExpr);
/* do-it-yourself enum representation */
token = pg_strtok(&length); /* skip :boolop */
token = pg_strtok(&length); /* get field value */
if (length == 3 && strncmp(token, "and", 3) == 0)
local_node->boolop = AND_EXPR;
else if (length == 2 && strncmp(token, "or", 2) == 0)
local_node->boolop = OR_EXPR;
else if (length == 3 && strncmp(token, "not", 3) == 0)
local_node->boolop = NOT_EXPR;
else
elog(ERROR, "unrecognized boolop \"%.*s\"", length, token);
READ_NODE_FIELD(args);
READ_LOCATION_FIELD(location);
READ_DONE();
}
static A_Const *
_readA_Const(void)
{
READ_LOCALS(A_Const);
/* We expect either NULL or :val here */
token = pg_strtok(&length);
if (length == 4 && strncmp(token, "NULL", 4) == 0)
local_node->isnull = true;
else
{
union ValUnion *tmp = nodeRead(NULL, 0);
/* To forestall valgrind complaints, copy only the valid data */
switch (nodeTag(tmp))
{
case T_Integer:
memcpy(&local_node->val, tmp, sizeof(Integer));
break;
case T_Float:
memcpy(&local_node->val, tmp, sizeof(Float));
break;
case T_Boolean:
memcpy(&local_node->val, tmp, sizeof(Boolean));
break;
case T_String:
memcpy(&local_node->val, tmp, sizeof(String));
break;
case T_BitString:
memcpy(&local_node->val, tmp, sizeof(BitString));
break;
default:
elog(ERROR, "unrecognized node type: %d",
(int) nodeTag(tmp));
break;
}
}
READ_LOCATION_FIELD(location);
READ_DONE();
}
/*
* _readConstraint
*/
static Constraint *
_readConstraint(void)
{
READ_LOCALS(Constraint);
READ_STRING_FIELD(conname);
READ_BOOL_FIELD(deferrable);
READ_BOOL_FIELD(initdeferred);
READ_LOCATION_FIELD(location);
token = pg_strtok(&length); /* skip :contype */
token = pg_strtok(&length); /* get field value */
if (length == 4 && strncmp(token, "NULL", 4) == 0)
local_node->contype = CONSTR_NULL;
else if (length == 8 && strncmp(token, "NOT_NULL", 8) == 0)
local_node->contype = CONSTR_NOTNULL;
else if (length == 7 && strncmp(token, "DEFAULT", 7) == 0)
local_node->contype = CONSTR_DEFAULT;
else if (length == 8 && strncmp(token, "IDENTITY", 8) == 0)
local_node->contype = CONSTR_IDENTITY;
else if (length == 9 && strncmp(token, "GENERATED", 9) == 0)
local_node->contype = CONSTR_GENERATED;
else if (length == 5 && strncmp(token, "CHECK", 5) == 0)
local_node->contype = CONSTR_CHECK;
else if (length == 11 && strncmp(token, "PRIMARY_KEY", 11) == 0)
local_node->contype = CONSTR_PRIMARY;
else if (length == 6 && strncmp(token, "UNIQUE", 6) == 0)
local_node->contype = CONSTR_UNIQUE;
else if (length == 9 && strncmp(token, "EXCLUSION", 9) == 0)
local_node->contype = CONSTR_EXCLUSION;
else if (length == 11 && strncmp(token, "FOREIGN_KEY", 11) == 0)
local_node->contype = CONSTR_FOREIGN;
else if (length == 15 && strncmp(token, "ATTR_DEFERRABLE", 15) == 0)
local_node->contype = CONSTR_ATTR_DEFERRABLE;
else if (length == 19 && strncmp(token, "ATTR_NOT_DEFERRABLE", 19) == 0)
local_node->contype = CONSTR_ATTR_NOT_DEFERRABLE;
else if (length == 13 && strncmp(token, "ATTR_DEFERRED", 13) == 0)
local_node->contype = CONSTR_ATTR_DEFERRED;
else if (length == 14 && strncmp(token, "ATTR_IMMEDIATE", 14) == 0)
local_node->contype = CONSTR_ATTR_IMMEDIATE;
switch (local_node->contype)
{
case CONSTR_NULL:
case CONSTR_NOTNULL:
/* no extra fields */
break;
case CONSTR_DEFAULT:
READ_NODE_FIELD(raw_expr);
READ_STRING_FIELD(cooked_expr);
break;
case CONSTR_IDENTITY:
READ_NODE_FIELD(options);
READ_CHAR_FIELD(generated_when);
break;
case CONSTR_GENERATED:
READ_NODE_FIELD(raw_expr);
READ_STRING_FIELD(cooked_expr);
READ_CHAR_FIELD(generated_when);
break;
case CONSTR_CHECK:
READ_BOOL_FIELD(is_no_inherit);
READ_NODE_FIELD(raw_expr);
READ_STRING_FIELD(cooked_expr);
READ_BOOL_FIELD(skip_validation);
READ_BOOL_FIELD(initially_valid);
break;
case CONSTR_PRIMARY:
READ_NODE_FIELD(keys);
READ_NODE_FIELD(including);
READ_NODE_FIELD(options);
READ_STRING_FIELD(indexname);
READ_STRING_FIELD(indexspace);
READ_BOOL_FIELD(reset_default_tblspc);
/* access_method and where_clause not currently used */
break;
case CONSTR_UNIQUE:
READ_BOOL_FIELD(nulls_not_distinct);
READ_NODE_FIELD(keys);
READ_NODE_FIELD(including);
READ_NODE_FIELD(options);
READ_STRING_FIELD(indexname);
READ_STRING_FIELD(indexspace);
READ_BOOL_FIELD(reset_default_tblspc);
/* access_method and where_clause not currently used */
break;
case CONSTR_EXCLUSION:
READ_NODE_FIELD(exclusions);
READ_NODE_FIELD(including);
READ_NODE_FIELD(options);
READ_STRING_FIELD(indexname);
READ_STRING_FIELD(indexspace);
READ_BOOL_FIELD(reset_default_tblspc);
READ_STRING_FIELD(access_method);
READ_NODE_FIELD(where_clause);
break;
case CONSTR_FOREIGN:
READ_NODE_FIELD(pktable);
READ_NODE_FIELD(fk_attrs);
READ_NODE_FIELD(pk_attrs);
READ_CHAR_FIELD(fk_matchtype);
READ_CHAR_FIELD(fk_upd_action);
READ_CHAR_FIELD(fk_del_action);
READ_NODE_FIELD(fk_del_set_cols);
READ_NODE_FIELD(old_conpfeqop);
READ_OID_FIELD(old_pktable_oid);
READ_BOOL_FIELD(skip_validation);
READ_BOOL_FIELD(initially_valid);
break;
case CONSTR_ATTR_DEFERRABLE:
case CONSTR_ATTR_NOT_DEFERRABLE:
case CONSTR_ATTR_DEFERRED:
case CONSTR_ATTR_IMMEDIATE:
/* no extra fields */
break;
default:
elog(ERROR, "unrecognized ConstrType: %d", (int) local_node->contype);
break;
}
READ_DONE();
}
static RangeTblEntry *
_readRangeTblEntry(void)
{
READ_LOCALS(RangeTblEntry);
/* put alias + eref first to make dump more legible */
READ_NODE_FIELD(alias);
READ_NODE_FIELD(eref);
READ_ENUM_FIELD(rtekind, RTEKind);
switch (local_node->rtekind)
{
case RTE_RELATION:
READ_OID_FIELD(relid);
READ_CHAR_FIELD(relkind);
READ_INT_FIELD(rellockmode);
READ_NODE_FIELD(tablesample);
READ_UINT_FIELD(perminfoindex);
break;
case RTE_SUBQUERY:
READ_NODE_FIELD(subquery);
READ_BOOL_FIELD(security_barrier);
/* we re-use these RELATION fields, too: */
READ_OID_FIELD(relid);
READ_INT_FIELD(rellockmode);
READ_UINT_FIELD(perminfoindex);
break;
case RTE_JOIN:
READ_ENUM_FIELD(jointype, JoinType);
READ_INT_FIELD(joinmergedcols);
READ_NODE_FIELD(joinaliasvars);
READ_NODE_FIELD(joinleftcols);
READ_NODE_FIELD(joinrightcols);
READ_NODE_FIELD(join_using_alias);
break;
case RTE_FUNCTION:
READ_NODE_FIELD(functions);
READ_BOOL_FIELD(funcordinality);
break;
case RTE_TABLEFUNC:
READ_NODE_FIELD(tablefunc);
/* The RTE must have a copy of the column type info, if any */
if (local_node->tablefunc)
{
TableFunc *tf = local_node->tablefunc;
local_node->coltypes = tf->coltypes;
local_node->coltypmods = tf->coltypmods;
local_node->colcollations = tf->colcollations;
}
break;
case RTE_VALUES:
READ_NODE_FIELD(values_lists);
READ_NODE_FIELD(coltypes);
READ_NODE_FIELD(coltypmods);
READ_NODE_FIELD(colcollations);
break;
case RTE_CTE:
READ_STRING_FIELD(ctename);
READ_UINT_FIELD(ctelevelsup);
READ_BOOL_FIELD(self_reference);
READ_NODE_FIELD(coltypes);
READ_NODE_FIELD(coltypmods);
READ_NODE_FIELD(colcollations);
break;
case RTE_NAMEDTUPLESTORE:
READ_STRING_FIELD(enrname);
READ_FLOAT_FIELD(enrtuples);
READ_NODE_FIELD(coltypes);
READ_NODE_FIELD(coltypmods);
READ_NODE_FIELD(colcollations);
/* we re-use these RELATION fields, too: */
READ_OID_FIELD(relid);
break;
case RTE_RESULT:
/* no extra fields */
break;
default:
elog(ERROR, "unrecognized RTE kind: %d",
(int) local_node->rtekind);
break;
}
READ_BOOL_FIELD(lateral);
READ_BOOL_FIELD(inh);
READ_BOOL_FIELD(inFromCl);
READ_NODE_FIELD(securityQuals);
READ_DONE();
}
static A_Expr *
_readA_Expr(void)
{
READ_LOCALS(A_Expr);
token = pg_strtok(&length);
if (length == 3 && strncmp(token, "ANY", 3) == 0)
{
local_node->kind = AEXPR_OP_ANY;
READ_NODE_FIELD(name);
}
else if (length == 3 && strncmp(token, "ALL", 3) == 0)
{
local_node->kind = AEXPR_OP_ALL;
READ_NODE_FIELD(name);
}
else if (length == 8 && strncmp(token, "DISTINCT", 8) == 0)
{
local_node->kind = AEXPR_DISTINCT;
READ_NODE_FIELD(name);
}
else if (length == 12 && strncmp(token, "NOT_DISTINCT", 12) == 0)
{
local_node->kind = AEXPR_NOT_DISTINCT;
READ_NODE_FIELD(name);
}
else if (length == 6 && strncmp(token, "NULLIF", 6) == 0)
{
local_node->kind = AEXPR_NULLIF;
READ_NODE_FIELD(name);
}
else if (length == 2 && strncmp(token, "IN", 2) == 0)
{
local_node->kind = AEXPR_IN;
READ_NODE_FIELD(name);
}
else if (length == 4 && strncmp(token, "LIKE", 4) == 0)
{
local_node->kind = AEXPR_LIKE;
READ_NODE_FIELD(name);
}
else if (length == 5 && strncmp(token, "ILIKE", 5) == 0)
{
local_node->kind = AEXPR_ILIKE;
READ_NODE_FIELD(name);
}
else if (length == 7 && strncmp(token, "SIMILAR", 7) == 0)
{
local_node->kind = AEXPR_SIMILAR;
READ_NODE_FIELD(name);
}
else if (length == 7 && strncmp(token, "BETWEEN", 7) == 0)
{
local_node->kind = AEXPR_BETWEEN;
READ_NODE_FIELD(name);
}
else if (length == 11 && strncmp(token, "NOT_BETWEEN", 11) == 0)
{
local_node->kind = AEXPR_NOT_BETWEEN;
READ_NODE_FIELD(name);
}
else if (length == 11 && strncmp(token, "BETWEEN_SYM", 11) == 0)
{
local_node->kind = AEXPR_BETWEEN_SYM;
READ_NODE_FIELD(name);
}
else if (length == 15 && strncmp(token, "NOT_BETWEEN_SYM", 15) == 0)
{
local_node->kind = AEXPR_NOT_BETWEEN_SYM;
READ_NODE_FIELD(name);
}
else if (length == 5 && strncmp(token, ":name", 5) == 0)
{
local_node->kind = AEXPR_OP;
local_node->name = nodeRead(NULL, 0);
}
else
elog(ERROR, "unrecognized A_Expr kind: \"%.*s\"", length, token);
READ_NODE_FIELD(lexpr);
READ_NODE_FIELD(rexpr);
READ_LOCATION_FIELD(location);
READ_DONE();
}
static ExtensibleNode *
_readExtensibleNode(void)
{
const ExtensibleNodeMethods *methods;
ExtensibleNode *local_node;
const char *extnodename;
READ_TEMP_LOCALS();
token = pg_strtok(&length); /* skip :extnodename */
token = pg_strtok(&length); /* get extnodename */
extnodename = nullable_string(token, length);
if (!extnodename)
elog(ERROR, "extnodename has to be supplied");
methods = GetExtensibleNodeMethods(extnodename, false);
local_node = (ExtensibleNode *) newNode(methods->node_size,
T_ExtensibleNode);
local_node->extnodename = extnodename;
/* deserialize the private fields */
methods->nodeRead(local_node);
READ_DONE();
}
/*
* parseNodeString
*
* Given a character string representing a node tree, parseNodeString creates
* the internal node structure.
*
* The string to be read must already have been loaded into pg_strtok().
*/
Node *
parseNodeString(void)
{
void *return_value;
READ_TEMP_LOCALS();
/* Guard against stack overflow due to overly complex expressions */
check_stack_depth();
token = pg_strtok(&length);
#define MATCH(tokname, namelen) \
(length == namelen && memcmp(token, tokname, namelen) == 0)
if (false)
;
#include "readfuncs.switch.c"
else
{
elog(ERROR, "badly formatted node string \"%.32s\"...", token);
return_value = NULL; /* keep compiler quiet */
}
return (Node *) return_value;
}
/*
* readDatum
*
* Given a string representation of a constant, recreate the appropriate
* Datum. The string representation embeds length info, but not byValue,
* so we must be told that.
*/
Datum
readDatum(bool typbyval)
{
Size length,
i;
int tokenLength;
const char *token;
Datum res;
char *s;
/*
* read the actual length of the value
*/
token = pg_strtok(&tokenLength);
length = atoui(token);
token = pg_strtok(&tokenLength); /* read the '[' */
if (token == NULL || token[0] != '[')
elog(ERROR, "expected \"[\" to start datum, but got \"%s\"; length = %zu",
token ? token : "[NULL]", length);
if (typbyval)
{
if (length > (Size) sizeof(Datum))
elog(ERROR, "byval datum but length = %zu", length);
res = (Datum) 0;
s = (char *) (&res);
for (i = 0; i < (Size) sizeof(Datum); i++)
{
token = pg_strtok(&tokenLength);
s[i] = (char) atoi(token);
}
}
else if (length <= 0)
res = (Datum) NULL;
else
{
s = (char *) palloc(length);
for (i = 0; i < length; i++)
{
token = pg_strtok(&tokenLength);
s[i] = (char) atoi(token);
}
res = PointerGetDatum(s);
}
token = pg_strtok(&tokenLength); /* read the ']' */
if (token == NULL || token[0] != ']')
elog(ERROR, "expected \"]\" to end datum, but got \"%s\"; length = %zu",
token ? token : "[NULL]", length);
return res;
}
/*
* common implementation for scalar-array-reading functions
*
* The data format is either "<>" for a NULL pointer (in which case numCols
* is ignored) or "(item item item)" where the number of items must equal
* numCols. The convfunc must be okay with stopping at whitespace or a
* right parenthesis, since pg_strtok won't null-terminate the token.
*/
#define READ_SCALAR_ARRAY(fnname, datatype, convfunc) \
datatype * \
fnname(int numCols) \
{ \
datatype *vals; \
READ_TEMP_LOCALS(); \
token = pg_strtok(&length); \
if (token == NULL) \
elog(ERROR, "incomplete scalar array"); \
if (length == 0) \
return NULL; /* it was "<>", so return NULL pointer */ \
if (length != 1 || token[0] != '(') \
elog(ERROR, "unrecognized token: \"%.*s\"", length, token); \
vals = (datatype *) palloc(numCols * sizeof(datatype)); \
for (int i = 0; i < numCols; i++) \
{ \
token = pg_strtok(&length); \
if (token == NULL || token[0] == ')') \
elog(ERROR, "incomplete scalar array"); \
vals[i] = convfunc(token); \
} \
token = pg_strtok(&length); \
if (token == NULL || length != 1 || token[0] != ')') \
elog(ERROR, "incomplete scalar array"); \
return vals; \
}
/*
* Note: these functions are exported in nodes.h for possible use by
* extensions, so don't mess too much with their names or API.
*/
READ_SCALAR_ARRAY(readAttrNumberCols, int16, atoi)
READ_SCALAR_ARRAY(readOidCols, Oid, atooid)
/* outfuncs.c has writeIndexCols, but we don't yet need that here */
/* READ_SCALAR_ARRAY(readIndexCols, Index, atoui) */
READ_SCALAR_ARRAY(readIntCols, int, atoi)
READ_SCALAR_ARRAY(readBoolCols, bool, strtobool)
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