mirror of
https://git.postgresql.org/git/postgresql.git
synced 2024-12-15 08:20:16 +08:00
e7128e8dbb
Because of gcc -Wmissing-prototypes, all functions in dynamically loadable modules must have a separate prototype declaration. This is meant to detect global functions that are not declared in header files, but in cases where the function is called via dfmgr, this is redundant. Besides filling up space with boilerplate, this is a frequent source of compiler warnings in extension modules. We can fix that by creating the function prototype as part of the PG_FUNCTION_INFO_V1 macro, which such modules have to use anyway. That makes the code of modules cleaner, because there is one less place where the entry points have to be listed, and creates an additional check that functions have the right prototype. Remove now redundant prototypes from contrib and other modules.
534 lines
10 KiB
C
534 lines
10 KiB
C
/*
|
|
* txtquery io
|
|
* Teodor Sigaev <teodor@stack.net>
|
|
* contrib/ltree/ltxtquery_io.c
|
|
*/
|
|
#include "postgres.h"
|
|
|
|
#include <ctype.h>
|
|
|
|
#include "crc32.h"
|
|
#include "ltree.h"
|
|
#include "miscadmin.h"
|
|
|
|
PG_FUNCTION_INFO_V1(ltxtq_in);
|
|
PG_FUNCTION_INFO_V1(ltxtq_out);
|
|
|
|
|
|
/* parser's states */
|
|
#define WAITOPERAND 1
|
|
#define INOPERAND 2
|
|
#define WAITOPERATOR 3
|
|
|
|
/*
|
|
* node of query tree, also used
|
|
* for storing polish notation in parser
|
|
*/
|
|
typedef struct NODE
|
|
{
|
|
int32 type;
|
|
int32 val;
|
|
int16 distance;
|
|
int16 length;
|
|
uint16 flag;
|
|
struct NODE *next;
|
|
} NODE;
|
|
|
|
typedef struct
|
|
{
|
|
char *buf;
|
|
int32 state;
|
|
int32 count;
|
|
/* reverse polish notation in list (for temporary usage) */
|
|
NODE *str;
|
|
/* number in str */
|
|
int32 num;
|
|
|
|
/* user-friendly operand */
|
|
int32 lenop;
|
|
int32 sumlen;
|
|
char *op;
|
|
char *curop;
|
|
} QPRS_STATE;
|
|
|
|
/*
|
|
* get token from query string
|
|
*/
|
|
static int32
|
|
gettoken_query(QPRS_STATE *state, int32 *val, int32 *lenval, char **strval, uint16 *flag)
|
|
{
|
|
int charlen;
|
|
|
|
for (;;)
|
|
{
|
|
charlen = pg_mblen(state->buf);
|
|
|
|
switch (state->state)
|
|
{
|
|
case WAITOPERAND:
|
|
if (charlen == 1 && t_iseq(state->buf, '!'))
|
|
{
|
|
(state->buf)++;
|
|
*val = (int32) '!';
|
|
return OPR;
|
|
}
|
|
else if (charlen == 1 && t_iseq(state->buf, '('))
|
|
{
|
|
state->count++;
|
|
(state->buf)++;
|
|
return OPEN;
|
|
}
|
|
else if (ISALNUM(state->buf))
|
|
{
|
|
state->state = INOPERAND;
|
|
*strval = state->buf;
|
|
*lenval = charlen;
|
|
*flag = 0;
|
|
}
|
|
else if (!t_isspace(state->buf))
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_SYNTAX_ERROR),
|
|
errmsg("operand syntax error")));
|
|
break;
|
|
case INOPERAND:
|
|
if (ISALNUM(state->buf))
|
|
{
|
|
if (*flag)
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_SYNTAX_ERROR),
|
|
errmsg("modificators syntax error")));
|
|
*lenval += charlen;
|
|
}
|
|
else if (charlen == 1 && t_iseq(state->buf, '%'))
|
|
*flag |= LVAR_SUBLEXEME;
|
|
else if (charlen == 1 && t_iseq(state->buf, '@'))
|
|
*flag |= LVAR_INCASE;
|
|
else if (charlen == 1 && t_iseq(state->buf, '*'))
|
|
*flag |= LVAR_ANYEND;
|
|
else
|
|
{
|
|
state->state = WAITOPERATOR;
|
|
return VAL;
|
|
}
|
|
break;
|
|
case WAITOPERATOR:
|
|
if (charlen == 1 && (t_iseq(state->buf, '&') || t_iseq(state->buf, '|')))
|
|
{
|
|
state->state = WAITOPERAND;
|
|
*val = (int32) *(state->buf);
|
|
(state->buf)++;
|
|
return OPR;
|
|
}
|
|
else if (charlen == 1 && t_iseq(state->buf, ')'))
|
|
{
|
|
(state->buf)++;
|
|
state->count--;
|
|
return (state->count < 0) ? ERR : CLOSE;
|
|
}
|
|
else if (*(state->buf) == '\0')
|
|
return (state->count) ? ERR : END;
|
|
else if (charlen == 1 && !t_iseq(state->buf, ' '))
|
|
return ERR;
|
|
break;
|
|
default:
|
|
return ERR;
|
|
break;
|
|
}
|
|
|
|
state->buf += charlen;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* push new one in polish notation reverse view
|
|
*/
|
|
static void
|
|
pushquery(QPRS_STATE *state, int32 type, int32 val, int32 distance, int32 lenval, uint16 flag)
|
|
{
|
|
NODE *tmp = (NODE *) palloc(sizeof(NODE));
|
|
|
|
tmp->type = type;
|
|
tmp->val = val;
|
|
tmp->flag = flag;
|
|
if (distance > 0xffff)
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
|
|
errmsg("value is too big")));
|
|
if (lenval > 0xff)
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
|
|
errmsg("operand is too long")));
|
|
tmp->distance = distance;
|
|
tmp->length = lenval;
|
|
tmp->next = state->str;
|
|
state->str = tmp;
|
|
state->num++;
|
|
}
|
|
|
|
/*
|
|
* This function is used for query_txt parsing
|
|
*/
|
|
static void
|
|
pushval_asis(QPRS_STATE *state, int type, char *strval, int lenval, uint16 flag)
|
|
{
|
|
if (lenval > 0xffff)
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
|
|
errmsg("word is too long")));
|
|
|
|
pushquery(state, type, ltree_crc32_sz(strval, lenval),
|
|
state->curop - state->op, lenval, flag);
|
|
|
|
while (state->curop - state->op + lenval + 1 >= state->lenop)
|
|
{
|
|
int32 tmp = state->curop - state->op;
|
|
|
|
state->lenop *= 2;
|
|
state->op = (char *) repalloc((void *) state->op, state->lenop);
|
|
state->curop = state->op + tmp;
|
|
}
|
|
memcpy((void *) state->curop, (void *) strval, lenval);
|
|
state->curop += lenval;
|
|
*(state->curop) = '\0';
|
|
state->curop++;
|
|
state->sumlen += lenval + 1;
|
|
return;
|
|
}
|
|
|
|
#define STACKDEPTH 32
|
|
/*
|
|
* make polish notaion of query
|
|
*/
|
|
static int32
|
|
makepol(QPRS_STATE *state)
|
|
{
|
|
int32 val = 0,
|
|
type;
|
|
int32 lenval = 0;
|
|
char *strval = NULL;
|
|
int32 stack[STACKDEPTH];
|
|
int32 lenstack = 0;
|
|
uint16 flag = 0;
|
|
|
|
/* since this function recurses, it could be driven to stack overflow */
|
|
check_stack_depth();
|
|
|
|
while ((type = gettoken_query(state, &val, &lenval, &strval, &flag)) != END)
|
|
{
|
|
switch (type)
|
|
{
|
|
case VAL:
|
|
pushval_asis(state, VAL, strval, lenval, flag);
|
|
while (lenstack && (stack[lenstack - 1] == (int32) '&' ||
|
|
stack[lenstack - 1] == (int32) '!'))
|
|
{
|
|
lenstack--;
|
|
pushquery(state, OPR, stack[lenstack], 0, 0, 0);
|
|
}
|
|
break;
|
|
case OPR:
|
|
if (lenstack && val == (int32) '|')
|
|
pushquery(state, OPR, val, 0, 0, 0);
|
|
else
|
|
{
|
|
if (lenstack == STACKDEPTH)
|
|
/* internal error */
|
|
elog(ERROR, "stack too short");
|
|
stack[lenstack] = val;
|
|
lenstack++;
|
|
}
|
|
break;
|
|
case OPEN:
|
|
if (makepol(state) == ERR)
|
|
return ERR;
|
|
while (lenstack && (stack[lenstack - 1] == (int32) '&' ||
|
|
stack[lenstack - 1] == (int32) '!'))
|
|
{
|
|
lenstack--;
|
|
pushquery(state, OPR, stack[lenstack], 0, 0, 0);
|
|
}
|
|
break;
|
|
case CLOSE:
|
|
while (lenstack)
|
|
{
|
|
lenstack--;
|
|
pushquery(state, OPR, stack[lenstack], 0, 0, 0);
|
|
};
|
|
return END;
|
|
break;
|
|
case ERR:
|
|
default:
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_SYNTAX_ERROR),
|
|
errmsg("syntax error")));
|
|
|
|
return ERR;
|
|
|
|
}
|
|
}
|
|
while (lenstack)
|
|
{
|
|
lenstack--;
|
|
pushquery(state, OPR, stack[lenstack], 0, 0, 0);
|
|
};
|
|
return END;
|
|
}
|
|
|
|
static void
|
|
findoprnd(ITEM *ptr, int32 *pos)
|
|
{
|
|
/* since this function recurses, it could be driven to stack overflow. */
|
|
check_stack_depth();
|
|
|
|
if (ptr[*pos].type == VAL || ptr[*pos].type == VALTRUE)
|
|
{
|
|
ptr[*pos].left = 0;
|
|
(*pos)++;
|
|
}
|
|
else if (ptr[*pos].val == (int32) '!')
|
|
{
|
|
ptr[*pos].left = 1;
|
|
(*pos)++;
|
|
findoprnd(ptr, pos);
|
|
}
|
|
else
|
|
{
|
|
ITEM *curitem = &ptr[*pos];
|
|
int32 tmp = *pos;
|
|
|
|
(*pos)++;
|
|
findoprnd(ptr, pos);
|
|
curitem->left = *pos - tmp;
|
|
findoprnd(ptr, pos);
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* input
|
|
*/
|
|
static ltxtquery *
|
|
queryin(char *buf)
|
|
{
|
|
QPRS_STATE state;
|
|
int32 i;
|
|
ltxtquery *query;
|
|
int32 commonlen;
|
|
ITEM *ptr;
|
|
NODE *tmp;
|
|
int32 pos = 0;
|
|
|
|
#ifdef BS_DEBUG
|
|
char pbuf[16384],
|
|
*cur;
|
|
#endif
|
|
|
|
/* init state */
|
|
state.buf = buf;
|
|
state.state = WAITOPERAND;
|
|
state.count = 0;
|
|
state.num = 0;
|
|
state.str = NULL;
|
|
|
|
/* init list of operand */
|
|
state.sumlen = 0;
|
|
state.lenop = 64;
|
|
state.curop = state.op = (char *) palloc(state.lenop);
|
|
*(state.curop) = '\0';
|
|
|
|
/* parse query & make polish notation (postfix, but in reverse order) */
|
|
makepol(&state);
|
|
if (!state.num)
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_SYNTAX_ERROR),
|
|
errmsg("syntax error"),
|
|
errdetail("Empty query.")));
|
|
|
|
if (LTXTQUERY_TOO_BIG(state.num, state.sumlen))
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
|
|
errmsg("ltxtquery is too large")));
|
|
commonlen = COMPUTESIZE(state.num, state.sumlen);
|
|
|
|
query = (ltxtquery *) palloc(commonlen);
|
|
SET_VARSIZE(query, commonlen);
|
|
query->size = state.num;
|
|
ptr = GETQUERY(query);
|
|
|
|
/* set item in polish notation */
|
|
for (i = 0; i < state.num; i++)
|
|
{
|
|
ptr[i].type = state.str->type;
|
|
ptr[i].val = state.str->val;
|
|
ptr[i].distance = state.str->distance;
|
|
ptr[i].length = state.str->length;
|
|
ptr[i].flag = state.str->flag;
|
|
tmp = state.str->next;
|
|
pfree(state.str);
|
|
state.str = tmp;
|
|
}
|
|
|
|
/* set user friendly-operand view */
|
|
memcpy((void *) GETOPERAND(query), (void *) state.op, state.sumlen);
|
|
pfree(state.op);
|
|
|
|
/* set left operand's position for every operator */
|
|
pos = 0;
|
|
findoprnd(ptr, &pos);
|
|
|
|
return query;
|
|
}
|
|
|
|
/*
|
|
* in without morphology
|
|
*/
|
|
Datum
|
|
ltxtq_in(PG_FUNCTION_ARGS)
|
|
{
|
|
PG_RETURN_POINTER(queryin((char *) PG_GETARG_POINTER(0)));
|
|
}
|
|
|
|
/*
|
|
* out function
|
|
*/
|
|
typedef struct
|
|
{
|
|
ITEM *curpol;
|
|
char *buf;
|
|
char *cur;
|
|
char *op;
|
|
int32 buflen;
|
|
} INFIX;
|
|
|
|
#define RESIZEBUF(inf,addsize) \
|
|
while( ( (inf)->cur - (inf)->buf ) + (addsize) + 1 >= (inf)->buflen ) \
|
|
{ \
|
|
int32 len = (inf)->cur - (inf)->buf; \
|
|
(inf)->buflen *= 2; \
|
|
(inf)->buf = (char*) repalloc( (void*)(inf)->buf, (inf)->buflen ); \
|
|
(inf)->cur = (inf)->buf + len; \
|
|
}
|
|
|
|
/*
|
|
* recursive walk on tree and print it in
|
|
* infix (human-readable) view
|
|
*/
|
|
static void
|
|
infix(INFIX *in, bool first)
|
|
{
|
|
if (in->curpol->type == VAL)
|
|
{
|
|
char *op = in->op + in->curpol->distance;
|
|
|
|
RESIZEBUF(in, in->curpol->length * 2 + 5);
|
|
while (*op)
|
|
{
|
|
*(in->cur) = *op;
|
|
op++;
|
|
in->cur++;
|
|
}
|
|
if (in->curpol->flag & LVAR_SUBLEXEME)
|
|
{
|
|
*(in->cur) = '%';
|
|
in->cur++;
|
|
}
|
|
if (in->curpol->flag & LVAR_INCASE)
|
|
{
|
|
*(in->cur) = '@';
|
|
in->cur++;
|
|
}
|
|
if (in->curpol->flag & LVAR_ANYEND)
|
|
{
|
|
*(in->cur) = '*';
|
|
in->cur++;
|
|
}
|
|
*(in->cur) = '\0';
|
|
in->curpol++;
|
|
}
|
|
else if (in->curpol->val == (int32) '!')
|
|
{
|
|
bool isopr = false;
|
|
|
|
RESIZEBUF(in, 1);
|
|
*(in->cur) = '!';
|
|
in->cur++;
|
|
*(in->cur) = '\0';
|
|
in->curpol++;
|
|
if (in->curpol->type == OPR)
|
|
{
|
|
isopr = true;
|
|
RESIZEBUF(in, 2);
|
|
sprintf(in->cur, "( ");
|
|
in->cur = strchr(in->cur, '\0');
|
|
}
|
|
infix(in, isopr);
|
|
if (isopr)
|
|
{
|
|
RESIZEBUF(in, 2);
|
|
sprintf(in->cur, " )");
|
|
in->cur = strchr(in->cur, '\0');
|
|
}
|
|
}
|
|
else
|
|
{
|
|
int32 op = in->curpol->val;
|
|
INFIX nrm;
|
|
|
|
in->curpol++;
|
|
if (op == (int32) '|' && !first)
|
|
{
|
|
RESIZEBUF(in, 2);
|
|
sprintf(in->cur, "( ");
|
|
in->cur = strchr(in->cur, '\0');
|
|
}
|
|
|
|
nrm.curpol = in->curpol;
|
|
nrm.op = in->op;
|
|
nrm.buflen = 16;
|
|
nrm.cur = nrm.buf = (char *) palloc(sizeof(char) * nrm.buflen);
|
|
|
|
/* get right operand */
|
|
infix(&nrm, false);
|
|
|
|
/* get & print left operand */
|
|
in->curpol = nrm.curpol;
|
|
infix(in, false);
|
|
|
|
/* print operator & right operand */
|
|
RESIZEBUF(in, 3 + (nrm.cur - nrm.buf));
|
|
sprintf(in->cur, " %c %s", op, nrm.buf);
|
|
in->cur = strchr(in->cur, '\0');
|
|
pfree(nrm.buf);
|
|
|
|
if (op == (int32) '|' && !first)
|
|
{
|
|
RESIZEBUF(in, 2);
|
|
sprintf(in->cur, " )");
|
|
in->cur = strchr(in->cur, '\0');
|
|
}
|
|
}
|
|
}
|
|
|
|
Datum
|
|
ltxtq_out(PG_FUNCTION_ARGS)
|
|
{
|
|
ltxtquery *query = PG_GETARG_LTXTQUERY(0);
|
|
INFIX nrm;
|
|
|
|
if (query->size == 0)
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_SYNTAX_ERROR),
|
|
errmsg("syntax error"),
|
|
errdetail("Empty query.")));
|
|
|
|
nrm.curpol = GETQUERY(query);
|
|
nrm.buflen = 32;
|
|
nrm.cur = nrm.buf = (char *) palloc(sizeof(char) * nrm.buflen);
|
|
*(nrm.cur) = '\0';
|
|
nrm.op = GETOPERAND(query);
|
|
infix(&nrm, true);
|
|
|
|
PG_FREE_IF_COPY(query, 0);
|
|
PG_RETURN_POINTER(nrm.buf);
|
|
}
|