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postgresql/contrib/hstore/hstore_io.c

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#include "hstore.h"
#include <ctype.h>
PG_MODULE_MAGIC;
typedef struct {
char *begin;
char *ptr;
char *cur;
char *word;
int wordlen;
Pairs *pairs;
int pcur;
int plen;
} HSParser;
#define RESIZEPRSBUF \
do { \
if ( state->cur - state->word + 1 >= state->wordlen ) \
{ \
int4 clen = state->cur - state->word; \
state->wordlen *= 2; \
state->word = (char*)repalloc( (void*)state->word, state->wordlen ); \
state->cur = state->word + clen; \
} \
} while (0)
#define GV_WAITVAL 0
#define GV_INVAL 1
#define GV_INESCVAL 2
#define GV_WAITESCIN 3
#define GV_WAITESCESCIN 4
static bool
get_val( HSParser *state, bool ignoreeq, bool *escaped ) {
int st = GV_WAITVAL;
state->wordlen=32;
state->cur = state->word = palloc( state->wordlen );
*escaped=false;
while(1) {
if ( st == GV_WAITVAL ) {
if ( *(state->ptr) == '"' ) {
*escaped=true;
st = GV_INESCVAL;
} else if ( *(state->ptr) == '\0' ) {
return false;
} else if ( *(state->ptr) == '=' && !ignoreeq ) {
elog(ERROR,"Syntax error near '%c' at postion %d", *(state->ptr), (int4)(state->ptr-state->begin));
} else if ( *(state->ptr) == '\\' ) {
st = GV_WAITESCIN;
} else if ( !isspace((unsigned char) *(state->ptr)) ) {
*(state->cur) = *(state->ptr);
state->cur++;
st = GV_INVAL;
}
} else if ( st == GV_INVAL ) {
if ( *(state->ptr) == '\\' ) {
st = GV_WAITESCIN;
} else if ( *(state->ptr) == '=' && !ignoreeq ) {
state->ptr--;
return true;
} else if ( *(state->ptr) == ',' && ignoreeq ) {
state->ptr--;
return true;
} else if ( isspace((unsigned char) *(state->ptr)) ) {
return true;
} else if ( *(state->ptr) == '\0' ) {
state->ptr--;
return true;
} else {
RESIZEPRSBUF;
*(state->cur) = *(state->ptr);
state->cur++;
}
} else if ( st == GV_INESCVAL ) {
if ( *(state->ptr) == '\\' ) {
st = GV_WAITESCESCIN;
} else if ( *(state->ptr) == '"' ) {
return true;
} else if ( *(state->ptr) == '\0' ) {
elog(ERROR,"Unexpected end of string");
} else {
RESIZEPRSBUF;
*(state->cur) = *(state->ptr);
state->cur++;
}
} else if ( st == GV_WAITESCIN ) {
if ( *(state->ptr) == '\0' )
elog(ERROR,"Unexpected end of string");
RESIZEPRSBUF;
*(state->cur) = *(state->ptr);
state->cur++;
st = GV_INVAL;
} else if ( st == GV_WAITESCESCIN ) {
if ( *(state->ptr) == '\0' )
elog(ERROR,"Unexpected end of string");
RESIZEPRSBUF;
*(state->cur) = *(state->ptr);
state->cur++;
st = GV_INESCVAL;
} else
elog(ERROR,"Unknown state %d at postion line %d in file '%s'", st, __LINE__, __FILE__);
state->ptr++;
}
return false;
}
#define WKEY 0
#define WVAL 1
#define WEQ 2
#define WGT 3
#define WDEL 4
static void
parse_hstore( HSParser *state ) {
int st = WKEY;
bool escaped=false;
state->plen=16;
state->pairs = (Pairs*)palloc( sizeof(Pairs) * state->plen );
state->pcur=0;
state->ptr = state->begin;
state->word=NULL;
while(1) {
if (st == WKEY) {
if ( !get_val(state, false, &escaped) )
return;
if ( state->pcur >= state->plen ) {
state->plen *= 2;
state->pairs = (Pairs*)repalloc( state->pairs, sizeof(Pairs) * state->plen );
}
state->pairs[ state->pcur ].key = state->word;
state->pairs[ state->pcur ].keylen = state->cur - state->word;
state->pairs[ state->pcur ].val=NULL;
state->word=NULL;
st = WEQ;
} else if ( st == WEQ ) {
if ( *(state->ptr) == '=' ) {
st = WGT;
} else if ( *(state->ptr) == '\0' ) {
elog(ERROR,"Unexpectd end of string");
} else if (!isspace((unsigned char) *(state->ptr))) {
elog(ERROR,"Syntax error near '%c' at postion %d", *(state->ptr), (int4)(state->ptr-state->begin));
}
} else if ( st == WGT ) {
if ( *(state->ptr) == '>' ) {
st = WVAL;
} else if ( *(state->ptr) == '\0' ) {
elog(ERROR,"Unexpectd end of string");
} else {
elog(ERROR,"Syntax error near '%c' at postion %d", *(state->ptr), (int4)(state->ptr-state->begin));
}
} else if ( st == WVAL ) {
if ( !get_val(state, true, &escaped) )
elog(ERROR,"Unexpected end of string");
state->pairs[ state->pcur ].val = state->word;
state->pairs[ state->pcur ].vallen = state->cur - state->word;
state->pairs[ state->pcur ].isnull = false;
state->pairs[ state->pcur ].needfree = true;
if ( state->cur - state->word == 4 && !escaped) {
state->word[4] = '\0';
if ( 0==pg_strcasecmp(state->word, "null") )
state->pairs[ state->pcur ].isnull=true;
}
state->word=NULL;
state->pcur++;
st = WDEL;
} else if ( st == WDEL ) {
if ( *(state->ptr) == ',' ) {
st = WKEY;
} else if ( *(state->ptr) == '\0' ) {
return;
} else if (!isspace((unsigned char) *(state->ptr))) {
elog(ERROR,"Syntax error near '%c' at postion %d", *(state->ptr), (int4)(state->ptr-state->begin));
}
} else
elog(ERROR,"Unknown state %d at line %d in file '%s'", st, __LINE__, __FILE__);
state->ptr++;
}
}
int
comparePairs(const void *a, const void *b) {
if ( ((Pairs*)a)->keylen == ((Pairs*)b)->keylen ) {
int res = strncmp(
((Pairs*)a)->key,
((Pairs*)b)->key,
((Pairs*)a)->keylen
);
if ( res )
return res;
/* guarantee that neddfree willl be later */
if ( ((Pairs*)b)->needfree == ((Pairs*)a)->needfree )
return 0;
else if ( ((Pairs*)a)->needfree )
return 1;
else
return -1;
}
return ( ((Pairs*)a)->keylen > ((Pairs*)b)->keylen ) ? 1 : -1;
}
int
uniquePairs(Pairs * a, int4 l, int4 *buflen) {
Pairs *ptr, *res;
*buflen=0;
if ( l < 2 ) {
if ( l==1 )
*buflen = a->keylen + ((a->isnull) ? 0 : a->vallen) ;
return l;
}
qsort((void *) a, l, sizeof(Pairs), comparePairs);
ptr=a+1;
res=a;
while( ptr - a < l ) {
if ( ptr->keylen == res->keylen && strncmp( ptr->key, res->key, res->keylen )==0 ) {
if ( ptr->needfree ) {
pfree(ptr->key);
pfree(ptr->val);
}
} else {
*buflen += res->keylen + (( res->isnull ) ? 0 : res->vallen);
res++;
memcpy(res,ptr,sizeof(Pairs));
}
ptr++;
}
*buflen += res->keylen + (( res->isnull ) ? 0 : res->vallen);
return res + 1 - a;
}
static void
freeHSParse(HSParser *state) {
int i;
if ( state->word ) pfree( state->word );
for (i=0;i<state->pcur;i++)
if ( state->pairs[i].needfree ) {
if (state->pairs[i].key) pfree(state->pairs[i].key);
if (state->pairs[i].val) pfree(state->pairs[i].val);
}
pfree( state->pairs );
}
PG_FUNCTION_INFO_V1(hstore_in);
Datum hstore_in(PG_FUNCTION_ARGS);
Datum
hstore_in(PG_FUNCTION_ARGS) {
HSParser state;
int4 len,buflen,i;
HStore *out;
HEntry *entries;
char *ptr;
state.begin = PG_GETARG_CSTRING(0);
parse_hstore(&state);
if ( state.pcur == 0 ) {
freeHSParse(&state);
len = CALCDATASIZE(0,0);
out = palloc(len);
out->len=len;
out->size=0;
PG_RETURN_POINTER(out);
}
state.pcur = uniquePairs(state.pairs, state.pcur, &buflen);
len=CALCDATASIZE(state.pcur, buflen);
out = palloc(len);
out->len=len;
out->size=state.pcur;
entries=ARRPTR(out);
ptr = STRPTR(out);
for(i=0;i<out->size;i++) {
entries[i].keylen = state.pairs[i].keylen;
entries[i].pos = ptr - STRPTR(out);
memcpy(ptr, state.pairs[i].key, state.pairs[i].keylen);
ptr+=entries[i].keylen;
entries[i].valisnull = state.pairs[i].isnull;
if ( entries[i].valisnull )
entries[i].vallen=4; /* null */
else {
entries[i].vallen = state.pairs[i].vallen;
memcpy(ptr, state.pairs[i].val,state.pairs[i].vallen);
ptr+=entries[i].vallen;
}
}
freeHSParse(&state);
PG_RETURN_POINTER(out);
}
static char*
cpw(char *dst, char *src, int len) {
char *ptr = src;
while(ptr-src<len) {
if ( *ptr == '"' || *ptr == '\\' )
*dst++='\\';
*dst++ = *ptr++;
}
return dst;
}
PG_FUNCTION_INFO_V1(hstore_out);
Datum hstore_out(PG_FUNCTION_ARGS);
Datum
hstore_out(PG_FUNCTION_ARGS) {
HStore *in = PG_GETARG_HS(0);
int buflen,i;
char *out,*ptr;
char *base = STRPTR(in);
HEntry *entries = ARRPTR(in);
if ( in->size==0 ) {
out=palloc(1);
*out='\0';
PG_FREE_IF_COPY(in,0);
PG_RETURN_CSTRING(out);
}
buflen = ( 4 /* " */ + 2 /* => */ + 2 /*, */ )*in->size +
2 /* esc */ * ( in->len - CALCDATASIZE(in->size,0) );
out=ptr=palloc(buflen);
for(i=0;i<in->size;i++) {
*ptr++='"';
ptr = cpw( ptr, base + entries[i].pos, entries[i].keylen );
*ptr++='"';
*ptr++='=';
*ptr++='>';
if ( entries[i].valisnull ) {
*ptr++='N';
*ptr++='U';
*ptr++='L';
*ptr++='L';
} else {
*ptr++='"';
ptr = cpw( ptr, base + entries[i].pos + entries[i].keylen, entries[i].vallen );
*ptr++='"';
}
if ( i+1 != in->size ) {
*ptr++=',';
*ptr++=' ';
}
}
*ptr='\0';
PG_FREE_IF_COPY(in,0);
PG_RETURN_CSTRING(out);
}
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