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

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/*-------------------------------------------------------------------------
*
* varlena.c
* Functions for the variable-length built-in types.
*
* Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/utils/adt/varlena.c,v 1.121 2005/05/20 01:29:55 neilc Exp $
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include <ctype.h>
#include "access/tuptoaster.h"
#include "catalog/pg_type.h"
#include "lib/stringinfo.h"
#include "libpq/crypt.h"
#include "libpq/pqformat.h"
#include "mb/pg_wchar.h"
#include "miscadmin.h"
#include "parser/scansup.h"
#include "utils/array.h"
#include "utils/builtins.h"
#include "utils/lsyscache.h"
#include "utils/pg_locale.h"
typedef struct varlena unknown;
#define DatumGetUnknownP(X) ((unknown *) PG_DETOAST_DATUM(X))
#define DatumGetUnknownPCopy(X) ((unknown *) PG_DETOAST_DATUM_COPY(X))
#define PG_GETARG_UNKNOWN_P(n) DatumGetUnknownP(PG_GETARG_DATUM(n))
#define PG_GETARG_UNKNOWN_P_COPY(n) DatumGetUnknownPCopy(PG_GETARG_DATUM(n))
#define PG_RETURN_UNKNOWN_P(x) PG_RETURN_POINTER(x)
#define PG_TEXTARG_GET_STR(arg_) \
DatumGetCString(DirectFunctionCall1(textout, PG_GETARG_DATUM(arg_)))
#define PG_TEXT_GET_STR(textp_) \
DatumGetCString(DirectFunctionCall1(textout, PointerGetDatum(textp_)))
#define PG_STR_GET_TEXT(str_) \
DatumGetTextP(DirectFunctionCall1(textin, CStringGetDatum(str_)))
#define TEXTLEN(textp) \
text_length(PointerGetDatum(textp))
#define TEXTPOS(buf_text, from_sub_text) \
text_position(buf_text, from_sub_text, 1)
#define TEXTDUP(textp) \
DatumGetTextPCopy(PointerGetDatum(textp))
#define LEFT(buf_text, from_sub_text) \
text_substring(PointerGetDatum(buf_text), \
1, \
TEXTPOS(buf_text, from_sub_text) - 1, false)
#define RIGHT(buf_text, from_sub_text, from_sub_text_len) \
text_substring(PointerGetDatum(buf_text), \
TEXTPOS(buf_text, from_sub_text) + (from_sub_text_len), \
-1, true)
static int text_cmp(text *arg1, text *arg2);
static int32 text_length(Datum str);
static int32 text_position(text *t1, text *t2, int matchnum);
static text *text_substring(Datum str,
int32 start,
int32 length,
bool length_not_specified);
/*****************************************************************************
* USER I/O ROUTINES *
*****************************************************************************/
#define VAL(CH) ((CH) - '0')
#define DIG(VAL) ((VAL) + '0')
/*
* byteain - converts from printable representation of byte array
*
* Non-printable characters must be passed as '\nnn' (octal) and are
* converted to internal form. '\' must be passed as '\\'.
* ereport(ERROR, ...) if bad form.
*
* BUGS:
* The input is scaned twice.
* The error checking of input is minimal.
*/
Datum
byteain(PG_FUNCTION_ARGS)
{
char *inputText = PG_GETARG_CSTRING(0);
char *tp;
char *rp;
int byte;
bytea *result;
for (byte = 0, tp = inputText; *tp != '\0'; byte++)
{
if (tp[0] != '\\')
tp++;
else if ((tp[0] == '\\') &&
(tp[1] >= '0' && tp[1] <= '3') &&
(tp[2] >= '0' && tp[2] <= '7') &&
(tp[3] >= '0' && tp[3] <= '7'))
tp += 4;
else if ((tp[0] == '\\') &&
(tp[1] == '\\'))
tp += 2;
else
{
/*
* one backslash, not followed by 0 or ### valid octal
*/
ereport(ERROR,
(errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
errmsg("invalid input syntax for type bytea")));
}
}
byte += VARHDRSZ;
result = (bytea *) palloc(byte);
VARATT_SIZEP(result) = byte; /* set varlena length */
tp = inputText;
rp = VARDATA(result);
while (*tp != '\0')
{
if (tp[0] != '\\')
*rp++ = *tp++;
else if ((tp[0] == '\\') &&
(tp[1] >= '0' && tp[1] <= '3') &&
(tp[2] >= '0' && tp[2] <= '7') &&
(tp[3] >= '0' && tp[3] <= '7'))
{
byte = VAL(tp[1]);
byte <<= 3;
byte += VAL(tp[2]);
byte <<= 3;
*rp++ = byte + VAL(tp[3]);
tp += 4;
}
else if ((tp[0] == '\\') &&
(tp[1] == '\\'))
{
*rp++ = '\\';
tp += 2;
}
else
{
/*
* We should never get here. The first pass should not allow
* it.
*/
ereport(ERROR,
(errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
errmsg("invalid input syntax for type bytea")));
}
}
PG_RETURN_BYTEA_P(result);
}
/*
* byteaout - converts to printable representation of byte array
*
* Non-printable characters are inserted as '\nnn' (octal) and '\' as
* '\\'.
*
* NULL vlena should be an error--returning string with NULL for now.
*/
Datum
byteaout(PG_FUNCTION_ARGS)
{
bytea *vlena = PG_GETARG_BYTEA_P(0);
char *result;
char *vp;
char *rp;
int val; /* holds unprintable chars */
int i;
int len;
len = 1; /* empty string has 1 char */
vp = VARDATA(vlena);
for (i = VARSIZE(vlena) - VARHDRSZ; i != 0; i--, vp++)
{
if (*vp == '\\')
len += 2;
else if ((unsigned char) *vp < 0x20 || (unsigned char) *vp > 0x7e)
len += 4;
else
len++;
}
rp = result = (char *) palloc(len);
vp = VARDATA(vlena);
for (i = VARSIZE(vlena) - VARHDRSZ; i != 0; i--, vp++)
{
if (*vp == '\\')
{
*rp++ = '\\';
*rp++ = '\\';
}
else if ((unsigned char) *vp < 0x20 || (unsigned char) *vp > 0x7e)
{
val = *vp;
rp[0] = '\\';
rp[3] = DIG(val & 07);
val >>= 3;
rp[2] = DIG(val & 07);
val >>= 3;
rp[1] = DIG(val & 03);
rp += 4;
}
else
*rp++ = *vp;
}
*rp = '\0';
PG_RETURN_CSTRING(result);
}
/*
* bytearecv - converts external binary format to bytea
*/
Datum
bytearecv(PG_FUNCTION_ARGS)
{
StringInfo buf = (StringInfo) PG_GETARG_POINTER(0);
bytea *result;
int nbytes;
nbytes = buf->len - buf->cursor;
result = (bytea *) palloc(nbytes + VARHDRSZ);
VARATT_SIZEP(result) = nbytes + VARHDRSZ;
pq_copymsgbytes(buf, VARDATA(result), nbytes);
PG_RETURN_BYTEA_P(result);
}
/*
* byteasend - converts bytea to binary format
*
* This is a special case: just copy the input...
*/
Datum
byteasend(PG_FUNCTION_ARGS)
{
bytea *vlena = PG_GETARG_BYTEA_P_COPY(0);
PG_RETURN_BYTEA_P(vlena);
}
/*
* textin - converts "..." to internal representation
*/
Datum
textin(PG_FUNCTION_ARGS)
{
char *inputText = PG_GETARG_CSTRING(0);
text *result;
int len;
/* verify encoding */
len = strlen(inputText);
pg_verifymbstr(inputText, len, false);
result = (text *) palloc(len + VARHDRSZ);
VARATT_SIZEP(result) = len + VARHDRSZ;
memcpy(VARDATA(result), inputText, len);
PG_RETURN_TEXT_P(result);
}
/*
* textout - converts internal representation to "..."
*/
Datum
textout(PG_FUNCTION_ARGS)
{
text *t = PG_GETARG_TEXT_P(0);
int len;
char *result;
len = VARSIZE(t) - VARHDRSZ;
result = (char *) palloc(len + 1);
memcpy(result, VARDATA(t), len);
result[len] = '\0';
PG_RETURN_CSTRING(result);
}
/*
* textrecv - converts external binary format to text
*/
Datum
textrecv(PG_FUNCTION_ARGS)
{
StringInfo buf = (StringInfo) PG_GETARG_POINTER(0);
text *result;
char *str;
int nbytes;
str = pq_getmsgtext(buf, buf->len - buf->cursor, &nbytes);
result = (text *) palloc(nbytes + VARHDRSZ);
VARATT_SIZEP(result) = nbytes + VARHDRSZ;
memcpy(VARDATA(result), str, nbytes);
pfree(str);
PG_RETURN_TEXT_P(result);
}
/*
* textsend - converts text to binary format
*/
Datum
textsend(PG_FUNCTION_ARGS)
{
text *t = PG_GETARG_TEXT_P(0);
StringInfoData buf;
pq_begintypsend(&buf);
pq_sendtext(&buf, VARDATA(t), VARSIZE(t) - VARHDRSZ);
PG_RETURN_BYTEA_P(pq_endtypsend(&buf));
}
/*
* unknownin - converts "..." to internal representation
*/
Datum
unknownin(PG_FUNCTION_ARGS)
{
char *inputStr = PG_GETARG_CSTRING(0);
unknown *result;
int len;
len = strlen(inputStr) + VARHDRSZ;
result = (unknown *) palloc(len);
VARATT_SIZEP(result) = len;
memcpy(VARDATA(result), inputStr, len - VARHDRSZ);
PG_RETURN_UNKNOWN_P(result);
}
/*
* unknownout - converts internal representation to "..."
*/
Datum
unknownout(PG_FUNCTION_ARGS)
{
unknown *t = PG_GETARG_UNKNOWN_P(0);
int len;
char *result;
len = VARSIZE(t) - VARHDRSZ;
result = (char *) palloc(len + 1);
memcpy(result, VARDATA(t), len);
result[len] = '\0';
PG_RETURN_CSTRING(result);
}
/*
* unknownrecv - converts external binary format to unknown
*/
Datum
unknownrecv(PG_FUNCTION_ARGS)
{
StringInfo buf = (StringInfo) PG_GETARG_POINTER(0);
unknown *result;
int nbytes;
nbytes = buf->len - buf->cursor;
result = (unknown *) palloc(nbytes + VARHDRSZ);
VARATT_SIZEP(result) = nbytes + VARHDRSZ;
pq_copymsgbytes(buf, VARDATA(result), nbytes);
PG_RETURN_UNKNOWN_P(result);
}
/*
* unknownsend - converts unknown to binary format
*
* This is a special case: just copy the input, since it's
* effectively the same format as bytea
*/
Datum
unknownsend(PG_FUNCTION_ARGS)
{
unknown *vlena = PG_GETARG_UNKNOWN_P_COPY(0);
PG_RETURN_UNKNOWN_P(vlena);
}
/* ========== PUBLIC ROUTINES ========== */
/*
* textlen -
* returns the logical length of a text*
* (which is less than the VARSIZE of the text*)
*/
Datum
textlen(PG_FUNCTION_ARGS)
{
Datum str = PG_GETARG_DATUM(0);
/* try to avoid decompressing argument */
PG_RETURN_INT32(text_length(str));
}
/*
* text_length -
* Does the real work for textlen()
*
* This is broken out so it can be called directly by other string processing
* functions. Note that the argument is passed as a Datum, to indicate that
* it may still be in compressed form. We can avoid decompressing it at all
* in some cases.
*/
static int32
text_length(Datum str)
{
/* fastpath when max encoding length is one */
if (pg_database_encoding_max_length() == 1)
PG_RETURN_INT32(toast_raw_datum_size(str) - VARHDRSZ);
else
{
text *t = DatumGetTextP(str);
PG_RETURN_INT32(pg_mbstrlen_with_len(VARDATA(t),
VARSIZE(t) - VARHDRSZ));
}
}
/*
* textoctetlen -
* returns the physical length of a text*
* (which is less than the VARSIZE of the text*)
*/
Datum
textoctetlen(PG_FUNCTION_ARGS)
{
Datum str = PG_GETARG_DATUM(0);
/* We need not detoast the input at all */
PG_RETURN_INT32(toast_raw_datum_size(str) - VARHDRSZ);
}
/*
* textcat -
* takes two text* and returns a text* that is the concatenation of
* the two.
*
* Rewritten by Sapa, sapa@hq.icb.chel.su. 8-Jul-96.
* Updated by Thomas, Thomas.Lockhart@jpl.nasa.gov 1997-07-10.
* Allocate space for output in all cases.
* XXX - thomas 1997-07-10
*/
Datum
textcat(PG_FUNCTION_ARGS)
{
text *t1 = PG_GETARG_TEXT_P(0);
text *t2 = PG_GETARG_TEXT_P(1);
int len1,
len2,
len;
text *result;
char *ptr;
len1 = (VARSIZE(t1) - VARHDRSZ);
if (len1 < 0)
len1 = 0;
len2 = (VARSIZE(t2) - VARHDRSZ);
if (len2 < 0)
len2 = 0;
len = len1 + len2 + VARHDRSZ;
result = (text *) palloc(len);
/* Set size of result string... */
VARATT_SIZEP(result) = len;
/* Fill data field of result string... */
ptr = VARDATA(result);
if (len1 > 0)
memcpy(ptr, VARDATA(t1), len1);
if (len2 > 0)
memcpy(ptr + len1, VARDATA(t2), len2);
PG_RETURN_TEXT_P(result);
}
/*
* text_substr()
* Return a substring starting at the specified position.
* - thomas 1997-12-31
*
* Input:
* - string
* - starting position (is one-based)
* - string length
*
* If the starting position is zero or less, then return from the start of the string
* adjusting the length to be consistent with the "negative start" per SQL92.
* If the length is less than zero, return the remaining string.
*
* Added multibyte support.
* - Tatsuo Ishii 1998-4-21
* Changed behavior if starting position is less than one to conform to SQL92 behavior.
* Formerly returned the entire string; now returns a portion.
* - Thomas Lockhart 1998-12-10
* Now uses faster TOAST-slicing interface
* - John Gray 2002-02-22
* Remove "#ifdef MULTIBYTE" and test for encoding_max_length instead. Change
* behaviors conflicting with SQL92 to meet SQL92 (if E = S + L < S throw
* error; if E < 1, return '', not entire string). Fixed MB related bug when
* S > LC and < LC + 4 sometimes garbage characters are returned.
* - Joe Conway 2002-08-10
*/
Datum
text_substr(PG_FUNCTION_ARGS)
{
PG_RETURN_TEXT_P(text_substring(PG_GETARG_DATUM(0),
PG_GETARG_INT32(1),
PG_GETARG_INT32(2),
false));
}
/*
* text_substr_no_len -
* Wrapper to avoid opr_sanity failure due to
* one function accepting a different number of args.
*/
Datum
text_substr_no_len(PG_FUNCTION_ARGS)
{
PG_RETURN_TEXT_P(text_substring(PG_GETARG_DATUM(0),
PG_GETARG_INT32(1),
-1, true));
}
/*
* text_substring -
* Does the real work for text_substr() and text_substr_no_len()
*
* This is broken out so it can be called directly by other string processing
* functions. Note that the argument is passed as a Datum, to indicate that
* it may still be in compressed/toasted form. We can avoid detoasting all
* of it in some cases.
*/
static text *
text_substring(Datum str, int32 start, int32 length, bool length_not_specified)
{
int32 eml = pg_database_encoding_max_length();
int32 S = start; /* start position */
int32 S1; /* adjusted start position */
int32 L1; /* adjusted substring length */
/* life is easy if the encoding max length is 1 */
if (eml == 1)
{
S1 = Max(S, 1);
if (length_not_specified) /* special case - get length to
* end of string */
L1 = -1;
else
{
/* end position */
int E = S + length;
/*
* A negative value for L is the only way for the end position
* to be before the start. SQL99 says to throw an error.
*/
if (E < S)
ereport(ERROR,
(errcode(ERRCODE_SUBSTRING_ERROR),
errmsg("negative substring length not allowed")));
/*
* A zero or negative value for the end position can happen if
* the start was negative or one. SQL99 says to return a
* zero-length string.
*/
if (E < 1)
return PG_STR_GET_TEXT("");
L1 = E - S1;
}
/*
* If the start position is past the end of the string, SQL99 says
* to return a zero-length string -- PG_GETARG_TEXT_P_SLICE() will
* do that for us. Convert to zero-based starting position
*/
return DatumGetTextPSlice(str, S1 - 1, L1);
}
else if (eml > 1)
{
/*
* When encoding max length is > 1, we can't get LC without
* detoasting, so we'll grab a conservatively large slice now and
* go back later to do the right thing
*/
int32 slice_start;
int32 slice_size;
int32 slice_strlen;
text *slice;
int32 E1;
int32 i;
char *p;
char *s;
text *ret;
/*
* if S is past the end of the string, the tuple toaster will
* return a zero-length string to us
*/
S1 = Max(S, 1);
/*
* We need to start at position zero because there is no way to
* know in advance which byte offset corresponds to the supplied
* start position.
*/
slice_start = 0;
if (length_not_specified) /* special case - get length to
* end of string */
slice_size = L1 = -1;
else
{
int E = S + length;
/*
* A negative value for L is the only way for the end position
* to be before the start. SQL99 says to throw an error.
*/
if (E < S)
ereport(ERROR,
(errcode(ERRCODE_SUBSTRING_ERROR),
errmsg("negative substring length not allowed")));
/*
* A zero or negative value for the end position can happen if
* the start was negative or one. SQL99 says to return a
* zero-length string.
*/
if (E < 1)
return PG_STR_GET_TEXT("");
/*
* if E is past the end of the string, the tuple toaster will
* truncate the length for us
*/
L1 = E - S1;
/*
* Total slice size in bytes can't be any longer than the
* start position plus substring length times the encoding max
* length.
*/
slice_size = (S1 + L1) * eml;
}
slice = DatumGetTextPSlice(str, slice_start, slice_size);
/* see if we got back an empty string */
if ((VARSIZE(slice) - VARHDRSZ) == 0)
return PG_STR_GET_TEXT("");
/* Now we can get the actual length of the slice in MB characters */
slice_strlen = pg_mbstrlen_with_len(VARDATA(slice), VARSIZE(slice) - VARHDRSZ);
/*
* Check that the start position wasn't > slice_strlen. If so,
* SQL99 says to return a zero-length string.
*/
if (S1 > slice_strlen)
return PG_STR_GET_TEXT("");
/*
* Adjust L1 and E1 now that we know the slice string length.
* Again remember that S1 is one based, and slice_start is zero
* based.
*/
if (L1 > -1)
E1 = Min(S1 + L1, slice_start + 1 + slice_strlen);
else
E1 = slice_start + 1 + slice_strlen;
/*
* Find the start position in the slice; remember S1 is not zero
* based
*/
p = VARDATA(slice);
for (i = 0; i < S1 - 1; i++)
p += pg_mblen(p);
/* hang onto a pointer to our start position */
s = p;
/*
* Count the actual bytes used by the substring of the requested
* length.
*/
for (i = S1; i < E1; i++)
p += pg_mblen(p);
ret = (text *) palloc(VARHDRSZ + (p - s));
VARATT_SIZEP(ret) = VARHDRSZ + (p - s);
memcpy(VARDATA(ret), s, (p - s));
return ret;
}
else
elog(ERROR, "invalid backend encoding: encoding max length < 1");
/* not reached: suppress compiler warning */
return NULL;
}
/*
* textpos -
* Return the position of the specified substring.
* Implements the SQL92 POSITION() function.
* Ref: A Guide To The SQL Standard, Date & Darwen, 1997
* - thomas 1997-07-27
*/
Datum
textpos(PG_FUNCTION_ARGS)
{
text *str = PG_GETARG_TEXT_P(0);
text *search_str = PG_GETARG_TEXT_P(1);
PG_RETURN_INT32(text_position(str, search_str, 1));
}
/*
* text_position -
* Does the real work for textpos()
*
* Inputs:
* t1 - string to be searched
* t2 - pattern to match within t1
* matchnum - number of the match to be found (1 is the first match)
* Result:
* Character index of the first matched char, starting from 1,
* or 0 if no match.
*
* This is broken out so it can be called directly by other string processing
* functions.
*/
static int32
text_position(text *t1, text *t2, int matchnum)
{
int match = 0,
pos = 0,
p,
px,
len1,
len2;
if (matchnum <= 0)
return 0; /* result for 0th match */
if (VARSIZE(t2) <= VARHDRSZ)
return 1; /* result for empty pattern */
len1 = (VARSIZE(t1) - VARHDRSZ);
len2 = (VARSIZE(t2) - VARHDRSZ);
if (pg_database_encoding_max_length() == 1)
{
/* simple case - single byte encoding */
char *p1,
*p2;
p1 = VARDATA(t1);
p2 = VARDATA(t2);
/* no use in searching str past point where search_str will fit */
px = (len1 - len2);
for (p = 0; p <= px; p++)
{
if ((*p1 == *p2) && (strncmp(p1, p2, len2) == 0))
{
if (++match == matchnum)
{
pos = p + 1;
break;
}
}
p1++;
}
}
else
{
/* not as simple - multibyte encoding */
pg_wchar *p1,
*p2,
*ps1,
*ps2;
ps1 = p1 = (pg_wchar *) palloc((len1 + 1) * sizeof(pg_wchar));
(void) pg_mb2wchar_with_len((unsigned char *) VARDATA(t1), p1, len1);
len1 = pg_wchar_strlen(p1);
ps2 = p2 = (pg_wchar *) palloc((len2 + 1) * sizeof(pg_wchar));
(void) pg_mb2wchar_with_len((unsigned char *) VARDATA(t2), p2, len2);
len2 = pg_wchar_strlen(p2);
/* no use in searching str past point where search_str will fit */
px = (len1 - len2);
for (p = 0; p <= px; p++)
{
if ((*p1 == *p2) && (pg_wchar_strncmp(p1, p2, len2) == 0))
{
if (++match == matchnum)
{
pos = p + 1;
break;
}
}
p1++;
}
pfree(ps1);
pfree(ps2);
}
return pos;
}
/* varstr_cmp()
* Comparison function for text strings with given lengths.
* Includes locale support, but must copy strings to temporary memory
* to allow null-termination for inputs to strcoll().
* Returns -1, 0 or 1
*/
int
varstr_cmp(char *arg1, int len1, char *arg2, int len2)
{
int result;
/*
* Unfortunately, there is no strncoll(), so in the non-C locale case
* we have to do some memory copying. This turns out to be
* significantly slower, so we optimize the case where LC_COLLATE is
* C. We also try to optimize relatively-short strings by avoiding
* palloc/pfree overhead.
*/
#define STACKBUFLEN 1024
if (!lc_collate_is_c())
{
char a1buf[STACKBUFLEN];
char a2buf[STACKBUFLEN];
char *a1p,
*a2p;
if (len1 >= STACKBUFLEN)
a1p = (char *) palloc(len1 + 1);
else
a1p = a1buf;
if (len2 >= STACKBUFLEN)
a2p = (char *) palloc(len2 + 1);
else
a2p = a2buf;
memcpy(a1p, arg1, len1);
a1p[len1] = '\0';
memcpy(a2p, arg2, len2);
a2p[len2] = '\0';
result = strcoll(a1p, a2p);
if (len1 >= STACKBUFLEN)
pfree(a1p);
if (len2 >= STACKBUFLEN)
pfree(a2p);
}
else
{
result = strncmp(arg1, arg2, Min(len1, len2));
if ((result == 0) && (len1 != len2))
result = (len1 < len2) ? -1 : 1;
}
return result;
}
/* text_cmp()
* Internal comparison function for text strings.
* Returns -1, 0 or 1
*/
static int
text_cmp(text *arg1, text *arg2)
{
char *a1p,
*a2p;
int len1,
len2;
a1p = VARDATA(arg1);
a2p = VARDATA(arg2);
len1 = VARSIZE(arg1) - VARHDRSZ;
len2 = VARSIZE(arg2) - VARHDRSZ;
return varstr_cmp(a1p, len1, a2p, len2);
}
/*
* Comparison functions for text strings.
*
* Note: btree indexes need these routines not to leak memory; therefore,
* be careful to free working copies of toasted datums. Most places don't
* need to be so careful.
*/
Datum
texteq(PG_FUNCTION_ARGS)
{
text *arg1 = PG_GETARG_TEXT_P(0);
text *arg2 = PG_GETARG_TEXT_P(1);
bool result;
/* fast path for different-length inputs */
if (VARSIZE(arg1) != VARSIZE(arg2))
result = false;
else
result = (text_cmp(arg1, arg2) == 0);
PG_FREE_IF_COPY(arg1, 0);
PG_FREE_IF_COPY(arg2, 1);
PG_RETURN_BOOL(result);
}
Datum
textne(PG_FUNCTION_ARGS)
{
text *arg1 = PG_GETARG_TEXT_P(0);
text *arg2 = PG_GETARG_TEXT_P(1);
bool result;
/* fast path for different-length inputs */
if (VARSIZE(arg1) != VARSIZE(arg2))
result = true;
else
result = (text_cmp(arg1, arg2) != 0);
PG_FREE_IF_COPY(arg1, 0);
PG_FREE_IF_COPY(arg2, 1);
PG_RETURN_BOOL(result);
}
Datum
text_lt(PG_FUNCTION_ARGS)
{
text *arg1 = PG_GETARG_TEXT_P(0);
text *arg2 = PG_GETARG_TEXT_P(1);
bool result;
result = (text_cmp(arg1, arg2) < 0);
PG_FREE_IF_COPY(arg1, 0);
PG_FREE_IF_COPY(arg2, 1);
PG_RETURN_BOOL(result);
}
Datum
text_le(PG_FUNCTION_ARGS)
{
text *arg1 = PG_GETARG_TEXT_P(0);
text *arg2 = PG_GETARG_TEXT_P(1);
bool result;
result = (text_cmp(arg1, arg2) <= 0);
PG_FREE_IF_COPY(arg1, 0);
PG_FREE_IF_COPY(arg2, 1);
PG_RETURN_BOOL(result);
}
Datum
text_gt(PG_FUNCTION_ARGS)
{
text *arg1 = PG_GETARG_TEXT_P(0);
text *arg2 = PG_GETARG_TEXT_P(1);
bool result;
result = (text_cmp(arg1, arg2) > 0);
PG_FREE_IF_COPY(arg1, 0);
PG_FREE_IF_COPY(arg2, 1);
PG_RETURN_BOOL(result);
}
Datum
text_ge(PG_FUNCTION_ARGS)
{
text *arg1 = PG_GETARG_TEXT_P(0);
text *arg2 = PG_GETARG_TEXT_P(1);
bool result;
result = (text_cmp(arg1, arg2) >= 0);
PG_FREE_IF_COPY(arg1, 0);
PG_FREE_IF_COPY(arg2, 1);
PG_RETURN_BOOL(result);
}
Datum
bttextcmp(PG_FUNCTION_ARGS)
{
text *arg1 = PG_GETARG_TEXT_P(0);
text *arg2 = PG_GETARG_TEXT_P(1);
int32 result;
result = text_cmp(arg1, arg2);
PG_FREE_IF_COPY(arg1, 0);
PG_FREE_IF_COPY(arg2, 1);
PG_RETURN_INT32(result);
}
Datum
text_larger(PG_FUNCTION_ARGS)
{
text *arg1 = PG_GETARG_TEXT_P(0);
text *arg2 = PG_GETARG_TEXT_P(1);
text *result;
result = ((text_cmp(arg1, arg2) > 0) ? arg1 : arg2);
PG_RETURN_TEXT_P(result);
}
Datum
text_smaller(PG_FUNCTION_ARGS)
{
text *arg1 = PG_GETARG_TEXT_P(0);
text *arg2 = PG_GETARG_TEXT_P(1);
text *result;
result = ((text_cmp(arg1, arg2) < 0) ? arg1 : arg2);
PG_RETURN_TEXT_P(result);
}
/*
* The following operators support character-by-character comparison
* of text data types, to allow building indexes suitable for LIKE
* clauses.
*/
static int
internal_text_pattern_compare(text *arg1, text *arg2)
{
int result;
result = memcmp(VARDATA(arg1), VARDATA(arg2),
Min(VARSIZE(arg1), VARSIZE(arg2)) - VARHDRSZ);
if (result != 0)
return result;
else if (VARSIZE(arg1) < VARSIZE(arg2))
return -1;
else if (VARSIZE(arg1) > VARSIZE(arg2))
return 1;
else
return 0;
}
Datum
text_pattern_lt(PG_FUNCTION_ARGS)
{
text *arg1 = PG_GETARG_TEXT_P(0);
text *arg2 = PG_GETARG_TEXT_P(1);
int result;
result = internal_text_pattern_compare(arg1, arg2);
PG_FREE_IF_COPY(arg1, 0);
PG_FREE_IF_COPY(arg2, 1);
PG_RETURN_BOOL(result < 0);
}
Datum
text_pattern_le(PG_FUNCTION_ARGS)
{
text *arg1 = PG_GETARG_TEXT_P(0);
text *arg2 = PG_GETARG_TEXT_P(1);
int result;
result = internal_text_pattern_compare(arg1, arg2);
PG_FREE_IF_COPY(arg1, 0);
PG_FREE_IF_COPY(arg2, 1);
PG_RETURN_BOOL(result <= 0);
}
Datum
text_pattern_eq(PG_FUNCTION_ARGS)
{
text *arg1 = PG_GETARG_TEXT_P(0);
text *arg2 = PG_GETARG_TEXT_P(1);
int result;
if (VARSIZE(arg1) != VARSIZE(arg2))
result = 1;
else
result = internal_text_pattern_compare(arg1, arg2);
PG_FREE_IF_COPY(arg1, 0);
PG_FREE_IF_COPY(arg2, 1);
PG_RETURN_BOOL(result == 0);
}
Datum
text_pattern_ge(PG_FUNCTION_ARGS)
{
text *arg1 = PG_GETARG_TEXT_P(0);
text *arg2 = PG_GETARG_TEXT_P(1);
int result;
result = internal_text_pattern_compare(arg1, arg2);
PG_FREE_IF_COPY(arg1, 0);
PG_FREE_IF_COPY(arg2, 1);
PG_RETURN_BOOL(result >= 0);
}
Datum
text_pattern_gt(PG_FUNCTION_ARGS)
{
text *arg1 = PG_GETARG_TEXT_P(0);
text *arg2 = PG_GETARG_TEXT_P(1);
int result;
result = internal_text_pattern_compare(arg1, arg2);
PG_FREE_IF_COPY(arg1, 0);
PG_FREE_IF_COPY(arg2, 1);
PG_RETURN_BOOL(result > 0);
}
Datum
text_pattern_ne(PG_FUNCTION_ARGS)
{
text *arg1 = PG_GETARG_TEXT_P(0);
text *arg2 = PG_GETARG_TEXT_P(1);
int result;
if (VARSIZE(arg1) != VARSIZE(arg2))
result = 1;
else
result = internal_text_pattern_compare(arg1, arg2);
PG_FREE_IF_COPY(arg1, 0);
PG_FREE_IF_COPY(arg2, 1);
PG_RETURN_BOOL(result != 0);
}
Datum
bttext_pattern_cmp(PG_FUNCTION_ARGS)
{
text *arg1 = PG_GETARG_TEXT_P(0);
text *arg2 = PG_GETARG_TEXT_P(1);
int result;
result = internal_text_pattern_compare(arg1, arg2);
PG_FREE_IF_COPY(arg1, 0);
PG_FREE_IF_COPY(arg2, 1);
PG_RETURN_INT32(result);
}
/*-------------------------------------------------------------
* byteaoctetlen
*
* get the number of bytes contained in an instance of type 'bytea'
*-------------------------------------------------------------
*/
Datum
byteaoctetlen(PG_FUNCTION_ARGS)
{
Datum str = PG_GETARG_DATUM(0);
/* We need not detoast the input at all */
PG_RETURN_INT32(toast_raw_datum_size(str) - VARHDRSZ);
}
/*
* byteacat -
* takes two bytea* and returns a bytea* that is the concatenation of
* the two.
*
* Cloned from textcat and modified as required.
*/
Datum
byteacat(PG_FUNCTION_ARGS)
{
bytea *t1 = PG_GETARG_BYTEA_P(0);
bytea *t2 = PG_GETARG_BYTEA_P(1);
int len1,
len2,
len;
bytea *result;
char *ptr;
len1 = (VARSIZE(t1) - VARHDRSZ);
if (len1 < 0)
len1 = 0;
len2 = (VARSIZE(t2) - VARHDRSZ);
if (len2 < 0)
len2 = 0;
len = len1 + len2 + VARHDRSZ;
result = (bytea *) palloc(len);
/* Set size of result string... */
VARATT_SIZEP(result) = len;
/* Fill data field of result string... */
ptr = VARDATA(result);
if (len1 > 0)
memcpy(ptr, VARDATA(t1), len1);
if (len2 > 0)
memcpy(ptr + len1, VARDATA(t2), len2);
PG_RETURN_BYTEA_P(result);
}
#define PG_STR_GET_BYTEA(str_) \
DatumGetByteaP(DirectFunctionCall1(byteain, CStringGetDatum(str_)))
/*
* bytea_substr()
* Return a substring starting at the specified position.
* Cloned from text_substr and modified as required.
*
* Input:
* - string
* - starting position (is one-based)
* - string length (optional)
*
* If the starting position is zero or less, then return from the start of the string
* adjusting the length to be consistent with the "negative start" per SQL92.
* If the length is less than zero, an ERROR is thrown. If no third argument
* (length) is provided, the length to the end of the string is assumed.
*/
Datum
bytea_substr(PG_FUNCTION_ARGS)
{
int S = PG_GETARG_INT32(1); /* start position */
int S1; /* adjusted start position */
int L1; /* adjusted substring length */
S1 = Max(S, 1);
if (fcinfo->nargs == 2)
{
/*
* Not passed a length - PG_GETARG_BYTEA_P_SLICE() grabs
* everything to the end of the string if we pass it a negative
* value for length.
*/
L1 = -1;
}
else
{
/* end position */
int E = S + PG_GETARG_INT32(2);
/*
* A negative value for L is the only way for the end position to
* be before the start. SQL99 says to throw an error.
*/
if (E < S)
ereport(ERROR,
(errcode(ERRCODE_SUBSTRING_ERROR),
errmsg("negative substring length not allowed")));
/*
* A zero or negative value for the end position can happen if the
* start was negative or one. SQL99 says to return a zero-length
* string.
*/
if (E < 1)
PG_RETURN_BYTEA_P(PG_STR_GET_BYTEA(""));
L1 = E - S1;
}
/*
* If the start position is past the end of the string, SQL99 says to
* return a zero-length string -- PG_GETARG_TEXT_P_SLICE() will do
* that for us. Convert to zero-based starting position
*/
PG_RETURN_BYTEA_P(PG_GETARG_BYTEA_P_SLICE(0, S1 - 1, L1));
}
/*
* bytea_substr_no_len -
* Wrapper to avoid opr_sanity failure due to
* one function accepting a different number of args.
*/
Datum
bytea_substr_no_len(PG_FUNCTION_ARGS)
{
return bytea_substr(fcinfo);
}
/*
* byteapos -
* Return the position of the specified substring.
* Implements the SQL92 POSITION() function.
* Cloned from textpos and modified as required.
*/
Datum
byteapos(PG_FUNCTION_ARGS)
{
bytea *t1 = PG_GETARG_BYTEA_P(0);
bytea *t2 = PG_GETARG_BYTEA_P(1);
int pos;
int px,
p;
int len1,
len2;
char *p1,
*p2;
if (VARSIZE(t2) <= VARHDRSZ)
PG_RETURN_INT32(1); /* result for empty pattern */
len1 = (VARSIZE(t1) - VARHDRSZ);
len2 = (VARSIZE(t2) - VARHDRSZ);
p1 = VARDATA(t1);
p2 = VARDATA(t2);
pos = 0;
px = (len1 - len2);
for (p = 0; p <= px; p++)
{
if ((*p2 == *p1) && (memcmp(p1, p2, len2) == 0))
{
pos = p + 1;
break;
};
p1++;
};
PG_RETURN_INT32(pos);
}
/*-------------------------------------------------------------
* byteaGetByte
*
* this routine treats "bytea" as an array of bytes.
* It returns the Nth byte (a number between 0 and 255).
*-------------------------------------------------------------
*/
Datum
byteaGetByte(PG_FUNCTION_ARGS)
{
bytea *v = PG_GETARG_BYTEA_P(0);
int32 n = PG_GETARG_INT32(1);
int len;
int byte;
len = VARSIZE(v) - VARHDRSZ;
if (n < 0 || n >= len)
ereport(ERROR,
(errcode(ERRCODE_ARRAY_SUBSCRIPT_ERROR),
errmsg("index %d out of valid range, 0..%d",
n, len - 1)));
byte = ((unsigned char *) VARDATA(v))[n];
PG_RETURN_INT32(byte);
}
/*-------------------------------------------------------------
* byteaGetBit
*
* This routine treats a "bytea" type like an array of bits.
* It returns the value of the Nth bit (0 or 1).
*
*-------------------------------------------------------------
*/
Datum
byteaGetBit(PG_FUNCTION_ARGS)
{
bytea *v = PG_GETARG_BYTEA_P(0);
int32 n = PG_GETARG_INT32(1);
int byteNo,
bitNo;
int len;
int byte;
len = VARSIZE(v) - VARHDRSZ;
if (n < 0 || n >= len * 8)
ereport(ERROR,
(errcode(ERRCODE_ARRAY_SUBSCRIPT_ERROR),
errmsg("index %d out of valid range, 0..%d",
n, len * 8 - 1)));
byteNo = n / 8;
bitNo = n % 8;
byte = ((unsigned char *) VARDATA(v))[byteNo];
if (byte & (1 << bitNo))
PG_RETURN_INT32(1);
else
PG_RETURN_INT32(0);
}
/*-------------------------------------------------------------
* byteaSetByte
*
* Given an instance of type 'bytea' creates a new one with
* the Nth byte set to the given value.
*
*-------------------------------------------------------------
*/
Datum
byteaSetByte(PG_FUNCTION_ARGS)
{
bytea *v = PG_GETARG_BYTEA_P(0);
int32 n = PG_GETARG_INT32(1);
int32 newByte = PG_GETARG_INT32(2);
int len;
bytea *res;
len = VARSIZE(v) - VARHDRSZ;
if (n < 0 || n >= len)
ereport(ERROR,
(errcode(ERRCODE_ARRAY_SUBSCRIPT_ERROR),
errmsg("index %d out of valid range, 0..%d",
n, len - 1)));
/*
* Make a copy of the original varlena.
*/
res = (bytea *) palloc(VARSIZE(v));
memcpy((char *) res, (char *) v, VARSIZE(v));
/*
* Now set the byte.
*/
((unsigned char *) VARDATA(res))[n] = newByte;
PG_RETURN_BYTEA_P(res);
}
/*-------------------------------------------------------------
* byteaSetBit
*
* Given an instance of type 'bytea' creates a new one with
* the Nth bit set to the given value.
*
*-------------------------------------------------------------
*/
Datum
byteaSetBit(PG_FUNCTION_ARGS)
{
bytea *v = PG_GETARG_BYTEA_P(0);
int32 n = PG_GETARG_INT32(1);
int32 newBit = PG_GETARG_INT32(2);
bytea *res;
int len;
int oldByte,
newByte;
int byteNo,
bitNo;
len = VARSIZE(v) - VARHDRSZ;
if (n < 0 || n >= len * 8)
ereport(ERROR,
(errcode(ERRCODE_ARRAY_SUBSCRIPT_ERROR),
errmsg("index %d out of valid range, 0..%d",
n, len * 8 - 1)));
byteNo = n / 8;
bitNo = n % 8;
/*
* sanity check!
*/
if (newBit != 0 && newBit != 1)
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("new bit must be 0 or 1")));
/*
* Make a copy of the original varlena.
*/
res = (bytea *) palloc(VARSIZE(v));
memcpy((char *) res, (char *) v, VARSIZE(v));
/*
* Update the byte.
*/
oldByte = ((unsigned char *) VARDATA(res))[byteNo];
if (newBit == 0)
newByte = oldByte & (~(1 << bitNo));
else
newByte = oldByte | (1 << bitNo);
((unsigned char *) VARDATA(res))[byteNo] = newByte;
PG_RETURN_BYTEA_P(res);
}
/* text_name()
* Converts a text type to a Name type.
*/
Datum
text_name(PG_FUNCTION_ARGS)
{
text *s = PG_GETARG_TEXT_P(0);
Name result;
int len;
len = VARSIZE(s) - VARHDRSZ;
/* Truncate oversize input */
if (len >= NAMEDATALEN)
len = NAMEDATALEN - 1;
#ifdef STRINGDEBUG
printf("text- convert string length %d (%d) ->%d\n",
VARSIZE(s) - VARHDRSZ, VARSIZE(s), len);
#endif
result = (Name) palloc(NAMEDATALEN);
memcpy(NameStr(*result), VARDATA(s), len);
/* now null pad to full length... */
while (len < NAMEDATALEN)
{
*(NameStr(*result) + len) = '\0';
len++;
}
PG_RETURN_NAME(result);
}
/* name_text()
* Converts a Name type to a text type.
*/
Datum
name_text(PG_FUNCTION_ARGS)
{
Name s = PG_GETARG_NAME(0);
text *result;
int len;
len = strlen(NameStr(*s));
#ifdef STRINGDEBUG
printf("text- convert string length %d (%d) ->%d\n",
VARSIZE(s) - VARHDRSZ, VARSIZE(s), len);
#endif
result = palloc(VARHDRSZ + len);
VARATT_SIZEP(result) = VARHDRSZ + len;
memcpy(VARDATA(result), NameStr(*s), len);
PG_RETURN_TEXT_P(result);
}
/*
* textToQualifiedNameList - convert a text object to list of names
*
* This implements the input parsing needed by nextval() and other
* functions that take a text parameter representing a qualified name.
* We split the name at dots, downcase if not double-quoted, and
* truncate names if they're too long.
*/
List *
textToQualifiedNameList(text *textval, const char *caller)
{
char *rawname;
List *result = NIL;
List *namelist;
ListCell *l;
/* Convert to C string (handles possible detoasting). */
/* Note we rely on being able to modify rawname below. */
rawname = DatumGetCString(DirectFunctionCall1(textout,
PointerGetDatum(textval)));
if (!SplitIdentifierString(rawname, '.', &namelist))
ereport(ERROR,
(errcode(ERRCODE_INVALID_NAME),
errmsg("invalid name syntax")));
if (namelist == NIL)
ereport(ERROR,
(errcode(ERRCODE_INVALID_NAME),
errmsg("invalid name syntax")));
foreach(l, namelist)
{
char *curname = (char *) lfirst(l);
result = lappend(result, makeString(pstrdup(curname)));
}
pfree(rawname);
list_free(namelist);
return result;
}
/*
* SplitIdentifierString --- parse a string containing identifiers
*
* This is the guts of textToQualifiedNameList, and is exported for use in
* other situations such as parsing GUC variables. In the GUC case, it's
* important to avoid memory leaks, so the API is designed to minimize the
* amount of stuff that needs to be allocated and freed.
*
* Inputs:
* rawstring: the input string; must be overwritable! On return, it's
* been modified to contain the separated identifiers.
* separator: the separator punctuation expected between identifiers
* (typically '.' or ','). Whitespace may also appear around
* identifiers.
* Outputs:
* namelist: filled with a palloc'd list of pointers to identifiers within
* rawstring. Caller should freeList() this even on error return.
*
* Returns TRUE if okay, FALSE if there is a syntax error in the string.
*
* Note that an empty string is considered okay here, though not in
* textToQualifiedNameList.
*/
bool
SplitIdentifierString(char *rawstring, char separator,
List **namelist)
{
char *nextp = rawstring;
bool done = false;
*namelist = NIL;
while (isspace((unsigned char) *nextp))
nextp++; /* skip leading whitespace */
if (*nextp == '\0')
return true; /* allow empty string */
/* At the top of the loop, we are at start of a new identifier. */
do
{
char *curname;
char *endp;
if (*nextp == '\"')
{
/* Quoted name --- collapse quote-quote pairs, no downcasing */
curname = nextp + 1;
for (;;)
{
endp = strchr(nextp + 1, '\"');
if (endp == NULL)
return false; /* mismatched quotes */
if (endp[1] != '\"')
break; /* found end of quoted name */
/* Collapse adjacent quotes into one quote, and look again */
memmove(endp, endp + 1, strlen(endp));
nextp = endp;
}
/* endp now points at the terminating quote */
nextp = endp + 1;
}
else
{
/* Unquoted name --- extends to separator or whitespace */
char *downname;
int len;
curname = nextp;
while (*nextp && *nextp != separator &&
!isspace((unsigned char) *nextp))
nextp++;
endp = nextp;
if (curname == nextp)
return false; /* empty unquoted name not allowed */
/*
* Downcase the identifier, using same code as main lexer
* does.
*
* XXX because we want to overwrite the input in-place, we cannot
* support a downcasing transformation that increases the
* string length. This is not a problem given the current
* implementation of downcase_truncate_identifier, but we'll
* probably have to do something about this someday.
*/
len = endp - curname;
downname = downcase_truncate_identifier(curname, len, false);
Assert(strlen(downname) <= len);
strncpy(curname, downname, len);
pfree(downname);
}
while (isspace((unsigned char) *nextp))
nextp++; /* skip trailing whitespace */
if (*nextp == separator)
{
nextp++;
while (isspace((unsigned char) *nextp))
nextp++; /* skip leading whitespace for next */
/* we expect another name, so done remains false */
}
else if (*nextp == '\0')
done = true;
else
return false; /* invalid syntax */
/* Now safe to overwrite separator with a null */
*endp = '\0';
/* Truncate name if it's overlength */
truncate_identifier(curname, strlen(curname), false);
/*
* Finished isolating current name --- add it to list
*/
*namelist = lappend(*namelist, curname);
/* Loop back if we didn't reach end of string */
} while (!done);
return true;
}
/*****************************************************************************
* Comparison Functions used for bytea
*
* Note: btree indexes need these routines not to leak memory; therefore,
* be careful to free working copies of toasted datums. Most places don't
* need to be so careful.
*****************************************************************************/
Datum
byteaeq(PG_FUNCTION_ARGS)
{
bytea *arg1 = PG_GETARG_BYTEA_P(0);
bytea *arg2 = PG_GETARG_BYTEA_P(1);
int len1,
len2;
bool result;
len1 = VARSIZE(arg1) - VARHDRSZ;
len2 = VARSIZE(arg2) - VARHDRSZ;
/* fast path for different-length inputs */
if (len1 != len2)
result = false;
else
result = (memcmp(VARDATA(arg1), VARDATA(arg2), len1) == 0);
PG_FREE_IF_COPY(arg1, 0);
PG_FREE_IF_COPY(arg2, 1);
PG_RETURN_BOOL(result);
}
Datum
byteane(PG_FUNCTION_ARGS)
{
bytea *arg1 = PG_GETARG_BYTEA_P(0);
bytea *arg2 = PG_GETARG_BYTEA_P(1);
int len1,
len2;
bool result;
len1 = VARSIZE(arg1) - VARHDRSZ;
len2 = VARSIZE(arg2) - VARHDRSZ;
/* fast path for different-length inputs */
if (len1 != len2)
result = true;
else
result = (memcmp(VARDATA(arg1), VARDATA(arg2), len1) != 0);
PG_FREE_IF_COPY(arg1, 0);
PG_FREE_IF_COPY(arg2, 1);
PG_RETURN_BOOL(result);
}
Datum
bytealt(PG_FUNCTION_ARGS)
{
bytea *arg1 = PG_GETARG_BYTEA_P(0);
bytea *arg2 = PG_GETARG_BYTEA_P(1);
int len1,
len2;
int cmp;
len1 = VARSIZE(arg1) - VARHDRSZ;
len2 = VARSIZE(arg2) - VARHDRSZ;
cmp = memcmp(VARDATA(arg1), VARDATA(arg2), Min(len1, len2));
PG_FREE_IF_COPY(arg1, 0);
PG_FREE_IF_COPY(arg2, 1);
PG_RETURN_BOOL((cmp < 0) || ((cmp == 0) && (len1 < len2)));
}
Datum
byteale(PG_FUNCTION_ARGS)
{
bytea *arg1 = PG_GETARG_BYTEA_P(0);
bytea *arg2 = PG_GETARG_BYTEA_P(1);
int len1,
len2;
int cmp;
len1 = VARSIZE(arg1) - VARHDRSZ;
len2 = VARSIZE(arg2) - VARHDRSZ;
cmp = memcmp(VARDATA(arg1), VARDATA(arg2), Min(len1, len2));
PG_FREE_IF_COPY(arg1, 0);
PG_FREE_IF_COPY(arg2, 1);
PG_RETURN_BOOL((cmp < 0) || ((cmp == 0) && (len1 <= len2)));
}
Datum
byteagt(PG_FUNCTION_ARGS)
{
bytea *arg1 = PG_GETARG_BYTEA_P(0);
bytea *arg2 = PG_GETARG_BYTEA_P(1);
int len1,
len2;
int cmp;
len1 = VARSIZE(arg1) - VARHDRSZ;
len2 = VARSIZE(arg2) - VARHDRSZ;
cmp = memcmp(VARDATA(arg1), VARDATA(arg2), Min(len1, len2));
PG_FREE_IF_COPY(arg1, 0);
PG_FREE_IF_COPY(arg2, 1);
PG_RETURN_BOOL((cmp > 0) || ((cmp == 0) && (len1 > len2)));
}
Datum
byteage(PG_FUNCTION_ARGS)
{
bytea *arg1 = PG_GETARG_BYTEA_P(0);
bytea *arg2 = PG_GETARG_BYTEA_P(1);
int len1,
len2;
int cmp;
len1 = VARSIZE(arg1) - VARHDRSZ;
len2 = VARSIZE(arg2) - VARHDRSZ;
cmp = memcmp(VARDATA(arg1), VARDATA(arg2), Min(len1, len2));
PG_FREE_IF_COPY(arg1, 0);
PG_FREE_IF_COPY(arg2, 1);
PG_RETURN_BOOL((cmp > 0) || ((cmp == 0) && (len1 >= len2)));
}
Datum
byteacmp(PG_FUNCTION_ARGS)
{
bytea *arg1 = PG_GETARG_BYTEA_P(0);
bytea *arg2 = PG_GETARG_BYTEA_P(1);
int len1,
len2;
int cmp;
len1 = VARSIZE(arg1) - VARHDRSZ;
len2 = VARSIZE(arg2) - VARHDRSZ;
cmp = memcmp(VARDATA(arg1), VARDATA(arg2), Min(len1, len2));
if ((cmp == 0) && (len1 != len2))
cmp = (len1 < len2) ? -1 : 1;
PG_FREE_IF_COPY(arg1, 0);
PG_FREE_IF_COPY(arg2, 1);
PG_RETURN_INT32(cmp);
}
/*
* replace_text
* replace all occurrences of 'old_sub_str' in 'orig_str'
* with 'new_sub_str' to form 'new_str'
*
* returns 'orig_str' if 'old_sub_str' == '' or 'orig_str' == ''
* otherwise returns 'new_str'
*/
Datum
replace_text(PG_FUNCTION_ARGS)
{
text *src_text = PG_GETARG_TEXT_P(0);
text *from_sub_text = PG_GETARG_TEXT_P(1);
text *to_sub_text = PG_GETARG_TEXT_P(2);
int src_text_len = TEXTLEN(src_text);
int from_sub_text_len = TEXTLEN(from_sub_text);
char *to_sub_str = PG_TEXT_GET_STR(to_sub_text);
text *left_text;
text *right_text;
text *buf_text;
text *ret_text;
int curr_posn;
StringInfo str = makeStringInfo();
if (src_text_len == 0 || from_sub_text_len == 0)
PG_RETURN_TEXT_P(src_text);
buf_text = TEXTDUP(src_text);
curr_posn = TEXTPOS(buf_text, from_sub_text);
while (curr_posn > 0)
{
left_text = LEFT(buf_text, from_sub_text);
right_text = RIGHT(buf_text, from_sub_text, from_sub_text_len);
appendStringInfoString(str, PG_TEXT_GET_STR(left_text));
appendStringInfoString(str, to_sub_str);
pfree(buf_text);
pfree(left_text);
buf_text = right_text;
curr_posn = TEXTPOS(buf_text, from_sub_text);
}
appendStringInfoString(str, PG_TEXT_GET_STR(buf_text));
pfree(buf_text);
ret_text = PG_STR_GET_TEXT(str->data);
pfree(str->data);
pfree(str);
PG_RETURN_TEXT_P(ret_text);
}
/*
* split_text
* parse input string
* return ord item (1 based)
* based on provided field separator
*/
Datum
split_text(PG_FUNCTION_ARGS)
{
text *inputstring = PG_GETARG_TEXT_P(0);
text *fldsep = PG_GETARG_TEXT_P(1);
int fldnum = PG_GETARG_INT32(2);
int inputstring_len = TEXTLEN(inputstring);
int fldsep_len = TEXTLEN(fldsep);
int start_posn;
int end_posn;
text *result_text;
/* field number is 1 based */
if (fldnum < 1)
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("field position must be greater than zero")));
/* return empty string for empty input string */
if (inputstring_len < 1)
PG_RETURN_TEXT_P(PG_STR_GET_TEXT(""));
/* empty field separator */
if (fldsep_len < 1)
{
/* if first field, return input string, else empty string */
if (fldnum == 1)
PG_RETURN_TEXT_P(inputstring);
else
PG_RETURN_TEXT_P(PG_STR_GET_TEXT(""));
}
start_posn = text_position(inputstring, fldsep, fldnum - 1);
end_posn = text_position(inputstring, fldsep, fldnum);
if ((start_posn == 0) && (end_posn == 0)) /* fldsep not found */
{
/* if first field, return input string, else empty string */
if (fldnum == 1)
PG_RETURN_TEXT_P(inputstring);
else
PG_RETURN_TEXT_P(PG_STR_GET_TEXT(""));
}
else if (start_posn == 0)
{
/* first field requested */
result_text = LEFT(inputstring, fldsep);
PG_RETURN_TEXT_P(result_text);
}
else if (end_posn == 0)
{
/* last field requested */
result_text = text_substring(PointerGetDatum(inputstring),
start_posn + fldsep_len,
-1, true);
PG_RETURN_TEXT_P(result_text);
}
else
{
/* interior field requested */
result_text = text_substring(PointerGetDatum(inputstring),
start_posn + fldsep_len,
end_posn - start_posn - fldsep_len,
false);
PG_RETURN_TEXT_P(result_text);
}
}
/*
* text_to_array
* parse input string
* return text array of elements
* based on provided field separator
*/
Datum
text_to_array(PG_FUNCTION_ARGS)
{
text *inputstring = PG_GETARG_TEXT_P(0);
text *fldsep = PG_GETARG_TEXT_P(1);
int inputstring_len = TEXTLEN(inputstring);
int fldsep_len = TEXTLEN(fldsep);
int fldnum;
int start_posn;
int end_posn;
text *result_text;
ArrayBuildState *astate = NULL;
/* return NULL for empty input string */
if (inputstring_len < 1)
PG_RETURN_NULL();
/*
* empty field separator return one element, 1D, array using the input
* string
*/
if (fldsep_len < 1)
PG_RETURN_ARRAYTYPE_P(create_singleton_array(fcinfo, TEXTOID,
CStringGetDatum(inputstring), 1));
/* start with end position holding the initial start position */
end_posn = 0;
for (fldnum = 1;; fldnum++) /* field number is 1 based */
{
Datum dvalue;
bool disnull = false;
start_posn = end_posn;
end_posn = text_position(inputstring, fldsep, fldnum);
if ((start_posn == 0) && (end_posn == 0)) /* fldsep not found */
{
if (fldnum == 1)
{
/*
* first element return one element, 1D, array using the
* input string
*/
PG_RETURN_ARRAYTYPE_P(create_singleton_array(fcinfo, TEXTOID,
CStringGetDatum(inputstring), 1));
}
else
{
/* otherwise create array and exit */
PG_RETURN_ARRAYTYPE_P(makeArrayResult(astate,
CurrentMemoryContext));
}
}
else if (start_posn == 0)
{
/* first field requested */
result_text = LEFT(inputstring, fldsep);
}
else if (end_posn == 0)
{
/* last field requested */
result_text = text_substring(PointerGetDatum(inputstring),
start_posn + fldsep_len,
-1, true);
}
else
{
/* interior field requested */
result_text = text_substring(PointerGetDatum(inputstring),
start_posn + fldsep_len,
end_posn - start_posn - fldsep_len,
false);
}
/* stash away current value */
dvalue = PointerGetDatum(result_text);
astate = accumArrayResult(astate, dvalue,
disnull, TEXTOID,
CurrentMemoryContext);
}
/* never reached -- keep compiler quiet */
PG_RETURN_NULL();
}
/*
* array_to_text
* concatenate Cstring representation of input array elements
* using provided field separator
*/
Datum
array_to_text(PG_FUNCTION_ARGS)
{
ArrayType *v = PG_GETARG_ARRAYTYPE_P(0);
char *fldsep = PG_TEXTARG_GET_STR(1);
int nitems,
*dims,
ndims;
char *p;
Oid element_type;
int typlen;
bool typbyval;
char typalign;
StringInfo result_str = makeStringInfo();
int i;
ArrayMetaState *my_extra;
p = ARR_DATA_PTR(v);
ndims = ARR_NDIM(v);
dims = ARR_DIMS(v);
nitems = ArrayGetNItems(ndims, dims);
/* if there are no elements, return an empty string */
if (nitems == 0)
PG_RETURN_TEXT_P(PG_STR_GET_TEXT(""));
element_type = ARR_ELEMTYPE(v);
/*
* We arrange to look up info about element type, including its output
* conversion proc, only once per series of calls, assuming the
* element type doesn't change underneath us.
*/
my_extra = (ArrayMetaState *) fcinfo->flinfo->fn_extra;
if (my_extra == NULL)
{
fcinfo->flinfo->fn_extra = MemoryContextAlloc(fcinfo->flinfo->fn_mcxt,
sizeof(ArrayMetaState));
my_extra = (ArrayMetaState *) fcinfo->flinfo->fn_extra;
my_extra->element_type = InvalidOid;
}
if (my_extra->element_type != element_type)
{
/*
* Get info about element type, including its output conversion
* proc
*/
get_type_io_data(element_type, IOFunc_output,
&my_extra->typlen, &my_extra->typbyval,
&my_extra->typalign, &my_extra->typdelim,
&my_extra->typioparam, &my_extra->typiofunc);
fmgr_info_cxt(my_extra->typiofunc, &my_extra->proc,
fcinfo->flinfo->fn_mcxt);
my_extra->element_type = element_type;
}
typlen = my_extra->typlen;
typbyval = my_extra->typbyval;
typalign = my_extra->typalign;
for (i = 0; i < nitems; i++)
{
Datum itemvalue;
char *value;
itemvalue = fetch_att(p, typbyval, typlen);
value = DatumGetCString(FunctionCall1(&my_extra->proc,
itemvalue));
if (i > 0)
appendStringInfo(result_str, "%s%s", fldsep, value);
else
appendStringInfoString(result_str, value);
p = att_addlength(p, typlen, PointerGetDatum(p));
p = (char *) att_align(p, typalign);
}
PG_RETURN_TEXT_P(PG_STR_GET_TEXT(result_str->data));
}
#define HEXBASE 16
/*
* Convert a int32 to a string containing a base 16 (hex) representation of
* the number.
*/
Datum
to_hex32(PG_FUNCTION_ARGS)
{
uint32 value = (uint32) PG_GETARG_INT32(0);
text *result_text;
char *ptr;
const char *digits = "0123456789abcdef";
char buf[32]; /* bigger than needed, but reasonable */
ptr = buf + sizeof(buf) - 1;
*ptr = '\0';
do
{
*--ptr = digits[value % HEXBASE];
value /= HEXBASE;
} while (ptr > buf && value);
result_text = PG_STR_GET_TEXT(ptr);
PG_RETURN_TEXT_P(result_text);
}
/*
* Convert a int64 to a string containing a base 16 (hex) representation of
* the number.
*/
Datum
to_hex64(PG_FUNCTION_ARGS)
{
uint64 value = (uint64) PG_GETARG_INT64(0);
text *result_text;
char *ptr;
const char *digits = "0123456789abcdef";
char buf[32]; /* bigger than needed, but reasonable */
ptr = buf + sizeof(buf) - 1;
*ptr = '\0';
do
{
*--ptr = digits[value % HEXBASE];
value /= HEXBASE;
} while (ptr > buf && value);
result_text = PG_STR_GET_TEXT(ptr);
PG_RETURN_TEXT_P(result_text);
}
/*
* Create an md5 hash of a text string and return it as hex
*
* md5 produces a 16 byte (128 bit) hash; double it for hex
*/
#define MD5_HASH_LEN 32
Datum
md5_text(PG_FUNCTION_ARGS)
{
text *in_text = PG_GETARG_TEXT_P(0);
size_t len;
char hexsum[MD5_HASH_LEN + 1];
text *result_text;
/* Calculate the length of the buffer using varlena metadata */
len = VARSIZE(in_text) - VARHDRSZ;
/* get the hash result */
if (md5_hash(VARDATA(in_text), len, hexsum) == false)
ereport(ERROR,
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of memory")));
/* convert to text and return it */
result_text = PG_STR_GET_TEXT(hexsum);
PG_RETURN_TEXT_P(result_text);
}
/*
* Create an md5 hash of a bytea field and return it as a hex string:
* 16-byte md5 digest is represented in 32 hex characters.
*/
Datum
md5_bytea(PG_FUNCTION_ARGS)
{
bytea *in = PG_GETARG_BYTEA_P(0);
size_t len;
char hexsum[MD5_HASH_LEN + 1];
text *result_text;
len = VARSIZE(in) - VARHDRSZ;
if (md5_hash(VARDATA(in), len, hexsum) == false)
ereport(ERROR,
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of memory")));
result_text = PG_STR_GET_TEXT(hexsum);
PG_RETURN_TEXT_P(result_text);
}
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