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strings.c
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/*************************************
* Author: Pavel Stehule @2010
*
* if you like this sw, then send postcard from your home on address
*
* Pavel Stehule
* Skalice 12
* 256 01 Benesov u Prahy
* Czech Republic
*
* licenced under BSD licence
*/
#include "postgres.h"
#include "stdio.h"
#include "wchar.h"
#include "catalog/pg_type.h"
#include "lib/stringinfo.h"
#include "mb/pg_wchar.h"
#include "parser/parse_coerce.h"
#include "utils/builtins.h"
#include "utils/lsyscache.h"
#include "utils/memutils.h"
#include "utils/pg_locale.h"
#if PG_VERSION_NUM < 90000
#define appendStringInfoSpaces(str, n) appendStringInfo(str, "%*s", n, " ")
#endif
PG_MODULE_MAGIC;
#define CHECK_PAD(symbol, pad_value) \
do { \
if (pdesc->flags & pad_value) \
ereport(ERROR, \
(errcode(ERRCODE_INVALID_PARAMETER_VALUE), \
errmsg("broken sprintf format"), \
errdetail("Format string is '%s'.", TextDatumGetCString(fmt)), \
errhint("Symbol '%c' can be used only one time.", symbol))); \
pdesc->flags |= pad_value; \
} while(0);
/*
* string functions
*/
Datum pst_sprintf(PG_FUNCTION_ARGS);
Datum pst_sprintf_nv(PG_FUNCTION_ARGS);
Datum pst_format(PG_FUNCTION_ARGS);
Datum pst_format_nv(PG_FUNCTION_ARGS);
Datum pst_concat(PG_FUNCTION_ARGS);
Datum pst_concat_ws(PG_FUNCTION_ARGS);
Datum pst_concat_js(PG_FUNCTION_ARGS);
Datum pst_concat_sql(PG_FUNCTION_ARGS);
Datum pst_left(PG_FUNCTION_ARGS);
Datum pst_right(PG_FUNCTION_ARGS);
Datum pst_left(PG_FUNCTION_ARGS);
Datum pst_rvrs(PG_FUNCTION_ARGS);
Datum pst_chars_to_array(PG_FUNCTION_ARGS);
/*
* V1 registrations
*/
PG_FUNCTION_INFO_V1(pst_sprintf);
PG_FUNCTION_INFO_V1(pst_sprintf_nv);
PG_FUNCTION_INFO_V1(pst_format);
PG_FUNCTION_INFO_V1(pst_format_nv);
PG_FUNCTION_INFO_V1(pst_concat);
PG_FUNCTION_INFO_V1(pst_concat_ws);
PG_FUNCTION_INFO_V1(pst_concat_js);
PG_FUNCTION_INFO_V1(pst_concat_sql);
PG_FUNCTION_INFO_V1(pst_rvrs);
PG_FUNCTION_INFO_V1(pst_left);
PG_FUNCTION_INFO_V1(pst_right);
PG_FUNCTION_INFO_V1(pst_chars_to_array);
typedef enum {
stringfunc_ZERO = 1,
stringfunc_SPACE = 2,
stringfunc_PLUS = 4,
stringfunc_MINUS = 8,
stringfunc_STAR_WIDTH = 16,
stringfunc_SHARP = 32,
stringfunc_WIDTH = 64,
stringfunc_PRECISION = 128,
stringfunc_STAR_PRECISION = 256
} PlaceholderTags;
typedef struct {
int flags;
char field_type;
char lenmod;
int32 width;
int32 precision;
} FormatPlaceholderData;
typedef FormatPlaceholderData *PlaceholderDesc;
/*
* Static functions
*/
static char *json_string(char *str);
static int mb_string_info(text *str, char **sizes, int **positions);
static Datum
castValueTo(Datum value, Oid targetTypeId, Oid inputTypeId)
{
Oid funcId;
CoercionPathType pathtype;
FmgrInfo finfo;
Datum result;
if (inputTypeId != UNKNOWNOID)
pathtype = find_coercion_pathway(targetTypeId, inputTypeId,
COERCION_EXPLICIT,
&funcId);
else
pathtype = COERCION_PATH_COERCEVIAIO;
switch (pathtype)
{
case COERCION_PATH_RELABELTYPE:
result = value;
break;
case COERCION_PATH_FUNC:
{
Assert(OidIsValid(funcId));
fmgr_info(funcId, &finfo);
result = FunctionCall1(&finfo, value);
}
break;
case COERCION_PATH_COERCEVIAIO:
{
Oid typoutput;
Oid typinput;
bool typIsVarlena;
Oid typIOParam;
char *extval;
getTypeOutputInfo(inputTypeId, &typoutput, &typIsVarlena);
extval = OidOutputFunctionCall(typoutput, value);
getTypeInputInfo(targetTypeId, &typinput, &typIOParam);
result = OidInputFunctionCall(typinput, extval, typIOParam, -1);
}
break;
default:
elog(ERROR, "failed to find conversion function from %s to %s",
format_type_be(inputTypeId), format_type_be(targetTypeId));
/* be compiler quiet */
result = (Datum) 0;
}
return result;
}
/*
* parse and verify sprintf parameter
*
* %[flags][width][.precision]specifier
*
*/
static char *
parsePlaceholder(char *src, char *end_ptr, PlaceholderDesc pdesc, text *fmt)
{
char c;
pdesc->field_type = '\0';
pdesc->lenmod = '\0';
pdesc->flags = 0;
pdesc->width = 0;
pdesc->precision = 0;
while (src < end_ptr && pdesc->field_type == '\0')
{
c = *++src;
switch (c)
{
case '0':
CHECK_PAD('0', stringfunc_ZERO);
break;
case ' ':
CHECK_PAD(' ', stringfunc_SPACE);
break;
case '+':
CHECK_PAD('+', stringfunc_PLUS);
break;
case '-':
CHECK_PAD('-', stringfunc_MINUS);
break;
case '*':
CHECK_PAD('*', stringfunc_STAR_WIDTH);
break;
case '#':
CHECK_PAD('#', stringfunc_SHARP);
break;
case 'o': case 'i': case 'e': case 'E': case 'f':
case 'g': case 'd': case 's': case 'x': case 'X':
pdesc->field_type = *src;
break;
case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
CHECK_PAD('9', stringfunc_WIDTH);
pdesc->width = c - '0';
while (src < end_ptr && isdigit(src[1]))
pdesc->width = pdesc->width * 10 + *++src - '0';
break;
case '.':
if (src < end_ptr)
{
if (src[1] == '*')
{
CHECK_PAD('.', stringfunc_STAR_PRECISION);
src++;
}
else
{
/*
* when no one digit is entered, then precision
* is zero - digits are optional.
*/
CHECK_PAD('.', stringfunc_PRECISION);
while (src < end_ptr && isdigit(src[1]))
{
pdesc->precision = pdesc->precision * 10 + *++src - '0';
}
}
}
else
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("broken sprintf format"),
errdetail("missing precision value")));
break;
default:
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("unsupported sprintf format tag '%.*s'", pg_mblen(src), src)));
}
}
if (pdesc->field_type == '\0')
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("broken sprintf format")));
return src;
}
static char *
currentFormat(StringInfo str, PlaceholderDesc pdesc)
{
resetStringInfo(str);
appendStringInfoChar(str,'%');
if (pdesc->flags & stringfunc_ZERO)
appendStringInfoChar(str, '0');
if (pdesc->flags & stringfunc_MINUS)
appendStringInfoChar(str, '-');
if (pdesc->flags & stringfunc_PLUS)
appendStringInfoChar(str, '+');
if (pdesc->flags & stringfunc_SPACE)
appendStringInfoChar(str, ' ');
if (pdesc->flags & stringfunc_SHARP)
appendStringInfoChar(str, '#');
if ((pdesc->flags & stringfunc_WIDTH) || (pdesc->flags & stringfunc_STAR_WIDTH))
appendStringInfoChar(str, '*');
if ((pdesc->flags & stringfunc_PRECISION) || (pdesc->flags & stringfunc_STAR_PRECISION))
appendStringInfoString(str, ".*");
/* Append l or ll. Decision is based on value of INT64_FORMAT */
if (pdesc->lenmod == 'l')
{
if (strcmp(INT64_FORMAT, "%lld") == 0)
appendStringInfoString(str, "ll");
else
appendStringInfoString(str, "l");
}
else if (pdesc->lenmod != '\0')
appendStringInfoChar(str, pdesc->lenmod);
appendStringInfoChar(str, pdesc->field_type);
return str->data;
}
/*
* simulate %+width.precion%s format of sprintf function
*/
static void
append_string(StringInfo str, PlaceholderDesc pdesc, char *string)
{
int nchars = 0; /* length of substring in chars */
int binlen = 0; /* length of substring in bytes */
/*
* apply precision - it means "show only first n chars", for strings - this flag is
* ignored for proprietary tags %lq and iq, because we can't to show a first n chars
* from possible quoted value.
*/
if (pdesc->flags & stringfunc_PRECISION && pdesc->field_type != 'q')
{
char *ptr = string;
int len = pdesc->precision;
if (pg_database_encoding_max_length() > 1)
{
while (*ptr && len > 0)
{
ptr += pg_mblen(ptr);
len--;
nchars++;
}
}
else
{
while (*ptr && len > 0)
{
ptr++;
len--;
nchars++;
}
}
binlen = ptr - string;
}
else
{
/* there isn't precion specified, show complete string */
nchars = pg_mbstrlen(string);
binlen = strlen(string);
}
/* when width is specified, then we have to solve left or right align */
if (pdesc->flags & stringfunc_WIDTH)
{
if (pdesc->width > nchars)
{
/* add neccessary spaces to begin or end */
if (pdesc->flags & stringfunc_MINUS)
{
/* allign to left */
appendBinaryStringInfo(str, string, binlen);
appendStringInfoSpaces(str, pdesc->width - nchars);
}
else
{
/* allign to right */
appendStringInfoSpaces(str, pdesc->width - nchars);
appendBinaryStringInfo(str, string, binlen);
}
}
else
/* just copy result to output */
appendBinaryStringInfo(str, string, binlen);
}
else
/* just copy result to output */
appendBinaryStringInfo(str, string, binlen);
}
/*
* Set width and precision when they are defined dynamicaly
*/
static
int setWidthAndPrecision(PlaceholderDesc pdesc, FunctionCallInfoData *fcinfo, int current)
{
/*
* don't allow ambiguous definition
*/
if ((pdesc->flags & stringfunc_WIDTH) && (pdesc->flags & stringfunc_STAR_WIDTH))
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("broken sprintf format"),
errdetail("ambiguous width definition")));
if ((pdesc->flags & stringfunc_PRECISION) && (pdesc->flags & stringfunc_STAR_PRECISION))
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("broken sprintf format"),
errdetail("ambiguous precision definition")));
if (pdesc->flags & stringfunc_STAR_WIDTH)
{
if (current >= PG_NARGS())
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("too few parameters specified for printf function")));
if (PG_ARGISNULL(current))
ereport(ERROR,
(errcode(ERRCODE_NULL_VALUE_NOT_ALLOWED),
errmsg("null value not allowed"),
errhint("width (%dth) arguments is NULL", current)));
pdesc->width = DatumGetInt32(castValueTo(PG_GETARG_DATUM(current), INT4OID,
get_fn_expr_argtype(fcinfo->flinfo, current)));
/* reset flag */
pdesc->flags ^= stringfunc_STAR_WIDTH;
pdesc->flags |= stringfunc_WIDTH;
current += 1;
}
if (pdesc->flags & stringfunc_STAR_PRECISION)
{
if (current >= PG_NARGS())
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("too few parameters specified for printf function")));
if (PG_ARGISNULL(current))
ereport(ERROR,
(errcode(ERRCODE_NULL_VALUE_NOT_ALLOWED),
errmsg("null value not allowed"),
errhint("width (%dth) arguments is NULL", current)));
pdesc->precision = DatumGetInt32(castValueTo(PG_GETARG_DATUM(current), INT4OID,
get_fn_expr_argtype(fcinfo->flinfo, current)));
/* reset flags */
pdesc->flags ^= stringfunc_STAR_PRECISION;
pdesc->flags |= stringfunc_PRECISION;
current += 1;
}
return current;
}
/*
* sprintf function - it is wrapper for libc vprintf function
*
* ensure PostgreSQL -> C casting
*/
Datum
pst_sprintf(PG_FUNCTION_ARGS)
{
text *fmt;
StringInfoData str;
StringInfoData format_str;
char *cp;
int i = 1;
size_t len;
char *start_ptr,
*end_ptr;
FormatPlaceholderData pdesc;
text *result;
Oid typoutput;
bool typIsVarlena;
Datum value;
Oid valtype;
/* When format string is null, returns null */
if (PG_ARGISNULL(0))
PG_RETURN_NULL();
fmt = PG_GETARG_TEXT_PP(0);
len = VARSIZE_ANY_EXHDR(fmt);
start_ptr = VARDATA_ANY(fmt);
end_ptr = start_ptr + len - 1;
initStringInfo(&str);
initStringInfo(&format_str);
for (cp = start_ptr; cp <= end_ptr; cp++)
{
if (cp[0] == '%')
{
/* when cp is not pointer on last char, check %% */
if (cp < end_ptr && cp[1] == '%')
{
appendStringInfoChar(&str, cp[1]);
cp++;
continue;
}
cp = parsePlaceholder(cp, end_ptr, &pdesc, fmt);
i = setWidthAndPrecision(&pdesc, fcinfo, i);
if (i >= PG_NARGS())
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("too few parameters specified for printf function")));
if (!PG_ARGISNULL(i))
{
/* append n-th value */
value = PG_GETARG_DATUM(i);
valtype = get_fn_expr_argtype(fcinfo->flinfo, i);
/* convert value to target type */
switch (pdesc.field_type)
{
case 'o': case 'd': case 'i': case 'x': case 'X':
{
int64 target_value;
const char *format;
pdesc.lenmod = 'l';
target_value = DatumGetInt64(castValueTo(value, INT8OID, valtype));
format = currentFormat(&format_str, &pdesc);
if ((pdesc.flags & stringfunc_WIDTH) && (pdesc.flags & stringfunc_PRECISION))
appendStringInfo(&str, format, pdesc.width, pdesc.precision, target_value);
else if (pdesc.flags & stringfunc_WIDTH)
appendStringInfo(&str, format, pdesc.width, target_value);
else if (pdesc.flags & stringfunc_PRECISION)
appendStringInfo(&str, format, pdesc.precision, target_value);
else
appendStringInfo(&str, format, target_value);
}
break;
case 'e': case 'f': case 'g': case 'G': case 'E':
{
float8 target_value;
const char *format;
target_value = DatumGetFloat8(castValueTo(value, FLOAT8OID, valtype));
format = currentFormat(&format_str, &pdesc);
if ((pdesc.flags & stringfunc_WIDTH) && (pdesc.flags & stringfunc_PRECISION))
appendStringInfo(&str, format, pdesc.width, pdesc.precision, target_value);
else if (pdesc.flags & stringfunc_WIDTH)
appendStringInfo(&str, format, pdesc.width, target_value);
else if (pdesc.flags & stringfunc_PRECISION)
appendStringInfo(&str, format, pdesc.precision, target_value);
else
appendStringInfo(&str, format, target_value);
}
break;
case 's':
{
char *target_value;
getTypeOutputInfo(valtype, &typoutput, &typIsVarlena);
target_value = OidOutputFunctionCall(typoutput, value);
append_string(&str, &pdesc, target_value);
pfree(target_value);
}
break;
default:
/* don't be happen - formats are checked in parsing stage */
elog(ERROR, "unknown format: %c", pdesc.field_type);
}
}
else
/* append a NULL string */
append_string(&str, &pdesc, "<NULL>");
i++;
}
else
appendStringInfoChar(&str, cp[0]);
}
/* check if all arguments are used */
if (i != PG_NARGS())
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("too many parameters for printf function")));
result = cstring_to_text_with_len(str.data, str.len);
pfree(str.data);
pfree(format_str.data);
PG_RETURN_TEXT_P(result);
}
/*
* only wrapper
*/
Datum
pst_sprintf_nv(PG_FUNCTION_ARGS)
{
return pst_sprintf(fcinfo);
}
typedef struct {
char field_type;
int32 position;
bool is_positional;
} placeholder_desc;
#define INVALID_PARAMETER_ERROR(d) ereport(ERROR, \
(errcode(ERRCODE_INVALID_PARAMETER_VALUE), \
errmsg("invalid formatting string for function format"), \
errdetail(d)))
static const char *
parse_format(placeholder_desc *pd, const char *start_ptr,
const char *end_ptr, int nparams)
{
bool is_valid = false;
pd->is_positional = false;
while (start_ptr <= end_ptr)
{
switch (*start_ptr)
{
case 's':
pd->field_type = 's';
is_valid = true;
break;
case 'I':
pd->field_type = 'I';
is_valid = true;
break;
case 'L':
pd->field_type = 'L';
is_valid = true;
break;
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
if (pd->is_positional)
INVALID_PARAMETER_ERROR("positional parameter is defined already");
pd->position = *start_ptr - '0';
while (start_ptr < end_ptr && isdigit(start_ptr[1]))
{
pd->position = pd->position * 10 + *++start_ptr - '0';
/* don't allow to integer overflow */
if (pd->position >= nparams)
INVALID_PARAMETER_ERROR("placeholder is out of range");
}
/* recheck position, or first check for one digit positions */
if (pd->position >= nparams)
INVALID_PARAMETER_ERROR("placeholder is out of range");
/* next character must be a $ */
if (start_ptr == end_ptr && isdigit(*start_ptr))
INVALID_PARAMETER_ERROR("unexpected end, missing '$'");
if (*++start_ptr != '$')
INVALID_PARAMETER_ERROR("expected '$'");
start_ptr++;
pd->is_positional = true;
break;
default:
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("invalid formatting string for function format"),
errdetail("unsupported tag \"%%%.*s\"", pg_mblen(start_ptr), start_ptr)));
}
if (is_valid)
break;
}
if (!is_valid)
INVALID_PARAMETER_ERROR("missing field type");
return start_ptr;
}
/*
* Returns a formated string
*/
Datum
pst_format(PG_FUNCTION_ARGS)
{
text *fmt;
StringInfoData str;
const char *cp;
int i = 1;
size_t len;
const char *start_ptr;
const char *end_ptr;
text *result;
/* When format string is null, returns null */
if (PG_ARGISNULL(0))
PG_RETURN_NULL();
fmt = PG_GETARG_TEXT_PP(0);
len = VARSIZE_ANY_EXHDR(fmt);
start_ptr = VARDATA_ANY(fmt);
end_ptr = start_ptr + len - 1;
initStringInfo(&str);
for (cp = start_ptr; cp <= end_ptr; cp++)
{
if (cp[0] == '%')
{
placeholder_desc pd = { ' ', 0, false }; /* be compiler quiet */
Oid valtype;
Datum value;
bool isNull;
int arg_num;
Oid typoutput;
bool typIsVarlena;
/* initial check */
if (cp == end_ptr)
INVALID_PARAMETER_ERROR("missing field type");
/* replace escaped symbol */
if (cp[1] == '%')
{
appendStringInfoChar(&str, '%');
cp++;
continue;
}
cp = parse_format(&pd, ++cp, end_ptr, PG_NARGS());
if (pd.is_positional)
{
arg_num = pd.position;
}
else
{
/* ordered arguments are not checked yet */
if (i >= PG_NARGS())
INVALID_PARAMETER_ERROR("too few parameters");
arg_num = i++;
}
value = PG_GETARG_DATUM(arg_num);
isNull = PG_ARGISNULL(arg_num);
valtype = get_fn_expr_argtype(fcinfo->flinfo, arg_num);
getTypeOutputInfo(valtype, &typoutput, &typIsVarlena);
switch (pd.field_type)
{
case 's':
{
if (!isNull)
{
char *outstr = OidOutputFunctionCall(typoutput, value);
appendStringInfoString(&str, outstr);
pfree(outstr);
}
break;
}
case 'I':
{
char *target_value;
if (isNull)
ereport(ERROR,
(errcode(ERRCODE_NULL_VALUE_NOT_ALLOWED),
errmsg("SQL identifier is undefined"),
errhint("You try to use NULL for %%I format")));
/* show it as sql identifier */
target_value = OidOutputFunctionCall(typoutput, value);
appendStringInfoString(&str, quote_identifier(target_value));
pfree(target_value);
break;
}
case 'L':
{
text *txt;
text *quoted_txt;
if (!isNull)
{
/* get text value and quotize */
txt = cstring_to_text(OidOutputFunctionCall(typoutput, value));
quoted_txt = DatumGetTextP(DirectFunctionCall1(quote_literal,
PointerGetDatum(txt)));
appendStringInfoString(&str, text_to_cstring(quoted_txt));
pfree(quoted_txt);
pfree(txt);
}
else
appendStringInfoString(&str, "NULL");
break;
}
default:
/* not possible */
elog(ERROR, "unexpected field type");
}
}
else
appendStringInfoChar(&str, cp[0]);
}
result = cstring_to_text_with_len(str.data, str.len);
pfree(str.data);
PG_RETURN_TEXT_P(result);
}
/*
* pst_format_nv - nonvariadic wrapper for text_format function.
*
* note: this wrapper is necessary to be sanity_checks test ok
*/
Datum
pst_format_nv(PG_FUNCTION_ARGS)
{
return pst_format(fcinfo);
}
/*
* Concat values to comma separated list. This function
* is NULL safe. NULL values are skipped.
*/
Datum
pst_concat(PG_FUNCTION_ARGS)
{
StringInfo str;
int i;
/* return NULL, if there are not any parameter */
if (PG_NARGS() == 0)
PG_RETURN_NULL();
str = makeStringInfo();
for(i = 0; i < PG_NARGS(); i++)
{
if (i > 0)
appendStringInfoChar(str, ',');
if (!PG_ARGISNULL(i))
{
Oid valtype;
Datum value;
Oid typoutput;
bool typIsVarlena;
/* append n-th value */
value = PG_GETARG_DATUM(i);
valtype = get_fn_expr_argtype(fcinfo->flinfo, i);
getTypeOutputInfo(valtype, &typoutput, &typIsVarlena);
appendStringInfoString(str, OidOutputFunctionCall(typoutput, value));
}
}
PG_RETURN_TEXT_P(CStringGetTextDatum(str->data));
}
/*
* Concat values to comma separated list. This function
* is NULL safe. NULL values are skipped.
*/
Datum
pst_concat_ws(PG_FUNCTION_ARGS)
{
StringInfo str;
int i;
char *sepstr;
if (PG_ARGISNULL(0))
PG_RETURN_NULL();
/* return NULL, if there are not any parameter */
if (PG_NARGS() == 1)
PG_RETURN_NULL();
sepstr = TextDatumGetCString(PG_GETARG_TEXT_P(0));
str = makeStringInfo();
for(i = 1; i < PG_NARGS(); i++)
{
if (i > 1)
appendStringInfoString(str, sepstr);
if (!PG_ARGISNULL(i))
{
Oid valtype;
Datum value;
Oid typoutput;
bool typIsVarlena;
/* append n-th value */
value = PG_GETARG_DATUM(i);
valtype = get_fn_expr_argtype(fcinfo->flinfo, i);
getTypeOutputInfo(valtype, &typoutput, &typIsVarlena);
appendStringInfoString(str, OidOutputFunctionCall(typoutput, value));
}
}
PG_RETURN_TEXT_P(CStringGetTextDatum(str->data));
}
/*
* Concat string with respect to SQL format. This is NULL safe.
* NULLs values are transformated to "NULL" string.
*/
Datum
pst_concat_sql(PG_FUNCTION_ARGS)
{
StringInfo str;
int i;
/* return NULL, if there are not any parameter */
if (PG_NARGS() == 0)
PG_RETURN_NULL();
str = makeStringInfo();
for(i = 0; i < PG_NARGS(); i++)
{
if (i > 0)
appendStringInfoChar(str, ',');
if (!PG_ARGISNULL(i))
{
Oid valtype;
Datum value;
Oid typoutput;
bool typIsVarlena;
TYPCATEGORY typcat;
/* append n-th value */
value = PG_GETARG_DATUM(i);
valtype = get_fn_expr_argtype(fcinfo->flinfo, i);
typcat = TypeCategory(valtype);
if (typcat == 'N' || typcat == 'B')
{
getTypeOutputInfo(valtype, &typoutput, &typIsVarlena);
appendStringInfoString(str, OidOutputFunctionCall(typoutput, value));
}
else
{
text *txt;
text *quoted_txt;
getTypeOutputInfo(valtype, &typoutput, &typIsVarlena);
/* get text value and quotize */
txt = cstring_to_text(OidOutputFunctionCall(typoutput, value));
quoted_txt = DatumGetTextP(DirectFunctionCall1(quote_literal,
PointerGetDatum(txt)));
appendStringInfoString(str, text_to_cstring(quoted_txt));
}
}
else
appendStringInfoString(str, "NULL");
}
PG_RETURN_TEXT_P(CStringGetTextDatum(str->data));
}
/*
* Concat string with respect to JSON format. This is NULL safe.
* NULLs values are transformated to "null" string.
* JSON uses lowercase characters for constants - see www.json.org
*/
Datum
pst_concat_js(PG_FUNCTION_ARGS)
{
StringInfo str;
int i;
/* return NULL, if there are not any parameter */
if (PG_NARGS() == 0)
PG_RETURN_NULL();
str = makeStringInfo();
for(i = 0; i < PG_NARGS(); i++)
{
if (i > 0)
appendStringInfoChar(str, ',');
if (!PG_ARGISNULL(i))
{
Oid valtype;
Datum value;
Oid typoutput;
bool typIsVarlena;
TYPCATEGORY typcat;
/* append n-th value */
value = PG_GETARG_DATUM(i);
valtype = get_fn_expr_argtype(fcinfo->flinfo, i);
typcat = TypeCategory(valtype);
if (typcat == 'N')