json.h File Reference

#include "lib/stringinfo.h"

Include dependency graph for json.h:

This graph shows which files directly or indirectly include this file:

Go to the source code of this file.

Functions
void	escape_json (StringInfo buf, const char *str)
char *	JsonEncodeDateTime (char *buf, Datum value, Oid typid, const int *tzp)

Function Documentation

escape_json()

void escape_json	(	StringInfo	buf,
		const char *	str
	)

Definition at line 1279 of file json.c.

References appendStringInfo(), appendStringInfoCharMacro, and appendStringInfoString().

Referenced by composite_to_json(), datum_to_json(), escape_yaml(), ExplainDummyGroup(), ExplainOpenGroup(), ExplainProperty(), ExplainPropertyList(), ExplainPropertyListNested(), hstore_to_json(), hstore_to_json_loose(), json_object(), json_object_two_arg(), jsonb_put_escaped_value(), populate_scalar(), printJsonPathItem(), sn_object_field_start(), sn_scalar(), transform_string_values_object_field_start(), and transform_string_values_scalar().

{
    const char *p;

    appendStringInfoCharMacro(buf, '"');
    for (p = str; *p; p++)
    {
        switch (*p)
        {
            case '\b':
                appendStringInfoString(buf, "\\b");
                break;
            case '\f':
                appendStringInfoString(buf, "\\f");
                break;
            case '\n':
                appendStringInfoString(buf, "\\n");
                break;
            case '\r':
                appendStringInfoString(buf, "\\r");
                break;
            case '\t':
                appendStringInfoString(buf, "\\t");
                break;
            case '"':
                appendStringInfoString(buf, "\\\"");
                break;
            case '\\':
                appendStringInfoString(buf, "\\\\");
                break;
            default:
                if ((unsigned char) *p < ' ')
                    appendStringInfo(buf, "\\u%04x", (int) *p);
                else
                    appendStringInfoCharMacro(buf, *p);
                break;
        }
    }
    appendStringInfoCharMacro(buf, '"');
}

JsonEncodeDateTime()

char* JsonEncodeDateTime	(	char *	buf,
		Datum	value,
		Oid	typid,
		const int *	tzp
	)

Definition at line 353 of file json.c.

References buf, DATE_NOT_FINITE, DatumGetDateADT, DatumGetTimeADT, DatumGetTimestamp, DatumGetTimestampTz, DatumGetTimeTzADTP, elog, EncodeDateOnly(), EncodeDateTime(), EncodeSpecialDate(), EncodeSpecialTimestamp(), EncodeTimeOnly(), ereport, errcode(), errmsg(), ERROR, j2date(), MAXDATELEN, palloc(), POSTGRES_EPOCH_JDATE, time2tm(), timestamp2tm(), TIMESTAMP_NOT_FINITE, timetz2tm(), tm, pg_tm::tm_isdst, pg_tm::tm_mday, pg_tm::tm_mon, pg_tm::tm_year, USE_XSD_DATES, and USECS_PER_SEC.

Referenced by convertJsonbScalar(), datum_to_json(), and datum_to_jsonb().

{
    if (!buf)
        buf = palloc(MAXDATELEN + 1);

    switch (typid)
    {
        case DATEOID:
            {
                DateADT     date;
                struct pg_tm tm;

                date = DatumGetDateADT(value);

                /* Same as date_out(), but forcing DateStyle */
                if (DATE_NOT_FINITE(date))
                    EncodeSpecialDate(date, buf);
                else
                {
                    j2date(date + POSTGRES_EPOCH_JDATE,
                           &(tm.tm_year), &(tm.tm_mon), &(tm.tm_mday));
                    EncodeDateOnly(&tm, USE_XSD_DATES, buf);
                }
            }
            break;
        case TIMEOID:
            {
                TimeADT     time = DatumGetTimeADT(value);
                struct pg_tm tt,
                           *tm = &tt;
                fsec_t      fsec;

                /* Same as time_out(), but forcing DateStyle */
                time2tm(time, tm, &fsec);
                EncodeTimeOnly(tm, fsec, false, 0, USE_XSD_DATES, buf);
            }
            break;
        case TIMETZOID:
            {
                TimeTzADT  *time = DatumGetTimeTzADTP(value);
                struct pg_tm tt,
                           *tm = &tt;
                fsec_t      fsec;
                int         tz;

                /* Same as timetz_out(), but forcing DateStyle */
                timetz2tm(time, tm, &fsec, &tz);
                EncodeTimeOnly(tm, fsec, true, tz, USE_XSD_DATES, buf);
            }
            break;
        case TIMESTAMPOID:
            {
                Timestamp   timestamp;
                struct pg_tm tm;
                fsec_t      fsec;

                timestamp = DatumGetTimestamp(value);
                /* Same as timestamp_out(), but forcing DateStyle */
                if (TIMESTAMP_NOT_FINITE(timestamp))
                    EncodeSpecialTimestamp(timestamp, buf);
                else if (timestamp2tm(timestamp, NULL, &tm, &fsec, NULL, NULL) == 0)
                    EncodeDateTime(&tm, fsec, false, 0, NULL, USE_XSD_DATES, buf);
                else
                    ereport(ERROR,
                            (errcode(ERRCODE_DATETIME_VALUE_OUT_OF_RANGE),
                             errmsg("timestamp out of range")));
            }
            break;
        case TIMESTAMPTZOID:
            {
                TimestampTz timestamp;
                struct pg_tm tm;
                int         tz;
                fsec_t      fsec;
                const char *tzn = NULL;

                timestamp = DatumGetTimestampTz(value);

                /*
                 * If a time zone is specified, we apply the time-zone shift,
                 * convert timestamptz to pg_tm as if it were without a time
                 * zone, and then use the specified time zone for converting
                 * the timestamp into a string.
                 */
                if (tzp)
                {
                    tz = *tzp;
                    timestamp -= (TimestampTz) tz * USECS_PER_SEC;
                }

                /* Same as timestamptz_out(), but forcing DateStyle */
                if (TIMESTAMP_NOT_FINITE(timestamp))
                    EncodeSpecialTimestamp(timestamp, buf);
                else if (timestamp2tm(timestamp, tzp ? NULL : &tz, &tm, &fsec,
                                      tzp ? NULL : &tzn, NULL) == 0)
                {
                    if (tzp)
                        tm.tm_isdst = 1;    /* set time-zone presence flag */

                    EncodeDateTime(&tm, fsec, true, tz, tzn, USE_XSD_DATES, buf);
                }
                else
                    ereport(ERROR,
                            (errcode(ERRCODE_DATETIME_VALUE_OUT_OF_RANGE),
                             errmsg("timestamp out of range")));
            }
            break;
        default:
            elog(ERROR, "unknown jsonb value datetime type oid %d", typid);
            return NULL;
    }

    return buf;
}