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17a5871d9d
There were quite a few places where we either had a non-NUL-terminated string or a text Datum which we needed to call escape_json() on. Many of these places required that a temporary string was created due to the fact that escape_json() needs a NUL-terminated cstring. For text types, those first had to be converted to cstring before calling escape_json() on them. Here we introduce two new functions to make escaping JSON more optimal: escape_json_text() can be given a text Datum to append onto the given buffer. This is more optimal as it foregoes the need to convert the text Datum into a cstring. A temporary allocation is only required if the text Datum needs to be detoasted. escape_json_with_len() can be used when the length of the cstring is already known or the given string isn't NUL-terminated. Having this allows various places which were creating a temporary NUL-terminated string to just call escape_json_with_len() without any temporary memory allocations. Discussion: https://postgr.es/m/CAApHDvpLXwMZvbCKcdGfU9XQjGCDm7tFpRdTXuB9PVgpNUYfEQ@mail.gmail.com Reviewed-by: Melih Mutlu, Heikki Linnakangas
34 lines
1.2 KiB
C
34 lines
1.2 KiB
C
/*-------------------------------------------------------------------------
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*
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* json.h
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* Declarations for JSON data type support.
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*
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* Portions Copyright (c) 1996-2024, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* src/include/utils/json.h
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef JSON_H
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#define JSON_H
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#include "lib/stringinfo.h"
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/* functions in json.c */
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extern void escape_json(StringInfo buf, const char *str);
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extern void escape_json_with_len(StringInfo buf, const char *str, int len);
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extern void escape_json_text(StringInfo buf, const text *txt);
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extern char *JsonEncodeDateTime(char *buf, Datum value, Oid typid,
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const int *tzp);
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extern bool to_json_is_immutable(Oid typoid);
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extern Datum json_build_object_worker(int nargs, const Datum *args, const bool *nulls,
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const Oid *types, bool absent_on_null,
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bool unique_keys);
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extern Datum json_build_array_worker(int nargs, const Datum *args, const bool *nulls,
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const Oid *types, bool absent_on_null);
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extern bool json_validate(text *json, bool check_unique_keys, bool throw_error);
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#endif /* JSON_H */
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