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/*-------------------------------------------------------------------------
*
* util.h
* General purpose routines used by JSON data type support.
*
* Copyright (c) 2010, PostgreSQL Global Development Group
* Written by Joey Adams <joeyadams3.14159@gmail.com>.
*
*-------------------------------------------------------------------------
*/
#ifndef JSON_UTIL_H
#define JSON_UTIL_H
#include "postgres.h"
#include "funcapi.h"
#include "utils/lsyscache.h"
/* TODO: Make this less "magic" (e.g. make it a function instead of a macro). */
#define FN_EXTRA(var, ...) FN_EXTRA_SZ(var, sizeof(*(var)), __VA_ARGS__)
#define FN_EXTRA_SZ(var, alloc, ...) do \
{ \
var = fcinfo->flinfo->fn_extra; \
if (var == NULL) \
{ \
var = fcinfo->flinfo->fn_extra = \
MemoryContextAlloc(fcinfo->flinfo->fn_mcxt, alloc); \
__VA_ARGS__; \
} \
} while(0)
typedef struct
{
Oid type;
IOFuncSelector which_func;
MemoryContext mcxt;
bool not_set;
int16 typlen;
bool typbyval;
char typalign;
char typdelim;
Oid typioparam;
Oid typiofunc;
FmgrInfo proc;
char typcategory;
bool typispreferred;
} TypeInfo;
void initTypeInfo(TypeInfo *d, MemoryContext mcxt);
void getTypeInfo(TypeInfo *d, Oid type, IOFuncSelector which_func);
Oid enumLabelToOid(const char *typname, const char *label);
size_t utf8_substring(const char *src, size_t srcbytes,
size_t start, size_t length,
const char **out_start, size_t *out_bytes);
void utf8_decode_char_nocheck(const char **sp, unsigned int *uc);
bool utf8_validate(const char *str, size_t length);
int utf8_encode_char(char *out, unsigned int uc);
/*
* Adaptations of pg_do_encoding_conversion for simplifying UTF-8 conversions.
*
* These are used frequently in the JSON code because JSON nodes are encoded
* in UTF-8. The reason they are encoded in UTF-8 is because we need to
* be able to handle Unicode escapes, and there's
* no simple and efficient way to do that with the server encoding.
*
* Just like pg_do_encoding_conversion, if no conversion is done, the original
* pointer given is returned.
*/
char *server_to_utf8(const char *str, int len);
char *utf8_to_server(const char *str, int len);
/*
* Adaptations of text_to_cstring and cstring_to_text for simplifying UTF-8 conversions.
*
* Just like text_to_cstring, text_to_utf8_cstring will always return a palloc'd,
* null-terminated C-string.
*/
char *text_to_utf8_cstring(const text *t);
text *utf8_cstring_to_text(const char *s);
text *utf8_cstring_to_text_with_len(const char *s, int len);
#endif
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