funcs.c File Reference

#include "postgres.h"
#include "executor/executor.h"
#include "utils/geo_decls.h"

Include dependency graph for funcs.c:

Go to the source code of this file.

Functions
	PG_FUNCTION_INFO_V1 (add_one)
Datum	add_one (PG_FUNCTION_ARGS)
	PG_FUNCTION_INFO_V1 (add_one_float8)
Datum	add_one_float8 (PG_FUNCTION_ARGS)
	PG_FUNCTION_INFO_V1 (makepoint)
Datum	makepoint (PG_FUNCTION_ARGS)
	PG_FUNCTION_INFO_V1 (copytext)
Datum	copytext (PG_FUNCTION_ARGS)
	PG_FUNCTION_INFO_V1 (concat_text)
Datum	concat_text (PG_FUNCTION_ARGS)
	PG_FUNCTION_INFO_V1 (c_overpaid)
Datum	c_overpaid (PG_FUNCTION_ARGS)

Variables
	PG_MODULE_MAGIC

Function Documentation

add_one()

Datum add_one

(

PG_FUNCTION_ARGS

)

Definition at line 24 of file funcs.c.

{
    int32       arg = PG_GETARG_INT32(0);
 
    PG_RETURN_INT32(arg + 1);
}

References arg, PG_GETARG_INT32, and PG_RETURN_INT32.

add_one_float8()

Datum add_one_float8

(

PG_FUNCTION_ARGS

)

Definition at line 36 of file funcs.c.

{
    /* The macros for FLOAT8 hide its pass-by-reference nature */
    float8      arg = PG_GETARG_FLOAT8(0);
 
    PG_RETURN_FLOAT8(arg + 1.0);
}

References arg, PG_GETARG_FLOAT8, and PG_RETURN_FLOAT8.

c_overpaid()

Datum c_overpaid

(

PG_FUNCTION_ARGS

)

Definition at line 110 of file funcs.c.

{
    HeapTupleHeader t = PG_GETARG_HEAPTUPLEHEADER(0);
    int32       limit = PG_GETARG_INT32(1);
    bool        isnull;
    int32       salary;
 
    salary = DatumGetInt32(GetAttributeByName(t, "salary", &isnull));
    if (isnull)
        PG_RETURN_BOOL(false);
 
    /*
     * Alternatively, we might prefer to do PG_RETURN_NULL() for null salary
     */
 
    PG_RETURN_BOOL(salary > limit);
}

References DatumGetInt32(), GetAttributeByName(), PG_GETARG_HEAPTUPLEHEADER, PG_GETARG_INT32, and PG_RETURN_BOOL.

concat_text()

Datum concat_text

(

PG_FUNCTION_ARGS

)

Definition at line 90 of file funcs.c.

{
    text       *arg1 = PG_GETARG_TEXT_PP(0);
    text       *arg2 = PG_GETARG_TEXT_PP(1);
    int32       arg1_size = VARSIZE_ANY_EXHDR(arg1);
    int32       arg2_size = VARSIZE_ANY_EXHDR(arg2);
    int32       new_text_size = arg1_size + arg2_size + VARHDRSZ;
    text       *new_text = (text *) palloc(new_text_size);
 
    SET_VARSIZE(new_text, new_text_size);
    memcpy(VARDATA(new_text), VARDATA_ANY(arg1), arg1_size);
    memcpy(VARDATA(new_text) + arg1_size, VARDATA_ANY(arg2), arg2_size);
    PG_RETURN_TEXT_P(new_text);
}

References palloc(), PG_GETARG_TEXT_PP, PG_RETURN_TEXT_P, SET_VARSIZE, VARDATA, VARDATA_ANY, VARHDRSZ, and VARSIZE_ANY_EXHDR.

copytext()

Datum copytext

(

PG_FUNCTION_ARGS

)

Definition at line 64 of file funcs.c.

{
    text       *t = PG_GETARG_TEXT_PP(0);
 
    /*
     * VARSIZE_ANY_EXHDR is the size of the struct in bytes, minus the
     * VARHDRSZ or VARHDRSZ_SHORT of its header.  Construct the copy with a
     * full-length header.
     */
    text       *new_t = (text *) palloc(VARSIZE_ANY_EXHDR(t) + VARHDRSZ);
 
    SET_VARSIZE(new_t, VARSIZE_ANY_EXHDR(t) + VARHDRSZ);
 
    /*
     * VARDATA is a pointer to the data region of the new struct.  The source
     * could be a short datum, so retrieve its data through VARDATA_ANY.
     */
    memcpy(VARDATA(new_t),      /* destination */
           VARDATA_ANY(t),      /* source */
           VARSIZE_ANY_EXHDR(t));   /* how many bytes */
    PG_RETURN_TEXT_P(new_t);
}

References palloc(), PG_GETARG_TEXT_PP, PG_RETURN_TEXT_P, SET_VARSIZE, VARDATA, VARDATA_ANY, VARHDRSZ, and VARSIZE_ANY_EXHDR.

makepoint()

Datum makepoint

(

PG_FUNCTION_ARGS

)

Definition at line 47 of file funcs.c.

{
    Point      *pointx = PG_GETARG_POINT_P(0);
    Point      *pointy = PG_GETARG_POINT_P(1);
    Point      *new_point = (Point *) palloc(sizeof(Point));
 
    new_point->x = pointx->x;
    new_point->y = pointy->y;
 
    PG_RETURN_POINT_P(new_point);
}

References palloc(), PG_GETARG_POINT_P, PG_RETURN_POINT_P, Point::x, and Point::y.

PG_FUNCTION_INFO_V1() [1/6]

PG_FUNCTION_INFO_V1

(

add_one

)

PG_FUNCTION_INFO_V1() [2/6]

PG_FUNCTION_INFO_V1

(

add_one_float8

)

PG_FUNCTION_INFO_V1() [3/6]

PG_FUNCTION_INFO_V1

(

c_overpaid

)

PG_FUNCTION_INFO_V1() [4/6]

PG_FUNCTION_INFO_V1

(

concat_text

)

PG_FUNCTION_INFO_V1() [5/6]

PG_FUNCTION_INFO_V1

(

copytext

)

PG_FUNCTION_INFO_V1() [6/6]

PG_FUNCTION_INFO_V1

(

makepoint

)

Variable Documentation

PG_MODULE_MAGIC

PG_MODULE_MAGIC

Definition at line 16 of file funcs.c.