+/******************************************************************************
+ This file contains routines that can be bound to a Postgres backend and
+ called by the backend in the process of processing queries. The calling
+ format for these routines is dictated by Postgres architecture.
+******************************************************************************/
+
#include <stdio.h>
/* do not include libpq-fe.h for backend-loaded functions*/
/* #include "libpq-fe.h" */
double y;
} Complex;
+/* These prototypes declare the requirements that Postgres places on these
+ user written functions.
+*/
+Complex * complex_in(char *str);
+char * complex_out(Complex *complex);
+Complex * complex_add(Complex *a, Complex *b);
+bool complex_abs_lt(Complex *a, Complex *b);
+bool complex_abs_le(Complex *a, Complex *b);
+bool complex_abs_eq(Complex *a, Complex *b);
+bool complex_abs_ge(Complex *a, Complex *b);
+bool complex_abs_gt(Complex *a, Complex *b);
+int4 complex_abs_cmp(Complex *a, Complex *b);
+
+
/*****************************************************************************
* Input/Output functions
*****************************************************************************/
return(NULL);
result = (char *) palloc(60);
- sprintf(result, "(%lg,%lg)", complex->x, complex->y);
+ sprintf(result, "(%g,%g)", complex->x, complex->y);
return(result);
}
* POSTGRES crashing, it is impossible to tell whether the bug is in your
* code or POSTGRES's.
*/
+void test_main(void);
void
test_main()
{
+/******************************************************************************
+ These are user-defined functions that can be bound to a Postgres backend
+ and called by Postgres to execute SQL functions of the same name.
+
+ The calling format for these functions is defined by the CREATE FUNCTION
+ SQL statement that binds them to the backend.
+*****************************************************************************/
+
#include <string.h>
#include <stdio.h>
#include "postgres.h" /* for char16, etc. */
#include "utils/palloc.h" /* for palloc */
#include "libpq-fe.h" /* for TUPLE */
+#include "executor/executor.h" /* for GetAttributeByName() */
+
+/* The following prototypes declare what we assume the user declares to
+ Postgres in his CREATE FUNCTION statement.
+*/
+
+int add_one(int arg);
+char16 * concat16(char16 *arg1, char16 *arg2);
+text * copytext(text *t);
+bool c_overpaid(TUPLE t, /* the current instance of EMP */
+ int4 limit);
+
+
int
add_one(int arg)