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Convert earthdistance's only C function to v1 call convention,

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to future-proof it against pass-by-value float8.
This commit is contained in:
Tom Lane 2008-04-20 01:05:52 +00:00
parent 7c81d7953c
commit dc192a5d8c
1 changed files with 15 additions and 12 deletions
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27
contrib/earthdistance/earthdistance.c
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@ -1,10 +1,10 @@
/* $PostgreSQL: pgsql/contrib/earthdistance/earthdistance.c,v 1.13 2006/10/19 20:08:03 tgl Exp $ */ /* $PostgreSQL: pgsql/contrib/earthdistance/earthdistance.c,v 1.14 2008/04/20 01:05:52 tgl Exp $ */
#include "postgres.h" #include "postgres.h"
#include <math.h> #include <math.h>
#include "utils/geo_decls.h" /* for Pt */ #include "utils/geo_decls.h" /* for Point */
#ifndef M_PI #ifndef M_PI
#define M_PI 3.14159265358979323846 #define M_PI 3.14159265358979323846
@ -14,10 +14,12 @@
PG_MODULE_MAGIC; PG_MODULE_MAGIC;
/* Earth's radius is in statute miles. */ /* Earth's radius is in statute miles. */
const double EARTH_RADIUS = 3958.747716; static const double EARTH_RADIUS = 3958.747716;
const double TWO_PI = 2.0 * M_PI; static const double TWO_PI = 2.0 * M_PI;
double *geo_distance(Point *pt1, Point *pt2); PG_FUNCTION_INFO_V1(geo_distance);
Datum geo_distance(PG_FUNCTION_ARGS);
/****************************************************** /******************************************************
@ -45,21 +47,22 @@ degtorad(double degrees)
* x-coordinate is longitude in degrees west of Greenwich * x-coordinate is longitude in degrees west of Greenwich
* y-coordinate is latitude in degrees above equator * y-coordinate is latitude in degrees above equator
* *
* returns: double * returns: float8
* distance between the points in miles on earth's surface * distance between the points in miles on earth's surface
******************************************************/ ******************************************************/
double * Datum
geo_distance(Point *pt1, Point *pt2) geo_distance(PG_FUNCTION_ARGS)
{ {
Point *pt1 = PG_GETARG_POINT_P(0);
Point *pt2 = PG_GETARG_POINT_P(1);
float8 result;
double long1, double long1,
lat1, lat1,
long2, long2,
lat2; lat2;
double longdiff; double longdiff;
double sino; double sino;
double *resultp = palloc(sizeof(double));
/* convert degrees to radians */ /* convert degrees to radians */
@ -78,7 +81,7 @@ geo_distance(Point *pt1, Point *pt2)
cos(lat1) * cos(lat2) * sin(longdiff / 2.) * sin(longdiff / 2.)); cos(lat1) * cos(lat2) * sin(longdiff / 2.) * sin(longdiff / 2.));
if (sino > 1.) if (sino > 1.)
sino = 1.; sino = 1.;
*resultp = 2. * EARTH_RADIUS * asin(sino); result = 2. * EARTH_RADIUS * asin(sino);
return resultp; PG_RETURN_FLOAT8(result);
} }