add GEO function get_line_distance_km

HISTORY

 
+Version 1.20  2015-08-06
+  * add GEO function get_line_distance_km
+
 Version 1.19  2015-07-24
   * correct logger rotate time near 0 clock
 

libfastcommon.spec

@@ -2,7 +2,7 @@
 %define LibFastcommonDevel  libfastcommon-devel
 
 Name: libfastcommon
-Version: 1.0.19
+Version: 1.0.20
 Release: 1%{?dist}
 Summary: c common functions library extracted from my open source projects FastDFS
 License: GPL

php-fastcommon/fastcommon.c

@@ -21,6 +21,7 @@
 #include "logger.h"
 #include "hash.h"
 #include "sockopt.h"
+#include "shared_func.h"
 #include "fastcommon.h"
 
 #define MAJOR_VERSION  1
@@ -40,6 +41,7 @@ const zend_fcall_info empty_fcall_info = { 0, NULL, NULL, NULL, NULL, 0, NULL, N
 		ZEND_FE(fastcommon_gethostaddrs, NULL)
 		ZEND_FE(fastcommon_time33_hash, NULL)
 		ZEND_FE(fastcommon_simple_hash, NULL)
+		ZEND_FE(fastcommon_get_line_distance_km, NULL)
 		{NULL, NULL, NULL}  /* Must be the last line */
 	};
 
@@ -240,3 +242,35 @@ ZEND_FUNCTION(fastcommon_simple_hash)
     RETURN_LONG(simple_hash(str, str_len) & 0x7FFFFFFF);
 }
 
+/*
+double fastcommon_get_line_distance_km(double lat1, double lon1,
+        double lat2, double lon2)
+return line distance in KM
+*/
+ZEND_FUNCTION(fastcommon_get_line_distance_km)
+{
+	int argc;
+    double lat1;
+    double lon1;
+    double lat2;
+    double lon2;
+
+	argc = ZEND_NUM_ARGS();
+	if (argc != 4) {
+		logError("file: "__FILE__", line: %d, "
+			"fastcommon_get_line_distance_km parameters count: %d is invalid",
+			__LINE__, argc);
+		RETURN_BOOL(false);
+	}
+
+	if (zend_parse_parameters(argc TSRMLS_CC, "dddd", &lat1, &lon1,
+                &lat2, &lon2) == FAILURE)
+	{
+		logError("file: "__FILE__", line: %d, "
+			"zend_parse_parameters fail!", __LINE__);
+		RETURN_BOOL(false);
+	}
+
+    RETURN_DOUBLE(get_line_distance_km(lat1, lon1, lat2, lon2));
+}
+

php-fastcommon/fastcommon.h

@@ -21,6 +21,7 @@ ZEND_FUNCTION(fastcommon_version);
 ZEND_FUNCTION(fastcommon_gethostaddrs);
 ZEND_FUNCTION(fastcommon_time33_hash);
 ZEND_FUNCTION(fastcommon_simple_hash);
+ZEND_FUNCTION(fastcommon_get_line_distance_km);
 
 #ifdef __cplusplus
 }

src/shared_func.c

@@ -23,6 +23,7 @@
 #include <dirent.h>
 #include <grp.h>
 #include <pwd.h>
+#include <math.h>
 #include "shared_func.h"
 #include "logger.h"
 #include "sockopt.h"
@@ -2092,3 +2093,21 @@ int ignore_signal_pipe()
 	return 0;
 }
 
+double get_line_distance_km(const double lat1, const double lon1,
+        const double lat2, const double lon2)
+{
+#define FAST_ABS(v) ((v) >= 0 ? (v) : -1 * (v))
+#define DISTANCE_PER_LATITUDE 111.111
+
+    double lat_value;
+    double lng_distance;
+    double lat_distance;
+
+    lat_value = FAST_ABS(lat1) < FAST_ABS(lat2) ? lat1 : lat2;
+    lat_distance = FAST_ABS(lat1 - lat2) * DISTANCE_PER_LATITUDE;
+    lng_distance = FAST_ABS(lon1 - lon2) * DISTANCE_PER_LATITUDE *
+        cos(lat_value * 3.1415926 / 180.0);
+
+    return sqrt(lat_distance * lat_distance + lng_distance * lng_distance);
+}
+

src/shared_func.h

@@ -512,6 +512,9 @@ int set_file_utimes(const char *filename, const time_t new_time);
 */
 int ignore_signal_pipe();
 
+double get_line_distance_km(const double lat1, const double lon1,
+        const double lat2, const double lon2);
+
 #ifdef __cplusplus
 }
 #endif