[Client] Use libowlps-resultreader

Use functions from libowlps-resultreader in receive_position(). By the
way, this function is still not really useful, as we do not verify that
the received result correspond to the set request.

owlps-client/Makefile

@@ -27,8 +27,10 @@ HEADER=
 # Flags
 LIBOWLPS_DIR = ../libowlps
 LIBOWLPSCLIENT_DIR = ../libowlps-client
+LIBOWLPSRESULTREADER_DIR = ../libowlps-resultreader
 CFLAGS = -O2 -Wall -Wextra -Wstrict-prototypes \
-	-I$(LIBOWLPS_DIR) -I$(LIBOWLPSCLIENT_DIR)
+	-I$(LIBOWLPS_DIR) -I$(LIBOWLPSCLIENT_DIR) \
+	-I$(LIBOWLPSRESULTREADER_DIR)
 #CFLAGS += -g -O0
 DEPFLAGS = -MMD
 XCFLAGS = $(CFLAGS) $(DEPFLAGS) $(WARN) $(HEADERS)
@@ -36,7 +38,8 @@ PICFLAG = -fPIC
 OWLPSFLAGS = -D OWLPS_VERSION=\"$(OWLPS_VERSION)\"
 OWLPSFLAGS += -D DEBUG
 LIBS = -L$(LIBOWLPS_DIR) -lowlps \
-	-L$(LIBOWLPSCLIENT_DIR) -lowlps-client
+	-L$(LIBOWLPSCLIENT_DIR) -lowlps-client \
+	-L$(LIBOWLPSRESULTREADER_DIR) -lowlps-resultreader
 
 OS := $(shell uname)
 ifeq ("$(OS)", "Linux")

owlps-client/owlps-client.c

@@ -3,6 +3,7 @@
  */
 
 #include <owlps-client.h>
+#include <owlps-resultreader.h>
 
 #include <stdio.h>
 #include <stdlib.h>
@@ -41,7 +42,7 @@ void print_configuration(void) ;
 void create_socket(void) ;
 void make_packet(void) ;
 void send_request(void) ;
-void receive_position(void) ;
+int receive_position(void) ;
 void print_usage(void) ;
 void print_version(void) ;
 
@@ -87,6 +88,7 @@ uint_fast16_t packet_size ; // Packet size
 int main(int argc, char *argv[])
 {
   struct sigaction action ; // Signal handler structure
+  int ret = 0 ;
 
   program_name = argv[0] ;
   parse_command_line(argc, argv) ;
@@ -112,9 +114,9 @@ int main(int argc, char *argv[])
   close(sockfd) ;
 
   if (options.listening_port > 0)
-    receive_position() ;
+    ret = receive_position() ;
 
-  return 0 ;
+  return ret ;
 }
 
 
@@ -450,18 +452,31 @@ void make_packet()
 
 
 
-void receive_position()
+/*
+ * Receives a position computed by the infrastructure.
+ * Note that it is currently not guaranteed that the received result
+ * correspond to the request sent.
+ * Returns 0, or a non-zero value in case of error.
+ */
+int receive_position()
 {
-  // Position of the mobile as computed by the infrastructure:
-  float x, y, z ;
+  owl_result *result ;
+
+  printf("Waiting for the result from the infrastructure...\n") ;
 
   sockfd = owl_create_udp_listening_socket(options.listening_port) ;
-  recvfrom(sockfd, &x, sizeof(float), 0, NULL, NULL) ;
-  recvfrom(sockfd, &y, sizeof(float), 0, NULL, NULL) ;
-  recvfrom(sockfd, &z, sizeof(float), 0, NULL, NULL) ;
-  close(sockfd) ;
+  if (sockfd < 0)
+    return OWL_ERR_SOCKET_CREATE ;
 
-  printf("Computed position: (%.4f;%.4f;%.4f)\n", x, y, z) ;
+  result = owl_receive_position(sockfd) ;
+  if (result == NULL)
+    return OWL_ERR_SOCKET_RECV ;
+
+  close(sockfd) ;
+  owl_print_result(result) ;
+  owl_free_result(result) ;
+
+  return 0 ;
 }