Convert connection functions to return error objects.

diff --git a/src/xcb_conn.c b/src/xcb_conn.c
index b0d727b..0176524 100644 (file)
--- a/src/xcb_conn.c
+++ b/src/xcb_conn.c
@@ -44,6 +44,8 @@ typedef struct {
     CARD16 length;
 } XCBSetupGeneric;
 
+static const int error_connection = 1;
+
 static int set_fd_flags(const int fd)
 {
     long flags = fcntl(fd, F_GETFL, 0);
@@ -199,7 +201,7 @@ XCBConnection *XCBConnectToFD(int fd, XCBAuthInfo *auth_info)
 
     c = calloc(1, sizeof(XCBConnection));
     if(!c)
-        return 0;
+        return (XCBConnection *) &error_connection;
 
     c->fd = fd;
 
@@ -215,7 +217,7 @@ XCBConnection *XCBConnectToFD(int fd, XCBAuthInfo *auth_info)
         ))
     {
         XCBDisconnect(c);
-        return 0;
+        return (XCBConnection *) &error_connection;
     }
 
     return c;

diff --git a/src/xcb_util.c b/src/xcb_util.c
index 3bdcd36..d93353b 100644 (file)
--- a/src/xcb_util.c
+++ b/src/xcb_util.c
@@ -45,6 +45,8 @@
 #include "xcbext.h"
 #include "xcbint.h"
 
+static const int error_connection = 1;
+
 int XCBPopcount(CARD32 mask)
 {
     unsigned long y;
@@ -212,11 +214,11 @@ XCBConnection *XCBConnect(const char *displayname, int *screenp)
     XCBAuthInfo auth;
 
     if(!XCBParseDisplay(displayname, &host, &display, screenp))
-        return 0;
+        return (XCBConnection *) &error_connection;
     fd = _xcb_open(host, display);
     free(host);
     if(fd == -1)
-        return 0;
+        return (XCBConnection *) &error_connection;
 
     _xcb_get_auth_info(fd, &auth);
     c = XCBConnectToFD(fd, &auth);
@@ -231,11 +233,11 @@ XCBConnection *XCBConnectToDisplayWithAuthInfo(const char *displayname, XCBAuthI
     char *host;
 
     if(!XCBParseDisplay(displayname, &host, &display, screenp))
-        return 0;
+        return (XCBConnection *) &error_connection;
     fd = _xcb_open(host, display);
     free(host);
     if(fd == -1)
-        return 0;
+        return (XCBConnection *) &error_connection;
 
     return XCBConnectToFD(fd, auth);
 }