/* $Xorg: XnestDis.c,v 1.4 2001/02/09 02:05:58 xorgcvs Exp $ */ /* Copyright 1996, 1998 The Open Group Permission to use, copy, modify, distribute, and sell this software and its documentation for any purpose is hereby granted without fee, provided that the above copyright notice appear in all copies and that both that copyright notice and this permission notice appear in supporting documentation. The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABIL- ITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABIL- ITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. Except as contained in this notice, the name of The Open Group shall not be used in advertising or otherwise to promote the sale, use or other dealings in this Software without prior written authorization from The Open Group. */ /* $XFree86: xc/programs/xrx/xnest-plugin/XnestDis.c,v 1.3 2003/07/20 16:12:21 tsi Exp $ */ #include "RxPlugin.h" /*********************************************************************** * Utility functions and global variable to manage display numbers ***********************************************************************/ /* maximum numbers of concurrent instances */ #define MAX_PLUGINS 10 /* start from 5 to avoid possible conflict with multi-display X server */ #define XNEST_OFFSET 5 /* global allowing to know which display numbers are in use */ static int16 xnest_display_numbers[MAX_PLUGINS]; void RxpInitXnestDisplayNumbers() { memset(xnest_display_numbers, 0, sizeof(int16) * MAX_PLUGINS); } /* function returning first display number available */ int RxpXnestDisplayNumber() { int i; for (i = 0; i < MAX_PLUGINS; i++) if (xnest_display_numbers[i] == 0) { xnest_display_numbers[i] = 1; return i + XNEST_OFFSET; } /* no more available */ return -1; } /* function returning first display number available */ void RxpFreeXnestDisplayNumber(int i) { xnest_display_numbers[i - XNEST_OFFSET] = 0; } /* function returning display name with specified display number */ char * RxpXnestDisplay(int display_number) { static char name[1024]; char *display_name, *dpy_name, *display_num, *screen_num; display_name = getenv("DISPLAY"); if (display_name == NULL) return NULL; /* if of the form x11:display skip scheme part */ if (strncmp(display_name, "x11:", 4) == 0) dpy_name = display_name + 4; else dpy_name = display_name; /* Check for RFC 2732 bracketed IPv6 numeric address */ if (*dpy_name == '[') { while (*dpy_name && (*dpy_name != ']')) { dpy_name++; } } /* display number is after next ":" character */ display_num = strchr(dpy_name, ':'); if (display_num == NULL) /* invalid display specification */ return NULL; /* copy display name up to the display number */ strncpy(name, display_name, display_num - display_name); /* override display_number */ sprintf(name + (display_num - display_name), ":%d", display_number); /* append screen number */ screen_num = strchr(display_num, '.'); if (screen_num != NULL) strcat(name, screen_num); return name; }