3 * Return X display size to shell script
5 * (c) 1998 Straylight/Edgeware
8 /*----- Licensing notice --------------------------------------------------*
10 * This file is part of the Edgeware X tools collection.
12 * X tools is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or
15 * (at your option) any later version.
17 * X tools is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
22 * You should have received a copy of the GNU General Public License
23 * along with X tools; if not, write to the Free Software Foundation,
24 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
27 /*----- Header files ------------------------------------------------------*/
35 # include <X11/extensions/Xrandr.h>
38 #include <mLib/alloc.h>
39 #include <mLib/dstr.h>
40 #include <mLib/mdwopt.h>
41 #include <mLib/quis.h>
43 /*----- Data structures ---------------------------------------------------*/
50 /*----- Static variables --------------------------------------------------*/
52 static unsigned int flags = 0;
58 /*----- Main code ---------------------------------------------------------*/
60 static void version(FILE *fp)
61 { pquis(fp, "$ (xtoys version " VERSION ")\n"); }
63 static void usage(FILE *fp)
64 { pquis(fp, "Usage: $ [-bcmx] [-d DISPLAY]\n"); }
66 static void help(FILE *fp)
72 Reads the size of the X root window and outputs it in a form suitable\n\
73 for use as a shell assignment statement, defining variables XWIDTH and\n\
78 -h, --help Display this help text\n\
79 -u, --usage Display a short usage summary\n\
80 -v, --version Display the program's version number\n\
82 -d, --display=DISPLAY Choose X display to connect to\n\
83 -b, --bourne-shell Output text suitable for a Bourne shell\n\
84 -c, --c-shell Output text suitable for a C shell\n\
85 -m, --multiscreen Describe each screen individually\n\
86 -x, --export Export the variables into the environment\n",
90 static void print_var(const char *name, int index, unsigned long value)
95 dstr_putf(&d, "XSCR%d_%s", index, name);
99 printf("%s=%lu", name, value);
100 if (flags & F_EXPORT) printf("; export %s", name);
101 } else if (flags & F_CSH) {
102 if (flags & F_EXPORT) printf("setenv %s %lu", name, value);
103 else printf("set %s=%lu", name, value);
109 static int compare_screen(const void *a, const void *b)
111 const struct screen *s = a, *t = b;
112 if (s->y != t->y) return (s->y < t->y ? -1 : +1);
113 else if (s->x != t->x) return (s->x < t->x ? -1 : +1);
117 int main(int argc, char *argv[])
121 const char *display = 0;
123 unsigned long wd, ht;
129 int rrev, rrerr, rrmaj, rrmin;
130 XRRScreenResources *res;
138 /* --- Parse command line options --- */
143 static struct option opt[] = {
144 { "help", 0, 0, 'h' },
145 { "usage", 0, 0, 'u' },
146 { "version", 0, 0, 'v' },
147 { "display", OPTF_ARGREQ, 0, 'd' },
148 { "bourne-shell", 0, 0, 'b' },
149 { "c-shell", 0, 0, 'c' },
150 { "multiscreen", 0, 0, 'm' },
151 { "export", 0, 0, 'x' },
155 int i = getopt_long(argc, argv, "huv" "d:bcmx", opt, 0);
158 case 'h': help(stdout); exit(0); break;
159 case 'u': usage(stdout); exit(0); break;
160 case 'v': version(stdout); exit(0); break;
161 case 'd': display = optarg; break;
162 case 'b': flags |= F_SH; break;
163 case 'c': flags |= F_CSH; break;
164 case 'm': f |= f_multi; break;
165 case 'x': flags |= F_EXPORT; break;
166 default: f |= f_bogus; break;
170 if (optind < argc) f |= f_bogus;
171 if (f & f_bogus) { usage(stderr); exit(EXIT_FAILURE); }
173 /* --- Sort out the shell type --- *
175 * If the shell name contains the string `csh' then assume it's a C shell.
176 * Otherwise assume it's Bourne. This seems to work in practice.
179 if (!(flags & F_SHELL)) {
181 if (!s) flags |= F_SH;
182 if (strstr(s, "csh")) flags |= F_CSH;
186 if ((flags & F_SH) && (flags & F_CSH)) {
187 fprintf(stderr, "xscsize: make your mind up about your shell type\n");
191 /* --- Open the display --- */
193 dpy = XOpenDisplay(display);
195 fprintf(stderr, "xscsize: couldn't open display\n");
199 /* --- Fetch the root window size --- *
201 * We might need this whatever happens, so go with the flow.
204 sc = DefaultScreen(dpy);
205 wd = DisplayWidth(dpy, sc);
206 ht = DisplayHeight(dpy, sc);
208 /* --- Calculate and produce the necessary output --- *
210 * If we're meant to report on individual screens then try to collect
211 * information about them using the RANDR extension. If that doesn't
212 * exist, or the version is too ancient, or its otherwise not going to
213 * work, then pretend there's just one screen that's the size of the root
219 if (XRRQueryExtension(dpy, &rrev, &rrerr) &&
220 XRRQueryVersion(dpy, &rrmaj, &rrmin) &&
221 (rrmaj > 1 || (rrmaj == 1 && rrmin >= 2))) {
222 root = RootWindow(dpy, sc);
223 res = XRRGetScreenResources(dpy, root);
224 scr = xmalloc(res->ncrtc*sizeof(*scr)); j = 0;
225 for (i = 0; i < res->ncrtc; i++) {
226 crtc = XRRGetCrtcInfo(dpy, res, res->crtcs[i]);
228 scr[j].x = crtc->x; scr[j].wd = crtc->width;
229 scr[j].y = crtc->y; scr[j].ht = crtc->height;
232 XRRFreeCrtcInfo(crtc);
235 XRRFreeScreenResources(res);
239 /* --- The RANDR extension isn't available --- */
242 scr = xmalloc(sizeof(*scr));
243 scr->x = 0; scr->wd = wd;
244 scr->y = 0; scr->ht = ht;
247 /* --- Sort and report the screens --- *
249 * The chances are good that the screens reported by RANDR aren't in any
250 * especially useful order. Sort them into (my) reading order.
253 qsort(scr, nscr, sizeof(*scr), compare_screen);
254 print_var("XNSCR", -1, nscr);
255 for (j = 0; j < nscr; j++) {
256 print_var("X", j, scr[j].x);
257 print_var("Y", j, scr[j].y);
258 print_var("WIDTH", j, scr[j].wd);
259 print_var("HEIGHT", j, scr[j].ht);
262 print_var("XWIDTH", -1, wd);
263 print_var("XHEIGHT", -1, ht);
266 /* --- We're done with the display now --- */
275 /*----- That's all, folks -------------------------------------------------*/