| 1 | /* -*-c-*- |
| 2 | * |
| 3 | * Return X display size to shell script |
| 4 | * |
| 5 | * (c) 1998 Straylight/Edgeware |
| 6 | */ |
| 7 | |
| 8 | /*----- Licensing notice --------------------------------------------------* |
| 9 | * |
| 10 | * This file is part of the Edgeware X tools collection. |
| 11 | * |
| 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. |
| 16 | * |
| 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. |
| 21 | * |
| 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. |
| 25 | */ |
| 26 | |
| 27 | /*----- Header files ------------------------------------------------------*/ |
| 28 | |
| 29 | #include <stdio.h> |
| 30 | #include <stdlib.h> |
| 31 | #include <string.h> |
| 32 | |
| 33 | #include <X11/Xlib.h> |
| 34 | #ifdef HAVE_XRANDR |
| 35 | # include <X11/extensions/Xrandr.h> |
| 36 | #endif |
| 37 | |
| 38 | #include <mLib/alloc.h> |
| 39 | #include <mLib/dstr.h> |
| 40 | #include <mLib/mdwopt.h> |
| 41 | #include <mLib/quis.h> |
| 42 | |
| 43 | /*----- Data structures ---------------------------------------------------*/ |
| 44 | |
| 45 | struct screen { |
| 46 | int x, y; |
| 47 | unsigned wd, ht; |
| 48 | }; |
| 49 | |
| 50 | /*----- Static variables --------------------------------------------------*/ |
| 51 | |
| 52 | static unsigned int flags = 0; |
| 53 | #define F_SH 1u |
| 54 | #define F_CSH 2u |
| 55 | #define F_SHELL 3u |
| 56 | #define F_EXPORT 4u |
| 57 | |
| 58 | /*----- Main code ---------------------------------------------------------*/ |
| 59 | |
| 60 | static void version(FILE *fp) |
| 61 | { pquis(fp, "$ (xtoys version " VERSION ")\n"); } |
| 62 | |
| 63 | static void usage(FILE *fp) |
| 64 | { pquis(fp, "Usage: $ [-bcmx] [-d DISPLAY]\n"); } |
| 65 | |
| 66 | static void help(FILE *fp) |
| 67 | { |
| 68 | version(fp); |
| 69 | fputc('\n', fp); |
| 70 | usage(stdout); |
| 71 | fputs("\n\ |
| 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\ |
| 74 | XHEIGHT.\n\ |
| 75 | \n\ |
| 76 | Options:\n\ |
| 77 | \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\ |
| 81 | \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", |
| 87 | fp); |
| 88 | } |
| 89 | |
| 90 | static void print_var(const char *name, int index, unsigned long value) |
| 91 | { |
| 92 | dstr d = DSTR_INIT; |
| 93 | |
| 94 | if (index >= 0) { |
| 95 | dstr_putf(&d, "XSCR%d_%s", index, name); |
| 96 | name = d.buf; |
| 97 | } |
| 98 | if (flags & F_SH) { |
| 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); |
| 104 | } |
| 105 | putchar('\n'); |
| 106 | dstr_destroy(&d); |
| 107 | } |
| 108 | |
| 109 | static int compare_screen(const void *a, const void *b) |
| 110 | { |
| 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); |
| 114 | else return (0); |
| 115 | } |
| 116 | |
| 117 | int main(int argc, char *argv[]) |
| 118 | { |
| 119 | Display *dpy; |
| 120 | const char *s; |
| 121 | const char *display = 0; |
| 122 | unsigned f = 0; |
| 123 | unsigned long wd, ht; |
| 124 | int sc; |
| 125 | struct screen *scr; |
| 126 | size_t nscr, j; |
| 127 | #ifdef HAVE_XRANDR |
| 128 | Window root; |
| 129 | int rrev, rrerr, rrmaj, rrmin; |
| 130 | XRRScreenResources *res; |
| 131 | XRRCrtcInfo *crtc; |
| 132 | int i; |
| 133 | #endif |
| 134 | |
| 135 | #define f_bogus 1u |
| 136 | #define f_multi 2u |
| 137 | |
| 138 | /* --- Parse command line options --- */ |
| 139 | |
| 140 | ego(argv[0]); |
| 141 | |
| 142 | for (;;) { |
| 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' }, |
| 152 | { 0, 0, 0, 0 } |
| 153 | }; |
| 154 | |
| 155 | int i = getopt_long(argc, argv, "huv" "d:bcmx", opt, 0); |
| 156 | if (i < 0) break; |
| 157 | switch (i) { |
| 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; |
| 167 | } |
| 168 | } |
| 169 | |
| 170 | if (optind < argc) f |= f_bogus; |
| 171 | if (f & f_bogus) { usage(stderr); exit(EXIT_FAILURE); } |
| 172 | |
| 173 | /* --- Sort out the shell type --- * |
| 174 | * |
| 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. |
| 177 | */ |
| 178 | |
| 179 | if (!(flags & F_SHELL)) { |
| 180 | s = getenv("SHELL"); |
| 181 | if (!s) flags |= F_SH; |
| 182 | if (strstr(s, "csh")) flags |= F_CSH; |
| 183 | else flags |= F_SH; |
| 184 | } |
| 185 | |
| 186 | if ((flags & F_SH) && (flags & F_CSH)) { |
| 187 | fprintf(stderr, "xscsize: make your mind up about your shell type\n"); |
| 188 | exit(EXIT_FAILURE); |
| 189 | } |
| 190 | |
| 191 | /* --- Open the display --- */ |
| 192 | |
| 193 | dpy = XOpenDisplay(display); |
| 194 | if (!dpy) { |
| 195 | fprintf(stderr, "xscsize: couldn't open display\n"); |
| 196 | exit(EXIT_FAILURE); |
| 197 | } |
| 198 | |
| 199 | /* --- Fetch the root window size --- * |
| 200 | * |
| 201 | * We might need this whatever happens, so go with the flow. |
| 202 | */ |
| 203 | |
| 204 | sc = DefaultScreen(dpy); |
| 205 | wd = DisplayWidth(dpy, sc); |
| 206 | ht = DisplayHeight(dpy, sc); |
| 207 | |
| 208 | /* --- Calculate and produce the necessary output --- * |
| 209 | * |
| 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 |
| 214 | * window. |
| 215 | */ |
| 216 | |
| 217 | if (f & f_multi) { |
| 218 | #ifdef HAVE_XRANDR |
| 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]); |
| 227 | if (crtc->mode) { |
| 228 | scr[j].x = crtc->x; scr[j].wd = crtc->width; |
| 229 | scr[j].y = crtc->y; scr[j].ht = crtc->height; |
| 230 | j++; |
| 231 | } |
| 232 | XRRFreeCrtcInfo(crtc); |
| 233 | } |
| 234 | nscr = j; |
| 235 | XRRFreeScreenResources(res); |
| 236 | } else |
| 237 | #endif |
| 238 | { |
| 239 | /* --- The RANDR extension isn't available --- */ |
| 240 | |
| 241 | nscr = 1; |
| 242 | scr = xmalloc(sizeof(*scr)); |
| 243 | scr->x = 0; scr->wd = wd; |
| 244 | scr->y = 0; scr->ht = ht; |
| 245 | } |
| 246 | |
| 247 | /* --- Sort and report the screens --- * |
| 248 | * |
| 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. |
| 251 | */ |
| 252 | |
| 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); |
| 260 | } |
| 261 | } else { |
| 262 | print_var("XWIDTH", -1, wd); |
| 263 | print_var("XHEIGHT", -1, ht); |
| 264 | } |
| 265 | |
| 266 | /* --- We're done with the display now --- */ |
| 267 | |
| 268 | XCloseDisplay(dpy); |
| 269 | |
| 270 | /* --- Done --- */ |
| 271 | |
| 272 | return (0); |
| 273 | } |
| 274 | |
| 275 | /*----- That's all, folks -------------------------------------------------*/ |