mdw@git.distorted.org.uk Git - xtoys/blob - xwarpptr.c

   1 /* -*-c-*-
   2  *
   3  * Warp pointer to a specific location
   4  *
   5  * (c) 2022 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 it
  13  * under the terms of the GNU General Public License as published by the
  14  * Free Software Foundation; either version 2 of the License, or (at your
  15  * option) any later version.
  16  *
  17  * X tools is distributed in the hope that it will be useful, but WITHOUT
  18  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  19  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  20  * 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 <errno.h>
  30 #include <limits.h>
  31 #include <stdio.h>
  32 #include <stdlib.h>
  33
  34 #include <X11/Xlib.h>
  35
  36 #include <mLib/alloc.h>
  37 #include <mLib/macros.h>
  38 #include <mLib/mdwopt.h>
  39 #include <mLib/quis.h>
  40 #include <mLib/report.h>
  41
  42 /*----- Help and version information --------------------------------------*/
  43
  44 static void version(void)
  45   { pquis(stdout, "$ version " VERSION "\n"); }
  46
  47 static void usage(FILE *fp)
  48   { pquis(fp, "Usage: $ [-d DISPLAY] X Y\n"); }
  49
  50 static void help(void)
  51 {
  52   version(); putchar('\n');
  53   usage(stdout);
  54   fputs("\n\
  55 Warp mouse pointer to position X, Y on the screen.\n\
  56 \n\
  57 Command-line options:\n\
  58 \n\
  59 -h, --help                      Display this help.\n\
  60 -v, --version                   Display program's version number.\n\
  61 -u, --usage                     Display short usage summary.\n\
  62 \n\
  63 -d, --display=DISPLAY           Connect to X DISPLAY.\n",
  64         stdout);
  65 }
  66
  67 /*----- Main program ------------------------------------------------------*/
  68
  69 static int parse_int(const char *p)
  70 {
  71   char *q;
  72   int err;
  73   long i;
  74
  75   err = errno; errno = 0;
  76   if (!*p || ISSPACE(*p)) goto bad;
  77   i = strtol(p, &q, 0);
  78   if (err || *q || i < INT_MIN || i > INT_MAX) goto bad;
  79   return ((int)i);
  80
  81 bad:
  82   die(1, "bad integer `%s'", p);
  83 }
  84
  85 int main(int argc, char *argv[])
  86 {
  87   const char *display = 0;
  88   Display *dpy = 0;
  89   int sc;
  90   Window w;
  91   char **fixups; int nfixups, i;
  92   int x, y, xmin, xmax, ymin, ymax, wd, ht;
  93
  94   unsigned f = 0;
  95 #define f_bogus 1u
  96 #define f_relative 2u
  97 #define f_neg 4u
  98
  99   ego(argv[0]);
 100
 101   /* An initial pass over the argument vector.
 102    *
 103    * Negative numbers look like options, but we don't want them treated that
 104    * way.  So we're going to hide them from the option parser for a bit.
 105    */
 106   fixups = xmalloc(argc*sizeof(char *));
 107   for (i = 0, nfixups = 0; i < argc; i++)
 108     if (argv[i][0] == '-' && ISDIGIT(argv[i][1]))
 109       { fixups[nfixups++] = argv[i]; argv[i][0] = '?'; }
 110
 111   /* Parse arguments. */
 112   for (;;) {
 113     static struct option opt[] = {
 114       { "help",         0,                      0,      'h' },
 115       { "usage",        0,                      0,      'u' },
 116       { "version",      0,                      0,      'v' },
 117       { "display",      OPTF_ARGREQ,            0,      'd' },
 118       { "relative",     0,                      0,      'r' },
 119       { 0,              0,                      0,      0 }
 120     };
 121
 122     i = mdwopt(argc, argv, "huvd:r", opt, 0, 0, 0); if (i < 0) break;
 123     switch (i) {
 124       case 'h': help(); exit(0);
 125       case 'u': usage(stdout); exit(0);
 126       case 'v': version(); exit(0);
 127       case 'd': display = optarg; break;
 128       case 'r': f |= f_relative; break;
 129       default: f |= f_bogus; break;
 130     }
 131   }
 132   if ((f&f_bogus) || argc - optind != 2) {
 133     usage(stderr);
 134     exit(EXIT_FAILURE);
 135   }
 136
 137   /* Undo the fixups and fish out the numbers. */
 138   for (i = 0; i < nfixups; i++) *fixups[i] = '-';
 139   x = parse_int(argv[optind]);
 140   y = parse_int(argv[optind + 1]);
 141
 142   /* Open the display and the screen size. */
 143   if ((dpy = XOpenDisplay(display)) == 0)
 144     die(EXIT_FAILURE, "couldn't open display");
 145   sc = DefaultScreen(dpy);
 146   wd = DisplayWidth(dpy, sc);
 147   ht = DisplayHeight(dpy, sc);
 148
 149   /* Interpret the coordinates and check that they're in range. */
 150   if (f&f_relative) {
 151     w = None;
 152     xmin = -wd + 1; ymin = -ht + 1; xmax = wd - 1; ymax = ht - 1;
 153   } else {
 154     if (x < 0) x += wd;
 155     if (y < 0) y += ht;
 156     w = RootWindow(dpy, sc);
 157     xmin = ymin = 0; xmax = wd - 1; ymax = ht - 1;
 158   }
 159   if (x < xmin || x > xmax || y < ymin || y > ymax)
 160     die(1, "coordinates out of range");
 161
 162   /* Do the work. */
 163   XWarpPointer(dpy, None, w, 0, 0, 0, 0, x, y);
 164
 165   /* Done. */
 166   XCloseDisplay(dpy);
 167   return (0);
 168
 169 #undef f_bogus
 170 #undef f_relative
 171 }
 172
 173 /*----- That's all, folks -------------------------------------------------*/