xorg-server-1.4/hw/xfree86/os-support/misc/xf86_Util.c

   1 /*
   2  * Copyright 1993 by David Wexelblat <dwex@goblin.org>
   3  *
   4  * Permission to use, copy, modify, distribute, and sell this software and its
   5  * documentation for any purpose is hereby granted without fee, provided that
   6  * the above copyright notice appear in all copies and that both that
   7  * copyright notice and this permission notice appear in supporting
   8  * documentation, and that the name of David Wexelblat not be used in
   9  * advertising or publicity pertaining to distribution of the software without
  10  * specific, written prior permission.  David Wexelblat makes no representations
  11  * about the suitability of this software for any purpose.  It is provided
  12  * "as is" without express or implied warranty.
  13  *
  14  * DAVID WEXELBLAT DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
  15  * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
  16  * EVENT SHALL DAVID WEXELBLAT BE LIABLE FOR ANY SPECIAL, INDIRECT OR
  17  * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
  18  * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
  19  * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
  20  * PERFORMANCE OF THIS SOFTWARE.
  21  *
  22  */
  23
  24 /*
  25  * This file is for utility functions that will be shared by other pieces
  26  * of the system.  Putting things here ensure that all the linking order
  27  * dependencies are dealt with, as this library will be linked in last.
  28  */
  29
  30 #ifdef HAVE_XORG_CONFIG_H
  31 #include <xorg-config.h>
  32 #endif
  33
  34 #include <ctype.h>
  35
  36 /* To prevent empty source file warnings */
  37 int _xf86misc;
  38
  39 #if 0
  40 /* For use only with gcc */
  41 #ifdef __GNUC__
  42
  43 #include "os.h"
  44
  45 char *
  46 debug_alloca(char *file, int line, int size)
  47 {
  48         char *ptr;
  49
  50         ptr = Xalloc(size);
  51         ErrorF("Alloc: %s line %d; ptr = 0x%x, length = %d\n", file, line,
  52                ptr, size);
  53         return ptr;
  54 }
  55
  56 void
  57 debug_dealloca(char *file, int line, char *ptr)
  58 {
  59         ErrorF("Dealloc: %s line %d; ptr = 0x%x\n", file, line, ptr);
  60         Xfree(ptr);
  61 }
  62 #endif
  63 #endif
  64
  65 #if defined(ISC) || defined(Lynx)
  66
  67 #include <math.h>
  68
  69 /* Needed for apm_driver.c */
  70 /* These functions are modeled after the functions inside gnu's libc */
  71
  72 static double
  73 copysign(double x, double y)
  74 {
  75         x = fabs(x);
  76         return y < 0 ? - x : x;
  77 }
  78
  79 double
  80 RInt(double x)
  81 {
  82         double s,t;
  83         const double one = 1.0;
  84         const static double L = 4503599627370496.0E0;
  85
  86         if (x!=x)
  87                 return(x);
  88         if (copysign(x,one) >= L)
  89                 return(x);
  90         s = copysign(L,x);
  91         t = x + s;
  92         return (t - s);
  93 }
  94 #endif