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1 /*--------------------------------------------------------------------------
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2 NETREK II -- Paradise
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3
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4 Permission to use, copy, modify, and distribute this software and its
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5 documentation, or any derivative works thereof, for any NON-COMMERCIAL
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6 purpose and without fee is hereby granted, provided that this copyright
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7 notice appear in all copies. No representations are made about the
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8 suitability of this software for any purpose. This software is provided
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9 "as is" without express or implied warranty.
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10
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11 Xtrek Copyright 1986 Chris Guthrie
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12 Netrek (Xtrek II) Copyright 1989 Kevin P. Smith
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13 Scott Silvey
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14 Paradise II (Netrek II) Copyright 1993 Larry Denys
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15 Kurt Olsen
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16 Brandon Gillespie
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17 --------------------------------------------------------------------------*/
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18
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19
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20 #include "config.h"
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21
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22 #include <stdio.h>
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23 #include <math.h>
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24 #include <signal.h>
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25 #include <sys/time.h>
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26 #include "defs.h"
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27 #include "struct.h"
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28 #include "data.h"
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29 #include "shmem.h"
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30
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31 struct player *me;
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32 struct ship *myship;
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33 struct stats *mystats;
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34
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35
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36
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37 /*----------------------------VISIBLE FUNCTIONS---------------------------*/
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38
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39 /*-------------------------------ANGDIST----------------------------------*/
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40 /*
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41 * This function provides the proper angular distance between two angles. The
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42 * angles are expressed as numbers from 0-255.
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43 */
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44
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45 int
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46 angdist(x, y)
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47 unsigned char x, y;
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48 {
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49 register unsigned char res; /* temp var */
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50
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51 res = x - y; /* get abs value of difference */
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52 if (res > 128) /* if more than 180 degrees */
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53 return (256 - (int) res); /* then choose to go other way around */
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54 return ((int) res); /* else its just the difference */
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55 }
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56
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57 /*-------------------------------------------------------------------------*/
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58
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59
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60 /*
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61 * this function checks to see if an occurrence is temporally spaced from the
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62 * previous one. This is useful in preventing the client from firing torps
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63 * and missiles too quickly and to limit detting to a reasonable frequency
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64 * (detting too fast burns fuel and increases wtemp without any benefit).
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65 */
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66
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67 int
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68 temporally_spaced(lasttime, gap)
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69 struct timeval *lasttime;
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70 int gap; /* microseconds */
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71 {
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72 struct timeval curtp;
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73
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74 gettimeofday(&curtp, (struct timezone *) 0);
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75 if ((curtp.tv_sec == lasttime->tv_sec &&
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76 curtp.tv_usec < lasttime->tv_usec + gap)
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77 || (curtp.tv_sec == lasttime->tv_sec + 1 &&
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78 curtp.tv_usec + 1000000 < lasttime->tv_usec + gap))
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79 return 0;
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80
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81 lasttime->tv_sec = curtp.tv_sec;
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82 lasttime->tv_usec = curtp.tv_usec;
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83 return 1;
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84 }
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85
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86 /*
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87 */
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88
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89 int
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90 check_fire_warp()
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91 {
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92 if (configvals->fireduringwarp || !(me->p_flags & PFWARP))
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93 return 1;
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94
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95 warning("Can not fire while in warp.");
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96
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97 return 0;
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98 }
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99
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100 int
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101 check_fire_warpprep()
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102 {
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103 if (configvals->fireduringwarpprep || !me->p_warptime)
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104 return 1;
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105
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106 warning("Can not fire while preparing for warp.");
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107
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108 return 0;
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109 }
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110
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111 int
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112 check_fire_docked()
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113 {
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114 if (configvals->firewhiledocked || !(me->p_flags & PFDOCK))
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115 return 1;
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116
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117 warning("It is unsafe to use weapons while docked.");
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118
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119 return 0;
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120 }
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121
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122
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123 /*-------END OF FILE--------*/
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