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annotate src/stdlib/SDL_qsort.c @ 4245:0319c84d274d SDL-1.2

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Fixed 32-bit build
author Sam Lantinga <slouken@libsdl.org>
date Sat, 26 Sep 2009 21:38:07 +0000
parents 5bacec0933f5
children
rev   line source
1330
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
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1 /* qsort.c
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2 * (c) 1998 Gareth McCaughan
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3 *
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4 * This is a drop-in replacement for the C library's |qsort()| routine.
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5 *
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6 * Features:
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7 * - Median-of-three pivoting (and more)
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8 * - Truncation and final polishing by a single insertion sort
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9 * - Early truncation when no swaps needed in pivoting step
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10 * - Explicit recursion, guaranteed not to overflow
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11 * - A few little wrinkles stolen from the GNU |qsort()|.
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12 * - separate code for non-aligned / aligned / word-size objects
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13 *
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14 * This code may be reproduced freely provided
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15 * - this file is retained unaltered apart from minor
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16 * changes for portability and efficiency
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17 * - no changes are made to this comment
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18 * - any changes that *are* made are clearly flagged
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19 * - the _ID string below is altered by inserting, after
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20 * the date, the string " altered" followed at your option
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21 * by other material. (Exceptions: you may change the name
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22 * of the exported routine without changing the ID string.
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23 * You may change the values of the macros TRUNC_* and
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24 * PIVOT_THRESHOLD without changing the ID string, provided
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25 * they remain constants with TRUNC_nonaligned, TRUNC_aligned
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26 * and TRUNC_words/WORD_BYTES between 8 and 24, and
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27 * PIVOT_THRESHOLD between 32 and 200.)
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28 *
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29 * You may use it in anything you like; you may make money
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30 * out of it; you may distribute it in object form or as
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31 * part of an executable without including source code;
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32 * you don't have to credit me. (But it would be nice if
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33 * you did.)
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34 *
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35 * If you find problems with this code, or find ways of
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36 * making it significantly faster, please let me know!
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37 * My e-mail address, valid as of early 1998 and certainly
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38 * OK for at least the next 18 months, is
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39 * gjm11@dpmms.cam.ac.uk
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40 * Thanks!
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41 *
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42 * Gareth McCaughan Peterhouse Cambridge 1998
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43 */
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44 #include "SDL_config.h"
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45
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46 /*
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47 #include <assert.h>
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48 #include <stdlib.h>
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49 #include <string.h>
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50 */
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51 #include "SDL_stdinc.h"
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52
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53 #ifdef assert
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54 #undef assert
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55 #endif
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56 #define assert(X)
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57 #ifdef malloc
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58 #undef malloc
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59 #endif
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60 #define malloc SDL_malloc
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61 #ifdef free
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62 #undef free
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63 #endif
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64 #define free SDL_free
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65 #ifdef memcpy
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66 #undef memcpy
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67 #endif
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68 #define memcpy SDL_memcpy
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69 #ifdef memmove
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70 #undef memmove
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71 #endif
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72 #define memmove SDL_memmove
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73 #ifdef qsort
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74 #undef qsort
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75 #endif
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76 #define qsort SDL_qsort
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77
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78
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79 #ifndef HAVE_QSORT
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80
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81 static char _ID[]="<qsort.c gjm 1.12 1998-03-19>";
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82
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83 /* How many bytes are there per word? (Must be a power of 2,
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84 * and must in fact equal sizeof(int).)
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85 */
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86 #define WORD_BYTES sizeof(int)
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87
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88 /* How big does our stack need to be? Answer: one entry per
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89 * bit in a |size_t|.
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90 */
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91 #define STACK_SIZE (8*sizeof(size_t))
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92
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93 /* Different situations have slightly different requirements,
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94 * and we make life epsilon easier by using different truncation
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95 * points for the three different cases.
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96 * So far, I have tuned TRUNC_words and guessed that the same
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97 * value might work well for the other two cases. Of course
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98 * what works well on my machine might work badly on yours.
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99 */
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100 #define TRUNC_nonaligned 12
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101 #define TRUNC_aligned 12
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102 #define TRUNC_words 12*WORD_BYTES /* nb different meaning */
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103
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104 /* We use a simple pivoting algorithm for shortish sub-arrays
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105 * and a more complicated one for larger ones. The threshold
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106 * is PIVOT_THRESHOLD.
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107 */
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108 #define PIVOT_THRESHOLD 40
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109
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110 typedef struct { char * first; char * last; } stack_entry;
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111 #define pushLeft {stack[stacktop].first=ffirst;stack[stacktop++].last=last;}
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112 #define pushRight {stack[stacktop].first=first;stack[stacktop++].last=llast;}
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113 #define doLeft {first=ffirst;llast=last;continue;}
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114 #define doRight {ffirst=first;last=llast;continue;}
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115 #define pop {if (--stacktop<0) break;\
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116 first=ffirst=stack[stacktop].first;\
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117 last=llast=stack[stacktop].last;\
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118 continue;}
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119
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120 /* Some comments on the implementation.
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121 * 1. When we finish partitioning the array into "low"
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122 * and "high", we forget entirely about short subarrays,
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123 * because they'll be done later by insertion sort.
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124 * Doing lots of little insertion sorts might be a win
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125 * on large datasets for locality-of-reference reasons,
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126 * but it makes the code much nastier and increases
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127 * bookkeeping overhead.
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128 * 2. We always save the shorter and get to work on the
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129 * longer. This guarantees that every time we push
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130 * an item onto the stack its size is <= 1/2 of that
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131 * of its parent; so the stack can't need more than
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132 * log_2(max-array-size) entries.
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133 * 3. We choose a pivot by looking at the first, last
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134 * and middle elements. We arrange them into order
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135 * because it's easy to do that in conjunction with
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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diff changeset
136 * choosing the pivot, and it makes things a little
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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diff changeset
137 * easier in the partitioning step. Anyway, the pivot
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diff changeset
138 * is the middle of these three. It's still possible
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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diff changeset
139 * to construct datasets where the algorithm takes
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diff changeset
140 * time of order n^2, but it simply never happens in
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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141 * practice.
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142 * 3' Newsflash: On further investigation I find that
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143 * it's easy to construct datasets where median-of-3
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144 * simply isn't good enough. So on large-ish subarrays
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145 * we do a more sophisticated pivoting: we take three
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146 * sets of 3 elements, find their medians, and then
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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147 * take the median of those.
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148 * 4. We copy the pivot element to a separate place
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149 * because that way we can always do our comparisons
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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150 * directly against a pointer to that separate place,
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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diff changeset
151 * and don't have to wonder "did we move the pivot
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152 * element?". This makes the inner loop better.
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153 * 5. It's possible to make the pivoting even more
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154 * reliable by looking at more candidates when n
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155 * is larger. (Taking this to its logical conclusion
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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156 * results in a variant of quicksort that doesn't
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157 * have that n^2 worst case.) However, the overhead
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158 * from the extra bookkeeping means that it's just
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159 * not worth while.
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160 * 6. This is pretty clean and portable code. Here are
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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161 * all the potential portability pitfalls and problems
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162 * I know of:
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163 * - In one place (the insertion sort) I construct
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164 * a pointer that points just past the end of the
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165 * supplied array, and assume that (a) it won't
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166 * compare equal to any pointer within the array,
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167 * and (b) it will compare equal to a pointer
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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168 * obtained by stepping off the end of the array.
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169 * These might fail on some segmented architectures.
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170 * - I assume that there are 8 bits in a |char| when
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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171 * computing the size of stack needed. This would
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172 * fail on machines with 9-bit or 16-bit bytes.
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173 * - I assume that if |((int)base&(sizeof(int)-1))==0|
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174 * and |(size&(sizeof(int)-1))==0| then it's safe to
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175 * get at array elements via |int*|s, and that if
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176 * actually |size==sizeof(int)| as well then it's
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177 * safe to treat the elements as |int|s. This might
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178 * fail on systems that convert pointers to integers
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179 * in non-standard ways.
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180 * - I assume that |8*sizeof(size_t)<=INT_MAX|. This
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181 * would be false on a machine with 8-bit |char|s,
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182 * 16-bit |int|s and 4096-bit |size_t|s. :-)
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183 */
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184
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185 /* The recursion logic is the same in each case: */
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186 #define Recurse(Trunc) \
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187 { size_t l=last-ffirst,r=llast-first; \
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188 if (l<Trunc) { \
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189 if (r>=Trunc) doRight \
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190 else pop \
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191 } \
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192 else if (l<=r) { pushLeft; doRight } \
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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193 else if (r>=Trunc) { pushRight; doLeft }\
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194 else doLeft \
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195 }
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196
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197 /* and so is the pivoting logic: */
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198 #define Pivot(swapper,sz) \
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199 if ((size_t)(last-first)>PIVOT_THRESHOLD*sz) mid=pivot_big(first,mid,last,sz,compare);\
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200 else { \
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201 if (compare(first,mid)<0) { \
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202 if (compare(mid,last)>0) { \
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203 swapper(mid,last); \
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204 if (compare(first,mid)>0) swapper(first,mid);\
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205 } \
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206 } \
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207 else { \
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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208 if (compare(mid,last)>0) swapper(first,last)\
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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209 else { \
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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210 swapper(first,mid); \
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211 if (compare(mid,last)>0) swapper(mid,last);\
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212 } \
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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213 } \
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214 first+=sz; last-=sz; \
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215 }
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216
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217 #ifdef DEBUG_QSORT
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218 #include <stdio.h>
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219 #endif
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220
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221 /* and so is the partitioning logic: */
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222 #define Partition(swapper,sz) { \
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223 int swapped=0; \
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224 do { \
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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225 while (compare(first,pivot)<0) first+=sz; \
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226 while (compare(pivot,last)<0) last-=sz; \
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227 if (first<last) { \
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228 swapper(first,last); swapped=1; \
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229 first+=sz; last-=sz; } \
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230 else if (first==last) { first+=sz; last-=sz; break; }\
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231 } while (first<=last); \
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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232 if (!swapped) pop \
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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233 }
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234
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235 /* and so is the pre-insertion-sort operation of putting
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236 * the smallest element into place as a sentinel.
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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237 * Doing this makes the inner loop nicer. I got this
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238 * idea from the GNU implementation of qsort().
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239 */
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240 #define PreInsertion(swapper,limit,sz) \
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241 first=base; \
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242 last=first + (nmemb>limit ? limit : nmemb-1)*sz;\
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243 while (last!=base) { \
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244 if (compare(first,last)>0) first=last; \
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245 last-=sz; } \
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246 if (first!=base) swapper(first,(char*)base);
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247
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248 /* and so is the insertion sort, in the first two cases: */
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249 #define Insertion(swapper) \
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250 last=((char*)base)+nmemb*size; \
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251 for (first=((char*)base)+size;first!=last;first+=size) { \
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252 char *test; \
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253 /* Find the right place for |first|. \
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254 * My apologies for var reuse. */ \
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255 for (test=first-size;compare(test,first)>0;test-=size) ; \
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256 test+=size; \
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257 if (test!=first) { \
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258 /* Shift everything in [test,first) \
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259 * up by one, and place |first| \
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260 * where |test| is. */ \
1337
c687f06c7473 Don't touch code that we brought in from other sources
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261 memcpy(pivot,first,size); \
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262 memmove(test+size,test,first-test); \
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263 memcpy(test,pivot,size); \
1330
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diff changeset
264 } \
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diff changeset
265 }
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266
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267 #define SWAP_nonaligned(a,b) { \
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268 register char *aa=(a),*bb=(b); \
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269 register size_t sz=size; \
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diff changeset
270 do { register char t=*aa; *aa++=*bb; *bb++=t; } while (--sz); }
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271
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272 #define SWAP_aligned(a,b) { \
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273 register int *aa=(int*)(a),*bb=(int*)(b); \
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274 register size_t sz=size; \
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275 do { register int t=*aa;*aa++=*bb; *bb++=t; } while (sz-=WORD_BYTES); }
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276
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277 #define SWAP_words(a,b) { \
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diff changeset
278 register int t=*((int*)a); *((int*)a)=*((int*)b); *((int*)b)=t; }
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279
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diff changeset
280 /* ---------------------------------------------------------------------- */
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281
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diff changeset
282 static char * pivot_big(char *first, char *mid, char *last, size_t size,
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diff changeset
283 int compare(const void *, const void *)) {
1456
84de7511f79f Fixed a bunch of 64-bit compatibility problems
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284 size_t d=(((last-first)/size)>>3)*size;
1330
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285 char *m1,*m2,*m3;
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diff changeset
286 { char *a=first, *b=first+d, *c=first+2*d;
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diff changeset
287 #ifdef DEBUG_QSORT
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288 fprintf(stderr,"< %d %d %d\n",*(int*)a,*(int*)b,*(int*)c);
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289 #endif
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diff changeset
290 m1 = compare(a,b)<0 ?
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diff changeset
291 (compare(b,c)<0 ? b : (compare(a,c)<0 ? c : a))
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292 : (compare(a,c)<0 ? a : (compare(b,c)<0 ? c : b));
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293 }
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294 { char *a=mid-d, *b=mid, *c=mid+d;
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295 #ifdef DEBUG_QSORT
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diff changeset
296 fprintf(stderr,". %d %d %d\n",*(int*)a,*(int*)b,*(int*)c);
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diff changeset
297 #endif
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diff changeset
298 m2 = compare(a,b)<0 ?
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diff changeset
299 (compare(b,c)<0 ? b : (compare(a,c)<0 ? c : a))
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300 : (compare(a,c)<0 ? a : (compare(b,c)<0 ? c : b));
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301 }
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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302 { char *a=last-2*d, *b=last-d, *c=last;
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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diff changeset
303 #ifdef DEBUG_QSORT
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diff changeset
304 fprintf(stderr,"> %d %d %d\n",*(int*)a,*(int*)b,*(int*)c);
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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diff changeset
305 #endif
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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diff changeset
306 m3 = compare(a,b)<0 ?
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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diff changeset
307 (compare(b,c)<0 ? b : (compare(a,c)<0 ? c : a))
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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308 : (compare(a,c)<0 ? a : (compare(b,c)<0 ? c : b));
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309 }
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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diff changeset
310 #ifdef DEBUG_QSORT
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diff changeset
311 fprintf(stderr,"-> %d %d %d\n",*(int*)m1,*(int*)m2,*(int*)m3);
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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diff changeset
312 #endif
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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diff changeset
313 return compare(m1,m2)<0 ?
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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diff changeset
314 (compare(m2,m3)<0 ? m2 : (compare(m1,m3)<0 ? m3 : m1))
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diff changeset
315 : (compare(m1,m3)<0 ? m1 : (compare(m2,m3)<0 ? m3 : m2));
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316 }
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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diff changeset
317
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318 /* ---------------------------------------------------------------------- */
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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diff changeset
319
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diff changeset
320 static void qsort_nonaligned(void *base, size_t nmemb, size_t size,
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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diff changeset
321 int (*compare)(const void *, const void *)) {
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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diff changeset
322
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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diff changeset
323 stack_entry stack[STACK_SIZE];
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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diff changeset
324 int stacktop=0;
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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diff changeset
325 char *first,*last;
1337
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326 char *pivot=malloc(size);
1330
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diff changeset
327 size_t trunc=TRUNC_nonaligned*size;
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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diff changeset
328 assert(pivot!=0);
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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diff changeset
329
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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diff changeset
330 first=(char*)base; last=first+(nmemb-1)*size;
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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diff changeset
331
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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diff changeset
332 if ((size_t)(last-first)>trunc) {
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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diff changeset
333 char *ffirst=first, *llast=last;
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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diff changeset
334 while (1) {
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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diff changeset
335 /* Select pivot */
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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diff changeset
336 { char * mid=first+size*((last-first)/size >> 1);
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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diff changeset
337 Pivot(SWAP_nonaligned,size);
1337
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338 memcpy(pivot,mid,size);
1330
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diff changeset
339 }
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diff changeset
340 /* Partition. */
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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diff changeset
341 Partition(SWAP_nonaligned,size);
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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parents:
diff changeset
342 /* Prepare to recurse/iterate. */
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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diff changeset
343 Recurse(trunc)
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diff changeset
344 }
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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diff changeset
345 }
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
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diff changeset
346 PreInsertion(SWAP_nonaligned,TRUNC_nonaligned,size);
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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diff changeset
347 Insertion(SWAP_nonaligned);
1337
c687f06c7473 Don't touch code that we brought in from other sources
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348 free(pivot);
1330
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diff changeset
349 }
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350
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diff changeset
351 static void qsort_aligned(void *base, size_t nmemb, size_t size,
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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diff changeset
352 int (*compare)(const void *, const void *)) {
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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diff changeset
353
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
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diff changeset
354 stack_entry stack[STACK_SIZE];
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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diff changeset
355 int stacktop=0;
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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diff changeset
356 char *first,*last;
1337
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357 char *pivot=malloc(size);
1330
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diff changeset
358 size_t trunc=TRUNC_aligned*size;
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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diff changeset
359 assert(pivot!=0);
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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diff changeset
360
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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diff changeset
361 first=(char*)base; last=first+(nmemb-1)*size;
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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parents:
diff changeset
362
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
363 if ((size_t)(last-first)>trunc) {
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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parents:
diff changeset
364 char *ffirst=first,*llast=last;
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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parents:
diff changeset
365 while (1) {
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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parents:
diff changeset
366 /* Select pivot */
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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diff changeset
367 { char * mid=first+size*((last-first)/size >> 1);
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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parents:
diff changeset
368 Pivot(SWAP_aligned,size);
1337
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diff changeset
369 memcpy(pivot,mid,size);
1330
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diff changeset
370 }
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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diff changeset
371 /* Partition. */
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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parents:
diff changeset
372 Partition(SWAP_aligned,size);
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
373 /* Prepare to recurse/iterate. */
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
374 Recurse(trunc)
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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parents:
diff changeset
375 }
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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parents:
diff changeset
376 }
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
377 PreInsertion(SWAP_aligned,TRUNC_aligned,size);
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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parents:
diff changeset
378 Insertion(SWAP_aligned);
1337
c687f06c7473 Don't touch code that we brought in from other sources
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diff changeset
379 free(pivot);
1330
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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diff changeset
380 }
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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parents:
diff changeset
381
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
382 static void qsort_words(void *base, size_t nmemb,
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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parents:
diff changeset
383 int (*compare)(const void *, const void *)) {
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
384
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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parents:
diff changeset
385 stack_entry stack[STACK_SIZE];
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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parents:
diff changeset
386 int stacktop=0;
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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parents:
diff changeset
387 char *first,*last;
1337
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parents: 1336
diff changeset
388 char *pivot=malloc(WORD_BYTES);
1330
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
389 assert(pivot!=0);
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
390
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
391 first=(char*)base; last=first+(nmemb-1)*WORD_BYTES;
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
392
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
393 if (last-first>TRUNC_words) {
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
394 char *ffirst=first, *llast=last;
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
Sam Lantinga <slouken@libsdl.org>
parents:
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395 while (1) {
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396 #ifdef DEBUG_QSORT
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397 fprintf(stderr,"Doing %d:%d: ",
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398 (first-(char*)base)/WORD_BYTES,
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399 (last-(char*)base)/WORD_BYTES);
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400 #endif
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401 /* Select pivot */
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402 { char * mid=first+WORD_BYTES*((last-first) / (2*WORD_BYTES));
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403 Pivot(SWAP_words,WORD_BYTES);
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404 *(int*)pivot=*(int*)mid;
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405 }
450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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406 #ifdef DEBUG_QSORT
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407 fprintf(stderr,"pivot=%d\n",*(int*)pivot);
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408 #endif
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409 /* Partition. */
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410 Partition(SWAP_words,WORD_BYTES);
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411 /* Prepare to recurse/iterate. */
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412 Recurse(TRUNC_words)
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413 }
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414 }
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415 PreInsertion(SWAP_words,(TRUNC_words/WORD_BYTES),WORD_BYTES);
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416 /* Now do insertion sort. */
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417 last=((char*)base)+nmemb*WORD_BYTES;
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418 for (first=((char*)base)+WORD_BYTES;first!=last;first+=WORD_BYTES) {
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419 /* Find the right place for |first|. My apologies for var reuse */
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420 int *pl=(int*)(first-WORD_BYTES),*pr=(int*)first;
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421 *(int*)pivot=*(int*)first;
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422 for (;compare(pl,pivot)>0;pr=pl,--pl) {
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423 *pr=*pl; }
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424 if (pr!=(int*)first) *pr=*(int*)pivot;
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425 }
1337
c687f06c7473 Don't touch code that we brought in from other sources
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parents: 1336
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426 free(pivot);
1330
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427 }
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428
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429 /* ---------------------------------------------------------------------- */
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430
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431 void qsort(void *base, size_t nmemb, size_t size,
1330
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432 int (*compare)(const void *, const void *)) {
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433
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434 if (nmemb<=1) return;
1456
84de7511f79f Fixed a bunch of 64-bit compatibility problems
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parents: 1402
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435 if (((uintptr_t)base|size)&(WORD_BYTES-1))
1330
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436 qsort_nonaligned(base,nmemb,size,compare);
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437 else if (size!=WORD_BYTES)
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438 qsort_aligned(base,nmemb,size,compare);
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439 else
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440 qsort_words(base,nmemb,compare);
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441 }
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442
1331
1cbaeee565b1 A few fixes to get this building on Linux again
Sam Lantinga <slouken@libsdl.org>
parents: 1330
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443 #endif /* !HAVE_QSORT */