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author | Sebastian Bergmann <sebastian@php.net> | 2001-09-19 10:25:04 +0000 |
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committer | Sebastian Bergmann <sebastian@php.net> | 2001-09-19 10:25:04 +0000 |
commit | 3bdddb4910ae344a1f9f18dee864e7ff682a4c9d (patch) | |
tree | 1cf32324a160246d3744f5461d94d2b57296d211 /Zend/zend_qsort.c | |
parent | da5a79d18526b6def1afc861044bd482f4b7e4ee (diff) | |
download | php-git-3bdddb4910ae344a1f9f18dee864e7ff682a4c9d.tar.gz |
MFZE1
Diffstat (limited to 'Zend/zend_qsort.c')
-rw-r--r-- | Zend/zend_qsort.c | 106 |
1 files changed, 106 insertions, 0 deletions
diff --git a/Zend/zend_qsort.c b/Zend/zend_qsort.c new file mode 100644 index 0000000000..63056584cb --- /dev/null +++ b/Zend/zend_qsort.c @@ -0,0 +1,106 @@ +/* + +----------------------------------------------------------------------+ + | Zend Engine | + +----------------------------------------------------------------------+ + | Copyright (c) 1998-2001 Zend Technologies Ltd. (http://www.zend.com) | + +----------------------------------------------------------------------+ + | This source file is subject to version 0.92 of the Zend license, | + | that is bundled with this package in the file LICENSE, and is | + | available at through the world-wide-web at | + | http://www.zend.com/license/0_92.txt. | + | If you did not receive a copy of the Zend license and are unable to | + | obtain it through the world-wide-web, please send a note to | + | license@zend.com so we can mail you a copy immediately. | + +----------------------------------------------------------------------+ + | Authors: Sterling Hughes <sterling@php.net> | + +----------------------------------------------------------------------+ +*/ + +#include "zend.h" + +#include <limits.h> + +#define QSORT_STACK_SIZE (sizeof(size_t) * CHAR_BIT) + +static void _zend_qsort_swap(void *a, void *b, size_t siz) +{ + register size_t i; + register int t_i; + register char t_c; + + for (i = sizeof(int); i <= siz; i += sizeof(int)) { + t_i = *(int *) a; + *((int *) a)++ = *(int *) b; + *((int *) b)++ = t_i; + } + + for (i = i - sizeof(int) + 1; i <= siz; ++i) { + t_c = *(char *) a; + *((char *) a)++ = *(char *) b; + *((char *) b)++ = t_c; + } +} + +ZEND_API void zend_qsort(void *base, size_t nmemb, size_t siz, compare_func_t compare TSRMLS_DC) +{ + void *begin_stack[QSORT_STACK_SIZE]; + void *end_stack[QSORT_STACK_SIZE]; + register char *begin; + register char *end; + register char *seg1; + register char *seg2; + register char *seg2p; + register int loop; + uint offset; + + begin_stack[0] = (char *) base; + end_stack[0] = (char *) base + ((nmemb - 1) * siz); + + for (loop = 0; loop >= 0; --loop) { + begin = begin_stack[loop]; + end = end_stack[loop]; + + while (begin < end) { + offset = (end - begin) >> 1; + _zend_qsort_swap(begin, begin + (offset - (offset % siz)), siz); + + seg1 = begin + siz; + seg2 = end; + + while (1) { + for (; seg1 < seg2 && compare(begin, seg1 TSRMLS_CC) > 0; + seg1 += siz); + + for (; seg2 >= seg1 && compare(seg2, begin TSRMLS_CC) > 0; + seg2 -= siz); + + if (seg1 >= seg2) + break; + + _zend_qsort_swap(seg1, seg2, siz); + + seg1 += siz; + seg2 -= siz; + } + + _zend_qsort_swap(begin, seg2, siz); + + seg2p = seg2; + + if ((seg2p - begin) <= (end - seg2p)) { + if ((seg2p + siz) < end) { + begin_stack[loop] = seg2p + siz; + end_stack[loop++] = end; + } + end = seg2p - siz; + } + else { + if ((seg2p - siz) > begin) { + begin_stack[loop] = begin; + end_stack[loop++] = seg2p - siz; + } + begin = seg2p + siz; + } + } + } +} |