35 #if defined(LIBC_SCCS) && !defined(lint)
36 static char sccsid[] =
"@(#)qsort.c 8.1 (Berkeley) 6/4/93";
38 #include <sys/cdefs.h>
44 typedef int cmp_t(
const void *,
const void *,
void *);
45 static inline char *
med3(
char *,
char *,
char *,
cmp_t *,
void *);
46 static inline void swapfunc(
char *,
char *,
int,
int);
48 #define min(a, b) (a) < (b) ? a : b
53 #define swapcode(TYPE, parmi, parmj, n) { \
54 long i = (n) / sizeof (TYPE); \
55 TYPE *pi = (TYPE *) (parmi); \
56 TYPE *pj = (TYPE *) (parmj); \
64 #define SWAPINIT(a, es) swaptype = ((char *)a - (char *)0) % sizeof(long) || \
65 es % sizeof(long) ? 2 : es == sizeof(long)? 0 : 1;
79 if (swaptype == 0) { \
80 long t = *(long *)(a); \
81 *(long *)(a) = *(long *)(b); \
84 swapfunc(a, b, es, swaptype)
86 #define vecswap(a, b, n) if ((n) > 0) swapfunc(a, b, n, swaptype)
88 #define CMP(t, x, y) (cmp((x), (y), (t)))
91 med3(
char *a,
char *b,
char *c,
cmp_t *cmp,
void *thunk)
93 return CMP(thunk, a, b) < 0 ?
94 (
CMP(thunk, b, c) < 0 ? b : (
CMP(thunk, a, c) < 0 ? c : a ))
95 :(
CMP(thunk, b, c) > 0 ? b : (
CMP(thunk, a, c) < 0 ? a : c ));
101 char *pa, *pb, *pc, *pd, *pl, *pm, *pn;
104 int swaptype, swap_cnt;
109 for (pm = (
char *)a + es; pm < (
char *)a + n * es; pm += es)
111 pl > (
char *)a &&
CMP(thunk, pl - es, pl) > 0;
116 pm = (
char *)a + (n / 2) * es;
119 pn = (
char *)a + (n - 1) * es;
122 pl =
med3(pl, pl + d, pl + 2 * d, cmp, thunk);
123 pm =
med3(pm - d, pm, pm + d, cmp, thunk);
124 pn =
med3(pn - 2 * d, pn - d, pn, cmp, thunk);
126 pm =
med3(pl, pm, pn, cmp, thunk);
129 pa = pb = (
char *)a + es;
131 pc = pd = (
char *)a + (n - 1) * es;
133 while (pb <= pc && (cmp_result =
CMP(thunk, pb, a)) <= 0) {
134 if (cmp_result == 0) {
141 while (pb <= pc && (cmp_result =
CMP(thunk, pc, a)) >= 0) {
142 if (cmp_result == 0) {
157 for (pm = (
char *)a + es; pm < (
char *)a + n * es; pm += es)
159 pl > (
char *)a &&
CMP(thunk, pl - es, pl) > 0;
165 pn = (
char *)a + n * es;
166 r =
min(pa - (
char *)a, pb - pa);
168 r =
min(pd - pc, pn - pd - es);
170 if ((r = pb - pa) > es)
171 sat_sort(a, r / es, es, cmp, thunk);
172 if ((r = pd - pc) > es) {