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qsort_r fallback implementation

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Martin Pulec
2025-05-23 07:59:38 +02:00
parent 7ba56fb8a1
commit 1effd49286
1 changed files with 35 additions and 3 deletions
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38
src/compat/qsort_s.h
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@@ -3,7 +3,7 @@
* @author Martin Pulec <pulec@cesnet.cz>
*/
/*
* Copyright (c) 2022-2023 CESNET z.s.p.o.
* Copyright (c) 2022-2025 CESNET
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
@@ -54,10 +54,10 @@
# define QSORT_S_COMP_FIRST 1 // MS version of qsort_s with comparator as first arg
# else
# ifdef __APPLE__
# define QSORT_S_COMP_FIRST 1 // BSD version of qsort_r() as well
# define QSORT_S_COMP_FIRST 1 // Mac version of qsort_r() as well
# define qsort_s(ptr, count, size, comp, context) qsort_r(ptr, count, size, context, comp)
# else
# define qsort_s qsort_r // GNU version
# define qsort_s qsort_r // POSIX/GNU version
# endif
# endif
#endif
@@ -68,5 +68,37 @@
#define QSORT_S_COMP_DEFINE(name, a, b, context) int name(const void *a, const void *b, void *context)
#endif
#ifdef __OpenBSD__
typedef int (*compar_r)(const void *, const void *, void *);
static int compar_impl(const void *a, const void *b) __attribute__((unused));
static int
compar_impl(const void *a, const void *b)
{
static _Thread_local compar_r comp = NULL;
static _Thread_local void *context = NULL;
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wcast-qual"
if (b == NULL) {
comp = (void *) a;
}
if (a == NULL) {
context = (void *) b;
}
#pragma GCC diagnostic pop
return comp(a, b, context);
}
static void qsort_r(void *base, size_t nmemb, size_t size,
int (*compar)(const void *, const void *, void *),
void *thunk) __attribute__((unused));
static void
qsort_r(void *base, size_t nmemb, size_t size,
int (*compar)(const void *, const void *, void *), void *thunk)
{
compar_impl(compar, NULL);
compar_impl(NULL, thunk);
return qsort(base, nmemb, size, compar_impl);
}
#endif
#endif // ! defined COMPAT_QSORT_S_H_81DF21DE_370E_4C70_8559_600C1A9B6059