qsort_r.c

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#include "config.h"
#include <stddef.h>
#include <stdlib.h>
#include "mutt/lib.h" // IWYU pragma: keep
#include "qsort_r.h"
 
#if !defined(HAVE_QSORT_S) && !defined(HAVE_QSORT_R)
static sort_t GlobalCompar = NULL;
static void *GlobalData = NULL;
 
static int relay_compar(const void *a, const void *b)
{
  return GlobalCompar(a, b, GlobalData);
}
#endif
 
void mutt_qsort_r(void *base, size_t nmemb, size_t size, sort_t compar, void *sdata)
{
#ifdef HAVE_QSORT_S
  /* FreeBSD 13, where qsort_r had incompatible signature but qsort_s works */
  qsort_s(base, nmemb, size, compar, sdata);
#elif defined(HAVE_QSORT_R)
  /* glibc, POSIX (https://www.austingroupbugs.net/view.php?id=900) */
  qsort_r(base, nmemb, size, compar, sdata);
#else
  /* This fallback is not re-entrant. */
  ASSERT(!GlobalCompar && !GlobalData);
  GlobalCompar = compar;
  GlobalData = sdata;
  qsort(base, nmemb, size, relay_compar);
  GlobalCompar = NULL;
  GlobalData = NULL;
#endif
}