qsort_r.c

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