qsort_r.h File Reference

Context-free sorting function. More...

#include <stddef.h>

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Typedefs
typedef int(*	qsort_r_compar_t) (const void *a, const void *b, void *arg)
	Prototype for generic comparison function, compatible with qsort_r() More...

Functions
void	mutt_qsort_r (void *base, size_t nmemb, size_t size, qsort_r_compar_t compar, void *arg)
	Sort an array, where the comparator has access to opaque data rather than requiring global variables. More...

Detailed Description

Context-free sorting function.

Authors

• Eric Blake

Copyright

This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 2 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program. If not, see http://www.gnu.org/licenses/.

Definition in file qsort_r.h.

Typedef Documentation

qsort_r_compar_t

typedef int(* qsort_r_compar_t) (const void *a, const void *b, void *arg)

Prototype for generic comparison function, compatible with qsort_r()

Parameters

a	First item
b	Second item
arg	Private data

Return values

<0	a precedes b
0	a and b are identical
>0	b precedes a

Definition at line 37 of file qsort_r.h.

Function Documentation

mutt_qsort_r()

void mutt_qsort_r	(	void *	base,
		size_t	nmemb,
		size_t	size,
		qsort_r_compar_t	compar,
		void *	arg
	)

Sort an array, where the comparator has access to opaque data rather than requiring global variables.

Parameters

base	Start of the array to be sorted
nmemb	Number of elements in the array
size	Size of each array element
compar	Comparison function, return <0/0/>0 to compare two elements
arg	Opaque argument to pass to compar

Note

This implementation might not be re-entrant: signal handlers and compar must not call mutt_qsort_r().

Definition at line 76 of file qsort_r.c.

{
#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
}

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