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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#pragma once
#include <stdlib.h>
#include "macro.h"
/* This is the same as glibc's internal __compar_d_fn_t type. glibc exports a public comparison_fn_t, for the
* external type __compar_fn_t, but doesn't do anything similar for __compar_d_fn_t. Let's hence do that
* ourselves, picking a name that is obvious, but likely enough to not clash with glibc's choice of naming if
* they should ever add one. */
typedef int (*comparison_userdata_fn_t)(const void *, const void *, void *);
void *xbsearch_r(const void *key, const void *base, size_t nmemb, size_t size,
comparison_userdata_fn_t compar, void *arg);
#define typesafe_bsearch_r(k, b, n, func, userdata) \
({ \
const typeof((b)[0]) *_k = k; \
int (*_func_)(const typeof((b)[0])*, const typeof((b)[0])*, typeof(userdata)) = func; \
xbsearch_r((const void*) _k, (b), (n), sizeof((b)[0]), (comparison_userdata_fn_t) _func_, userdata); \
})
/**
* Normal bsearch requires base to be nonnull. Here were require
* that only if nmemb > 0.
*/
static inline void* bsearch_safe(const void *key, const void *base,
size_t nmemb, size_t size, comparison_fn_t compar) {
if (nmemb <= 0)
return NULL;
assert(base);
return bsearch(key, base, nmemb, size, compar);
}
#define typesafe_bsearch(k, b, n, func) \
({ \
const typeof((b)[0]) *_k = k; \
int (*_func_)(const typeof((b)[0])*, const typeof((b)[0])*) = func; \
bsearch_safe((const void*) _k, (b), (n), sizeof((b)[0]), (comparison_fn_t) _func_); \
})
/**
* Normal qsort requires base to be nonnull. Here were require
* that only if nmemb > 0.
*/
static inline void _qsort_safe(void *base, size_t nmemb, size_t size, comparison_fn_t compar) {
if (nmemb <= 1)
return;
assert(base);
qsort(base, nmemb, size, compar);
}
/* A wrapper around the above, but that adds typesafety: the element size is automatically derived from the type and so
* is the prototype for the comparison function */
#define typesafe_qsort(p, n, func) \
({ \
int (*_func_)(const typeof((p)[0])*, const typeof((p)[0])*) = func; \
_qsort_safe((p), (n), sizeof((p)[0]), (comparison_fn_t) _func_); \
})
static inline void qsort_r_safe(void *base, size_t nmemb, size_t size, comparison_userdata_fn_t compar, void *userdata) {
if (nmemb <= 1)
return;
assert(base);
qsort_r(base, nmemb, size, compar, userdata);
}
#define typesafe_qsort_r(p, n, func, userdata) \
({ \
int (*_func_)(const typeof((p)[0])*, const typeof((p)[0])*, typeof(userdata)) = func; \
qsort_r_safe((p), (n), sizeof((p)[0]), (comparison_userdata_fn_t) _func_, userdata); \
})
int cmp_int(const int *a, const int *b);
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