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/*
* Copyright (c) 2020, the SerenityOS developers.
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/Assertions.h>
#include <LibDl/dlfcn.h>
#include <LibDl/dlfcn_integration.h>
#include <pthread.h>
#include <regex.h>
static void* s_libregex;
static pthread_mutex_t s_libregex_lock;
static int (*s_regcomp)(regex_t*, char const*, int);
static int (*s_regexec)(regex_t const*, char const*, size_t, regmatch_t[], int);
static size_t (*s_regerror)(int, regex_t const*, char*, size_t);
static void (*s_regfree)(regex_t*);
static void ensure_libregex()
{
pthread_mutex_lock(&s_libregex_lock);
if (!s_libregex) {
s_libregex = __dlopen("libregex.so", RTLD_NOW).value();
s_regcomp = reinterpret_cast<int (*)(regex_t*, char const*, int)>(__dlsym(s_libregex, "regcomp").value());
s_regexec = reinterpret_cast<int (*)(regex_t const*, char const*, size_t, regmatch_t[], int)>(__dlsym(s_libregex, "regexec").value());
s_regerror = reinterpret_cast<size_t (*)(int, regex_t const*, char*, size_t)>(__dlsym(s_libregex, "regerror").value());
s_regfree = reinterpret_cast<void (*)(regex_t*)>(__dlsym(s_libregex, "regfree").value());
}
pthread_mutex_unlock(&s_libregex_lock);
}
extern "C" {
int __attribute__((weak)) regcomp(regex_t* reg, char const* pattern, int cflags)
{
ensure_libregex();
return s_regcomp(reg, pattern, cflags);
}
int __attribute__((weak)) regexec(regex_t const* reg, char const* string, size_t nmatch, regmatch_t pmatch[], int eflags)
{
ensure_libregex();
return s_regexec(reg, string, nmatch, pmatch, eflags);
}
size_t __attribute__((weak)) regerror(int errcode, regex_t const* reg, char* errbuf, size_t errbuf_size)
{
ensure_libregex();
return s_regerror(errcode, reg, errbuf, errbuf_size);
}
void __attribute__((weak)) regfree(regex_t* reg)
{
ensure_libregex();
return s_regfree(reg);
}
}
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