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/*
* lib_strbuf.c - init_lib() and library string storage
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <isc/mutex.h>
#include <isc/net.h>
#include <isc/result.h>
#include "ntp_fp.h"
#include "ntp_stdlib.h"
#include "lib_strbuf.h"
#define LIB_NUMBUF 10
/*
* Storage declarations
*/
static char lib_stringbuf_storage[LIB_NUMBUF][LIB_BUFLENGTH];
static char * lib_stringbuf[LIB_NUMBUF];
int lib_inited;
static isc_mutex_t lib_mutex;
int ipv4_works;
int ipv6_works;
int debug;
/*
* initialization routine. Might be needed if the code is ROMized.
*/
void
init_lib(void)
{
u_int u;
if (lib_inited) {
return;
}
ipv4_works = (ISC_R_SUCCESS == isc_net_probeipv4());
ipv6_works = (ISC_R_SUCCESS == isc_net_probeipv6());
init_systime();
/*
* Avoid -Wrestrict warnings by keeping a pointer to each buffer
* so the compiler can see copying from one buffer to another is
* not violating restrict qualifiers on, e.g. memcpy() args.
*/
for (u = 0; u < COUNTOF(lib_stringbuf); u++) {
lib_stringbuf[u] = lib_stringbuf_storage[u];
}
isc_mutex_init(&lib_mutex);
lib_inited = TRUE;
}
char *
lib_getbuf(void)
{
static int lib_nextbuf;
int mybuf;
if (!lib_inited) {
init_lib();
}
isc_mutex_lock(&lib_mutex);
mybuf = lib_nextbuf;
lib_nextbuf = (1 + mybuf) % COUNTOF(lib_stringbuf);
isc_mutex_unlock(&lib_mutex);
zero_mem(lib_stringbuf[mybuf], LIB_BUFLENGTH);
return lib_stringbuf[mybuf];
}
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