/*

 * 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];

}