dist/ntp/libisc/strerror.c

   1 /*      $NetBSD$        */
   2
   3 /*
   4  * Copyright (C) 2001  Internet Software Consortium.
   5  *
   6  * Permission to use, copy, modify, and distribute this software for any
   7  * purpose with or without fee is hereby granted, provided that the above
   8  * copyright notice and this permission notice appear in all copies.
   9  *
  10  * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM
  11  * DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL
  12  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL
  13  * INTERNET SOFTWARE CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT,
  14  * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING
  15  * FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
  16  * NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
  17  * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  18  */
  19
  20 /* Id: strerror.c,v 1.3 2001/11/20 01:45:45 gson Exp */
  21
  22 #include <config.h>
  23
  24 #include <stdio.h>
  25 #include <string.h>
  26
  27 #include <isc/mutex.h>
  28 #include <isc/once.h>
  29 #include <isc/print.h>
  30 #include <isc/strerror.h>
  31 #include <isc/util.h>
  32
  33 #ifdef HAVE_STRERROR
  34 /*
  35  * We need to do this this way for profiled locks.
  36  */
  37 static isc_mutex_t isc_strerror_lock;
  38 static void init_lock(void) {
  39         RUNTIME_CHECK(isc_mutex_init(&isc_strerror_lock) == ISC_R_SUCCESS);
  40 }
  41 #else
  42 extern const char * const sys_errlist[];
  43 extern const int sys_nerr;
  44 #endif
  45
  46 void
  47 isc__strerror(int num, char *buf, size_t size) {
  48 #ifdef HAVE_STRERROR
  49         char *msg;
  50         unsigned int unum = num;
  51         static isc_once_t once = ISC_ONCE_INIT;
  52
  53         REQUIRE(buf != NULL);
  54
  55         RUNTIME_CHECK(isc_once_do(&once, init_lock) == ISC_R_SUCCESS);
  56
  57         LOCK(&isc_strerror_lock);
  58         msg = strerror(num);
  59         if (msg != NULL)
  60                 snprintf(buf, size, "%s", msg);
  61         else
  62                 snprintf(buf, size, "Unknown error: %u", unum);
  63         UNLOCK(&isc_strerror_lock);
  64 #else
  65         unsigned int unum = num;
  66
  67         REQUIRE(buf != NULL);
  68
  69         if (num >= 0 && num < sys_nerr)
  70                 snprintf(buf, size, "%s", sys_errlist[num]);
  71         else
  72                 snprintf(buf, size, "Unknown error: %u", unum);
  73 #endif
  74 }